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Carroll, R. J.*; Podolyk, Zs.*; Berry, T.*; Grawe, H.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; Brunet, M.*; Creswell, J. R.*; et al.
Physical Review Letters, 125(19), p.192501_1 - 192501_6, 2020/11
被引用回数:12 パーセンタイル:62.27(Physics, Multidisciplinary)The decay of
Hg into the one-proton hole, one neutron-particle
Tl
nucleus was investigated at CERN-ISOLDE. Shell-model calculations describe well the level scheme deduced, validating the proton-neutron interactions used, with implications for the whole of the
,
quadrant of neutron-rich nuclei. While both negative and positive parity states with spin 0 and 1 are expected within the
window, only three negative parity states are populated directly in the
decay. The data provide a unique test of the competition between allowed Gamow-Teller and Fermi, and first-forbidden
decays, essential for the understanding of the nucleosynthesis of heavy nuclei in the rapid neutron capture process. Furthermore, the observation of the parity changing
decay where the daughter state is core excited is unique, and can provide information on mesonic corrections of effective operators.
Berry, T. A.*; Podolyk, Zs.*; Carroll, R. J.*; Lic
, R.*; Grawe, H.*; Timofeyuk, N. K.*; Alexander, T.*; Andreyev, A. N.; Ansari, S.*; Borge, M. J. G.*; et al.
Physics Letters B, 793, p.271 - 275, 2019/06
被引用回数:6 パーセンタイル:46.80(Astronomy & Astrophysics)Gamow-Teller decay is forbidden if the number of nodes in the radial wave functions of the initial and final states is different. This
= 0 requirement plays a major role in the
decay of heavy neutron-rich nuclei, affecting the nucleosynthesis through the increased half-lives of nuclei on the astrophysical
-process pathway below both
= 50 (for
82) and
= 82 (for
126). The level of forbiddenness of the
= 1
1
0
transition has been investigated from the
decay of the ground state of
Hg into the single-proton-hole nucleus
Tl in an experiment at the ISOLDE Decay Station. From statistical observational limits on possible
-ray transitions depopulating the
0
state in
Tl, an upper limit of 3.9
10
% was obtained for the probability of this decay, corresponding to log
8.8 within a 95% confidence limit. This is the most stringent test of the
= 0 selection rule to date.