Speaker
Simon Boissinot
(CEA Saclay)
Description
In the context of nuclear structure evolution with isospin towards the drip-line and local magic numbers phenomena, gamma-spectroscopy of nuclei located in the neutron-rich region around 54Ca is intensively investigated. Indeed, shell-model calculations using the GXPF1 interaction have indicated a new sub-shell closure at N=34. However, this is not confirmed experimentally by the 2+ excitation energy of 58Cr and 56Ti, and other shell-model interactions and mean-field calculations do not predict this sub-shell closure. The important role of 3-body force in explaining shell-closures is suggested by recent ab-initio calculations. Recently, the gamma-spectroscopy of 54Ca was measured at RIKEN to obtain evidence for the N=34 new sub-shell closure. The preliminary results do not indicate high 2+ excitation energy.
To further investigate this region, we propose to measure the gamma-spectroscopy of 52Ar and 56Ca. Since these nuclei are very neutron-rich, they are produced at few particles per second only, making their spectroscopy measurement challenging. The measurements in a reasonable time could be possible by using MINOS coupled to the high-efficiency gamma-spectrometer DALI2. In this talk we will discuss the feasibility of measuring 52Ar and 56Ca spectroscopy with the DALI2-MINOS setup.
Primary author
Simon Boissinot
(CEA Saclay)
