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

Publication Type
Journal Article
Year of Publication
Nociforo, C.
Prochazka, A.
Kanungo, R.
Aumann, T.
Boutin, D.
Cortina-Gil, D.
Davids, B.
Diakaki, M.
Farinon, F.
Geissel, H.
Gernhauser, R.
Janik, R.
Jonson, B.
Kindler, B.
Knobel, R.
Krucken, R.
Kurz, N.
Lantz, M.
Lenske, H.
Litvinov, Y. A.
Lommel, B.
Mahata, K.
Maierbeck, P.
Musumarra, A.
Nilsson, T.
Perro, C.
Scheidenberger, C.
Sitar, B.
Strmen, P.
Sun, B.
Szarka, I.
Tanihata, I.
Weick, H.
Winkler, M.
Name of Publication
Physical Review C
Date Published
Accession Number
ISBN Number

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 (approximate to 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 Al-33,Al-34,Al-35 has been studied and compared with shell model predictions. The inferred 2s(1/2) neutron occupancy in the Al-33 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 Al-34, similarly to Mg-33. The single-particle 1f(7/2) occupancy shows a gradual increase at N = 22. Correspondingly, a decrease of the 1d(3/2) strength has been observed.