Further measurements of the delayed neutron spectra of 93-97Rb and 143-145Cs

A further series of delayed-neutron energy spectral measurements for the fission product precursors 93-97Rb and 143-145Cs was made using the TRISTAN ISOL facility. The specific goal of these experiments was to improve the spectral definition for each of these isotopes both at the lower energies (below ∼20 keV) and at the higher energies (above ∼800 keV). To that end the following series of experiments was conducted: measurements using a H2 gas-filled proportional counter (2.6 Atm. pressure) with pulse-shape discrimination (between beta/gammas and neutron) at a gain setting of 0.3 keV/channel, measurements using a CH4 gas-filled proportional counter (5.3 Atm. pressure) at a gain setting of 8 keV/channel; and measurements using a 5.1-cm diameter x 1.27-cm thick BC-501 liquid scintillation detector with pulse-shape discrimination at a neutron gain setting of ∼20 keV/channel. 9 refs., 11 tabs