Structure of 22N and the N = 14 subshell.

Authors :: Rodríguez-Tajes, C.
Cortina-Gil, D.
Álvarez-Pol, H.
Aumann, T.
Benjamim, E.
Benlliure, J.
Borge, M. J. G.
Caamaño, M.
Casarejos, E.
Chatillon, A.
Chulkov, L. V.
Eppinger, K.
Faestermann, T.
Gascón, M.
Geissel, H.
Gernhäuser, R.
Jonson, B.
Kanungo, R.
Krücken, R.
Kurtukian, T.
Source :: Physical Review C: Nuclear Physics. Jun2011, Vol. 83 Issue 6, p64313:1-64313:4. 4p.
Publication Year :: 2011
Abstract: One-neutron knockout data for 18-22N are analyzed in the eikonal approximation of the Glauber model. The role of the s-d shell and the crossing of the N = 14 neutron subshell are discussed. Of particular interest is the nucleus 22N, where the knockout data provide a sensitive experimental test for a possible halo structure of its ground state. The observation of a narrow momentum distribution of the 21N fragments, together with an essential 1s1/2 contribution needed to describe the observed longitudinal-momentum distribution, allow the firm conclusion that the ground state of 22N is a well-developed nuclear halo. The results also show that the N = 14 subshell in 22N is somewhat reduced as compared to that of 23O. [ABSTRACT FROM AUTHOR]