One-Neutron Removal Measurement Reveals O24 as a New Doubly Magic Nucleus
Kanungo, R. and Nociforo, C. and Prochazka, A. and Aumann, T. and Boutin, D. and Cortina-Gil, D. and Davids, B. and Diakaki, M. and Farinon, F. and Ge
Keywords
Breakup and momentum distributions, Spectroscopic factors and asymptotic normalization coefficients, Shell model, 20lt=Alt=38
Abstract
The first measurement of the momentum distribution for one-neutron removal from O24 at 920AMeV performed at GSI, Darmstadt is reported. The observed distribution has a width (FWHM) of 99±4MeV/c in the projectile rest frame and a one-neutron removal cross section of 63±7mb. The results are well explained with a nearly pure 2s1/2 neutron spectroscopic factor of 1.74±0.19 within the eikonal model. This large s-wave probability shows a spherical shell closure thereby confirming earlier suggestions that O24 is a new doubly magic nucleus.
