Measurements of the neutron capture cross section of Am-243 with the ANNRI beamline, MLF/J-PARC

Kodama, Yu*; Katabuchi, Tatsuya*; Rovira Leveroni, G.   ; Kimura, Atsushi   ; Nakamura, Shoji  ; Endo, Shunsuke   ; Nakano, Hideto*; Sato, Yaoki*; Hori, Junichi*; Shibahara, Yuji*; Terada, Kazushi*

The measurements were performed using the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) beamline at the Japan Proton Accelerator Research Complex (J-PARC). An intense pulsed neutron beam was produced via spallation reaction in the mercury target of the Material and Life Science Experimental Facility by the 3-GeV proton beam of the J-PARC facility. A Time of Flight (TOF) method using a NaI(Tl) detector was employed in this measurements and a pulse-height weighting technique was used to derive a neutron capture yield. A sample of Am-243 with a mass of 38.14 mg (281.8 MBq) was used for the measurements. The neutron energy spectrum was obtained by using the 478 keV gamma-rays from the B(n,)Li reaction with a boron sample. A preliminary value for the capture cross section of Am-243 will be presented in the contribution.