Transfer Reactions on Argon Isotopes

Juan Manfredi, Michigan State University

A spectroscopic factor (SF) quantifies the single-particle structure of a given state in a nucleus. The SFs of a nucleus can be probed using nuclear reactions and should be invariant regardless of what reaction probe is used. There is a discrepancy in extracted SFs between studies that use transfer reactions1 and those that use knockout reactions2. Resolving this discrepancy is important not only for understanding how SFs change across the isotopic chain (which reflects changes in single-particle structure and the influence of nucleon correlations), but also for properly comprehending the relevant nuclear reaction probes themselves. Kinematically complete measurements of the transfer reactions 34Ar(p,d) and 46Ar(p,d) were performed at the National Superconducting Cyclotron Laboratory. The same beam energy (70 MeV/u) was used as in a previous knockout measurement2 to account for energy dependence in the relevant optical potentials. Spectroscopic factors were extracted from measured angular distributions. Preliminary results will be presented. Findings from measurement of the two-neutron transfer reactions 34Ar(p,t) and 46Ar(p,t) will also be presented.

References:
1J. Lee, et al, Phys. Rev. Lett. 104 (2010) 112701.
2A. Gade et al., Phys. Rev. Lett. 93 (2004) 042501.

Abstract Author(s): J. Manfredi