Decay Schemes ofSm145andPm145

Total reaction cross sections from141Pr(α,α)141Pr elas

“…From the ratio between the calculated half-life T α,calc 1/2 = 2.49 × 10 16 s and the experimental partial half-life a preformation of P = 12.5±2.7 % is determined which is within the range of 10 − 20 % for the neighboring α emitters with N = 82 daughters. Although based on almost 50 years old data for the half-life [42] and the α branching [41], this result nicely confirms the close relationship between the various N = 82 nuclei including 144 Sm.…”

“…Although the α-decay half-lives vary over many orders of magnitude between 148 Gd, 146 Sm, and 144 Nd (with their N = 82-daughters 144 Sm, 142 Nd, and 140 Ce), it has been found in [39] that the preformation of the α-particle in the decaying nucleus is between about 10 and 20 % within this model. 145 Pm with its N = 82-daughter 141 Pr has a weak α-decay branch of (2.8 ± 0.6) × 10 −9 [36,40,41] which together with the half-life of T 1/2 = 17.7 ± 0.4 y [36,40,42] translates to a partial α-decay half-life T α 1/2 = (2.0 ± 0.4) × 10 17 s. The α-decay Q-value is Q α = 2322.2 ± 2.6 keV [36]. To repeat the α-decay calculations of [39] for 145 Pm, a real folding potential has been calculated at extremely low energies (labelled "α decay" in Table I), and the α-decay half-life has been calculated using the semi-classical model of [43].…”

Orbital electron capture by the nucleus

“…Coincidence measurements of this type (Method 16) for thedetermination of PK were first made by Brosi et al (1959), who observed the K x-ray spectrum gated by K-and L-conversion electrons and determined coincidence and singles intensities. The K-capture probability can be deduced from the relation…”

M�ssbauer conversion spectroscopy: Measurements on the first excited states of180, 182W and145Pm

“…A comparison with the lifetime measured by x-ray-7-coincidence [73] indicates a line broadening by a factor 2.5.…”