gamma-soft Ba-146 and the role of nonaxial shapes at N approximate to 90

Mitchell A. J.; Lister C. J.; McCutchan E. A.; Albers M.; Ayangeakaa A. D.; Bertone P. F.; Carpenter M. P.; Chiara C. J.; Chowdhury P.; Clark J. A.; Copp P.; David H. M.; Deo A. Y.; DiGiovine B.; DOlympia N.; Dungan R.; Harding R. D.; Harker J.; Hota S. S.; Janssens R. V. F.; Kondev F. G.; Liu S. H.; Ramayya A. V.; Rissanen J.; Savard G.; Seweryniak D.; Shearman R.; Sonzogni A. A.; Tabor S. L.; Walters W. B.; Wang E.; Zhu S.

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gamma-soft Ba-146 and the role of nonaxial shapes at N approximate to 90

机译：Gamma-Soft Ba-146和N近似值的非轴形状的作用

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Low-spin states in the neutron-rich, N = 90 nuclide Ba-146 were populated following beta decay of Cs-146, with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of Cs-146 were extracted from a 1.7-Ci Cf-252 source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin beta detectors, surrounded by a highly efficient high-purity Ge array. The new Ba-146 decay scheme now contains 31 excited levels extending up to similar to 2.5 MeV excitation energy, double what was previously known. These data are compared to predictions from the interacting boson approximation (IBA) model. It appears that the abrupt shape change found at N = 90 in Sm and Gd is much more gradual in Ba and Ce, due to an enhanced role of the gamma degree of freedom.

机译：在CS-146的β衰减后填充了中子中的低旋转状态N = 90个核素BA-146，其目的是通过描绘其壬酯结构来阐明钡同位素的变形的发展。使用Californium稀有离子饲养剂升级（Caribu）设施选择CS-146的裂变片段。低能量离子沉积在一箱薄β探测器的中心，周围由高效的高纯度GE阵列包围。新的BA-146衰减方案现在包含31个兴奋水平，延伸到类似于2.5 MeV励磁能量，以前已知的两倍。将这些数据与来自相互作用的玻斯近似（IBA）模型的预测进行比较。由于伽玛自由度的作用增强，SM和GD在SM和GD中发现的突然形状变化在BA和CE中更加逐渐逐渐变化。

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《Physical review, C》 |2016年第1期|共9页
作者
Mitchell A. J.; Lister C. J.; McCutchan E. A.; Albers M.; Ayangeakaa A. D.; Bertone P. F.; Carpenter M. P.; Chiara C. J.; Chowdhury P.; Clark J. A.; Copp P.; David H. M.; Deo A. Y.; DiGiovine B.; DOlympia N.; Dungan R.; Harding R. D.; Harker J.; Hota S. S.; Janssens R. V. F.; Kondev F. G.; Liu S. H.; Ramayya A. V.; Rissanen J.; Savard G.; Seweryniak D.; Shearman R.; Sonzogni A. A.; Tabor S. L.; Walters W. B.; Wang E.; Zhu S.;
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作者单位

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Brookhaven Natl Lab Natl Nucl Data Ctr Upton NY 11973 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Florida State Univ Dept Phys Tallahassee FL 32306 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Nucl Engn Div Argonne IL 60439 USA;

Univ Kentucky Dept Chem Lexington KY 40506 USA;

Vanderbilt Univ Dept Phys Nashville TN 37235 USA;

Univ Calif Berkeley Lawrence Berkeley Natl Lab Berkeley CA 94720 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

Univ Massachusetts Dept Phys &

Appl Phys Lowell MA 01854 USA;

Brookhaven Natl Lab Natl Nucl Data Ctr Upton NY 11973 USA;

Florida State Univ Dept Phys Tallahassee FL 32306 USA;

Univ Maryland Dept Chem &

Biochem College Pk MD 20742 USA;

Vanderbilt Univ Dept Phys Nashville TN 37235 USA;

Argonne Natl Lab Div Phys Argonne IL 60439 USA;

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正文语种 eng
中图分类原子核物理学、高能物理学;
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gamma-soft Ba-146 and the role of nonaxial shapes at N approximate to 90

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