Speaker
Description
The neutron number N=32 has been recently proposed to be a new magic number for neutron-rich nuclei far from stability, such as 52Ca. This statement relies on different experimental measurements, such as mass-measurements, high excitation energy for the first 2+ state of even-even nuclei and low B(E2) values. The calcium isotopic distribution is well documented, in addition with many theoretical calculations, with a strong influence of the closed proton core at Z = 20. Persisting - although weakened – shell effects are still observed for higher Z isotopic distributions, such as titanium or chromium isotopes, in competition with increasing collective effects. Very few data exist for Z lower than 20.
We will present an analysis of the one neutron removal reaction 50Ar(p,pn) in inverse kinematics performed at RIKEN with the liquid hydrogen target of the MINOS device, the DALI2+ array for detection of photons and the SAMURAI spectrometer. A first spectroscopy of 49Ar has been proposed for low-lying bound states and compared with state-of-the-art theoretical calculations. Differences from a closed shell nucleus such as 51Ca and importance of collective effects will be emphasized.
