Shape of thePr143Beta Spectrum

Abstract

Small deviations from the statistical shape which has previously been reported for Pr 143 might be expected from a theoretical prediction for such a once-forbidden nonunique transition. The spectrum was investigated with greater precision and in greater detail than in past studies, with magnetic and scintillation spectrometers. The spectrum is found to exhibit small deviations from a statistical shape. The spectrum can be fitted with a once-forbidden, nonunique shape factor.

Internal bremsstrahlung from Pr-143

“…The 143pr was extracted from the cerium (the chief contaminations being 143Ce (33 h) and 14aCe (33 days)) and other possible traces of rare earths by carrying out mass separation [19].…”

Li6Plus Neutron Configuration inLi7

“…7,8 To describe briefly, what we do is to separate the total energy into two parts: the interaction energy between the clusters and the internal energies of the clusters. To calculate these energies we use the Serber force given by Eq.…”

“…4 might arise from a contaminant in their experiment. In view of this conflicting information, it thus seems worthwhile to carry out a theoretical calculation to determine whether a reasonable nucleon-nucleon interaction could allow for the formation of such a positive parity state around this excitation energy in Li 7 and Be 7 .…”

Mean Lifetimes of the First Excited States ofLi7andNa23by Reson

“…6 Certain improvements on the original design have been made, and these have been discussed in previous papers. [7][8][9] In addition, two other changes should be mentioned. First, the main defining baffles were replaced by rg-in.-thick Ta baffles to further minimize any scattering from the baffle edges.…”