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Low-spin particle/hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron capture reactions | | S. Bottoni
; N. Cieplicka-Oryńczak
; S. Leoni
; B. Fornal
; G. Colò
; 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
; Ł.W. Iskra
; M. Jentschel
; U. Köster
; C.Michelagnoli
; B.Million
; D.Mengoni
; P.Mutti
; Y.Niu
; C.Porzio
; G. Simpson
; T. Soldner
; B. Szpak
; A. Türler
; C.A. Ur
; W. Urban
; | | Date: |
9 Dec 2020 | | Abstract: | We present recent results on the structure of the one-valence-particle
$^{41}$Ca and $^{49}$Ca, and one-valence-hole $^{47}$Ca, nuclei. The isotopes
of interest were populated via the cold-neutron capture reactions
$^{40}$Ca(n,$gamma$), $^{48}$Ca(n,$gamma$) and $^{46}$Ca(n,$gamma$),
respectively. The experiments were performed at the Institut Laue-Langevin,
within the EXILL campaign, which employed a large array of HPGe detectors. The
$gamma$ decay and level schemes of these nuclei were investigated by
$gamma$-ray coincidence relationships, leading to the identification of 41,
10, and 6 new transitions in $^{41}$Ca, $^{47}$Ca, and $^{49}$Ca, respectively.
Branching ratios and intensities were extracted for the $gamma$ decay from
each state, and $gamma$-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 $^{41}$Ca,
$^{49}$Ca, and $^{47}$Ca nuclei is characterized by the coexistence of either
2p-1h and 1p-2h excitations, or couplings between single-particle/hole degrees
of freedom and collective vibrations (phonons) of the doubly-magic "core". | | Source: | arXiv, 2012.05162 | | Services: | Forum | Review | PDF | Favorites | |
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