On absolute values of ?-widths for heavy spherical nuclei

Abstract

On the basis of the ordinary a-particle Saxon-Woods shell-model formfactors with configuration mixing the absolute values of a-widths are calculated for heavy spherical nuclei. The importance of the pairing and superfluid correlations is demonstrated for all favourable and semi-favourable a-transitions, including the same a-transitions in Po 21~ Po 2~, Bi 21~ and Po 212. The calculated a-widths are close to the corresponding experimental a-widths.

14 Particle Decay Study of Oriented Nuclei

“…Whereas the penetrability can easily be factored out, the description of the r L has been a long standing problem in nuclear physics. Only recently calculated absolute reduced widths can reproduce the experimental values within one order of magnitude [56][57][58].…”

“…NO measurements of the F-GT mixing ratio for the isospin-forbidden allowed I t = Ij decays of 56 Co and 58 Co were also carried out at Columbia University [11][12]. These ß-decay data yield small Fermi admixtures, as expected.…”

“…On the other hand, for X-ray detection the results are already more than one order of magnitude better. An energy resolution FWHM of about 7eV on the 5.9 keV line in 56 Fe has been recorded [100]. It is clear that in the near future these detectors might be used in a broad range of nuclear as well as solid state physics experiments, or wherever high resolution and/or low threshold is a prerequisite.…”

Surface alpha-clustering in the lead region

“…A number of papers [1][2][3][4] present a-decay constants for nuclei in the lead region calculated on the basis of configuration mixed wave functions. Considering a radius outside the nucleus, the reduced e-amplitude increases with the size of the configuration space.…”

“…Considering a radius outside the nucleus, the reduced e-amplitude increases with the size of the configuration space. Such a procedure may lead to an enhancement of the e-probability by several orders of magnitude [1,3,4]. These enhancement factors are sometimes interpreted as e-clustering in nuclei.…”