A study of the 58Ni(p, γ) 59Cu reaction

Abstract

Eleven resonances in the reaction 58Ni(p, γ) 59Cu have been investigated in the proton energy region 0.9 ≦ E p < 2.3 MeV. Gamma-ray angular distribution measurements on six resonances yield the following resonance spins (E p ( keV); J): (1376; 3 2 ), (1424; 3 2 ), (1833; 5 2 , 9 2 ), (1883; 3 2 ), (2238; 7 2 ), (2275; 5 2 ) . In addition spins of several low-lying levels were determined (or limited). They are E x ( keV); J): (1398; 7 2 ), (1865; 7 2 ), (1987; 5 2 ), (2265; 3 2 ), (2318; ( 1 2 )), (2324; 3 2 ), (2663; 5 2 , 9 2 ), (2707; 5 2 ), (2714; 7 2 ), (2927; 5 2 ), (3022; 5 2 , 7 2 ), (3025; ( 3 2 )), (3114; ( 5 2 )), (3130; ( 3 2 )), (3434; ( 5 2 )), (3438; ( 1 2 )), (3615; 3 2 ), (3663; 1 2 , 3 2 ), and (4181; 5 2 , 9 2 ) . Previously unreported states have been observed at E x = 2663, 2707, 3022, 3025, 3114, 3438, 3742 and 4181 keV. Branching ratios and multipole mixing ratios have been measured for the decay of several bound levels and these results are compared with recent theoretical calculations. Four of the resonance studied have been identified as isobaric analogues of low-lying 59Ni levels. As well, the γ-decay of the (presumed) 59Ni g.s analogue at 3905 keV has been observed. The log ƒ: t values for the β + decay of 59Cu to various 59Ni states are calculated from measured γ-widths in analogue state decay and are compared to values measured in β + decay.