Decays of New Nuclides and Isomers Beyond the Proton Drip Line - The Influence of Neutron Configurations

被引：0
|
作者：
Page, R. D. [1 ]
Bianco, L. [1 ]
Darby, I. G. [1 ]
Joss, D. T. [1 ]
Simpson, J.
Al-Khalili, J. S.
Cannon, A. J.
Cooper, R. J. [1 ]
Eeckhaudt, S.
Erturk, S.
Gall, B.
Grahn, T. [1 ]
Greenlees, P. T.
Hadinia, B.
Jones, P. M.
Judson, D. S. [1 ]
Julin, R.
Juutinen, S.
Ketelhut, S.
Labiche, M.
Leino, M.
Leppanen, A. -P.
Nyman, M.
O'Donnell, D.
Rahkila, P.
Sapple, P. J. [1 ]
Saren, J.
Scholey, C.
Steer, A. N.
Stevenson, P. D.
Suckling, E. B.
Thomson, J. [1 ]
Uusitalo, J.
Venhart, M.
机构：
[1] Univ Liverpool, Oliver Lodge Lab, Dept Phys, Liverpool L69 7ZE, Merseyside, England
来源：
NUCLEAR PHYSICS AND ASTROPHYSICS | 2008年 / 1072卷
关键词：
NUCLEAR REACTIONS Ni-58+Cd-106 at 290; 300; 310 MeV beam energy; enriched targets; gas-filled recoil separator; segmented Si and Ge detectors; Measured E-alpha; E-proton; E gamma t(1/2);
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The energy of the vh(9/2) orbital in nuclei above N = 82 drops rapidly in energy relativeto the vf(7/2) orbital as the occupancy of the pi h(11/12) orbital increases. These two neutron orbitals become nearly degenerate as the proton drip line is approached. In this work, we have discovered the new nuclides Os-161 and W-157, and studied the decays of the proton emitter Re-160 in detail. The Os-161 and Re-160 nuclei were produced in reactions of 290, 300 and 310 MeV Ni-58 ions with an isotopically enriched Cd-106 target, separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The Os-161 alpha decays populated the new nuclide W-157, which decayed by beta-particle emission. The beta decay fed the known alpha-decaying 1/2(+) and 11/2 states in Ta-157. which is consistent with a vf(7/2) round state in W-157. The measured alpha-decay energy and half-life for Os-161 correspond to a reduced a-decay width that is compatible with,wave alpha-particle emission, implying that its ground state is also a vf(7/2) state. Over 7000 Re-160 nuclei were produced and the gamma decays of a new isomeric state feeding the pi d(3/2) level in Re-160 were discovered, but no evidence for the proton or a decay of the expected pi h(11/2) state could be found. The isomer decays offer a natural explanation for this non-observation and provides a staking example of the influence of the near degeneracy of the vh(9/2) and vf(7/2) orbitals on the properties of nuclei in this region.
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页码：172 / +
页数：2
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