Proton-neutron interaction at N congruent to Z - First observation of the T-z=1 nucleus Pd-94(46)48 in-beam

The neutron deficient nucleus Pd-94 was identified and studied for the first time by in-beam spectroscopy. An I-pi=(14(+)) isomer with t(1/2)=0.8 (2) mu s was observed in a recoil catcher setup inside the multi-detector gamma-array OSIRIS. Filter detectors for neutrons and charged particles were used to identify the (2p2n) exit channel of the reaction Ni-58+(40) Ca, populated with only 0.06% of the total evaporation residue cross section. The structure of the isomer is discussed within the frame work of shell model calculations in the (p(1/2),g(9/2)) model space with emphasis on the g(9/2)(2) T=0, I=1,9 ''pairing'' two-body matrix elements.