Spectroscopy around Ca-36

An experiment was performed to study excited states in neutron-deficient nuclei around Ca. After a first fragmentation of the primary beam, the one-neutron knockout reaction was used to produce Ca-36 ions from the 37 Ca secondary beam and in-beam gamma rays were measured. The energy of the first excited 21 state in 36 Ca and the cross section for the 1-neutron knock-out reaction from 37 Ca at approximate to 45 A MeV were obtained. The 2(+) energy in 36Ca is compared to the mirror nucleus S-36 to deduce information on the isospin dependence of the nuclear force near the proton drip line. Furthermore, for two other T-z = -2 nuclei, S-28 and Ar-32, the deexcitation of the first 2(+) states has been observed.