Extended p3/2 Neutron Orbital and the N=32 Shell Closure in Ca52

Enciu, M.; ..., ; Gašparić, Igor; ..., ; Zanetti, L. (2022) Extended p3/2 Neutron Orbital and the N=32 Shell Closure in Ca52. Physical Review Letters, 129 (26). ISSN 0031-9007

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Abstract

The one-neutron knockout from 52Ca in inverse kinematics onto a proton target was performed at similar to 230 MeV/nucleon combined with prompt 7 spectroscopy. Exclusive quasifree scattering cross sections to bound states in 51Ca and the momentum distributions corresponding to the removal of 1f7=2 and 2p3=2 neutrons were measured. The cross sections, interpreted within the distorted-wave impulse approximation reaction framework, are consistent with a shell closure at the neutron number N = 32, found as strong as at N = 28 and N = 34 in Ca isotopes from the same observables. The analysis of the momentum distributions leads to a difference of the root-mean-square radii of the neutron 1f7=2 and 2p3=2 orbitals of 0.61(23) fm, in agreement with the modified-shell-model prediction of 0.7 fm suggesting that the large root-mean-square radius of the 2p3=2 orbital in neutron-rich Ca isotopes is responsible for the unexpected linear increase of the charge radius with the neutron number.

Item Type:	Article
Uncontrolled Keywords:	one-neutron knockout; inverse kinematics; prompt γ spectroscopy; quasifree scattering; momentum distributions; distorted-wave impulse approximation; charge radius
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Depositing User:	Kristina Ciglar
Date Deposited:	04 May 2026 14:10
URI:	https://fulir.irb.hr:/id/eprint/11873
DOI:	10.1103/PhysRevLett.129.262501

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