Article

High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>K</mml:mi></mml:mrow></mml:math>four-quasiparticle states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Gd</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>138</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

M. G. ProcterSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomD. M. CullenSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomC. ScholeyDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandP. T. GreenleesDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ. HirvonenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandU. 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 KingdomPaolo MasonSchuster Laboratory, University of Manchester, Manchester M13 9PL, United KingdomP. NieminenDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandM. NymanDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandP. PeuraDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandP. RahkilaDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ.-M. RégisInstitut 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, FinlandYue ShiDepartment of Technical Physics, Peking University, Beijing 100871, ChinaJ. SorriDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandS. StolzeDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandJ. UusitaloDepartment of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, FinlandF. R. XuDepartment of Technical Physics, Peking University, Beijing 100871, China

Physical Review Cjournal2011lv

ABI

Abstract

States above the known ${K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}$ 6 $\ensuremath{\mu}$s isomer in $^{138}\mathrm{Gd}$ have been populated with the $^{106}\mathrm{Cd}$($^{36}\mathrm{Ar}$,$2p2n$) reaction at a beam energy of 180 MeV at the University of Jyv\"askyl\"a, Finland. The recoil-isomer tagging technique was utilized to correlate delayed $\ensuremath{\gamma}$-ray decays, detected in the GREAT focal plane spectrometer, with prompt decays measured in the JUROGAM II spectrometer at the target position. The lifetime of the ${K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}$ isomeric state has been remeasured as 6.2(2) $\ensuremath{\mu}$s. Two high-lying strongly coupled bands have been established with ${K}^{\ensuremath{\pi}}\ensuremath{\geqslant}{12}^{\ensuremath{-}}$. Potential-energy surface calculations, in conjunction with $g$ factor measurements, reveal that they are built upon four-quasiparticle structures comprising two-quasineutron plus two-quasiproton configurations. The short half-life or lack of hindrance for the decays from these four-quasiparticle band-head states is reasoned to be a consequence of increased triaxial deformation and mixing due to the high density of states relative to the lower two-quasiparticle 6-$\ensuremath{\mu}$s isomeric state.

Topics

Nuclear physics research studies Rare-earth and actinide compounds Astronomical and nuclear sciences

Identifiers

DOI: 10.1103/physrevc.83.034311

Citations and references

Cited by 035 references

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