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Lifetime measurements and shape coexistence in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Dy</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>144</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

M. G. ProcterSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomD. M. CullenNuclear PhysicsC. ScholeyDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandB. NiclasenSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomPaolo Mason#N#University of Surrey#N#S. V. Rigby#N##TAB##TAB##TAB##TAB# University of Liverpool#N##TAB##TAB##TAB#J. A. DareSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomΑ. DewaldInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyP. T. GreenleesDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandH. IwasakiInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyU. JakobssonDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandPeter G. JonesDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandR. JulinDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandS. JuutinenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandS. KetelhutDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandM. LeinoDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandN. M. LumleySchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomO. MöllerInstitut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, GermanyM. NymanDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandP. PeuraInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyTh. PissullaInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyA. PuurunenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandP. RahkilaDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandW. RotherInstitut für Kernphysik, Universität zu Köln, D-50937 Köln, GermanyP. RuotsalainenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ. SarénDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ. SorriDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ. UusitaloDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, Finland

Physical Review Cjournal2010lv

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Annotatsiya

The known level scheme of $^{144}\mathrm{Dy}$ has been extended and lifetime measurements have been made with the recoil-distance Doppler-shift method. Reduced transition probabilities and deformations have been determined for four low-lying transitions. These states form part of the first observed band crossing, giving information on the change in nuclear deformation resulting from the rearrangement of ${h}_{11/2}$ protons in the nucleus. Two bands built upon excited ${10}^{+}$ states have been assigned $\ensuremath{\pi}({h}_{11/2}){}^{2}$ prolate and $\ensuremath{\nu}({h}_{11/2}){}^{\ensuremath{-}2}$ oblate configurations with $\ensuremath{\tau}=12(2)\text{ps}$ and $0.01<\ensuremath{\tau}\ensuremath{\lesssim}16\text{ns}$, respectively. These long lifetimes are reasoned to be a result of shape coexistence at low energy and moderate spin. A known four-quasiparticle dipole band has been extended to higher spin and lifetime measurements suggest a long-lived bandhead state. In this case, the excited states in the band may be consistent with a shears model interpretation of a magnetic dipole rotor. However, the measured $B(M1)/B(E2)$ branching ratios reveal a larger than expected deformed rotational component compared with that in the analogous band in the lower mass isotone $^{142}\mathrm{Gd}$.

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Nuclear physics research studies Atomic and Molecular Physics Advanced Chemical Physics Studies

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DOI: 10.1103/physrevc.81.054320

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