FIPPS: Fission Product Prompt Gamma-Ray Spectrometer, a New High Efficiency HPGe Array for Nuclear Spectroscopy

摘要

Within the EXILL campaign a large and efficient cluster of Ge-detectors was installed around a very well collimated neutron beam. This has allowed carrying out rather complete spectroscopic studies close to the line of stability using the (n, gamma) reaction. Neutron rich isotopes were produced by neutron-induced fission on both ~(235)U and ~(241)Pu samples and prompt gamma spectroscopy was carried out. Isotope identification was based on triple gamma coincidences a partially known level scheme and the use of triple coincidences. Because of the high multiplicity coincidence, the sensitivity in the case of weak production yields was substantially reduced.