Investigating Core Excitations in the $^{131}$Sn One-valence-hole Nucleus

Bottoni, S.; Iskra, Ł. W.; Leoni, S.; Fornal, B.; Bazzacco, D.; Gatti, L.; Blanc, A.; Bocchi, G.; Bracco, A.; Cieplicka-Oryńczak, N.; Crespi, F. C. L.; Jentschel, M.; Köster, U.; Michelagnoli, C.; Million, B.; Mutti, P.; Söldner, T.; Ur, C. A.; Urban, W.

doi:10.5506/aphyspolb.50.285

Cited by 5 publications

(10 citation statements)

References 16 publications

(17 reference statements)

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“…Overall, it appears that Ca isotopes provide a fundamental play ground for state-of-the-art theories, which, in this mass region, tend to converge to similar results, making Ca nuclei a cornerstone for a comprehensive description of nuclear structure. This work is also an important benchmark for the Hybrid Configuration Mixing Model, here discussed, which becomes a powerful tool to compute the complex structure of isotopes in heavier mass regions, such as the neutron-rich region around the doubly-magic 132 Sn nucleus [68,69]. Indeed, in these heavy systems, shell model calculations and ab initio methods have severe difficul-ties in dealing with collective excitations of the core, due to the diverging dimension of the model space, thus resulting, up to now, in a limited description of complex excitations.…”

Section: Discussionmentioning

confidence: 99%

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

Bottoni,

Cieplicka-Oryńczak,

Leoni

et al. 2020

Preprint

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We present recent results on the structure of the one-valence-particle 41 Ca and 49 Ca, and onevalence-hole 47 Ca, nuclei. The isotopes of interest were populated via the cold-neutron capture reactions 40 Ca(n,γ), 48 Ca(n,γ) and 46 Ca(n,γ), respectively. The experiments were performed at the Institut Laue-Langevin, within the EXILL campaign, which employed a large array of 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 41 Ca, 47 Ca, and 49 Ca, 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 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".

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Section: Discussionmentioning

confidence: 99%

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

Bottoni,

Cieplicka-Oryńczak,

Leoni

et al. 2020

Preprint

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“…to spin 17 and excitation energy of 6.17 MeV, with positive-parity states, above 10 + , expected to be dominated by particles in the high-j orbitals lying close to the Fermi surface, and corresponding to the π g 2 7/2 , and the νh −2 11/2 configurations [67]. Still at N = 80, in 131 Sb (with one proton and two neutron holes outside 132 Sn), a large fraction of the members of the π g 2 7/2 ν (h −1 11/2 d −1 3/2 ) and π g 2 7/2 νh −2 11/2 multiplets were observed combining information from β-decay and microsecond-isomer decay [68].…”

Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

“…5 (b) for single-particle energies. (Adapted from [36] and [54,55,58]) Strong transitions from 131,132 Sn and 133 Sb are marked by labels. (Adapted from [59])…”

Section: The 132 Sn Doubly Magic Shell Closurementioning

confidence: 99%

“…7, 132 Sn shows 2 + , 3 − and 4 + excitations below 5.3 MeV of collective nature (named "phonons"), plus other states of 1p-1 h character [36,54]. It follows that one-valence particle/hole nuclei such as 131 Sn, 133 Sb and 131 In, (being bound up to 5.2, 7.4 and 6.2 MeV, respectively and unlike 133 Sn with a neutron binding energy of only 2.4 MeV), are perfect cases for the investigation of particle/hole-core-coupled excitations, provided they can be populated with sufficient intensities. As shown in Fig.…”

Section: Couplings With Core Excitations Around the 132 Sn Shell Closurementioning

confidence: 99%

“…The HCM model has no free parameters and is self-consistent in the sense that both single-particle states and phonons come out of Hartree-Fock (HF) and Random Phase Approximation (RPA) calculations performed with the Skyrme SkX interaction [130]. In the case of 133 Sb and 131 Sn [55,131], the model is found to reproduce well the energy sequence of the highspin states observed experimentally, pointing to a fast evolution of the wave function composition, from collective to non-collective character, with increasing spin. In the case of 133 Sb, as indicated by the configurations reported in Fig.…”

Section: Couplings With Core Excitations Around the 132 Sn Shell Closurementioning

confidence: 99%

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Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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The paper reviews recent developments in $$\gamma $$ γ -ray spectroscopy of the neutron-rich fragments produced in nuclear fission. This subject has been an intensive area of study spanning more than five decades. Here we highlight key results and describe the evolution of the associated experimental techniques since the last review papers in 1995 (I. Ahmad and W.R. Phillips, Rep. Prog. Phys. 58(11), 1415 (1995); J. H. Hamilton et al., Prog. Part. Nucl. Phys. 35, 635(1995)). Research themes in nuclear structure will be explored along with the fission reaction mechanism and the links to nuclear astrophysics and applications.

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Low-spin particle-core and hole-core excitations in Ca41,47,49 isotopes studied by cold-neutron-capture reactions

Bottoni¹,

Cieplicka-Oryńczak²,

Leoni³

et al. 2021

Phys. Rev. C

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We present recent results on the structure of the one-valence-particle 41 Ca and 49 Ca nuclei and the one-valencehole 47 Ca nucleus. The isotopes of interest were populated via the cold-neutron-capture reactions 40 Ca(n, γ ), 48 Ca(n, γ ), and 46 Ca(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 41 Ca, 47 Ca, and 49 Ca, 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 41 Ca, 49 Ca, and 47 Ca 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."

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Investigating Core Excitations in the $^{131}$Sn One-valence-hole Nucleus

Cited by 5 publications

References 16 publications

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

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

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

Low-spin particle-core and hole-core excitations in Ca41,47,49 isotopes studied by cold-neutron-capture reactions

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