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-rays from slow neutron-induced fission of 
U with STEFFWright, T.*; 原田 秀郎; 木村 敦; 他121名*
European Physical Journal A, 60(3), p.70_1 - 70_11, 2024/03
被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)The average energy and multiplicity of prompt -rays from slow neutron-induced fission of U have been measured using the STEFF spectrometer at the neutron time-of-flight facility n_TOF. The individual responses from 11 NaI scintillators were corrected for multiple -ray interactions, prompt fission neutrons and background counts before being deconvolved to estimate the emitted spectrum of prompt fission -rays. The results give an average -ray energy 
of 1.71(5) MeV and multiplicity 
of 2.66(18) considering -rays emitted within the energy range from 0.8 to 6.8 MeV. The n_TOF data has a slightly larger and smaller than other recent measurements, however the product of the two is in agreement within the quoted uncertainties.
-ray emitter 
Al in massive stars; Study of the key Al(n, p) reactionLederer-Woods, C.*; 原田 秀郎; 木村 敦; 他121名*
Physical Review C, 104(2), p.L022803_1 - L022803_7, 2021/08
被引用回数：10 パーセンタイル：67.48(Physics, Nuclear)The Al(n,p)Mg reaction is the key reaction impacting on the abundances of the cosmic -ray emitter Al produced in massive stars and impacts on the potential pollution of the early solar system with Al by asymptotic giant branch stars. We performed a measurement of the Al(n,p)Mg cross section at the high-flux beam line EAR-2 at the n_TOF facility (CERN). We report resonance strengths for eleven resonances, nine being measured for the first time, while there is only one previous measurement for the other two. Our resonance strengths are significantly lower than the only previous values available. Our cross-section data range to 150 keV neutron energy, which is sufficient for a reliable determination of astrophysical reactivities up to 0.5 GK stellar temperature.
Ge(n,) cross section over a wide neutron energy range at the CERN n_TOF facilityDietz, M.*; 原田 秀郎; 木村 敦; 他121名*
Physical Review C, 103(4), p.045809_1 - 045809_8, 2021/04
被引用回数：11 パーセンタイル：67.48(Physics, Nuclear)The Ge(n,) cross section was measured for neutron energies up to 300 keV at the neutron time-of-flight facility n_TOF (CERN). The measurement was performed at the high-resolution beamline EAR-1, using an isotopically enriched Ge sample. The prompt capture rays were detected with four liquid scintillation detectors, optimized for low neutron sensitivity. We determined resonance capture kernels up to a neutron energy of 43 keV, and averaged cross sections from 43 to 300 keV. Maxwellian-averaged cross section values were calculated from kT = 5 to 100 keV, with uncertainties between 3.2% and 7.1%. The new results significantly reduce uncertainties of abundances produced in the slow neutron capture process in massive stars.
