β--delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

被引：58

作者：

Alkhomashi, N. ^{[1
]}

Regan, P. H. ^{[1
]}

Podolyak, Zs. ^{[1
]}

Pietri, S. ^{[1
]}

Garnsworthy, A. B. ^{[1
]}

Steer, S. J. ^{[1
]}

Benlliure, J. ^{[2
]}

Caserejos, E. ^{[2
]}

Casten, R. F. ^{[3
]}

Gerl, J. ^{[4
]}

Wollersheim, H. J. ^{[4
]}

Grebosz, J. ^{[5
]}

Farrelly, G. ^{[1
]}

Gorska, M. ^{[4
]}

Kojouharov, I. ^{[4
]}

Schaffner, H. ^{[4
]}

Algora, A. ^{[6
,7
]}

Benzoni, G. ^{[8
]}

Blazhev, A. ^{[9
]}

Boutachkov, P. ^{[4
]}

Bruce, A. M. ^{[10
]}

Bacelar, A. M. Denis ^{[10
]}

Cullen, I. J. ^{[1
]}

Caceres, L. ^{[4
]}

Doornenbal, P. ^{[4
]}

Estevez, M. E. ^{[2
]}

Fujita, Y. ^{[11
]}

Gelletly, W. ^{[1
]}

Hoischen, R. ^{[4
,12
]}

Kumar, R. ^{[13
]}

Kurz, N. ^{[4
]}

Lalkovski, S. ^{[10
]}

Liu, Z. ^{[14
]}

Mihai, C. ^{[15
]}

Molina, F. ^{[6
]}

Morales, A. I. ^{[2
]}

Muecher, D. ^{[9
]}

Prokopowicz, W. ^{[4
]}

Rubio, B. ^{[6
]}

Shi, Y. ^{[16
]}

Tamii, A. ^{[17
]}

Tashenov, S. ^{[4
]}

Valiente-Dobon, J. J. ^{[18
]}

Walker, P. M. ^{[1
]}

Woods, P. J. ^{[14
]}

Xu, F. R. ^{[16
]}

机构：

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

[2] Univ Santiago de Compostela, E-15706 Santiago De Compostela, Spain

[3] Yale Univ, WNSL, New Haven, CT 06520 USA

[4] GSI Darmstadt, D-64291 Darmstadt, Germany

[5] Henryk Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[6] Univ Valencia, CSIC, IFIC, E-46071 Valencia, Spain

[7] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary

[8] Univ Milan, Ist Nazl Fis Nucl, I-20133 Milan, Italy

[9] Univ Cologne, IKP, D-50937 Cologne, Germany

[10] Univ Brighton, Sch Environm & Technol, Brighton BN2 4GJ, E Sussex, England

[11] Osaka Univ, Dept Phys, Osaka, Japan

[12] Lund Univ, Dept Phys, S-22100 Lund, Sweden

[13] IUAC, New Delhi, India

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

[15] Horia Hulubei Natl Inst Phys & Nucl Engn, R-76900 Bucharest, Romania

[16] Peking Univ, Dept Tech Phys, Beijing 100871, Peoples R China

[17] Osaka Univ, Res Ctr Nucl Phys, Osaka, Japan

[18] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy

来源：

PHYSICAL REVIEW C | 2009年 / 80卷 / 06期

基金：

瑞典研究理事会; 英国工程与自然科学研究理事会;

关键词：

ISOMER SPECTROSCOPY; STATES; STABILITY; SYMMETRY; PT-196;

D O I：

10.1103/PhysRevC.80.064308

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.

引用

页数：12

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