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SUMMARY:Nuclear structure of neutron-rich Ge isotopes
DTSTART;VALUE=DATE-TIME:20251119T171500Z
DTEND;VALUE=DATE-TIME:20251119T173000Z
DTSTAMP;VALUE=DATE-TIME:20260421T175437Z
UID:indico-contribution-29016@indico.ific.uv.es
DESCRIPTION:Speakers: Pablo González-Tarrío Vicente (Universidad Complut
 ense de Madrid)\n**Abstract**\n\nThe region near ${^{78}\\mathrm{Ni}}$ is 
 crucial for nuclear structure studies\, as it lies around a doubly-magic s
 hell closure ($Z = 28$\, $N = 50$)\, making it an ideal testing ground for
  shell evolution and the interplay between single-particle and collective 
 effects. Currently\, many experimental and theoretical efforts are dedicat
 ed to investigating this region of the nuclear chart [1-3]\, aiming to und
 erstand the robustness of nuclear shells far from stability and the emerge
 nce of collective effects as nucleons are added. The interaction among val
 ence nucleons may be capable of attenuating the magic nature of a nucleus 
 very close to shell closures [4]. From this perspective\, isotopes of Ge (
 $Z = 32$)\, could be of significant interest to understand the evolution o
 f the $N = 50$ gap.\n\nIn the recent IS771 experimental campaign\, neutron
 -rich Ge isotopes were investigated via decay spectroscopy at the ISOLDE D
 ecay Station (ISOLDE\, CERN) using very neutron-rich Ga beams\, produced u
 sing the PSB protons impinging on a proton-to-neutron converter to fission
  a thick $\\mathrm{UC}_x$ target. High production yields were achieved for
  isotopes such as ${^{83-85}\\mathrm{Ga}}$ [5]\, populating ${^{83-85}\\ma
 thrm{Ge}}$ through $\\beta$-decay and $\\beta$-delayed neutron emission. T
 he calculated yields for the different decays of this experiment were cons
 istent with previous measurements.\n\nThe high yields together with the sp
 ectroscopic capabilities of the ISOLDE Decay Station\, equipped with 10 HP
 Ge detector clovers in a compact geometry\, enabled a significant expansio
 n of previous knowledge\, including the  identification of new transitions
  and levels\, as well as the ability to carry out angular correlations mea
 surements for spin-parity assignments. In addition\, two $\\mathrm{LaBr}_3
 $ and three beta detectors were used to perform lifetime measurements of e
 xcited states in the subnanosecond range via fast-timing techniques.\n\nIn
  this contribution\, the current status of the analysis of the experiment 
 will be presented\, focusing on the obtained yields\, the extended level s
 chemes extracted through high-resolution $\\gamma$-ray spectroscopy and th
 e preliminary results for lifetime measurements.\n\n**References**\n[1] R.
  Yokoyama et al.\, $\\beta$-delayed neutron emissions from $N > 50$ galliu
 m isotopes\, Physical Review C **108** (2023) 064307.\n[2] K. Sieja et al.
 \, Laboratory versus intrinsic description of nonaxial nuclei above doubly
  magic ${^{78}\\mathrm{Ni}}$\, Physical Review C **88** (2013) 034327.\n[3
 ] C. Delafosse et al.\, Pseudospin Symmetry and Microscopic Origin of Shap
 e Coexistence in the ${^{78}\\mathrm{Ni}}$ Region: A Hint from Lifetime Me
 asurements\, Physical Review Letters **121** (2018) 192502.\n[4] A. Huck e
 t al.\, Beta decay of the new isotopes ${^{52}\\mathrm{K}}$\, ${^{52}\\mat
 hrm{Ca}}$\, and ${^{52}\\mathrm{Sc}}$\; a test of the shell model far from
  stability\, Physical Review C **31** (1985) 2226.\n[5] ISOLDE yield datab
 ase (development version)\, https://isoyields2.web.cern.ch/YieldDetail.asp
 x?Z=31.\n\nhttps://indico.ific.uv.es/event/8035/contributions/29016/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29016/
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