Beta-gamma correlation measurements on Ir192

Bhattacherjee, S. K. ; Mitra, S. K. ; Jain, H. C. ; Padhi, H. C. (1967) Beta-gamma correlation measurements on Ir192 Physical Review, 159 (4). pp. 1056-1062. ISSN 0031-899X

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The β-γ directional correlation between β particles in the 536-keV group and the 605- and 612-keV γ rays in the decay of 72-day Ir192 has been measured at several β-ray energies. The measured correlation coefficient ε(W) rises from -0.074±0.015 at 185 keV to -0.096±0.010 at 255 keV and then starts falling; near the end-point energy the anisotropy is found to be very small. The large β-γ anisotrophy observed conclusively establishes that the parity of Ir192 is negative. Attempts have been made to extract information about the relevant matrix-element ratios governing the 536-keV β transition. The β-γ directional correlation between β particles in the outer group of 669-keV and the 469-keV γ ray (4--β4+-γ2+) has also been measured; it shows nearly isotropic correlation in the β energy region 400-650 keV. The β-γ circular-polarization correlation in the above cascade has also been measured. It is concluded that while large cancellation among the vector-type matrix elements is responsible for the observed energy dependence of the β-γ anisotropy in the 536-keV β group, the outer β group of 669 keV apparently satisfies the quasi-allowed approximation. The nature of the 785-keV (4+) and 921-keV (3+) states in Pt192 is discussed in the light of these findings.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:3507
Deposited On:12 Oct 2010 04:23
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