Beta and Gamma Spectroscopic Studies of <SUP>125</SUP>Sb

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  • Beta and gamma spectroscopic studies of 125Sb

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Abstract

The decay of 125Sb was investigated by using a Ge(Li) detector, NaI(Tl) and plastic scintillators. The decay scheme proposed by Mazets and Sergeenkov was confirmed. By combining the Ge(Li) data and their internal-conversion data, the K-conversion coefficients of all the gamma rays observed were deduced. Multipolarities of the 111.0, 172.0, 204.3, 208.9, 320.9 and 379.5 keV transitions were determined by the analysis of the re-measured gamma-gamma directional correlations. The 320.9, 117.3 and 111.0 transitions were found to have predominantly E1 contents that are “j-forbidden” in the j-j coupling scheme. The 444 keV beta–176.7 keV gamma delayed coincidences were measured and the half-life of the 321.1 keV state (9/2−) was found to be (8.7±0.8×10−10 sec. This infers that the 321.1 keV state has a significantly enhanced E2 transition moment. The experimental results obtained are compared with the theoretical predictions based on the pairing-plus-quadrupole force, the particle-plus-phonon, and the rational models.

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