Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

被引：55

作者：

Browne, F. ^{[1
,2
]}

Bruce, A. M. ^{[1
]}

Sumikama, T. ^{[2
,3
]}

Nishizuka, I. ^{[3
]}

Nishimura, S. ^{[2
]}

Doornenbal, P. ^{[2
]}

Lorusso, G. ^{[2
]}

Soederstroem, P. -A. ^{[2
]}

Watanabe, H. ^{[2
,4
]}

Daido, R. ^{[5
]}

Patel, Z. ^{[2
,6
]}

Rice, S. ^{[2
,6
]}

Sinclair, L. ^{[2
,7
]}

Wu, J. ^{[2
,8
]}

Xu, Z. Y. ^{[9
,10
]}

Yagi, A. ^{[5
]}

Baba, H. ^{[2
]}

Chiga, N. ^{[2
,3
]}

Carroll, R. ^{[6
]}

Didierjean, F. ^{[11
]}

Fang, Y. ^{[5
]}

Fukuda, N. ^{[2
]}

Gey, G. ^{[2
,12
,13
]}

Ideguchi, E. ^{[5
]}

Inabe, N. ^{[2
]}

Isobe, T. ^{[2
]}

Kameda, D. ^{[2
]}

Kojouharov, I. ^{[14
]}

Kurz, N. ^{[14
]}

Kubo, T. ^{[2
]}

Lalkovski, S. ^{[15
]}

Li, Z. ^{[8
]}

Lozeva, R. ^{[11
]}

Nishibata, H. ^{[5
]}

Odahara, A. ^{[5
]}

Podolyak, Zs. ^{[6
]}

Regan, P. H. ^{[6
,16
]}

Roberts, O. J. ^{[1
]}

Sakurai, H. ^{[2
,9
]}

Schaffner, H. ^{[14
]}

Simpson, G. S. ^{[12
]}

Suzuki, H. ^{[2
]}

Takeda, H. ^{[2
]}

Tanaka, M. ^{[5
]}

Taprogge, J. ^{[2
,17
,18
]}

Werner, V. ^{[19
,20
]}

Wieland, O. ^{[21
]}

机构：

[1] Univ Brighton, Sch Comp Engn & Math, Brighton BN2 4GJ, E Sussex, England

[2] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

[3] Tohoku Univ, Dept Phys, Aoba Ku, Sendai, Miyagi 9808578, Japan

[4] Beihang Univ, Sch Phys & Nucl Energy Engn, IRCNPC, Beijing 100191, Peoples R China

[5] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

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

[7] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

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

[9] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[10] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[11] Univ Strasbourg, IPHC, CNRS, IN2P3, F-67037 Strasbourg, France

[12] Univ Grenoble Alpes, CNRS, IN2P3, LPSC, F-38026 Grenoble, France

[13] ILL Grenoble, F-38042 Grenoble, France

[14] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[15] Univ Sofia, Dept Phys, Sofia 1164, Bulgaria

[16] Natl Phys Lab, Teddington TW11 0LW, Middx, England

[17] Univ Autonoma Madrid, Dept Fis Teor, E-28049 Madrid, Spain

[18] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[19] Yale Univ, AW Wright Nucl Struct Lab, New Haven, CT 06520 USA

[20] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[21] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

来源：

PHYSICS LETTERS B | 2015年 / 750卷

基金：

英国工程与自然科学研究理事会;

关键词：

NUCLEAR-DATA SHEETS; BIGRIPS SEPARATOR; NEUTRON; SPECTROSCOPY; DESPEC; ZR-100; MO-104; ZR;

D O I：

10.1016/j.physletb.2015.09.043

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2(+) states in Zr-104,Zr-106 nuclei have been measured via beta-delayed gamma-ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 2(1)(+) state in Zr-104 was obtained, tau(2(1)(+)) = 2.90(-20)(+25) ns, as well as a first measurement of the 2(1)(+) state in Zr-106, tau(2(1)(+)) = 2.60(-15)(+20) ns, with corresponding reduced transition probabilities of B(E2; 2(1)(+) -> 0(g.s.)(+)) = 0.39(2) e(2)b(2) and 0.31(1) e(2)b(2), respectively. Comparisons of the extracted ground-state deformations, beta(2) = 0.39(1) (Zr-104) and beta(2) = 0.36(1) (Zr-106) with model calculations indicate a persistence of prolate deformation. The data show that Zr-104 is the most deformed of the neutron-rich Zr isotopes measured so far. (C) 2015 The Authors. Published by Elsevier B.V.

引用

页码：448 / 452

页数：5

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