Neutron decay of deep hole states and isobaric analog states in 115Sn populated by the (3He,α) reaction at 102 MeV

Abstract

Neutron decay of excited hole states and isobaric analog states (IAS) populated by the 116Sn(3He,α) reaction at an energy of 102 MeV has been investigated. The α-particles were analysed in a magnetic spectrograph positioned at 1.4° and detected with a multiwire drift chamber. Excitation energies in 115Sn up to 23 MeV were studied. An array of neutron detectors was positioned around the target at angles ranging from 68° to 209°. The neutron data were analysed in terms of decay into final states, using statistical model calculations as a tool to extract lower limits of nonstatistical decay. Nonstatistical decay was observed from states up to an excitation energy of about 18 MeV. The neutron emission of the IAS is compatible with 100% statistical decay.