Low-spin particle-core and hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron-capture reactions - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Phys.Rev.C Année : 2021

Low-spin particle-core and hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron-capture reactions

S. Bottoni
  • Fonction : Auteur
N. Cieplicka-Oryńczak
  • Fonction : Auteur
S. Leoni
B. Fornal
G. Colò
  • Fonction : Auteur
P.F. Bortignon
  • Fonction : Auteur
G. Bocchi
  • Fonction : Auteur
D. Bazzacco
  • Fonction : Auteur
G. Benzoni
A. Blanc
  • Fonction : Auteur
A. Bracco
  • Fonction : Auteur
S. Ceruti
  • Fonction : Auteur
F.C.L. Crespi
  • Fonction : Auteur
E.R. Gamba
  • Fonction : Auteur
Ł.W. Iskra
  • Fonction : Auteur
B. Million
  • Fonction : Auteur
D. Mengoni
  • Fonction : Auteur
P. Mutti
  • Fonction : Auteur
Y. Niu
  • Fonction : Auteur
C. Porzio
  • Fonction : Auteur
B. Szpak
  • Fonction : Auteur
A. Türler
  • Fonction : Auteur
C.A. Ur
  • Fonction : Auteur
W. Urban
  • Fonction : Auteur

Résumé

We present recent results on the structure of the one-valence-particle Ca41 and Ca49 nuclei and the one-valence-hole Ca47 nucleus. The isotopes of interest were populated via the cold-neutron-capture reactions Ca40(n,γ), Ca48(n,γ), and Ca46(n,γ), respectively. The experiments were performed at the Institut Laue-Langevin, within the EXILL campaign, which employed a large array of high-purity germanium (HPGe) detectors. The γ decay and level schemes of these nuclei were investigated by γ-ray coincidence relationships, leading to the identification of 41, 10, and 6 new transitions in Ca41, Ca47, and Ca49, respectively. Branching ratios and intensities were extracted for the γ decay from each state, and γ-ray angular correlations were performed to establish a number of transition multipolarities and mixing ratios, thus helping in the spin assignment of the states. The experimental findings are discussed along with microscopic, self-consistent beyond-mean-field calculations performed with the hybrid configuration mixing model, based on a Skyrme SkX Hamiltonian. The latter suggests that a fraction of the low-spin states of the Ca41, Ca49, and Ca47 nuclei is characterized by the coexistence of either 2p-1h (two-particle–one-hole) and 1p-2h excitations, or couplings between single-particle or single-hole degrees of freedom and collective vibrations (phonons) of the doubly-magic “core.”

Mots clés

Dates et versions

hal-03098866 , version 1 (05-01-2021)

Identifiants

Citer

S. Bottoni, N. Cieplicka-Oryńczak, S. Leoni, B. Fornal, G. Colò, et al.. Low-spin particle-core and hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron-capture reactions. Phys.Rev.C, 2021, 103 (1), pp.014320. ⟨10.1103/PhysRevC.103.014320⟩. ⟨hal-03098866⟩
59 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More