Direct Observation of Long-Lived Isomers in 212Bi

被引：26

作者：

Chen, L. ^{[1
,2
,3
]}

Walker, P. M. ^{[4
]}

Geissel, H. ^{[1
,2
]}

Litvinov, Yu. A. ^{[1
,5
]}

Beckert, K. ^{[1
]}

Beller, P. ^{[1
]}

Bosch, F. ^{[1
]}

Boutin, D. ^{[1
]}

Caceres, L. ^{[1
]}

Carroll, J. J. ^{[6
]}

Cullen, D. M. ^{[7
]}

Cullen, I. J. ^{[4
]}

Franzke, B. ^{[1
]}

Gerl, J. ^{[1
]}

Gorska, M. ^{[1
]}

Jones, G. A. ^{[4
]}

Kishada, A. ^{[7
]}

Knoebel, R. ^{[1
]}

Kozhuharov, C. ^{[1
]}

Kurcewicz, J. ^{[1
]}

Litvinov, S. A. ^{[1
]}

Liu, Z. ^{[4
,8
]}

Mandal, S. ^{[1
]}

Montes, F. ^{[9
]}

Muenzenberg, G. ^{[1
]}

Nolden, F. ^{[1
]}

Ohtsubo, T. ^{[10
]}

Patyk, Z. ^{[11
]}

Plass, W. R. ^{[2
]}

Podolyak, Zs ^{[4
]}

Rigby, S. ^{[7
]}

Saito, N. ^{[1
]}

Saito, T. ^{[1
]}

Scheidenberger, C. ^{[1
,2
]}

Simpson, E. C. ^{[4
]}

Shindo, M. ^{[12
]}

Steck, M. ^{[1
]}

Sun, B. ^{[1
]}

Williams, S. J. ^{[4
]}

Weick, H. ^{[1
]}

Winkler, M. ^{[1
]}

Wollersheim, H. -J. ^{[1
]}

Yamaguchi, T. ^{[13
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[2] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[3] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[4] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[5] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[6] USA, Res Lab, Adelphi, MD 20783 USA

[7] Univ Manchester, Schuster Lab, Manchester M13 9PL, Lancs, England

[8] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[9] Michigan State Univ, E Lansing, MI 48824 USA

[10] Niigata Univ, Dept Phys, Niigata 9502181, Japan

[11] Natl Ctr Nucl Res, PL-00681 Warsaw, Poland

[12] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[13] Saitama Univ, Grad Sch Sci & Engn, Saitama 3388570, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 12期

关键词：

FRS-ESR FACILITY; NUCLEAR-PHYSICS; DECAY; NUCLEOSYNTHESIS; DEPLETION; STATES; GSI;

D O I：

10.1103/PhysRevLett.110.122502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Long-lived isomers in Bi-212 have been studied following U-238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi-212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0 (3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies. DOI: 10.1103/PhysRevLett.110.122502

引用

页数：5

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