Measurement of (n, p) cross-sections for shortlived products by 13.4-14.9 MeV neutrons

Abstract-The 28 {n, p)activation cross-sections that lead to short-lived nudei with half-lives.of between 20s and 18 min were measured in the energy range 13.4-14.9MeV using an activation method. The measured isotopes were 19F 28,29Si 37CI 50TI 52.53,54Cr 6O,62Ni 66,68Zn 86,88Sr 97Mo 101,102,104Ru, 104,10\ l08Pd, -107 Ag, 116Cd and 119,120Sn. Theʹ intenseʹ 14 MeV neutron source facility (OKT AVIAN) at Osaka University was used for irradiation. The v-rays emitted from the irradiated samples were measured with high-purity germanium (HPGe) detectors. All cross-section values were obtained relative to the stal1dard reaction cross-section of 27 Al (n, a) 24Na. The present results were compared with previous data and the evaluated data of lENDL-3 and ENDFjB-VI. Ten reactions were obtained at multi-pointenergies for the first time. By using intense neutron sources and making careful corrections, reliable results could be obtained. Most of the data obtained previously at multi-point-energies have shown reasonable agreement within 25%. In comparing 10 experimental reactions with the evaluated data, significant discrepancies of more than 25% were seen for three reactions