Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
12008602 | Physics Letters B | 2018 | 9 Pages |
Abstract
The first accurate measurements of the α-decay branching ratio and half-life of the IÏ=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, IÏ=1/2+ states in the neutron-deficient lead region. The findings shed light on the unexpected hindrance of the 1/2+â1/2+, 181Tlâg177Augα decay, which is explained by a mixing of Ï3s1/2 and Ï2d3/2 configurations in 177Aug, whilst 181Tlg remains a near-pure Ï3s1/2. This conclusion is inferred from the g factor of 177Aug which has an intermediate value between those of Ï3s1/2 and Ï2d3/2 states. A similar mixed configuration is proposed for the IÏ=1/2+ ground state of 179Au. This mixing may provide evidence for triaxial shapes in the ground states in these nuclei.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
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,