One-neutron removal reactions on Al isotopes around the N=20 shell closure

C. Nociforo et al.
Phys. Rev. C 85, 044312 – Published 12 April 2012

Abstract

The one-neutron removal cross sections of neutron-rich Al isotopes and longitudinal momentum distributions of the residues have been measured for A=33 to 36 at relativistic energies (900 MeV/u). The inclusive data have been interpreted within the eikonal approximation. The evolution of the single-particle occupancy in the ground state of 33,34,35Al has been studied and compared with shell model predictions. The inferred 2s1/2 neutron occupancy in the 33Al ground-state wave function is 20% to 40% lower than the predicted one. The inclusive data do not exclude the presence of intruder states. Some intruder l=1 occupancy is found in 34Al, similarly to 33Mg. The single-particle 1f7/2 occupancy shows a gradual increase at N=22. Correspondingly, a decrease of the 1d3/2 strength has been observed.

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  • Received 4 October 2011

DOI:https://doi.org/10.1103/PhysRevC.85.044312

©2012 American Physical Society

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Vol. 85, Iss. 4 — April 2012

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