Measurements of Neutron Capture Cross Sections of 112Sn and 118Sn with J-PARC/MLF/ANNRI

The neutron-capture cross sections of 112Sn and 118Sn were measured by the time-of-flight method in the energy range from 10 meV to 2 keV with an array of germanium detectors in ANNRI at J-PARC. The preliminary results of the neutron-capture cross sections for 112Sn and 118Sn were obtained by normalizing the relative cross sections to the thermal cross section measured by Krane and to the evaluated value of JENDL-4.0 at the 47.05-eV resonance, respectively. Twelve new resonances for 112Sn were observed, whereas the 21.02-, 40.38- and 166-eV resonances for 112Sn and the 289-eV resonance for 118Sn which are listed on JENDL-4.0 and/or ENDF/B VII.1 were not observed. The prompt γ-ray distributions gated at the 112Sn and 118Sn resonances were obtained. Twenty-three new prompt γ-ray emissions were observed in the 112Sn (n,γ) reactions.