热变形稀土核中的复合阻尼和转动阻尼

Compound and rotational damping in warm deformed rare-earth nuclei.

作者信息

Leoni S, Matsuo M, Bracco A, Benzoni G, Blasi N, Camera F, Grassi C, Million B, Paleni A, Pignanelli M, Vigezzi E, Wieland O, Døssing T, Herskind B, Hagemann G B, Wilson J, Maj A, Kmiecik M, Lo Bianco G, Petrache C M, Castoldi M, Zucchiati A, De Angelis G, Napoli D, Bednarczyk P, Curien D

机构信息

Dipartimento di Fisica, Universitá di Milano, INFN sezione di Milano, Via Celoria 16, 20133 Milano, Italy.

出版信息

Phys Rev Lett. 2004 Jul 9;93(2):022501. doi: 10.1103/PhysRevLett.93.022501. Epub 2004 Jul 7.

DOI:10.1103/PhysRevLett.93.022501

PMID:15323907

Abstract

The gamma decay in the quasicontinuum from selected configurations of the rotational nucleus 163Er has been measured with the EUROBALL array. A new analysis technique has allowed for the first time to directly measure the compound and rotational damping widths Gamma (micro) and Gamma (rot). Values of Gamma (micro) approximately 20 keV and Gamma (rot) approximately 200 keV are obtained in the spin region I approximately 30-40 variant Planck's over 2pi, in good agreement with microscopic cranked shell model calculations. A dependence of Gamma (micro) and Gamma (rot) on the K-quantum number of the nuclear states is also presented.

摘要

利用EUROBALL阵列测量了转动核163Er特定组态在准连续区的γ衰变。一种新的分析技术首次使得直接测量复合和转动阻尼宽度Γ(μ)和Γ(rot)成为可能。在自旋区域I≈30 - 40ћ（ћ为约化普朗克常数）中，得到了Γ(μ)约为20 keV和Γ(rot)约为200 keV的值，这与微观推转壳模型计算结果吻合得很好。还给出了Γ(μ)和Γ(rot)对核态K量子数的依赖关系。