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arXiv 1112.3192nucl-thnucl-ex
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稳定核~(84)Sr的高自旋态和能级结构

High-Spin States and Level Structure in Stable Nucleus 84Sr

Shuifa Shen, Xuzhong Kang, Guangbing Han, Shuxian Wen, Yupeng Yan, Shiwei Yan, Xiaoguang Wu, Lihua Zhu, Guangsheng Li, Chuangye He

摘要:

在75 MeV束流能量下,通过反应70 Zn(18 O,4 n)84 Sr布居了84 Sr的高自旋态。用八个反康普顿HPGe探测器和一个平面HPGe探测器测量了激发函数、γ-γ符合、取向态的方向相关(DCO)比和γ跃迁强度。在此基础上,建立了一个新的84 Sr能级方案,确定了12个新态和近30个新的γ跃迁。正宇称态的新的水平计划进行了比较,从投影壳模型(PSM)的框架内的计算结果。将一个负宇称带扩展到自旋I=19,发现在高自旋态,γ跃迁能量表现出信号交错的性质。负宇称带能级与变形组态混合壳模型(DCM)计算结果吻合得很好。

英文摘要:

High-spin states of 84Sr were populated through the reaction 70Zn(18O, 4n)84Sr at 75 MeV beam energy. Measurement of excitation function, gamma-gamma coincidences, directional correlation of oriented states (DCO) ratios and gamma-transition intensities were performed using eight anticompton HPGe detectors and one planar HPGe detector. Based on the measured results, a new level scheme of 84Sr was established in which 12 new states and nearly 30 new gamma-transitions were identified in the present work. The positive-parity states of the new level scheme were compared with results from calculations in the framework of the projected shell model (PSM). One negative-parity band was extended to spin I=19 and it can be found that in the high-spin states the gamma-transition energies show the nature of signature staggering. The negative-parity band levels are in good agreement with the deformed configuration-mixing shell model (DCM) calculations.

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