Determination of theTc (thermal n, ) Tc Reaction Cross Section from the prompt -Ray Yields

Furutaka, Kazuyoshi  ; Harada, Hideo   ; Raman, S.*

To determine thermal neutron capture cross section ofTc from the yields of prompt rays to the ground state ofTc, analysis of the existing data was done. -ray spectra were obtained with a coaxial intrinsic Ge detector positioned inside a NaI(Tl) annuls which is optically divided into two halves. The Ge detector was operated either in the Compton-Suppressed (CS) or the pair-spectrometer (PS) mode. Peak analysis was done for each ray observed both in the CS and the PS modes. Combining the results of the analyses in both modes, a total of 1100 rays were identified to be originated fromTc. From the obtained data a partial decay scheme was constructed, and six rays were identified as transitions to the ground state. From the intensities of these rays, the lower limit of the cross section is obtained as 21.370.62b.