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Article Dans Une Revue Atomic Data and Nuclear Data Tables Année : 2023

Systematics of log $ft$ values for $β-$, and EC/$β$+ transitions

Résumé

This work is an update of the 1998 publication by B. Singh et al. [1] and reviews the log ft values for all the known β-decay branches (β-, β+/EC). Furthermore, an update of all Q-values (from AME2020 [2]), as well as a recalculation of all the log ft values (through BetaShape code [3, 4]) has been conducted using relevant data in the ENSDF database, as well as in newer literature. Only those cases, where the beta transition occurs between levels of single assignments of spins and parities have been considered in this review. Weak β branches of <1% intensity in complex decay schemes have generally been omitted. Out of a total of 26 318 β transitions extracted from the ENSDF database and current literature, data for only 4 039 β transitions survived the filtering criteria in the present review. The log ft values in β decay, spanning about 21 orders of magnitude, have been classified into allowed and forbidden categories according to the classification scheme of Konopinski [5]. All log ft values have been deduced using the BetaShape code with new developments presented in this study. A very few number of log ft values for very low-energy beta transitions (<5 keV) survived the cut criteria and are briefly discussed in terms of atomic overlap corrections. Also tabulated and briefly discussed are seven superallowed cases with ΔT=0, T$_z$ (parent)=-2, while a known case for $^{28}$S to $^{28}$P has been omitted as reliable EC/β+ feeding to the analog state in $^{28}$P cannot be assigned due to lack of adequate experimental and detailed data for this decay. Centroid, width, minimum and maximum values for each category have been deduced. Uncertainties have been estimated and are also given. For literature coverage in the present review, see discussion in text.
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Dates et versions

cea-04132509 , version 1 (19-06-2023)

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Steffen Turkat, Xavier Mougeot, Balraj Singh, Kai Zuber. Systematics of log $ft$ values for $β-$, and EC/$β$+ transitions. Atomic Data and Nuclear Data Tables, 2023, 152, pp.101584. ⟨10.1016/j.adt.2023.101584⟩. ⟨cea-04132509⟩
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