Weak gamma-ray transitions of 1·440 MeV and 1·460 MeV in the decay of207Bi

The single gamma-ray spectra of²⁰⁷Bi were measured with 32 c. c. Ge(Li) detector. Evidence of gamma transitions of energies 1·440 MeV and 1·460 MeV is found. The relative intensity of these lines has also been estimated by measuring their photopeak areas. There is no evidence of the weak 0·9 MeV gamma as reported earlier (Alburger D. E.,Sunyar A. W., Phys. Rev.99 (1955), 695;Jar Dine L. J., Phys. Rev.C 11 (1975), 1385).The authors are grateful to the Director of the Saha Institute of Nuclear Physics, Calcutta for providing the facilities to work with the Ge(Li) detector at the Institute. We wish to thank Professor B. B.Baliga of the Institute for valuable discussions. Our thanks are due to Professor B. P.Singh, Head of the Physics Department of Roorkee University, Roorkee, for providing us with the facilities to perform the coincidence measurements in his laboratory.