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  • 1. Auranen, K.
    et al.
    Uusitalo, J.
    Juutinen, S.
    Badran, H.
    Bisso, F. Defranchi
    Cox, D.
    Grahn, T.
    Greenlees, P. T.
    Herzan, A.
    Jakobsson, Ulrika
    KTH, School of Engineering Sciences (SCI), Physics. University of Helsinki, Finland.
    Julin, R.
    Konki, J.
    Leino, M.
    Lightfoot, A.
    Mallaburn, M. J.
    Neuvonen, O.
    Pakarinen, J.
    Papadakis, P.
    Partanen, J.
    Rahkila, P.
    Sandzelius, M.
    Saren, J.
    Scholey, C.
    Sorri, J.
    Stolze, S.
    Wang, Y. K.
    Prompt and delayed spectroscopy of At-203: Observation of a shears band and a 29/2(+) isomeric state2018In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 97, no 2, article id 024301Article in journal (Refereed)
    Abstract [en]

    Using fusion-evaporation reactions, a gas-filled recoil separator, recoil-gating technique and recoil-isomer decay tagging technique we have extended the level scheme of At-203 (N = 118) significantly. We have observed an isomeric [tau = 14.1(3) mu s] state with a spin and parity of 29/2(+). The isomeric state is suggested to originate from the pi(h(9/2)) circle times |Po-202; 11(-)> coupling, and it is depopulated through 286 keV E2 and 366 keV E3 transitions. In addition, we have observed a cascade of magnetic-dipole transitions which is suggested to be generated by the shears mechanism.

  • 2. Badran, H.
    et al.
    Scholey, C.
    Uusitalo, J.
    Auranen, K.
    Grahn, T.
    Greenlees, P. T.
    Herzan, A.
    Jakobsson, Ulrika
    KTH, School of Engineering Sciences (SCI), Physics.
    Julin, R.
    Juutinen, S.
    Konki, J.
    Leino, M.
    Mallaburn, M. J.
    Pakarinen, J.
    Papadakis, P.
    Partanen, J.
    Peura, P.
    Rahkila, P.
    Sandzelius, M.
    Saren, J.
    Sorri, J.
    Stolze, S.
    Decay spectroscopy of Pb-179(82)97 and evidence for a 9/2(-) intruder state in Tl-179(81)982017In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 96, no 6, article id 064314Article in journal (Refereed)
    Abstract [en]

    The very neutron-deficient isobars Pb-179 and Tl-179 have been produced using the fusion-evaporation reactions Pd-104(Kr-78,xpyn), where x <= 1 and y >= 2. The gas-filled separator RITU was employed to transport and separate the recoiling nuclei of interest from the scattered beam and unwanted products. The GREAT spectrometer was used to study the decay properties through alpha-alpha and alpha-gamma correlations, which has allowed the ground state of Pb-179 to be assigned as I-pi = 9/2(-). The decay of Pb-179 was measured to have an alpha-particle energy and half-life of E-alpha = 7348(5) keV and t(1/2) = 2.7(2) ms, respectively. A search for a nu i(13/2) state in Pb-179 was performed, but only a limit of excitation energy and half-life was obtained. In Tl-179 a t(1/2) = 114(-10)(+18) ns isomeric state, likely at an excitation energy of 904.5(9) keV, was identified and is tentatively assigned to be a 9/2(-) proton intruder state.

  • 3.
    Doncel, Maria
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics.
    Li, Hongjie J.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Jakobsson, Ulrika
    KTH, School of Engineering Sciences (SCI), Physics.
    Auranen, K.
    Boenig, S.
    Drummond, M. C.
    Grahn, T.
    Greenlees, P. T.
    Herzan, A.
    Joss, D. T.
    Julin, R.
    Juutinen, S.
    Konki, J.
    Kroell, T.
    Leino, M.
    McPeake, C.
    O'Donnell, D.
    Page, R. D.
    Pakarinen, J.
    Partanen, J.
    Peura, P.
    Rahkila, P.
    Ruotsalainen, P.
    Sandzelius, M.
    Saren, J.
    Saygi, B.
    Scholey, C.
    Sorri, J.
    Stolze, S.
    Taylor, M. J.
    Thornthwaite, A.
    Uusitalo, J.
    Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei2017In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 95, no 4, article id 044321Article in journal (Refereed)
    Abstract [en]

    Lifetimes of the first excited 2(+) states in the extremely neutron- deficient W-162 and W-164 nuclei have been measured using the recoil distance Doppler shift technique. Experimental B(E2) data for the isotopic chains of hafnium, tungsten, and osmium, from the midshell region near the beta-stability line towards the N = 82 closed shell and the most neutron-deficient nuclides, are compared with predictions of nuclear deformations and 2(1)(+) -> 0(g.s)(.+) reduced transition strengths from different classes of state-of-the-art theoretical model calculations. The results reveal striking differences and deficiencies in the predictive power of current nuclear structure models.

  • 4.
    Parr, E.
    et al.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Page, R. D.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Joss, D. T.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Ali, F. A.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.;Univ Sulaimani, Coll Educ, Dept Phys, POB 334, Sulaimani, Kurdistan Regio, Iraq.;Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada..
    Auranen, K.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.;Argonne Natl Lab, Phys Div, Argonne, IL 60439 USA..
    Capponi, L.
    Univ West Scotland, Sch Engn & Comp, Paisley PA1 2BE, Renfrew, Scotland.;Scottish Univ Phys Alliance, Glasgow G12 8QQ, Lanark, Scotland.;Horia Hulubei Natl Inst Res Phys & Nucl Engn, ELI NP, Bucharest, Romania..
    Grahn, T.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Greenlees, P. T.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Henderson, J.
    Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England.;Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA..
    Herzan, A.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.;Slovak Acad Sci, Inst Phys, SK-84511 Bratislava, Slovakia..
    Jakobsson, Ulrika
    KTH, School of Engineering Sciences (SCI), Physics. Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.
    Julin, R.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Juutinen, S.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Konki, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.;CERN, CH-1211 Geneva 23, Switzerland..
    Labiche, M.
    STFC Daresbury Lab, Nucl Phys Grp, Warrington WA4 4AD, Cheshire, England..
    Leino, M.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Mason, P. J. R.
    STFC Daresbury Lab, Nucl Phys Grp, Warrington WA4 4AD, Cheshire, England..
    McPeake, C.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    O'Donnell, D.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.;Univ West Scotland, Sch Engn & Comp, Paisley PA1 2BE, Renfrew, Scotland..
    Pakarinen, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Papadakis, P.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.;Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Partanen, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Peura, P.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Rahkila, P.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Revill, J. P.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Ruotsalainen, P.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Sandzelius, M.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Saren, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Scholey, C.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Simpson, J.
    STFC Daresbury Lab, Nucl Phys Grp, Warrington WA4 4AD, Cheshire, England..
    Smith, J. F.
    Univ West Scotland, Sch Engn & Comp, Paisley PA1 2BE, Renfrew, Scotland.;Scottish Univ Phys Alliance, Glasgow G12 8QQ, Lanark, Scotland..
    Smolen, M.
    Univ West Scotland, Sch Engn & Comp, Paisley PA1 2BE, Renfrew, Scotland.;Scottish Univ Phys Alliance, Glasgow G12 8QQ, Lanark, Scotland..
    Sorri, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Stolze, S.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland.;Argonne Natl Lab, Phys Div, Argonne, IL 60439 USA..
    Thornthwaite, A.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Uusitalo, J.
    Univ Jyvaskyla, Dept Phys, POB 35, FI-40014 Jyvaskyla, Finland..
    Fine structure in the alpha decay of high-spin isomers in Lu-155 and Hf-1562018In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 98, no 2, article id 024321Article in journal (Refereed)
    Abstract [en]

    Fine structure in the a decay of high-spin isomers in Lu-155( 25/2(-)) and Hf-156(8(+))has been studied for the first time using alpha gamma- coincidence analysis. Three new a decays from Lu-155(25/2(-)) and two from Hf-156(8(+)) have been identified, populating seniority s > 1 states in the N = 82 nuclei Tm-151 and Yb-152, respectively. The reduced hindrance factors of the a decays support the previous configuration assignments of the populated states. This is the first observation of states with excitation energy greater than 1.5 MeV being populated following a decay in nuclei outside of the Pb-208 region.

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