keV Neutron Resonance Capture in Barium-137

Abstract

The neutron capture cross section of 137Ba has been measured to high resolution (AE/E ~ o· 2 %) below En = 60 keY. Average values of resonance parameters, extracted for resonances in the range 2·7 < En < 12 keY, are as follows: s-wave level spacing <D) = 380± 70 eV; s-wave radiative width <Tv). = 80±15meV; s-wave neutron strength function 104 So = 0'57±0'2; and p-wave neutron strength function 104 S1 = 0·45±0·2. The s-wave radiative width and the s-wave neutron strength function appear to be lower for 137Ba than for the other barium isotopes.