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  • 1. Andreyev, A. N.
    et al.
    Ackermann, D.
    Cagarda, P.
    Gerl, J.
    Hessberger, F. P.
    Hofmann, S.
    Huyse, M.
    Keenan, A.
    Kettunen, H.
    Kleinbohl, A.
    Lavrentiev, A.
    Leino, M.
    Lommel, B.
    Matos, M.
    Munzenberg, G.
    Moore, C. J.
    O'Leary, C. D.
    Page, R. D.
    Reshitko, S.
    Saro, S.
    Schlegel, C.
    Shaffner, H.
    Taylor, M. J.
    Van Duppen, P.
    Weissman, L.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    New microsecond isomers in Bi-189,Bi-1902001In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 10, no 2, p. 129-133Article in journal (Refereed)
    Abstract [en]

    New microsecond isomers in the neutron-deficient isotopes Bi-189g,Bi-190 have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil-gamma /X-ray, recoil-gamma /X-ray-alpha and excitation function measurements. The systematics of the [pi 1i(13/2)]13/2(+) excited states in the odd-mass Bi nuclei is discussed.

  • 2. Axelsson, A
    et al.
    Nyberg, J
    Atac, A
    Bergstrom, M H
    Herskind, B
    de Angelis, G
    Back, T
    Bazzacco, D
    Bracco, A
    Camera, F
    Cederwall, B
    Fahlander, C
    Huijnen, J H
    Lunardi, S
    Million, B
    Napoli, D R
    Persson, J
    Piiparinen, M
    Alvarez, C R
    Sletten, G
    Varmette, P G
    Weiszflog, M
    Excited superdeformed band in Eu-1431999In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 6, no 2, p. 175-183Article in journal (Refereed)
    Abstract [en]

    A new superdeformed band has been discovered in a EUROBALL experiment and assigned to Eu-143. It has a maximum intensity of 35% of the Eu-143 yrast superdeformed band and the transition energies of the two bands are very similar. Based on comparison with cranked shell model calculations the new band is tentatively assigned the high-N intruder configuration pi 6(2)nu 7(0) and the parity and signature quantum numbers (pi, alpha) = (-1, +1/2). In addition to the already known high-energy transition at 3361 keV another discrete line at 2715 keV was found to be in coincidence with the yrast superdeformed band. However, it was not possible to connect the decay out of either of the superdeformed bands to, known normally deformed states.

  • 3.
    Bhagwat, A.
    et al.
    UM DAE Ctr Excellence Basic Sci, Mumbai 400098, Maharashtra, India.;AlbaNova Univ Ctr, Dept Nucl Phys, KTH Royal Inst Technol, S-10691 Stockholm, Sweden..
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Cluster emission from superheavy nuclei2018In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 11, article id 200Article in journal (Refereed)
    Abstract [en]

    The process leading to cluster emission from superheavy nuclei in the range 100 122 has been systematically investigated. This topic is of importance because it opens up the possibility of identifying superheavy elements through deposition of clusters in the detection system. In this paper we evaluate the cluster decay half lives by considering the cluster as a particle. The motion of this particle in the field induced by the daughter nucleus is determined by solving the corresponding Schrodinger equation imposing outgoing boundary conditions (Gamow state). The corresponding Wood-Saxon potential is fitted to obtain the energies provided by a mass formula that has been established recently to have a very high degree of precision. The resulting expression for the decay width is exact, i.e. no approximation besides the assumption of a preformed cluster is introduced. It is found that the heavy cluster emission probability in the superheavy region is much smaller than the corresponding a emission probability.

  • 4.
    Bäck, Torbjörn
    et al.
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Lagergren, Karin
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Greenlees, P
    Jenkins, D
    Jones, P
    Joss, T
    Julin, R
    Juutinen, S
    Keenan, A
    Kettunen, H
    Kuusiniemi, P
    Leino, M
    Leppanen, P
    Muikku, M
    Nieminen, P
    Pakarinen, J
    Rahkila, P
    Uusitalo, J
    Spectroscopy of the neutron-deficient nuclide Pt-1712003In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 17, no 1, p. 1-5Article in journal (Refereed)
    Abstract [en]

    A number of previously unobserved gamma-rays emitted from the neutron-deficient nuclide Pt-171 have been identified using the recoil decay tagging technique. The level scheme has been updated using information from gamma-gamma coincidences and angular distribution measurements. To further confirm the assignments of the gamma-rays to Pt-171, the events were correlated with the alpha-decay of the daughter nucleus Os-167.

  • 5.
    Bäck, Torbjörn
    et al.
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Lagergren, Karin
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Karlgren, Daniel
    KTH, Superseded Departments, Physics.
    Greenlees, P
    Jenkins, D
    Jones, P
    Joss, T
    Julin, R
    Juutinen, S
    Keenan, A
    Kettunen, H
    Kuusiniemi, P
    Leino, M
    Leppanen, P
    Muikku, M
    Nieminen, P
    Pakarinen, J
    Rahkila, P
    Uusitalo, J
    First observation of gamma-rays from the proton emitter Au-1712003In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 16, no 4, p. 489-494Article in journal (Refereed)
    Abstract [en]

    Gamma-rays from the alpha- and proton-unstable nuclide Au-171 have been observed for the first time. The gamma-rays were correlated with both a proton- and an alpha-particle decay branch, confirming that the nucleus decays by alpha and proton emission from a single (11/2(-)) state. The measurement confirms the previously determined half-lives for these particle decays but the present values are of higher precision. In addition, a longer half-life than determined in previous work was measured for the proton-unstable tentative ground state. The results are discussed in relation to structures in neighbouring nuclei and compared with a Strutinsky-type TRS calculation.

  • 6.
    Bäck, Torbjörn
    et al.
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Cederkäll, Joakim
    KTH, Superseded Departments, Physics.
    Devlin, M
    Elson, J
    LaFosse, R
    Lerma, F
    Sarantites, G
    Clark, M
    Fallon, P
    Lee, Y
    Macchiavelli, O
    Macleod, W
    Observation of superdeformed states in Mo-881999In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 6, no 4, p. 391-397Article in journal (Refereed)
    Abstract [en]

    High-spin states in Mo-88 were studied using the GAMMASPHERE germanium detector array in conjunction with the MICROBALL CsI(TI) charged-particle detector system. Three gamma-ray cascades with dynamic moments of inertia showing similar characteristics to superdeformed rotational bands observed in the neighbouring A = 80 region have been identified and assigned to the nucleus Mo-88. The quadrupole moment of the strongest band, deduced by the Residual Doppler Shift Method, corresponds to a quadrupole deformation of beta(2) approximate to 0.6. This confirms the superdeformed nature of this band. The experimental data are interpreted in the framework of total routhian surface calculations. All three hands are assigned to two-quasi-particle proton configurations at superdeformed shape.

  • 7.
    Cederwall, Bo
    et al.
    KTH, Superseded Departments, Physics.
    Bäck, Torbjörn
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Cederkäll, Joakim
    KTH, Superseded Departments, Physics.
    Devlin, M
    Elson, J
    LaFosse, R
    Lerma, F
    Sarantites, G
    Clark, M
    Fallon, P
    Lee, Y
    Macchiavelli, O
    Macleod, W
    Favoured superdeformed states in 89TC1999In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 6, no 3, p. 251-255Article in journal (Refereed)
    Abstract [en]

    A superdeformed band consisting of a cascade of ten gamma-ray transitions has been identified and assigned to the nucleus Tc-89, close to the proton dripline. The quadrupole moment of the band (Q(t) = 6.7(-2.3)(+3.0) eb, as measured by the Residual Doppler Shift Method) as well as a large dynamic moment of inertia point to a highly elongated shape. With a relative population of approximately 15% of the gamma-ray flux in the Tc-89 exit channel, thp band is among the most intense superdeformed bands observed to date.

  • 8. Collaboration, The PANDA
    et al.
    Singh, B.
    Erni, W.
    Krusche, B.
    Steinacher, M.
    Walford, N.
    Liu, B.
    Liu, H.
    Liu, Z.
    Shen, X.
    Wang, C.
    Zhao, J.
    Albrecht, M.
    Erlen, T.
    Fink, M.
    Heinsius, F.
    Held, T.
    Holtmann, T.
    Jasper, S.
    Keshk, I.
    Koch, H.
    Kopf, B.
    Kuhlmann, M.
    Kümmel, M.
    Leiber, S.
    Mikirtychyants, M.
    Musiol, P.
    Mustafa, A.
    Pelizäus, M.
    Pychy, J.
    Richter, M.
    Schnier, C.
    Schröder, T.
    Sowa, C.
    Steinke, M.
    Triffterer, T.
    Wiedner, U.
    Ball, M.
    Beck, R.
    Hammann, C.
    Ketzer, B.
    Kube, M.
    Mahlberg, P.
    Rossbach, M.
    Schmidt, C.
    Schmitz, R.
    Thoma, U.
    Urban, M.
    Walther, D.
    Wendel, C.
    Wilson, A.
    Bianconi, A.
    Bragadireanu, M.
    Caprini, M.
    Pantea, D.
    Patel, B.
    Czyzycki, W.
    Domagala, M.
    Filo, G.
    Jaworowski, J.
    Krawczyk, M.
    Lisowski, F.
    Lisowski, E.
    Michałek, M.
    Poznański, P.
    Płażek, J.
    Korcyl, K.
    Kozela, A.
    Kulessa, P.
    Lebiedowicz, P.
    Pysz, K.
    Schäfer, W.
    Szczurek, A.
    Fiutowski, T.
    Idzik, M.
    Mindur, B.
    Przyborowski, D.
    Swientek, K.
    Biernat, J.
    Kamys, B.
    Kistryn, S.
    Korcyl, G.
    Krzemien, W.
    Magiera, A.
    Moskal, P.
    Pyszniak, A.
    Rudy, Z.
    Salabura, P.
    Smyrski, J.
    Strzempek, P.
    Wronska, A.
    Augustin, I.
    Böhm, R.
    Lehmann, I.
    Nicmorus Marinescu, D.
    Schmitt, L.
    Varentsov, V.
    Al-Turany, M.
    Belias, A.
    Deppe, H.
    Dzhygadlo, R.
    Ehret, A.
    Flemming, H.
    Gerhardt, A.
    Götzen, K.
    Gromliuk, A.
    Gruber, L.
    Karabowicz, R.
    Kliemt, R.
    Krebs, M.
    Kurilla, U.
    Lehmann, D.
    Löchner, S.
    Lühning, J.
    Lynen, U.
    Orth, H.
    Patsyuk, M.
    Peters, K.
    Saito, T.
    Schepers, G.
    Schmidt, C. J.
    Schwarz, C.
    Schwiening, J.
    Täschner, A.
    Traxler, M.
    Ugur, C.
    Voss, B.
    Wieczorek, P.
    Wilms, A.
    Zühlsdorf, M.
    Abazov, V.
    Alexeev, G.
    Arefiev, V. A.
    Astakhov, V.
    Barabanov, M. Y.
    Batyunya, B. V.
    Davydov, Y.
    Dodokhov, V. K.
    Efremov, A.
    Fechtchenko, A.
    Fedunov, A. G.
    Galoyan, A.
    Grigoryan, S.
    Koshurnikov, E. K.
    Lobanov, Y. Y.
    Lobanov, V. I.
    Makarov, A. F.
    Malinina, L. V.
    Malyshev, V.
    Olshevskiy, A. G.
    Perevalova, E.
    Piskun, A. A.
    Pocheptsov, T.
    Pontecorvo, G.
    Rodionov, V.
    Rogov, Y.
    Salmin, R.
    Samartsev, A.
    Sapozhnikov, M. G.
    Shabratova, G.
    Skachkov, N. B.
    Skachkova, A. N.
    Strokovsky, E. A.
    Suleimanov, M.
    Teshev, R.
    Tokmenin, V.
    Uzhinsky, V.
    Vodopianov, A.
    Zaporozhets, S. A.
    Zhuravlev, N. I.
    Zorin, A. G.
    Branford, D.
    Glazier, D.
    Watts, D.
    Böhm, M.
    Britting, A.
    Eyrich, W.
    Lehmann, A.
    Pfaffinger, M.
    Uhlig, F.
    Dobbs, S.
    Seth, K.
    Tomaradze, A.
    Xiao, T.
    Bettoni, D.
    Carassiti, V.
    Cotta Ramusino, A.
    Dalpiaz, P.
    Drago, A.
    Fioravanti, E.
    Garzia, I.
    Savrie, M.
    Akishina, V.
    Kisel, I.
    Kozlov, G.
    Pugach, M.
    Zyzak, M.
    Gianotti, P.
    Guaraldo, C.
    Lucherini, V.
    Bersani, A.
    Bracco, G.
    Macri, M.
    Parodi, R. F.
    Biguenko, K.
    Brinkmann, K.
    Di Pietro, V.
    Diehl, S.
    Dormenev, V.
    Drexler, P.
    Düren, M.
    Etzelmüller, E.
    Galuska, M.
    Gutz, E.
    Hahn, C.
    Hayrapetyan, A.
    Kesselkaul, M.
    Kühn, W.
    Kuske, T.
    Lange, J. S.
    Liang, Y.
    Metag, V.
    Nanova, M.
    Nazarenko, S.
    Novotny, R.
    Quagli, T.
    Reiter, S.
    Rieke, J.
    Rosenbaum, C.
    Schmidt, M.
    Schnell, R.
    Stenzel, H.
    Thöring, U.
    Ullrich, M.
    Wagner, M. N.
    Wasem, T.
    Wohlfahrt, B.
    Zaunick, H.
    Ireland, D.
    Rosner, G.
    Seitz, B.
    Deepak, P. N.
    Kulkarni, A.
    Apostolou, A.
    Babai, M.
    Kavatsyuk, M.
    Lemmens, P. J.
    Lindemulder, M.
    Loehner, H.
    Messchendorp, J.
    Schakel, P.
    Smit, H.
    Tiemens, M.
    van der Weele, J. C.
    Veenstra, R.
    Vejdani, S.
    Dutta, K.
    Kalita, K.
    Kumar, A.
    Roy, A.
    Sohlbach, H.
    Bai, M.
    Bianchi, L.
    Büscher, M.
    Cao, L.
    Cebulla, A.
    Dosdall, R.
    Gillitzer, A.
    Goldenbaum, F.
    Grunwald, D.
    Herten, A.
    Hu, Q.
    Kemmerling, G.
    Kleines, H.
    Lehrach, A.
    Nellen, R.
    Ohm, H.
    Orfanitski, S.
    Prasuhn, D.
    Prencipe, E.
    Pütz, J.
    Ritman, J.
    Schadmand, S.
    Sefzick, T.
    Serdyuk, V.
    Sterzenbach, G.
    Stockmanns, T.
    Wintz, P.
    Wüstner, P.
    Xu, H.
    Zambanini, A.
    Li, S.
    Li, Z.
    Sun, Z.
    Rigato, V.
    Isaksson, L.
    Achenbach, P.
    Corell, O.
    Denig, A.
    Distler, M.
    Hoek, M.
    Karavdina, A.
    Lauth, W.
    Merkel, H.
    Müller, U.
    Pochodzalla, J.
    Sanchez, S.
    Schlimme, S.
    Sfienti, C.
    Thiel, M.
    Ahmadi, H.
    Ahmed, S.
    Bleser, S.
    Capozza, L.
    Cardinali, M.
    Dbeyssi, A.
    Deiseroth, M.
    Feldbauer, F.
    Fritsch, M.
    Fröhlich, B.
    Jasinski, P.
    Kang, D.
    Khaneft, D.
    Klasen, R.
    Leithoff, H. H.
    Lin, D.
    Maas, F.
    Maldaner, S.
    Martínez, M.
    Michel, M.
    Mora Espí, M. C.
    Morales Morales, C.
    Motzko, C.
    Nerling, F.
    Noll, O.
    Pflüger, S.
    Pitka, A.
    Rodríguez Piñeiro, D.
    Sanchez-Lorente, A.
    Steinen, M.
    Valente, R.
    Weber, T.
    Zambrana, M.
    Zimmermann, I.
    Fedorov, A.
    Korjik, M.
    Missevitch, O.
    Boukharov, A.
    Malyshev, O.
    Marishev, I.
    Balanutsa, V.
    Balanutsa, P.
    Chernetsky, V.
    Demekhin, A.
    Dolgolenko, A.
    Fedorets, P.
    Gerasimov, A.
    Goryachev, V.
    Chandratre, V.
    Datar, V.
    Dutta, D.
    Jha, V.
    Kumawat, H.
    Mohanty, A. K.
    Parmar, A.
    Roy, B.
    Sonika, G.
    Fritzsch, C.
    Grieser, S.
    Hergemöller, A.
    Hetz, B.
    Hüsken, N.
    Khoukaz, A.
    Wessels, J. P.
    Khosonthongkee, K.
    Kobdaj, C.
    Limphirat, A.
    Srisawad, P.
    Yan, Y.
    Barnyakov, M.
    Barnyakov, A. Y.
    Beloborodov, K.
    Blinov, A. E.
    Blinov, V. E.
    Bobrovnikov, V. S.
    Kononov, S.
    Kravchenko, E. A.
    Kuyanov, I. A.
    Martin, K.
    Onuchin, A. P.
    Serednyakov, S.
    Sokolov, A.
    Tikhonov, Y.
    Atomssa, E.
    Kunne, R.
    Marchand, D.
    Ramstein, B.
    van de Wiele, J.
    Wang, Y.
    Boca, G.
    Costanza, S.
    Genova, P.
    Montagna, P.
    Rotondi, A.
    Abramov, V.
    Belikov, N.
    Bukreeva, S.
    Davidenko, A.
    Derevschikov, A.
    Goncharenko, Y.
    Grishin, V.
    Kachanov, V.
    Kormilitsin, V.
    Levin, A.
    Melnik, Y.
    Minaev, N.
    Mochalov, V.
    Morozov, D.
    Nogach, L.
    Poslavskiy, S.
    Ryazantsev, A.
    Ryzhikov, S.
    Semenov, P.
    Shein, I.
    Uzunian, A.
    Vasiliev, A.
    Yakutin, A.
    Tomasi-Gustafsson, E.
    Roy, U.
    Yabsley, B.
    Belostotski, S.
    Gavrilov, G.
    Izotov, A.
    Manaenkov, S.
    Miklukho, O.
    Veretennikov, D.
    Zhdanov, A.
    Makonyi, K.
    Preston, M.
    Tegner, P.
    Wölbing, D.
    Bäck, T.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Rai, A. K.
    Godre, S.
    Calvo, D.
    Coli, S.
    De Remigis, P.
    Filippi, A.
    Giraudo, G.
    Lusso, S.
    Mazza, G.
    Mignone, M.
    Rivetti, A.
    Wheadon, R.
    Balestra, F.
    Iazzi, F.
    Introzzi, R.
    Lavagno, A.
    Olave, J.
    Amoroso, A.
    Bussa, M. P.
    Busso, L.
    De Mori, F.
    Destefanis, M.
    Fava, L.
    Ferrero, L.
    Greco, M.
    Hu, J.
    Lavezzi, L.
    Maggiora, M.
    Maniscalco, G.
    Marcello, S.
    Sosio, S.
    Spataro, S.
    Birsa, R.
    Bradamante, F.
    Bressan, A.
    Martin, A.
    Calen, H.
    Ikegami Andersson, W.
    Johansson, T.
    Kupsc, A.
    Marciniewski, P.
    Papenbrock, M.
    Pettersson, J.
    Schönning, K.
    Wolke, M.
    Galnander, B.
    Diaz, J.
    Pothodi Chackara, V.
    Chlopik, A.
    Kesik, G.
    Melnychuk, D.
    Slowinski, B.
    Trzcinski, A.
    Wojciechowski, M.
    Wronka, S.
    Zwieglinski, B.
    Bühler, P.
    Marton, J.
    Steinschaden, D.
    Suzuki, K.
    Widmann, E.
    Zmeskal, J.
    Feasibility studies of time-like proton electromagnetic form factors at P ¯ ANDA at FAIR2016In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 10, article id 325Article in journal (Refereed)
    Abstract [en]

    Simulation results for future measurements of electromagnetic proton form factors at P ¯ ANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel p¯ p→ e+e- is studied on the basis of two different but consistent procedures. The suppression of the main background channel, i.e.p¯ p→ π+π-, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance.

  • 9.
    Doncel, Maria
    et al.
    KTH, School of Engineering Sciences (SCI), Physics. Universidad de Salamanca, Spain; University of Liverpool, United Kingdom.
    Gadea, A.
    Valiente-Dobon, J. J.
    Quintana, B.
    Modamio, V.
    Mengoni, D.
    Moller, O.
    Dewald, A.
    Pietralla, N.
    Determination of lifetimes of nuclear excited states using the Recoil Distance Doppler Shift Method in combination with magnetic spectrometers2017In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 53, no 10, article id 211Article in journal (Refereed)
    Abstract [en]

    The current work presents the determination of lifetimes of nuclear excited states using the Recoil Distance Doppler Shift Method, in combination with spectrometers for ion identification, normalizing the intensity of the peaks by the ions detected in the spectrometer as a valid technique that produces results comparable to the ones obtained by the conventional shifted-to-unsifted peak ratio method. The technique has been validated using data measured with the gamma-ray array AGATA, the PRISMA spectrometer and the Cologne plunger setup. In this paper a test performed with the AGATA-PRISMA setup at LNL and the advantages of this new approach with respect to the conventional Recoil Distance Doppler Shift Method are discussed.

  • 10. Erni, L.
    et al.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    et, al,
    Technical design report for the PANDA (AntiProton Annihilations at Darmstadt) Straw Tube Tracker2013In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 49, no 2Article in journal (Refereed)
    Abstract [en]

    This document describes the technical layout and the expected performance of the Straw Tube Tracker (STT), the main tracking detector of the PANDA target spectrometer. The STT encloses a Micro-Vertex-Detector (MVD) for the inner tracking and is followed in beam direction by a set of GEM stations. The tasks of the STT are the measurement of the particle momentum from the reconstructed trajectory and the measurement of the specific energy loss for a particle identification. Dedicated simulations with full analysis studies of certain proton-antiproton reactions, identified as being benchmark tests for the whole PANDA scientific program, have been performed to test the STT layout and performance. The results are presented, and the time lines to construct the STT are described.

  • 11.
    Ertoprak, Aysegul
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doncel, Maria
    KTH, School of Engineering Sciences (SCI), Physics.
    Jakobsson, U.
    Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden.;Univ Helsinki, Dept Chem, POB 3, FIN-00014 Helsinki, Finland..
    Nyako, B. M.
    MTA Atomki, H-4001 Debrecen, Hungary..
    Jaworski, G.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Davies, P.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    de France, G.
    CEA DSM CNRS IN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 5, France..
    Kuti, I.
    MTA Atomki, H-4001 Debrecen, Hungary..
    Napoli, D. R.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Wadsworth, R.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    Ghugre, S. S.
    UGC DAE Consortium Sci Res, Kolkata Ctr, Kolkata 700098, India..
    Raut, R.
    UGC DAE Consortium Sci Res, Kolkata Ctr, Kolkata 700098, India..
    Akkus, B.
    Istanbul Univ, Fac Sci, Dept Phys, TR-34134 Istanbul, Turkey..
    Al Azri, H.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    Algora, A.
    MTA Atomki, H-4001 Debrecen, Hungary.;Univ Valencia, CSIC, Inst Fis Corpuscular, E-46980 Valencia, Spain..
    de Angelis, G.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Atac Nyberg, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden..
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Boso, A.
    Univ Padua, Dipartimento Fis & Astron, Padua, Italy..
    Clement, E.
    CEA DSM CNRS IN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 5, France..
    Debenham, D. M.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
    Dombradi, Zs.
    MTA Atomki, H-4001 Debrecen, Hungary..
    Erturk, S.
    Nigde Omer Halisdemir Univ, Sci & Art Fac, Dept Phys, TR-51200 Nigde, Turkey..
    Gadea, A.
    Univ Valencia, CSIC, Inst Fis Corpuscular, E-46980 Valencia, Spain..
    Moradi, F. Ghazi
    Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden..
    Gottardo, A.
    Univ Paris Saclay, CNRS IN2P3, Ctr Sci Nucl & Sci Mat, F-91405 Orsay, France..
    Huyuk, T.
    Univ Valencia, CSIC, Inst Fis Corpuscular, E-46980 Valencia, Spain..
    Ideguchi, E.
    Osaka Univ, Nucl Phys Res Ctr, Osaka, Japan..
    Li, H.
    Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden..
    Michelagnoli, C.
    CEA DSM CNRS IN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 5, France..
    Modamio, V.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Nyberg, J.
    Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden..
    Palacz, M.
    Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland..
    Petrache, C. M.
    Univ Paris Saclay, CNRS IN2P3, Ctr Sci Nucl & Sci Mat, F-91405 Orsay, France..
    Recchia, F.
    Univ Padua, Dipartimento Fis & Astron, Padua, Italy..
    Sandzelius, M.
    Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland..
    Siciliano, M.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Timar, J.
    MTA Atomki, H-4001 Debrecen, Hungary..
    Valiente-Dobon, J. J.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Xiao, Z. G.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    M1 and E2 transition rates from core-excited states in semi-magic Ru-942018In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 9, article id 145Article in journal (Refereed)
    Abstract [en]

    Lifetimes of high-spin states have been measured in the semi-magic (N = 50) nucleus Ru-94. Excited states in Ru-94 were populated in the Ni-58(Ca-40, 4p)Ru-94* fusion-evaporation reaction at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from gamma-rays emitted while the residual nuclei were slowing down in a thick 6 mg/cm(2) metallic Ni-58 target. In total eight excited-state lifetimes in the angular momentum range I = (13-20)h have been measured, five of which were determined for the first time. The corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.

  • 12. Glowacz, S.
    et al.
    Satula, Wojtek
    KTH, Superseded Departments, Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Cranking in isospace2004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 19, no 1, p. 33-44Article in journal (Refereed)
    Abstract [en]

    The response of isovector and isoscalar pair fields to generalized rotation in isospace is studied. Analytical expressions for constant gap solutions for different limiting cases of the model are derived. In particular, the connections between gauge angles among pairing gaps and the position of the iso-cranking axis are investigated in N = Z nuclei. The two domains of collective and noncollective rotation in space are generalized to isospace. The amplitudes for pair-transfer of T = 0 and T = 1 pairs are calculated. It is shown that the structure of the T = 0 state in odd-odd nuclei prevents any enhancement of pair transfer also in the presence of strong isoscalar pairing correlations. The energy differences of the T = 0 and T = 1 excitations in odd-odd nuclei are qualitatively reproduced by Total-Routhian-Surface calculations.

  • 13. Gono, Y.
    et al.
    Odahara, A.
    Fukuchi, T.
    Ideguchi, E.
    Kishida, T.
    Kubo, T.
    Watanabe, H.
    Motomura, S.
    Saito, K.
    Kashiyama, O.
    Morikawa, T.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Zhang, Y. H.
    Zhou, X. H.
    Ishihara, M.
    Sagawa, H.
    Systematics of high-spin isomers in N=83 isotones and a high-spin isomer beam2002In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 13, no 02-jan, p. 5-8Article in journal (Refereed)
    Abstract [en]

    Isomers in N = 83 isotones of Z = 60 66 were studied systematically. Their spins and parities arc,49/2(+) and 27(+) for odd and odd-odd nuclei, respectively. Nearly constant excitation energies of these isomers indicated a decrease of a Z = 64 shell gap energy as Z decreases from 64 to 60 within the framework of a deformed independent-particle model (DIPM). Their configurations are [v(f(tau/2)h(9/2)i(13/2)), pi(h(11/2))(2)](49/2+) and [v(f(7/2)h(9/2)i(13/2)), pi(h(11/2))(2)(d(5/2))(-1)](27+) for odd and odd-odd nuclei, respectively. The shape of the yrast status changes suddenly at spin 49/2(odd) and 27(odd-odd) from a near spherical to an oblate shape. Transitions from isomers are highly hindered because of the shape changes. They may be categorized to be shape isomers. The development of a secondary beam produced by using these high-spin isomers is also described.

  • 14. Hueyuek, Tayfun
    et al.
    Di Nitto, Antonio
    Jaworski, Grzegorz
    Gadea, Andres
    Valiente-Dobon, Jose Javier
    Nyberg, Johan
    Palacz, Marcin
    Soederstroem, Paer-Anders
    Jose Aliaga-Varea, Ramon
    de Angelis, Giacomo
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Collado, Javier
    Domingo-Pardo, Cesar
    Egea, Francisco Javier
    Erduran, Nizamettin
    Ertuerk, Sefa
    de France, Gilles
    Gadea, Rafael
    Gonzalez, Vicente
    Herrero-Bosch, Vicente
    Kaskas, Ayse
    Modamio, Victor
    Moszynski, Marek
    Sanchis, Enrique
    Triossi, Andrea
    Wadsworth, Robert
    Conceptual design of the early implementation of the NEutron Detector Array (NEDA) with AGATA2016In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 3, article id 55Article in journal (Refereed)
    Abstract [en]

    The NEutron Detector Array (NEDA) project aims at the construction of a new high-efficiency compact neutron detector array to be coupled with large gamma-ray arrays such as AGATA. The application of NEDA ranges from its use as selective neutron multiplicity filter for fusion-evaporation reaction to a large solid angle neutron tagging device. In the present work, possible configurations for the NEDA coupled with the Neutron Wall for the early implementation with AGATA has been simulated, using Monte Carlo techniques, in order to evaluate their performance figures. The goal of this early NEDA implementation is to improve, with respect to previous instruments, efficiency and capability to select multiplicity for fusion-evaporation reaction channels in which 1, 2 or 3 neutrons are emitted. Each NEDA detector unit has the shape of a regular hexagonal prism with a volume of about 3.23 l and it is filled with the EJ301 liquid scintillator, that presents good neutron-gamma discrimination properties. The simulations have been performed using a fusion-evaporation event generator that has been validated with a set of experimental data obtained in the Ni-58 + Fe-56 reaction measured with the Neutron Wall detector array.

  • 15. Ideguchi, E
    et al.
    Niikura, M
    Ishida, C
    Fukuchi, T
    Baba, H
    Hokoiwa, N
    Iwasaki, H
    Koike, T
    Komatsubara, T
    Kubo, T
    Kurokawa, M
    Michimasa, S
    Miyakawa, K
    Morimoto, K
    Ohnishi, T
    Ota, S
    Ozawa, A
    Shimoura, S
    Suda, T
    Tarnaki, M
    Tanihata, I
    Wakabayashi, Y
    Yoshida, K
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Study of high-spin states in the Ca-48 region by using secondary fusion reactions2005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 25, p. 429-430Article in journal (Refereed)
    Abstract [en]

    An in-beam gamma-ray spectroscopy study, following a fusion reaction induced by a neutronrich secondary beam, Ar-46 + Be-9, is presented. A low-energy secondary beam of Ar-46 at similar to 5 MeV/A was developed in order to induce fusion reactions. Gamma-gamma coincidence and excitation function analysis was performed to study high-spin states in the vicinity of Ca-48, Ti49-52.

  • 16.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Nuclear structure in the vicinity of the N = Z line in the A=90-100 region2002In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 13, no 02-jan, p. 9-14Article in journal (Refereed)
    Abstract [en]

    Neutron-deficient nuclei in the mass region A approximate to 90-100 exhibit a large variety of phenomena. In this region the heaviest N = Z nuclei are identified and enhanced neutron-proton correlations are expected when protons and neutrons occupy identical orbitals. A variety of nuclear shapes are predicted and observed for A less than or equal to 91, including superdeformed shapes. The nucleus Sn-100 is the heaviest N = Z doubly magic nucleus believed to be bound. Knowledge of the shell structure around 100Sn is of utmost importance for understanding the nuclear shell model. New results on both the N = Z nucleus Ru-88, superdeformed structures in A approximate to 90 nuclei as well as the first result on the level structure in Sn-103, and an extended level structure in In-102 are presented. The limitations of using stable beams and targets and the possibilities with new radioactive beams are briefly outlined.

  • 17.
    Klamra, Wlodzimierz
    et al.
    KTH, Superseded Departments, Physics.
    Asztalos, S.
    Becker, J. A.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Clark, R. M.
    Deleplanque, M. A.
    Diamond, R. M.
    Fallon, P.
    Farris, L. P.
    Lee, I. Y.
    Macchiavelli, A. O.
    Macleod, R. W.
    Sarantites, D. G.
    Stephens, F. S.
    High-spin multiparticle-hole excitations in Eu-1482001In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 10, no 1, p. 11-12Article in journal (Refereed)
    Abstract [en]

    Studies by means of 155 MeV Al-27 bombardment on a Te-130 target revealed in Eu-148 high-spin structures up to spin 31 (n) over tilde, in addition to a cascade extended to the 11088.1 keV excitation. The observed levels are tentatively assigned as complex multiparticle-hole proton and neutron configurations.

  • 18.
    Lagergren, K
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Blomqvist, J.
    Sohler, D.
    de Angelis, G.
    Bednarczyk, P.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics.
    Claesson, T.
    KTH, School of Engineering Sciences (SCI), Physics.
    Dorvaux, O.
    Farnea, E.
    Gadea, A.
    Gorska, M.
    Milechina, Larissa
    KTH, School of Engineering Sciences (SCI), Physics.
    Norlin, L. O.
    KTH, School of Engineering Sciences (SCI), Physics.
    Odahara, A.
    Palacz, M.
    Stefanescu, I.
    Thelen, O.
    Vivien, J. P.
    Evidence for excited states in Ag-952002In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 14, no 4, p. 393-396Article in journal (Refereed)
    Abstract [en]

    The first evidence for excited states in Ag-95 is presented. Ag-95 is the heaviest T-z = 1/2 nucleus for which gamma-rays have been identified. The reaction Ca-40(Ni-58, 1p2n)Ag-95 was used in the experiment, which resulted in the assignment of three gamma-rays to Ag-95. A detector system consisting of the detector arrays Euroball, Neutron Wall and Euclides was used to detect gamma-rays, neutrons and charged particles, respectively.

  • 19.
    Lagergren, Karin
    et al.
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Experimental evidence for tunneling in the decay of superdeformed states2004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 21, no 2, p. 175-177Article in journal (Refereed)
    Abstract [en]

    A systematic study of the depopulation of superdeformed rotational bands in neutron-deficient A approximate to 80-90 nuclei has been performed. We observed a correlation between the rotational frequency at which the decay out of the superdeformed bands takes place and the difference between the transition quadrupole moments of states in the superdeformed bands and high-lying states with normal deformation. The observation may constitute direct experimental evidence that the commonly adopted tunneling picture for the decay of superdeformed states is valid.

  • 20.
    Lagergren, Karin
    et al.
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Clark, R. M.
    Fallon, P.
    Gorgen, A.
    Issa, Tomas
    KTH, Superseded Departments, Physics.
    Janssens, R. V. F.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Macchiavelli, A. O.
    Milechina, Larissa
    KTH, Superseded Departments, Physics.
    Sarantites, D. G.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Isospectral superdeformed bands in the N=46 nuclei Mo-88 and Tc-892004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 21, no 3, p. 375-381Article in journal (Refereed)
    Abstract [en]

    Superdeformed bands in Mo-88 and Tc-89 were populated Using Ca-40-induced fusion-evaporation reactions on Ni-58 at a beam energy of 185 MeV. Gamma-rays emitted in the reactions were detected using the Gammasphere spectrometer, in coincidence with charged particles detected by the Microball array. A new superdeformed band was assigned to the nucleus Mo-88, leading to a revisit of earlier configuration assignments for superdeformed structures in this nucleus. In particular, the theoretical interpretation of a pair of identical (isospectral) superdeformed bands in Mo-88/Tc-89 is discussed. The configurations that are assigned to the four SD bands belonging to Mo-88 have properties that are predicted to be significantly affected by pair correlations.

  • 21.
    Li, Hongjie
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Xiao, Z. G.
    Zhu, S. J.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Yeoh, E. Y.
    Zhang, Z.
    Wang, R. S.
    Yi, H.
    Yan, W. H.
    Xu, Q.
    Wu, X. G.
    He, C. Y.
    Zheng, Y.
    Li, G. S.
    Li, C. B.
    Li, H. W.
    Liu, J. J.
    Hu, S. P.
    Wang, J. L.
    Yao, S. H.
    Reinvestigation of the collective band structures in odd-odd Pm-138 nucleus2015In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 51, no 5, article id 60Article in journal (Refereed)
    Abstract [en]

    The high-spin states in the odd-odd Pm-138 nucleus have been reinvestigated via the Te-124(F-19, 5n) reaction at the beam energy of 103MeV. Most of the known transitions and levels are confirmed. A number of bands are revised and one new band has been established. For the yrast pi h(11/2) circle times nu h(11/2) band based on 8(+) state, no evidence supporting the occurence of signature inversion is found. The experimental and theoretical B(M1)/B(E2) ratios have been calculated for band (2), which support the pi g(7/2)[413]5/2(+) circle times nu h(11/2)[514]9/2(-) Nilsson configuration assignment. Four bands with Delta I = 2 transitions are tentatively assigned as doubly decoupled bands. The other three bands are proposed as oblate-triaxial bands. The possible configuration assignments for these bands are also discussed under the calculations of total Routhian surface and particle-rotor model.

  • 22. Lieder, R. M.
    et al.
    Pasternak, A. A.
    Podsvirova, E. O.
    Efimov, A. D.
    Mikhajlov, V. M.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Venkova, T.
    Gast, W.
    Jager, H. M.
    Mihailescu, L.
    Bazzacco, D.
    Lunardi, S.
    Menegazzo, R.
    Alvarez, C. R.
    de Angelis, G.
    Napoli, D. R.
    Rzaca-Urban, T.
    Urban, W.
    Dewald, A.
    Investigations of the level scheme of Gd-144 and lifetimes in the quadrupole bands2004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 21, no 1, p. 37-55Article in journal (Refereed)
    Abstract [en]

    For a level scheme investigation of Gd-144 an experiment with the gamma-spectrometer EUROBALL III has been carried out and lifetimes have been measured with the gamma-spectrometer GASP using the Doppler-shift attenuation method. The high-spin states have been populated in these experiments by means of the Mo-100(Ti-48,4n) reaction at 215 MeV and the Cd-114(S-36,6n) reaction at E = 182 MeV, respectively. The known quadrupole band has been modified and a new one has been established. Reduced E2 transition probabilities B(E2) were determined for seven members of these quadrupole bands. They show values between approximate to60 and 130 W.u. and this considerable enhancement gives evidence for a significant nuclear deformation. A (pih(11/2))(2) circle times (vh(11/2))(-2) configuration may be assigned to one of the quadrupole bands according to total Routhian surface calculations. The spin dependence of the B(E2) values has been explained by IBM calculations involving high-spin quasiparticle excitations.

  • 23. Lieder, R. M.
    et al.
    Rzaca-Urban, T.
    Brands, H.
    Gast, W.
    Jager, H. M.
    Mihailescu, L.
    Marcinkowska, Z.
    Urban, W.
    Morek, T.
    Droste, C.
    Szymanski, P.
    Chmel, S.
    Bazzacco, D.
    Falconi, G.
    Menegazzo, R.
    Lunardi, S.
    Alvarez, C. R.
    de Angelis, G.
    Farnea, E.
    Gadea, A.
    Napoli, D. R.
    Podolyak, Z.
    Venkova, T.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Development of magnetic rotation in light Gd nuclei; study of Gd-1422002In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 13, no 3, p. 297-305Article in journal (Refereed)
    Abstract [en]

    High-spin states in Gd-142 have been populated by means of the Ru-99(Ti-48, 2p3n) reaction at 2-10 MeV and investigated with the gamma-spectrometer EUROBALL III and the charged-particle detector array ISIS. The features of four dipole bands have been determined and compared with tilted-axis cranking model calculations indicating that they are magnetic rotational bands. A transition from regular to irregular bands has been found approaching N = 82 demonstrating that this is a general phenomenon in nuclei near a double-shell closure.

  • 24. Liu, H. L.
    et al.
    Xu, F. R.
    Sun, Y.
    Walker, P. M.
    Wyss, Ramon A.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    On the stability of high- K isomers in the second well of actinide nuclei2011In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 47, no 11, p. 135-Article in journal (Refereed)
    Abstract [en]

    Actinide nuclei are found to be good candidates for the formation of high angular momentum, broken-pair excitations in the second minimum of the potential-energy surface. Configuration-constrained calculations of the energy surfaces, including reflection asymmetry, give predictions of the properties of high-K states in the second well. In addition to excitation energies, spins and parities, the calculations indicate increased barriers towards fission, consistent with the extended half-lives observed experimentally.

  • 25. Mabala, G. K.
    et al.
    Gueorguieva, E.
    Sharpey-Schafer, J. F.
    Benatar, M.
    Fearick, R. W.
    Korir, K. I.
    Lawrie, J. J.
    Mullins, S. M.
    Murray, S. H. T.
    Ncapayi, N. J.
    Newman, R. T.
    Roux, D. G.
    Smit, F. D.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Shears band with a large dynamic moment of inertia in Bi-1972005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 25, no 1, p. 49-55Article in journal (Refereed)
    Abstract [en]

    High-spin states in Bi-197 were studied with the AFRODITE gamma-ray array at iThemba LABS using the Ta-181(Ne-22, 6n) reaction at a beam energy of 125 MeV. A new shears band was found and linked to the low-lying states in Bi-197. Its dynamic moment of inertia, F (2), is considerably larger than the ((2)) of the shears bands in the neighbouring Pb isotopes. This is probably a result of the involvement of an additional high-K h(9/2) proton orbital.

  • 26.
    Satula, Wojtek
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Rafalski, M.
    Cranking in isospace - Applications to neutron-proton pairing and the nuclear symmetry energy2005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 25, no SUPPL. 1, p. 559-562Article in journal (Refereed)
    Abstract [en]

    Isoscalar pairing interaction and nuclear symmetry energy are investigated by means of the iso-cranking technique. Iso-cranking represents the lowest order approximation to isospin projection after variation. Due to its internal simplicity, it offers a very intuitive understanding of the structure of the nuclear symmetry energy as well as the response of the isoscalar and isovector pairing versus isospin.

  • 27.
    Satula, Wojtek
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zdunczuk, H.
    Using high-spin data to constrain spin-orbit term and spin-fields of Skyrme forces - The need to unify the tune-odd part of the local energy density functional2005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 25, no Suppl. 1, p. 551-552Article in journal (Refereed)
    Abstract [en]

    A method to study spin-fields and the spin-orbit potential within the local energy density approach is presented. The concept utilizes the intrinsic simplicity of terminating states in order to constrain certain parameters of the local nuclear energy functional. In particular, constraints on the isoscalar Landau parameter go and the strength of the spin-orbit potential are thoroughly discussed.

  • 28. Singh, B. P.
    et al.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Semenov-Tian-Shansky, T.
    et al.,
    Experimental access to Transition Distribution Amplitudes with the PANDA experiment at FAIR2015In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 51, no 8, article id 107Article in journal (Refereed)
    Abstract [en]

    Baryon-to-meson Transition Distribution Amplitudes (TDAs) encoding valuable new information on hadron structure appear as building blocks in the collinear factorized description for several types of hard exclusive reactions. In this paper, we address the possibility of accessing nucleon-to-pion (pi N) TDAs from (p) over barp -> e(+)e(-)pi(0) reaction with the future PANDA detector at the FAIR facility. At high center-of-mass energy and high invariant mass squared of the lepton pair q(2), the amplitude of the signal channel (p) over barp -> e(+)e(-)pi(0) admits a QCD factorized description in terms of pi N TDAs and nucleon Distribution Amplitudes (DAs) in the forward aid backward kinematic regimes. Assuming the validity of this factorized description, we perform feasibility studies for measuring (p) over barp -> e(+)e(-)pi(0) with the PANDA detector. Detailed simulations on signal reconstruction efficiency as well as on rejection of the most severe background channel, i.e. (p) over barp -> pi(+)pi(-)pi(0) were performed for the center-of-mass energy squared s = 5 GeV2 and s = 10 GeV2, in the kinematic regions 3.0 < q(2) < 4.3 GeV2 and 5 < q(2) < 9 GeV2, respectively, with a neutral pion scattered in the forward or backward cone vertical bar cos theta(pi 0)vertical bar > 0.5 in the proton-antiproton center-of-mass frame. Results of the simulation show that the particle identification capabilities of the PANDA detector will allow to achieve a background rejection factor of 5 . 10(7) (1 . 10(7)) at low (high) q(2) for s = 5 GeV2, and of 1 . 10(8) (6 . 10(6)) at low (high) q(2) for s = 10 GeV2, while keeping the signal reconstruction efficiency at around 40%. At both energies, a clean lepton signal can be reconstructed with the expected statistics corresponding to 2 of integrated luminosity. The cross sections obtained from the simulations are used to show that a test of QCD collinear factorization can be done at the lowest order by measuring scaling laws and angular distributions. The future measurement of the signal channel cross section with PANDA will provide a new test of the perturbative QCD description of a novel class of hard exclusive reactions and will open the possibility of experimentally accessing pi N TDAs.

  • 29. Sohler, D
    et al.
    Cederkall, J
    Dombradi, Z
    Persson, J
    Cederwall, Bo
    Johnson, A
    Norlin, L O
    Weiszflog, M
    Atac, A
    Blomquist, J
    Bark, R A
    Kerek, A
    Klamra, W
    Kownacki, J
    Lipoglavsek, M
    Mitarai, S
    Nyberg, J
    Roth, H A
    Sletten, G
    Spectroscopy of neutron deficient Te-1081998In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 3, no 3, p. 209-211Article in journal (Refereed)
    Abstract [en]

    The neutron deficient nucleus Te-108 was studied in the Fe-54(Ni-58,2p2n) reaction. A detector system consisting of 4 Euroball cluster detectors, a charged-particle detector ball and a 16 element neutron multiplicity filter was used to detect the emitted particles and gamma rays. A new, significantly extended level scheme was constructed on the basis of gamma gamma-coincidence relations. Spin values for the states were determined from angular distribution ratios. The experimental results are discussed in terms of the shell model.

  • 30. Sohler, D.
    et al.
    Dombradi, Z.
    Blomqvist, J.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Kerek, A.
    Klamra, Wlodzimierz
    KTH, Superseded Departments, Physics.
    Norlin, L. O.
    Nyberg, J.
    et al,
    Maximally aligned states in Ag-992003In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 16, no 2, p. 171-175Article in journal (Refereed)
    Abstract [en]

    Excited states of Ag-99 were populated via the Cr-50 + Ni-58 (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron. detector systems for reaction channel separation. On the basis of the measured gammagamma-coincidence relations and angular distribution ratios a significantly extended level scheme has been constructed up to E-x similar to 7.8 MeV and I = 35/2. The experimental results were described within the framework of the shell model. Candidates for states fully aligned in the pig(9/2)(-3)nu(d(5/2),g(7/2))(2) valence configuration space were found at 4109 and 6265 keV.

  • 31. Sohler, Dola
    et al.
    Lagergren, Karin
    KTH, Superseded Departments, Physics.
    Blomqvist, Jan
    KTH, Superseded Departments, Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Hadinia, Baharak
    KTH, Superseded Departments, Physics.
    Milechina, Larissa
    KTH, Superseded Departments, Physics.
    Timaar, J.
    de Angelis, G.
    Bednarczyk, P.
    Curien, D.
    Gadea, A.
    Nyberg, J.
    First identification of excited states in the T-z=1/2 nucleus Pd-932004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 19, no 2, p. 169-172Article in journal (Refereed)
    Abstract [en]

    The first experimental information about excited states in the N=Z+1 nucleus Pd-93 is presented. The experiment was performed using a 205 MeV Ni-58 beam from the Vivitron accelerator at IReS, Strasbourg, impinging on a bismuth-backed Ca-40 target. Gamma-rays, neutrons and charged particles emitted in the reactions were detected using the Ge detector array Euroball, the Neutron Wall liquid-scintillator array and the Euclides Si charged-particle detector system. The experimental level scheme is compared with the results of new shell model calculations which predict a coupling scheme with aligned neutron-proton pairs to greatly influence the level structure of Napproximate toZ nuclei at low excitation energies.

  • 32. Stanoiu, M.
    et al.
    Azaiez, F.
    Becker, F.
    Belleguic, M.
    Borcea, C.
    Bourgeois, C.
    Brown, B. A.
    Dlouhy, Z.
    Dombradi, Z.
    Fulop, Z.
    Grawe, H.
    Grevy, S.
    Ibrahim, F.
    Kerek, Andras
    KTH, Superseded Departments, Physics.
    Krasznahorkay, A.
    Lewitowicz, M.
    Lukyanov, S.
    van der Marel, Hans
    KTH, Superseded Departments, Physics.
    Mayet, P.
    Mrazek, J.
    Mandal, S.
    Guillemaud-Mueller, D.
    Negoita, F.
    Penionzhkevich, Y. E.
    Podolyak, Z.
    Roussel-Chomaz, P.
    Saint Laurent, M. G.
    Savajols, H.
    Sorlin, O.
    Sletten, G.
    Sohler, D.
    Timar, J.
    Timis, C.
    Yamamoto, A.
    Study of drip line nuclei through two-step fragmentation2004In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 20, no 1, p. 95-96Article in journal (Refereed)
    Abstract [en]

    We have studied the structure of light neutron-rich nuclei around N = 16 by employing the in-beam gamma-ray spectroscopy technique using the fragmentation of secondary beams of Ne-25,Ne-26, Na-27,Na-28 and Mg-29,Mg-30 isotopes. This secondary-beam cocktail was obtained by the fragmentation of a 36 S beam at 77.5 MeV.A by the SISSI/GANIL facility. By a second-step fragmentation, we have measured gamma-ray-residue coincidences in C17-20 and O-23,O-24 and described the obtained levels in the framework of the shell model.

  • 33. Stefanova, E. A.
    et al.
    Lieb, K. P.
    Stefanescu, I.
    De Angelis, G.
    Curien, D.
    Eberth, J.
    Farnea, E.
    Gadea, A.
    Gersch, G.
    Jungclaus, A.
    Martinez, T.
    Schwengner, R.
    Steinhardt, T.
    Warr, N.
    Weisshaar, D.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Observation of negative-parity high-spin states of As-682005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 24, no 1, p. 1-4Article in journal (Refereed)
    Abstract [en]

    The neutron-deficient nucleus As-68 was populated at high spin in two experiments using the reaction Ca-40(S-32, 3pn) at beam energies of 105 and 95 MeV. A self-supporting and a gold-backed, highly enriched Ca-40 target were used. Gamma rays were detected with the EUROBALL array, combined with the charged-particle detector array EUCLIDES and the Neutron Wall. The As-68 level scheme was considerably extended, especially at negative parity and many previous spin-parity assignments were confirmed or rejected. The total-Routhian-surface (TRS) calculations find shape coexistence and γ softness for the negative- and positive-parity states, respectively.

  • 34. Suleimanov, V. F.
    et al.
    Poutanen, Juri
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. University of Turku, Finland.
    Klochkov, D.
    Werner, K.
    Measuring the basic parameters of neutron stars using model atmospheres2016In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 2, article id 20Article in journal (Refereed)
    Abstract [en]

    Model spectra of neutron star atmospheres are nowadays widely used to fit the observed thermal X-ray spectra of neutron stars. This fitting is the key element in the method of the neutron star radius determination. Here, we present the basic assumptions used for the neutron star atmosphere modeling as well as the main qualitative features of the stellar atmospheres leading to the deviations of the emergent model spectrum from blackbody. We describe the properties of two of our model atmosphere grids: i) pure carbon atmospheres for relatively cool neutron stars (1-4MK) and ii) hot atmospheres with Compton scattering taken into account. The results obtained by applying these grids to model the X-ray spectra of the central compact object in supernova remnant HESS 1731-347, and two X-ray bursting neutron stars in low-mass X-ray binaries, 4U 1724-307 and 4U 1608-52, are presented. Possible systematic uncertainties associated with the obtained neutron star radii are discussed.

  • 35. Van de Vel, K.
    et al.
    Andreyev, A. N.
    Ackermann, D.
    Boardman, H. J.
    Cagarda, P.
    Gerl, J.
    Hessberger, F. P.
    Hofmann, S.
    Huyse, M.
    Karlgren, Daniel
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Kojouharov, I.
    Leino, M.
    Lommel, B.
    Munzenberg, G.
    Moore, C.
    Page, R. D.
    Saro, S.
    Van Duppen, P.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Prolate structures in Po-189 and Pb-1852005In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 24, no 1, p. 57-62Article in journal (Refereed)
    Abstract [en]

    The 3/2(-) isomer in Pb-185 and states above it have been populated in the α-decay of Po-189. The observed α-decay strengths to and the electromagnetic decay properties of the excited states in Pb-185 have been combined with Potential Energy Surface and Particle-Plus-Rotor calculations to propose configuration assignments. It is suggested that the α-decaying isomer of Po-189 is of prolate origin and that the prolate configuration becomes very low in energy in Pb-185.

  • 36. Van De Vel, K.
    et al.
    Andreyev, A. N.
    Page, R. D.
    Kettunen, H.
    Greenlees, P. T.
    Jones, P.
    Julin, R.
    Juutinen, S.
    Kankaanpaa, H.
    Keenan, A.
    Kuusiniemi, P.
    Leino, M.
    Muikku, M.
    Nieminen, P.
    Rahkila, P.
    Uusitalo, J.
    Eskola, K.
    Hurstel, A.
    Huyse, M.
    Le Coz, Y.
    Smith, M. B.
    Van Duppen, P.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    In-beam gamma-ray spectroscopy of Po-190: First observation of a low-lying prolate band in Po isotopes2003In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 17, no 2, p. 167-171Article in journal (Refereed)
    Abstract [en]

    Gamma rays from excited states of Po-190 have been observed using I the Jurosphere Ge-detector array coupled to the RITU gas-filled separator. They were associated with a collective band which from spin 4h onwards resembles the prolate rotational bands known in the isotones Pb-188 and Hg-186. This indicates that in Po-190 the prolate configuration becomes yrast above I = 2h. The experimental results are interpreted in a two-band mixing calculation and are in agreement with a-decay data and potential energy surface calculations.

  • 37. Weiszflog, M.
    et al.
    de Angelis, G.
    Axelsson, A.
    Bazzacco, D.
    Becker, F.
    De Poli, M.
    Eberth, J.
    Fahlander, C.
    Gadea, A.
    Lunardi, S.
    Napoli, D. R.
    Nyberg, J.
    Alvarez, C. R.
    Rubio, B.
    Rudolph, D.
    Skoda, S.
    Thomas, H. G.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    High-spin spectroscopy of Ga-63(31)32 and Ga-65(31)342001In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 11, no 1, p. 25-38Article in journal (Refereed)
    Abstract [en]

    High-spin states in the nuclei Ga-63 and Ga-65 were studied following the reaction S-32 + Ca-40 at a reaction energy of 125 MeV and using the GASP gamma -ray spectrometer in combination with the ISIS charged-particle detector system. In addition to low-lying negative-parity states with single-particle character, rotational-like cascades built on the 9/2(+) and 19/2(-) states have been observed in both nuclei. Sidebands with negative parity in Ga-63 and positive parity in Ga-65 could be established. The experimental results are compared with Total Routhian Surface calculations which describe the nuclei as moderately deformed (beta (2) approximate to 0.25) and gamma soft at low rotational frequencies. The highest experimentally observed positive-parity state in Ga-65 (41/2(+)) is in good agreement with the calculated crossing of the collective band with a non-collective one terminating at this spin.

  • 38. Wiseman, D. R.
    et al.
    Andreyev, A. N.
    Page, R. D.
    Smith, M. B.
    Darby, I. G.
    Eeckhaudt, S.
    Grahn, T.
    Greenlees, P. T.
    Jones, P.
    Julin, R.
    Juutinen, S.
    Kettunen, H.
    Leino, M.
    Leppaenen, A. -P
    Nyman, M.
    Pakarinen, J.
    Rahkila, P.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics.
    Saren, J.
    Scholey, C.
    Uusitalo, J.
    In-beam gamma-ray spectroscopy of Po-190,Po-1972007In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 34, no 3, p. 275-281Article in journal (Refereed)
    Abstract [en]

    gamma-ray transitions in the neutron-deficient nuclei Po-190,Po-197 have been identified using the JUROGAM Ge detector array coupled to the RITU gas-filled separator and the GREAT spectrometer. The yrast band of Po-190 has been firmly established through gamma-gamma coincidences and extended up to a spin and parity of 14(+). It displays similar behaviour to its isotones Hg-186 and Pb-188 above the 4(+) level, thus confirming its prolate nature. In Po-197 the band built upon the 13/2(+) isomer has been extended up to a spin and parity of 33/2(+), while the non-yrast band has been observed for the first time. The behaviour of Po-197 is found to be similar to that of the nearby even-mass isotopes, which is consistent with the model in which the i(13/2) neutron is weakly coupled to the states in the even-even core.

  • 39.
    Xu, Q.
    et al.
    TaiYuan Univ Technol, Coll Phys & Optoelect, Taiyuan 030024, Shanxi, Peoples R China..
    Xiao, Z. G.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Zhu, S. J.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Qi, C.
    KTH, School of Engineering Sciences (SCI), Physics.
    Jia, H.
    Qi, B.
    Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China..
    Wang, R. S.
    Soochow Univ, Coll Med, Sch Radiat Med & Protect, Renai Rd 199, Suzhou 215123, Peoples R China.;Jiangsu Higher Educ Inst, Collaborat Innovat Ctr Radiol Med, Renai Rd 199, Suzhou 215123, Peoples R China..
    Cheng, W. J.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Zhang, Y.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Yi, H.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Lu, L. M.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Wang, Y. J.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Li, H. J.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Huang, Y.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Zhang, Z.
    Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China..
    Wu, X. G.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Li, C. B.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Zheng, Y.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Chen, Q. M.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Zhou, W. K.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Li, G. S.
    China Inst Atom Energy, Beijing 102413, Peoples R China..
    Investigation of high spin states in Cs-1332018In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 5, article id 83Article in journal (Refereed)
    Abstract [en]

    High spin states in Cs-133 nucleus have been studied with the reaction Te-130 (Li-7, 4n) at a beam energy of 38 MeV. The level scheme has been expanded with spin up to 31/2 (h) over bar. Compared with a recent paper, ground state band and other two collective band structures at lower spin states have been confirmed. Another collective band structure at higher spin states as well as some levels and transitions are updated. Compared with the experimental data, large-scale shell model and tilted axis cranking model calculations have been carried out. The results show that the band-head configuration of yrast band based on 7/2(+) ground state and the side band built on the 5/2(+) state are a pair of pseudospin partner states with pi (f) over tilde 7/2,5/2. The negative parity band based on 1071.5 keV level originates from pi h(11/2) orbital. Another band built on 2642.9 keV level at high spin states has been proposed with oblate deformation. Other characteristics for these bands were also discussed.

  • 40. Zalewski, M.
    et al.
    Satula, Wojtek
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Dobaczewski, J.
    Olbratowski, P.
    Rafalski, M.
    Werner, T. R.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Shell structure fingerprints of tensor interaction2009In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 42, no 3, p. 577-581Article in journal (Refereed)
    Abstract [en]

    We address the consequences of strong tensor terms in the local energy density functional, resulting from fits to the f(5/2)-f(7/2) splittings in Ca-40, Ca-48, and Ni-56. In this study, we focus on the tensor contribution to the nuclear binding energy. In particular, we show that it exhibits an interesting topological feature closely resembling that of the shell correction. We demonstrate that in the extreme single-particle scenario at spherical shape, the tensor contribution shows tensorial magic numbers equal to N(Z) = 14, 32, 56, and 90, and that this structure is smeared out due to configuration mixing caused by pairing correlations and migration of proton/neutron sub-shells with neutron/proton shell filling. Based on a specific Skyrme-type functional SLy4(T), we show that the proton tensorial magic numbers shift with increasing neutron excess to Z = 14, 28, and 50.

1 - 40 of 40
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