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Pré-Publication, Document De Travail Année : 2024

Simultaneous impacts of nuclear shell structure and collectivity on $\beta$-decay: evidence from $^{80}$Ga$_{49}$

G de Gregorio
  • Fonction : Auteur
R Mancino
  • Fonction : Auteur
L Coraggio
  • Fonction : Auteur
N Itaco.
  • Fonction : Auteur
M.N Harakeh
  • Fonction : Auteur
H. Al Falou
  • Fonction : Auteur
G Benzoni
  • Fonction : Auteur
V Bozkurt
  • Fonction : Auteur
M Ciemała
  • Fonction : Auteur
A Gottardo
  • Fonction : Auteur
K Hadyńska-Klęk
  • Fonction : Auteur
A Kankainen
  • Fonction : Auteur
T Martínez
  • Fonction : Auteur
P Napiorkowski
  • Fonction : Auteur
Yu.G Sobolev
  • Fonction : Auteur
S Stukalov
  • Fonction : Auteur

Résumé

The Gamow-Teller strength distribution covering the entire $\beta$-decay window, up to 10.312(4) MeV, of $^{80g+m}$Ga was measured for the first time in photo-fission of UC$_x$ induced by 50 MeV electron beam. The new data show significant enhancement in the high-energy region with a jump-structure. Simultaneously, the $\gamma$ de-exciting behavior of $\beta$-populated states presents a competition between de-excitation to 2$_1^+$ [$\beta_2$ = 0.155(9)] and to 2$_2^+$ [$\beta_2$ = 0.053$_{0.009}^{0.008}$)] in $^{80}$Ge. Based on these facts and combined with a realistic shell model calculation and systematic analysis of logft ratio between precursor $\beta$-decay to 2$_2^+$ and to 2$_1^+$ of Ga isotopes, we conclude that these phenomena evidence simultaneous impacts of nuclear shell structure and collectivity on B(GT) and its distribution and, therefore, the half-life of the precursor. These data prove that the nucleus as a multi-nucleon correlated quantum system reacts as a whole when $\beta$-decay occurs in contrast to simple single-particle excitation. Additionally, the comparison with the theoretical results evidence how challenging is the description of the experimental data obtained, and render this experimental outcome a sound test for the theoretical models.

Dates et versions

hal-04600964 , version 1 (04-06-2024)

Identifiants

Citer

R Li, D Verney, G de Gregorio, R Mancino, I Matea, et al.. Simultaneous impacts of nuclear shell structure and collectivity on $\beta$-decay: evidence from $^{80}$Ga$_{49}$. 2024. ⟨hal-04600964⟩
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