@Article{Yokoyama_etal2023,
author="Yokoyama, R. et al
and Tain, J. L.
and Algora, A.
and Agramunt, J.
and Domingo-Pardo, C.
and Morales, A. I.
and Rubio, B.
and Tolosa-Delgado, A.",
title="$\beta$-delayed neutron emissions from N > 50 gallium isotopes",
journal="Physical Review C",
year="2023",
publisher="Amer Physical Soc",
volume="108",
number="6",
pages="064307--15pp",
abstract="beta-delayed gamma-neutron spectroscopy has been performed on the decay of A=84 to 87 gallium isotopes at the RI-beam Factory at the RIKEN Nishina Center using a high-efficiency array of 3He neutron counters (BRIKEN). beta-2n-gamma events were measured in the decays of all of the four isotopes for the first time, which is direct evidence for populating the excited states of two-neutron daughter nuclei. Detailed decay schemes with the gamma branching ratios were obtained for these isotopes, and the neutron emission probabilities (P-xn) were updated from the previous study. Hauser-Feshbach statistical model calculations were performed to understand the experimental branching ratios. We found that the P-1n and P-2n values are sensitive to the nuclear level densities of 1n daughter nuclei and showed that the statistical model reproduced the P-2n/P-1n ratio better when experimental levels plus shell-model level densities fit by the Gilbert-Cameron formula were used as the level-density input. We also showed the neutron and gamma branching ratios are sensitive to the ground-state spin of the parent nucleus. Our statistical model analysis suggested J <= 3 for the unknown ground-state spin of the odd-odd nucleus Ga-86, from the I gamma(4(+)-> 2(+))/I-gamma(2(+)-> 0(+)) ratio of Ga-84 and the P-2n/P-1n ratio. These results show the necessity of detailed understanding of the decay scheme, including data from neutron spectroscopy, in addition to gamma measurements of the multineutron emitters.",
optnote="WOS:001159167500001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5939), last updated on Sun, 18 Feb 2024 19:02:15 +0000",
issn="2469-9985",
doi="10.1103/PhysRevC.108.064307",
opturl="https://doi.org/10.1103/PhysRevC.108.064307",
language="English"
}