The structure of the parity-doublet bands in ²³¹Pa

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• 作者：Levon ; A.I. ; de Boer ; J. ; Graw ; G. ; Kvasil ; J. ; Loewe ; M. ; Valnion ; V.D. ; Wü ; rkner ; M. ; Baltzer ; H. ; et. al.
• 关键词：NUCLEAR REACTIONS ; ²³¹Pa(d ; d&prime ; ) ; E = 27 MeV ; ²³¹Pa(p ; p&prime ; ) ; E = 11 MeV ; ²³²Th(p ; 2nγ ; ) ; E = 14 MeV ; Coulomb excitation by ³²S ; E = 145 MeV ; measured E_d ; E_p ; E_γ ; ; I
• 刊名：Nuclear Physics A
• 出版年：1996
• 期刊代码：44_03759474
• 类别：ph
• 出版时间：February 19, 1996
• 卷：598
• 期：1
• 页码：11-46
• 文件大小：1.64 M

摘要

The level structure of ²³¹Pa was investigated by means of the ²³¹Pa(d,d′), ²³¹Pa(p,p′) and²³² Th(p,2nγ) reactions and Coulomb excitation and by means of the electron-capture decay of²³¹ U to ²³¹Pa. Two low-lying opposite-parity bands based on the Kπ = ^± states were observed up to spins ⁻ and ⁺, respectively. From the branching ratios the intrinsic electric dipole moment was determined to be D₀ 0.04 e·fm. Weak Coulomb excitation of other bands was observed. The structure of ²³¹Pa is compared to that of ²²⁹Pa, in particular with regard to octupole effects. The level scheme and transition intensities in Coulomb excitation are analyzed in the framework of the quasiparticle + phonon model.