Beta decay
of 125Sb and level structures in 125Te
M SAINATH, K VENKATARAMANIAH and P C SOOD
Department of Physics, Sri
Sathya Sai Institute of Higher Learning,
Prashanthinilayam 515 134, India Department of Physics,
Banaras Hindu University, Varanasi 221 005, India
Department of Physics, G.N.D. University, Amritsar 143
005, India
MS received 7
November 1998; revised 24 May 1999
Abstract:
- The decay of 2.76y 125
Sb to levels of 125 Te has been
studied using an HPGe de-tector for gamma-ray and
a mini orange electron spectrometer for
conversion electron measure-ments. We identify 38
transitions in this decay, including 13 gamma
rays and 4 conversion electron lines being
reported for the first time. New results also
include E1 multipolarity assignments to 3 newly
observed transitions and M-shell conversion
coefficient for the 109 keV M4 transition. A
revised 125 Te level scheme is
constructed using Ritz combination principle.
While confirming the existence of 10 well
established levels below 700 keV excitation, we
introduce 3 other levels at 402.0, 538.6 and
652.9 keV. Interpretation of the observed levels
in terms of various theoretical approaches is
briefly discussed. The newly introduced 538.6 keV
(1/2 + ) and 652.9 keV (3/2 + ) levels are seen
as the two missing members of the (s1Ä 2
+ ) and (d3Ä 2 +
) sextuplet in the quasiparticle-phonon coupling
scheme.
- Keywords.
Radioactivity; 125 Sb beta decay; mini
orange; internal conversion coefficients;
multipo-larity; 125 Te level scheme.
- PACS Nos 23.20.Lv;
23.20.Nx; 27.60.+j
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