Abstract
The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.
Highlights
Counts Counts week ending 1 JULY 20160 −100 −50 0 50 100 Time (s)Time energy-loss information it was possible to determine the nuclear charge Z and the A=Z ratio
An aluminium degrader with adjustable thickness was used at S4 in order to slow down ions and implant them into a stack of double-sided silicon strip detectors called SIMBA [42]
Neutrons were detected using BEta-deLayEd Neutron (BELEN), which consisted of an array of 30 3He tubes embedded in a polyethylene matrix that served as moderator and shielding from the surrounding background neutrons
Summary
Counts Counts week ending 1 JULY 20160 −100 −50 0 50 100 Time (s)Time (μs) energy-loss information it was possible to determine the nuclear charge Z and the A=Z ratio. The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N ≳ 126.
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