Abstract
A computer program TRANSEC based on Satchler theory has been developed for the theoretical calculation of the differential cross sections for the production of gamma rays in (n, n′ γ) reactions. The code is sufficiently versatile to take into account multiple exit channels, gamma-ray cascades, mixed multipolarities and an arbitrary number of sets of transmission coefficients. Comparisons between the experimental angular distributions and the theoretically calculated distributions lead to information regarding the level spins and the mixing ratios of the various gamma-ray transitions. The predictions of the Satchler theory are in excellent agreement with the experimental cross sections measured for the 24Mg, 26Mg, 27Al, 28Si, 40Ar, 40Ca, 54Fe, 56Fe, 59Co, 89Y and 208Pb nuclei. This method has been used for the assignment of level spins in the 27Al, 40Ar, 59Co and 89Y nuclei. The sensitivity of the distributions and the cross sections to the assumed parities of the nuclear levels has also been investigated.
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