Beta-gamma directional correlation in La140

Bhattacherjee, S. K. ; Mitra, S. K. (1963) Beta-gamma directional correlation in La140 Physical Review, 131 (6). pp. 2611-2615. ISSN 0031-899X

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The directional correlation between the nonunique first-forbidden outer beta group of end-point energy 2.175 MeV in La140 and the 1.6-MeV cascade gamma ray in Ce140 has been measured at nine beta energies. The measured beta-gamma correlation coefficient ε ranges from (0.080±0.010) to (0.111±0.020) in the beta-energy interval 1.6 to 2 MeV. Taking account of the existing data on shape correction factor and also the beta-gamma circular polarization coefficient ω for θ=160° and W=4.2, the relevant first-forbidden beta-decay matrix-element ratios have been extracted; the ratios of the matrix elements are (in Kotani's notation) x=-0.33±0.15, u=-0.06±0.06, and Y=-1.50±0.20. Absolute values of the matrix elements were obtained from the observed ft value as |∫Bij|/R=(3.3±0.5)×10-2, |∫r|/R=(1.3±0.6)×10-2, |∫iδ×r|/R=(0.2±0.2)×10-2, |∫iα|=(4.3±1.5)×10-3. A cancellation among the vector-type matrix elements is apparently the cause of the deviation from the ξ approximation in this case.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:3509
Deposited On:12 Oct 2010 04:22
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