Energy levels of 14C

Abstract

The 9Be ( 6Li, p) 14C reaction has been studied using 20 MeV 6Li ions and the Penn multiangle spectrograph. Proton groups are reported corresponding to thirty excited states of 14C with E x < 18.2 MeV. The total cross section for formation of the six bound excited states, whose J π are known, is proportional to 2 J f + 1. Possible new spin assignments are suggested for several unbound levels of 14C, based on the 2 J f + 1 rule and a comparison of the experimental widths and widths predicted from neutron penetration of a centrifugal barrier.