Premium
Zerfallsschema und Matrixelemente für den ß‐Übergang Cs 134 → Ba 134
Author(s) -
Daniel H.,
Hüfner J.,
Mehling O.
Publication year - 1963
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19634670109
Subject(s) - physics , asymmetry , atomic physics , matrix element , fermi gamma ray space telescope , spin (aerodynamics) , nuclear physics , condensed matter physics , quantum mechanics , particle physics , thermodynamics
The β decay Cs 134 → Ba 134 has been investigated with a double focusing β‐ray spectrometer and a β‐γ circular‐polarization correlation setup. The asymmetry parameter A of the correlation between the 656 keV β group and the following γ cascade was measured to be A = −0.13 → 0.02, in good agreement with a very recent value of Mann, Bloom, and Nagel. This A value implies a ratio X between Fermi and Gamow‐Teller contributions to the decay of X = 0.30 ± 0.03 0.04and so a definitely nonvanishing Fermi matrix element. The breakdown of the isotopic spin selection rule at an atomic number as large as that of Cs( Z = 55) is not surprising. The β transition is qualitatively discussed in shell model terms. Additional information is given for the disintegration scheme of Cs 134 . The level scheme of Ba 134 is discussed in terms of the vibrational model.