The decay of 57Ni

Single-Particle and Core-Coupled States inCo57from the Decay ofNiGatrousis1, Meyer2, Mann3 et al. 1969Phys. Rev.36020View full textAdd to dashboardCite

“…The latter is a study of the 57 Ni decay using a Ge(Li) detector system with somewhat poorer resolution than the detectors used at Livermore. Although our results are in general agreement with the findings of Lingeman et al 7 some disagreement exists with respect to the interpretation of low-intensity high-energy transitions and the assignment of levels. In addition, a number of low-energy cascades observed in the present study would not be observed in Ge(Li) systems with intense Compton continua.…”

“…Lingeman and co-workers 7 have observed several of the same excited states we observed and assigned spins and parities on the basis of decay and reaction data. Our conclusions on the 1757.6-keV state disagree with Lingeman's, which favor a f~ assignment.…”

“…No evidence was found for a level at 1.59 MeV as reported by Chilosi et at* and we can find no support for levels at 1.46, 1.59, and 2.62 MeV STATES OF "Co 7 We differ with the latter study, however, in that we find no evidence for a level at 3151 keV. The information from the nuclear reaction studies and our accurate 7-ray energy data were relied on almost exclusively in constructing the present decay scheme.…”

“…In addition, a number of low-energy cascades observed in the present study would not be observed in Ge(Li) systems with intense Compton continua. A summary of the recent results by Lingeman et al 7 is shown in Table I, together with the recent information on low-lying excited states of 67 Co obtained by Piluso et al 5 in their studies of the /3 + decay of 67 Ni.…”

“…This doublet has been suggested in the reaction work, the 56 Fe(/>, 77) reaction exciting a state at 1921±20 keV with 7 T =f~ and the 58 Ni(*,o:) reaction a state at 1890d=15 keV with /*=f~\ Indeed, a doublet at 1900 keV has been indicated in the recent 54 Fe(a, p) measurements. As pointed out by Lingeman et at., 7 a, spin of less than | for the 1919.5-keV state would require the (unobserved) stopover transitions to the 1377.6-and 1504.7-keV levels to be hindered by ~10 4 and ~10 3 , respectively. This argument is not so significant for the state at 1896.5 keV since here, in contrast to the 1919.5-keV state, the level is populated very weakly and a hindrance of only ~10 would account for our failure to detect the stopover transitions.…”