Study of photon strength functions of Pu-241 and Cm-245 from neutron capture measurements
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AuthorMendoza, E.; Ogállar Ruiz, Francisco; Porras Sánchez, José Ignacio; Praena Rodríguez, Antonio Javier; Torres Sánchez, Pablo
EPJ Web of Conferences 239, 01015 (2020). [https://doi.org/10.1051/epjconf/202023901015]
SponsorshipSpanish national company for radioactive waste management ENRESA, through the CIEMAT-ENRESA agreements on "Transmutacion de radionucleidos de vida larga como soporte a la gestion de residuos radioactivos de alta actividad"; Spanish Plan Nacional de I+D+i de Fisica de Particulas FPA2017-82647-P PGC2018-096717-B-C21; European Commission European Commission Joint Research Centre FP7-605203
We have measured the gamma-rays following neutron capture on Pu-240 and (CM)-C-244 at the n_TOF facility at CERN with the Total Absorption Calorimeter (TAC) and with C6D6 organic scintillators. The TAC is made of 40 BaF2 crystals operating in coincidence and covering almost the entire solid angle. This allows to obtain information concerning the energy spectra and the multiplicity of the measured capture gamma-ray cascades. Additional information is also obtained from the C6D6 detectors. We have analyzed the measured data in order to draw conclusions about the Photon Strength Functions (PSFs) of Pu-241 and (CM)-C-245 below their neutron separation energies. The analysis has been performed by fitting the PSFs to the experimental results, using the differential evolution method, in order to find neutron capture cascades capable of reproducing at the same time a great variety of deposited energy spectra.