Abstract
Recent results on the structure of 47Ca will be presented. The nucleus of interest was populated via the cold-neutron capture 46Ca(n,γ) reaction, on a rare 46Ca target, during the EXILL experimental campaign at the nuclear reactor of Institut Laue- Langevin in Grenoble. High-resolution γ-ray spectroscopy, performed with a composite array of HPGe detectors, enabled the identification of new transitions deexciting states between the neutron-capture level and the ground state. Experimental data will be compared with a novel microscopic theoretical model, currently under development, specifically designed to describe the low-lying structure of odd-mass nuclei with one valence particle/hole outside a spherical doubly-magic core, using the Skyrme effective interaction self-consistently.
Highlights
Calcium isotopes provide an excellent laboratory to investigate the properties of medium-heavy nuclei as well as the evolution of nuclear structure between doubly-closed-shell systems and the hardto-predict isospin-dependent features of neutron-rich nuclei [1,2,3,4]
The particular geometry of the γ array used in the EXILL experimental campaign made possible the study of γ-ray angular correlations at 0◦, 45◦ and 90◦ (e.g.[23,24,25]), the statistics collected in the present experiment was not enough to further characterize the observed γ rays in 47Ca
The results suggest that the ground state has a pure single-hole character, with the the wave function, whereas the 3/2− state is predicted f7−/12 configuration as a to be at 2869 keV of dominant excitation component energy and of to be a member of the ( f7−/12 ⊗ 2+) multiplet, arising from the coupling between a f7/2 hole and the 2+, quadrupole vibration of the 48Ca core
Summary
Calcium isotopes provide an excellent laboratory to investigate the properties of medium-heavy nuclei as well as the evolution of nuclear structure between doubly-closed-shell systems and the hardto-predict isospin-dependent features of neutron-rich nuclei [1,2,3,4]. A novel theoretical framework was developed, where Hartree-Fock and Random Phase Approximation calculations are combined to describe one-valence-proton/neutron-core coupled states in odd-A nuclei, considering both collective and non-collective core excitations and using the Skyrme effective interaction in a self-consistent way This model was successfully applied to interpret new experimental data on 49Ca and 133Sb [15, 16]. The particular geometry of the γ array used in the EXILL experimental campaign made possible the study of γ-ray angular correlations at 0◦, 45◦ and 90◦ (e.g.[23,24,25]), the statistics collected in the present experiment was not enough to further characterize the observed γ rays in 47Ca. the analysis is still on going in order to exclude the presence of additional weaker gamma-rays detected, especially in coincidence with the 2013-keV transition, which could possibly deexcite notyet-observed states in 47Ca
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