About the correction matrix element effects on the first-forbidden beta decays of the155Eu nucleus

Abstract

Using an improved form of the Woods-Saxon nuclear model given by Gareev, Ivanova and Kalinikin, we calculated the absoluteft values for the one-quasiparticle transitions, starting from the ~-t-

Prospects of detection of relic antineutrinos by resonant absorption in electron capturing nuclei

“…This way we find the geometric factors favor the excited state of our system relative to the ground state by almost a factor of two. In the case of the A=155 system we see the opposite [15], i.e. the gs is favored by almost a factor of two.…”

“…The gs of 157 Tb is known to be of the type (3/2) + (3/2)[411] in the notation of [14], while the final states are (3/2) − (3/2)[521] and (5/2) − (3/2)[521], with the understanding that the first number is the spin-parity of the state, while the band head K is the second quantum number closed in parenthesis. We notice the similarity of these quantum numbers with those of (5/2) + (5/2)[413], (3/2) − (3/2)[521] and (5/2) − (3/2)[521] corresponding, respectively, to the ordinary beta decay of a neighboring system, namely the 155 Eu → 155 Gd, for which a nuclear calculation exists [15]. The comparison is illustrated in Fig.…”

“…with the understanding that the first number is the spin-parity of the state, while the band head K is the second quantum number closed in parenthesis. We notice the similarity of these quantum numbers with those of 32)[521] corresponding, respectively, to the ordinary beta decay of a neighboring system, namely the → Eu 155 155 Gd, for which a nuclear calculation exists [15]. Short of a detailed nuclear calculation, we will thus assume that the one body transition matrix elements are the same in both systems.…”