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  • 1. Andreyev, A. N.
    et al.
    Ackermann, D.
    Hessberger, F. P.
    Heyde, K.
    Hofmann, S.
    Huyse, M.
    Karlgren, Daniel
    KTH, Superseded Departments, Physics.
    Kojouharov, I.
    Kindler, B.
    Lommel, B.
    Munzenberg, G.
    Page, R. D.
    de Vel, K. V.
    Van Duppen, P.
    Walters, W. B.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Shape-changing particle decays of Bi-185 and structure of the lightest odd-mass Bi isotopes2004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 5, p. 054308-Article in journal (Refereed)
    Abstract [en]

    Proton and alpha decay of the proton-rich nuclide Bi-185 has been restudied in more detail in the complete fusion reaction Nb-93(Mo-95, 3n)Bi-185 at the velocity filter SHIP. The observed decay pattern of Bi-185 and of the heavier odd-mass isotopes Bi-187,Bi-189,Bi-191,Bi-193 are interpreted based on potential-energy surface calculations. It is shown that the experimental systematics of the particle decays and of the excited states in these nuclei (where known) can be explained by the prolate-oblate shape co-existence at low excitation energy. The observed state in Bi-185 is proposed to be of prolate nature, which is in contrast with the previously proposed oblate interpretation.

  • 2.
    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    KTH, Superseded Departments, Physics.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    KTH, Superseded Departments, Physics.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    KTH, Superseded Departments, Physics.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    KTH, Superseded Departments, Physics.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    KTH, Superseded Departments, Physics.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    KTH, Superseded Departments, Physics.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.

  • 3. Delion, D. S.
    et al.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Karlgren, Daniel
    KTH, Superseded Departments, Physics.
    Liotta, Roberto
    KTH, Superseded Departments, Physics.
    Proton emission from triaxial nuclei2004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, no 6, p. 061301-Article in journal (Refereed)
    Abstract [en]

    Proton decay from triaxially deformed nuclei is investigated. The deformation parameters corresponding to the mother nucleus are determined microscopically and the calculated decay widths are used to probe the mean-field wave function. The proton wave function in the mother nucleus is described as a resonant state in a coupled-channel formalism. The decay width, as well as the angular distribution of the decaying particle, are evaluated and their dependence upon the triaxial deformation parameters is studied in the decay of Re-161 and Bi-185. It is found that the decay width is very sensitive to the parameters defining the triaxial deformation while the angular distribution is a universal function which does not depend upon details of the nuclear structure.

  • 4.
    Karlgren, Daniel
    KTH, School of Engineering Sciences (SCI), Physics.
    Nuclear structure aspects of proton and alpha particle decay2006Doctoral thesis, comprehensive summary (Other scientific)
  • 5.
    Karlgren, Daniel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Clark, R. M.
    Ragnarsson, I.
    Svensson, C. E.
    Ward, D.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Andreoiu, C.
    Austin, R. A. E.
    Carpenter, M. P.
    Cromaz, M.
    Deleplanque, M. A.
    Diamond, R. M.
    Fallon, P.
    Gorgen, A.
    Janssens, R. V. F.
    Khoo, T. L.
    Kondev, F.
    Lane, G. J.
    Lauritsen, T.
    Lee, I. Y.
    Macchiavelli, A. O.
    Rodinger, T.
    Rudolph, D.
    Sarantites, D. G.
    Seweryniak, D.
    Steinhardt, T.
    Stephens, F. S.
    Thelen, O.
    Vetter, K.
    Waddington, J. C.
    High-angular-momentum structures in Zn-642004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 3, p. 034330-Article in journal (Refereed)
    Abstract [en]

    High-angular-momentum states in Zn-64 were populated in the Ca-40(Si-28,4p) reaction at a beam energy of 122 MeV. Evaporated, light, charged particles were identified by the Microball, while gamma rays were detected using the Gammasphere array. The main focus of this paper is on two strongly coupled, collective bands. The yrast band, which was previously known, has been linked to lower-lying states establishing the excitation energies and angular momenta of in-band states for the first time. The newly identified excited band decays to the yrast band but firm angular-momentum assignments could not be made. In order to interpret these structures cranked-Nilsson-Strutinsky calculations have been performed. The calculations have been extended to account for the distribution of nucleons within a configuration. The yrast collective band is interpreted as based on the pi(f(7/2))(-1)(p(3/2)f(5/2))(2)(g(9/2))(1)nu(p(3/2)f(5/2))(4)(g(9/2))(2) configuration. There are several possible interpretations of the second band but it is difficult to distinguish between the different possibilities.

  • 6.
    Karlgren, Daniel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Huyse, M.
    Van de Vel, K.
    Van Duppen, P. B
    Alpha-decay hindrance factors: A probe of mean-field wave function2006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 6, p. 064304-Article in journal (Refereed)
    Abstract [en]

    A simple model to calculate alpha-decay hindrance factors (HF) with special emphasis on the shape coexistence in the Pb-Po region is presented. Using deformation values obtained from potential energy surface (PES) calculations as the only input, hindrance factors for the alpha decay of Rn and Po isotopes are calculated. The fair agreement between experimental and theoretical hindrance factors suggest that the wave function obtained from the energy minima of the PES calculations contains an important part of the correlations that play a role for the alpha decay. The model is applicable to shape coexistence in the Po and Pb region when minima are well defined. The calculated HF that emerge from these calculations render a different interpretation than the commonly assumed n-particle n-hole picture of the intruder states in the Pb region.

  • 7.
    Karlgren, Daniel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics.
    A mean-field approach to alpha decay hindrance factors2005In: Exotic Nuclear Systems / [ed] Gacsi, Z; Dombradi, Z; Krasznahorkay, A, 2005, Vol. 802, p. 309-312Conference paper (Refereed)
    Abstract [en]

    We propose a simple model for calculation of alpha decay hindrance factors. Using this model, we examine competing alpha decays populating several 0+ states in the daughter nuclei. These states have been described in the literature as belonging to different shapes. A scheme for calculation based on the Woods-Saxon model is developed. The deformation values are taken from potential energy surface calculations. Hence, no free parameters are introduced and only standard parameters of the Woods-Saxon potential are used.

  • 8.
    Karlgren, Daniel
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Mixing of wave functions at different shapes: A study of Alpha Decay Hindrance Factors within the Generator Coordinate MethodManuscript (preprint) (Other academic)
  • 9.
    Lagergren, Karin
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Joss, D. T.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Barton, C. J.
    Eeckhaudt, S.
    Grahn, T.
    Greenlees, P. T.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Jones, P. M.
    Julin, R.
    Juutinen, S.
    Karlgren, Daniel
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Kettunen, H.
    Leino, M.
    Leppanen, A. P.
    Nieminen, P.
    Nyman, M.
    Page, R. D.
    Pakarinen, J.
    Paul, E. S.
    Rahkila, P.
    Scholey, C.
    Simpson, J.
    Uusitalo, J.
    Wiseman, D. R.
    High-spin states in the proton-unbound nucleus Re-1612006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 74, no 2, p. 024316-Article in journal (Refereed)
    Abstract [en]

    Excited states in Re-161 were populated using the Cd-106(Ni-58, p2n) reaction at a beam energy of 270 MeV, resulting in the first observation of gamma rays emitted from this nucleus. The reaction products were separated from scattered beam and fission fragments by the gas-filled recoil separator RITU, and were implanted in the double-sided silicon strip detectors of the GREAT spectrometer. Prompt gamma rays were detected by the JUROGAM Ge detector array and were assigned to Re-161 based on alpha- and proton-decay tagging of the implanted reaction products. The near-yrast high-spin level structure, which was delineated to spins around 39/2, is discussed in the context of the total Routhian surface formalism. The level scheme is interpreted in terms of the alignment of h(9/2)/f(7/2) neutrons at lower spins, followed by excitations involving the pi h(11/2) subshell at higher spins.

  • 10. 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, Superseded Departments, Physics.
    Kojouharov, I.
    Leino, M.
    Lommel, B.
    Munzenberg, G.
    Moore, C.
    Page, R. D.
    Saro, S.
    Van Duppen, P.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Fine structure in the alpha decay of Po-188,Po-1922003In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 68, no 5Article in journal (Refereed)
    Abstract [en]

    The alpha decay of Po-188,Po-192 has been reexamined in order to probe the 0(+) states in the daughter nuclei Pb-184,Pb-188 that can be associated with coexisting spherical, oblate, and/or prolate configurations. Improved values were measured for the excitation energy and the feeding alpha -decay intensity of the 0(2)(+) state in Pb-184,Pb-188 and conflicting results on the 0(3)(+) state in Pb-188 were clarified. All known cases of fine structure in the alpha decay of the even-even Po nuclei are reviewed. The reduced alpha-decay width systematics combined with potential-energy-surface calculations confirm the onset of deformation in the ground state of the polonium nuclei around the neutron midshell. An isomeric state with a half-life of 580(100)ns has been identified in Po-192 .

  • 11. 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.

1 - 11 of 11
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