학술논문
A new isomeric state in 218Pa
Document Type
article
Author
M.M. Zhang; H.B. Yang; Z.G. Gan; Z.Y. Zhang; M.H. Huang; L. Ma; C.L. Yang; C.X. Yuan; Y.S. Wang; Y.L. Tian; H.B. Zhou; S. Huang; X.T. He; S.Y. Wang; W.Z. Xu; H.W. Li; X.X. Xu; J.G. Wang; H.R. Yang; L.M. Duan; W.Q. Yang; S.G. Zhou; Z.Z. Ren; X.H. Zhou; H.S. Xu; A.A. Voinov; Yu.S. Tsyganov; A.N. Polyakov; M.V. Shumeiko
Source
Physics Letters B, Vol 800, Iss , Pp - (2020)
Subject
Language
English
ISSN
0370-2693
Abstract
The decay of 218Pa was investigated by means of α and γ spectroscopy. The nucleus was produced in the fusion reaction 40Ar+182W and separated in flight by the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure). The known α decays of 218Pa were measured with improved precision and newly assigned to be originating from the ground state, which clarified the ambiguities in their previous assignments. In addition, a new isomeric state in 218Pa decaying with α-particle energies of 9691(15) keV, 9595(21) keV and a half-life of 135−32+62 μs was identified. The spins and parities of the involved states were tentatively assigned on the basis of the systematic α-decay properties of the odd-proton N=127 isotones and shell model calculations. Keywords: Odd-proton N=127 isotones, Isomeric state, α-particle energy, Half-life, Shell model calculation, Spin and parity