학술논문
Change in structure between the I = 1/2 states in 181Tl and 177,179Au
Document Type
article
Author
J.G. Cubiss; A.E. Barzakh; A.N. Andreyev; M. Al Monthery; N. Althubiti; B. Andel; S. Antalic; D. Atanasov; K. Blaum; T.E. Cocolios; T. Day Goodacre; R.P. de Groote; A. de Roubin; G.J. Farooq-Smith; D.V. Fedorov; V.N. Fedosseev; R. Ferrer; D.A. Fink; L.P. Gaffney; L. Ghys; A. Gredley; R.D. Harding; F. Herfurth; M. Huyse; N. Imai; D.T. Joss; U. Köster; S. Kreim; V. Liberati; D. Lunney; K.M. Lynch; V. Manea; B.A. Marsh; Y. Martinez Palenzuela; P.L. Molkanov; P. Mosat; D. Neidherr; G.G. O'Neill; R.D. Page; T.J. Procter; E. Rapisarda; M. Rosenbusch; S. Rothe; K. Sandhu; L. Schweikhard; M.D. Seliverstov; S. Sels; P. Spagnoletti; V.L. Truesdale; C. Van Beveren; P. Van Duppen; M. Veinhard; M. Venhart; M. Veselský; F. Wearing; A. Welker; F. Wienholtz; R.N. Wolf; S.G. Zemlyanoy; K. Zuber
Source
Physics Letters B, Vol 786, Iss , Pp 355-363 (2018)
Subject
Language
English
ISSN
0370-2693
Abstract
The first accurate measurements of the α-decay branching ratio and half-life of the Iπ=1/2+ ground state in 181Tl have been made, along with the first determination of the magnetic moments and I=1/2 spin assignments of the ground states in 177,179Au. The results are discussed within the complementary systematics of the reduced α-decay widths and nuclear g factors of low-lying, Iπ=1/2+ states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1/2+→1/2+, 181Tl→g177Aug α decay, which is explained by a mixing of π3s1/2 and π2d3/2 configurations in 177Aug, whilst 181Tlg remains a near-pure π3s1/2. This conclusion is inferred from the g factor of 177Aug which has an intermediate value between those of π3s1/2 and π2d3/2 states. A similar mixed configuration is proposed for the Iπ=1/2+ ground state of 179Au. This mixing may provide evidence for triaxial shapes in the ground states in these nuclei. Keywords: Nuclear physics, Decay spectroscopy, Laser spectroscopy, Nuclear deformation, Gold nuclei, Thallium nuclei