Spin-alignment in abrasion-fission reaction – g-factor measurement of isomeric states

International audienceThe spin-alignment of fragments produced in spontaneous and neutroninducedfission reactions is found to be up to 40%. This amount of spin-alignmentallows the measurement of gyromagnetic factors of s isomeric states using the wellknown TDPAD method. This observable is a very sensitive probe of the singleparticlestructure of nuclear states and frequently allows one to determine thevalence nucleon configuration. Isomers produced by spontaneous fission are difficultto measure due to their low production rates and the ones produced by neutroninducedfission and selected in a spectrometer could not be measured because oneneeds to have fully stripped isotopes to preserve the spin-alignment in the vacuum.The measurement performed at the RIKEN Nishina Center accelerator usingthe abrasion-fission reaction of a 238U80+ beam at 345 MeV/u energy on the N=5999mZr and 98mY will be presented. The obtained results show the opportunity toperform gyromagnetic factors measurement of neutron-rich s-isomers produced bythe abrasion-fission reaction