Low-spin structure of 8635Br51 and 8636Kr50 nuclei: The role of the g7/2 neutron orbital

被引：18

作者：

Urban, W. ^{[1
]}

Sieja, K. ^{[2
,3
]}

Materna, T. ^{[4
]}

Czerwinski, M. ^{[1
]}

Rzaca-Urban, T. ^{[1
]}

Blanc, A. ^{[5
]}

Jentschel, M. ^{[5
]}

Mutti, P. ^{[5
]}

Koster, U. ^{[5
]}

Soldner, T. ^{[5
]}

de France, G. ^{[6
]}

Simpson, G. S. ^{[7
,8
]}

Ur, C. A. ^{[9
]}

Bernards, C. ^{[10
]}

Fransen, C. ^{[10
]}

Jolie, J. ^{[10
]}

Regis, J. -M. ^{[10
]}

Thomas, T. ^{[10
]}

Warr, N. ^{[10
]}

机构：

[1] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland

[2] Univ Strasbourg, IPHC, Strasbourg, France

[3] CNRS, UMR7178, F-67037 Strasbourg, France

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

[5] Inst Laue Langevin, 71 Av Martyrs, F-38042 Grenoble, France

[6] CNRS, GANIL, CEA, DSM,IN2P3, Bd Henri Becquerel,BP 55027, F-14076 Caen 5, France

[7] Univ Joseph Fourier Grenoble 1, LPSC, CNRS, IN2P3,Inst Natl Polytech Grenoble, F-38026 Grenoble, France

[8] Univ West Scotland, Paisley PA1 2BE, Renfrew, Scotland

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

[10] Uniersitat Koln, IKP, Zulpicherstr 77, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW C | 2016年 / 94卷 / 04期

关键词：

MIXED-SYMMETRY STATES; GAMMA-RAY; SHELL-MODEL; DECAY; EXCITATIONS; ISOTOPES; ENERGY;

D O I：

10.1103/PhysRevC.94.044328

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：

Low-spin excited levels in Br-86(35)51 and Kr-86(36)50, populated following beta(-) decay and the neutron-induced fission of U-235, were measured using the Lohengrin fission-fragment separator and the EXILL array of Ge detectors at the PF1B cold-neutron facility of the Institute Laue-Langevin Grenoble. Improved populations of excited levels in Br-86 remove inconsistencies existing in the literature on this nucleus. Directional-linear-polarization correlations, analyzed using newly developed formulas, as well as precise angular correlations allowed the unique 1(-) and 2(-) spin and parity assignments to the ground state of Br-86 and the 4016.3-keV level in Kr-86, respectively. Based on these results we propose that the Gamow-Teller beta(-) decays of Se-86 and Br-86 involve the nu g(7/2) -> pi g(9/2) transition in addition to the nu p(3/2) -> pi p(3/2) transition proposed earlier. In Kr-86 we have identified 1(1)(+), 2(3)(+), and 3(1)(+) levels, analogous to the mixed- symmetry states in Mo-94, which in Kr-86 are from proton excitations, only. Large-scale, shell-model calculations with refined interactions reproduce well excitations in Br-86 and Kr-86 and support our interpretations.

引用

页数：19

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