Precision electron-gamma spectroscopic measurements in 75As
Department of Physics, Sri Sathya Sai Institute of Higher Learning, 515 134, Prasanthinilayam, India
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Accepted: 12 September 2005
Published online: 26 October 2005
The decay of 75Se to levels of 75As has been studied using an HPGe detector for gamma-ray and a mini-orange electron spectrometer for conversion electron measurements. We identify 38 transitions in this decay, including 18 gamma rays and 16 conversion electron lines reported for the first time. New results also include E2 multipolarity assignment for the 81 keV transition, M1 assignment to three newly observed transitions and M1 + E2 for the 617 keV transition. A revised 75As level scheme is constructed using the Ritz combination principle through the computer code GTOL. While confirming the existence of 10 well-established levels, two levels at 587 and 859 keV are newly placed into the decay scheme of 75Se. The interpretation of the observed levels in terms of various theoretical approaches is briefly discussed. The newly placed 586.8 keV 1/2- and 859.9 keV 1/2+ levels are studied in the light of the Interacting Boson-Fermion Model.
PACS: 23.20.Lv γ transitions and level energies – / 23.20.Nx Internal conversion and extranuclear effects – / 27.60.+j 90 ⩽ A ⩽ 149 –
© Società Italiana di Fisica and Springer-Verlag, 2005