Abstract : The spin-alignment of fragments produced in spontaneous and neutroninduced
fission reactions is found to be up to 40%. This amount of spin-alignment
allows the measurement of gyromagnetic factors of s isomeric states using the well
known TDPAD method. This observable is a very sensitive probe of the singleparticle
structure of nuclear states and frequently allows one to determine the
valence nucleon configuration. Isomers produced by spontaneous fission are difficult
to measure due to their low production rates and the ones produced by neutroninduced
fission and selected in a spectrometer could not be measured because one
needs to have fully stripped isotopes to preserve the spin-alignment in the vacuum.
The measurement performed at the RIKEN Nishina Center accelerator using
the abrasion-fission reaction of a 238U80+ beam at 345 MeV/u energy on the N=59
99mZr and 98mY will be presented. The obtained results show the opportunity to
perform gyromagnetic factors measurement of neutron-rich s-isomers produced by
the abrasion-fission reaction.
J.M. Daugas, F. Boulay, G.S. Simpson, Y. Ichikawa, D.S. Ahn, et al.. Spin-alignment in abrasion-fission reaction – g-factor measurement of isomeric states. 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei (FISSION 2017), Mar 2017, Chamrousse, France. ⟨in2p3-01503647⟩