On the decay of 48Sc and 48V

Abstract

Synopsis The spin assignments of the known levels in 48 Ti excited in the decay of 48 Sc and 48 V have been checked by angular correlation and conversion coefficient measurements. The spin and parity of the 3.24 MeV level were uniquely determined as 4+. The γ -ray energies were found to be 986 ± 3 ( γ 1), 1040 ± 3 ( γ 2), 1314 ± 4 ( γ 3) and 2253 ± 15 ( γ 4) keV, the end points of the negaton and positon spectra in 48 Sc and 48 V 654 ± 7 and 698 ± 4 keV and the decay energies of these nuclides 3994 ± 9 and 4020 ± 7 keV respectively. The intensity of a possible 940 keV γ -ray suggested by earlier coincidence measurements is found to be smaller than 5%. Positon decay occurs in (55.6 ± 0.8) % of the 48 V transitions; this value is in agreement with theoretical predictions by Zweifel if no 940 keV γ -ray occurs. The half-life of 48 V was measured as 16.15 ± 0.17 days.