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."
Low-spin particle-core and hole-core excitations in Ca 41,47,49 isotopes studied by cold-neutron-capture reactions / S. Bottoni, N. Cieplicka-Orynczak, S. Leoni, B. Fornal, G. Colo, P.F. Bortignon, G. Bocchi, D. Bazzacco, G. Benzoni, A. Blanc, A. Bracco, S. Ceruti, F.C.L. Crespi, G. De France, E.R. Gamba, L.W. Iskra, M. Jentschel, U. Koster, C. Michelagnoli, B. Million, D. Mengoni, P. Mutti, Y. Niu, C. Porzio, G. Simpson, T. Soldner, B. Szpak, A. Turler, C.A. Ur, W. Urban. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 103:1(2021 Jan).
|Titolo:||Low-spin particle-core and hole-core excitations in Ca 41,47,49 isotopes studied by cold-neutron-capture reactions|
BOTTONI, SIMONE (Primo)
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||gen-2021|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevC.103.014320|
|Appare nelle tipologie:||01 - Articolo su periodico|