Maxwellian Neutron Spectrum generation and Stellar Cross-Section measurements: measurement of the 197Au(n,γ) MACS
Metadatos
Mostrar el registro completo del ítemEditorial
IOP Publishing
Fecha
2018Referencia bibliográfica
P Jiménez-Bonilla [et al.]. Maxwellian Neutron Spectrum generation and Stellar Cross-Section measurements: measurement of the 197Au(n,γ) MACS. J. Phys.: Conf. Ser. 940 012044, 2018 . [doi :10.1088/1742-6596/940/1/012044].
Resumen
Maxwellian-averaged cross-sections (MACS) are needed as an input for the models
of stellar s- and r-processes nucleosynthesis. MACS can be obtained from activation
measurements, irradiating a sample with the neutron field generated by the 7Li(p,n)7Be reaction
at 1912 keV proton energy. At this energy, the neutron energy spectrum is close (R2≤0.9) to a
Maxwellian one of kT=25 keV. However, it was shown that shaping the energy of the incident
proton beam is possible to generate a neutron field with an energy spectrum much closer to a
real Maxwellian (R2>0.995), therefore avoiding or minimizing corrections in the MACS
calculation. We show a preliminary result of an experiment performed at JRC-IRMM (Geel) to
confirm our method. We have measured the MACS30 (kT=30 keV) of the 197Au(n,γ) reaction,
at CNA (Seville). We obtained 612 mb, in good agreement with the latest measurements.