Simultaneous investigation of the T=1(Jπ=0+) and T=0(Jπ=9+) β decays in 70Br

被引：20

作者：

Morales, A. I. ^{[1
,2
,3
]}

Algora, A. ^{[1
,4
]}

Rubio, B. ^{[1
]}

Kaneko, K. ^{[5
]}

Nishimura, S. ^{[6
]}

Aguilera, P. ^{[7
]}

Orrigo, S. E. A. ^{[1
]}

Molina, F. ^{[7
]}

de Angelis, G. ^{[8
]}

Recchia, F. ^{[9
,10
]}

Kiss, G. ^{[6
]}

Phong, V. H. ^{[6
,11
]}

Wu, J. ^{[6
]}

Nishimura, D. ^{[12
]}

Oikawa, H. ^{[13
]}

Goigoux, T. ^{[14
]}

Giovinazzo, J. ^{[14
]}

Ascher, P. ^{[14
]}

Agramunt, J. ^{[1
]}

Ahn, D. S. ^{[6
]}

Baba, H. ^{[6
]}

Blank, B. ^{[14
]}

Borcea, C. ^{[15
]}

Boso, A. ^{[9
,10
]}

Davies, P. ^{[16
]}

Diel, F. ^{[17
]}

Dombardi, Zs. ^{[4
]}

Doornenbal, P. ^{[6
]}

Eberth, J. ^{[17
]}

de France, G. ^{[18
]}

Fujita, Y. ^{[19
,20
]}

Fukuda, N. ^{[6
]}

Ganioglu, E. ^{[21
]}

Gelletly, W. ^{[1
,22
]}

Gerbaux, M. ^{[14
]}

Grevy, S.

Guadilla, V. ^{[1
]}

Inabe, N. ^{[6
]}

Isobe, T. ^{[6
]}

Kojouharov, I. ^{[23
]}

Korten, W. ^{[24
]}

Kubo, T. ^{[6
]}

Kubono, S. ^{[6
]}

Nieto, T. Kurtukian ^{[14
]}

Kurz, N. ^{[23
]}

Lee, J. ^{[25
]}

Lenzi, S. ^{[9
,10
]}

Liu, J. ^{[25
]}

Lokotko, T. ^{[25
]}

Lubos, D. ^{[26
]}

机构：

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

[2] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

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

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

[5] Kyushu Sangyo Univ, Dept Phys, Fukuoka 8138503, Japan

[6] RIKEN, Nishina Ctr, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[7] Comis Chilena Energia Nucl, Casilla 188-D,Amunategui 95,Santiago Ctr, Santiago, Chile

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

[9] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[10] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[11] VNU Hanoi Univ Sci, Fac Phys, 334 Nguyen Trai, Hanoi, Vietnam

[12] Tokyo City Univ, Dept Phys, Setagaya Ku, Tokyo 1588557, Japan

[13] Univ Tokyo Sci, Dept Phys, Noda, Chiba 2788510, Japan

[14] Univ Bordeaux, CNRS, IN2P3, Ctr Etudes Nucl Bordeaux Gradignan,UMR 5797, 19 Chemin Solarium,CS10120, F-33175 Gradignan, France

[15] Nat Inst Phys & Nucl Engn IFIN HH, POB MG-6, Bucharest, Romania

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

[17] Univ Cologne, Inst Nucl Phys, D-50937 Cologne, Germany

[18] Grand Accelerateur Natl Ions Lourds, BP 55027, F-14076 Caen 05, France

[19] Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan

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

[21] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey

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

[23] GSI Darmstadt, Planckstr 1, D-64291 Darmstadt, Germany

[24] CEA Saclay, IRFU, SPhN, F-91191 Gif Sur Yvette, France

[25] Univ Hong Kong, Dept Phys, Pokfulam, Hong Kong, Peoples R China

[26] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany

[27] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

来源：

PHYSICAL REVIEW C | 2017年 / 95卷 / 06期

基金：

新加坡国家研究基金会; 英国科学技术设施理事会;

关键词：

SHAPE COEXISTENCE; HALF-LIVES; HIGH-SPIN; NUCLEI; IDENTIFICATION; EVOLUTION; STATES; SE-70; AS-66; BEAMS;

D O I：

10.1103/PhysRevC.95.064327

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 beta decay of the odd-odd nucleus Br-70 has been investigated with the BigRIPS and EURICA setups at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center. The T = 0(J(pi) = 9(+)) and T = 1(J(pi) = 0(+)) isomers have both been produced in in-flight fragmentation of Kr-78 with ratios of 41.6(8)% and 58.4(8)%, respectively. A half-life of t(1/2) = 2157(-49)(+53) ms has been measured for the J pi = 9(+) isomer from gamma-ray time decay analysis. Based on this result, we provide a new value of the half-life for the J pi = 0(+) ground state of Br-70, t(1/2) = 78.42 +/- 0.51 ms, which is slightly more precise, and in excellent agreement, with the best measurement reported hitherto in the literature. For this decay, we provide the first estimate of the total branching fraction decaying through the 2(1)(+) state in the daughter nucleus Se-70, R(2(1)(+)) = 1.3 +/- 1.1%. We also report four new low-intensity gamma-ray transitions at 661, 1103, 1561, and 1749 keV following the beta decay of the J pi = 9(+) isomer. Based on their coincidence relationships, we tentatively propose two new excited states at 3945 and 4752 keV in 70Se with most probable spins and parities of J(pi) = (6(+)) and (8(+)), respectively. The observed structure is interpreted with the help of shell-model calculations, which predict a complex interplay between oblate and prolate configurations at low excitation energies.

引用

页数：11

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