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Measurement of the alpha ratio and (n, gamma) cross section of U-235 from 0.2 to 200 eV at n_TOF

Balibrea-Correa, J. and Mendoza, E. and Cano-Ott, D. and Gonzalez, E. and Capote, R. and Krticka, M. and Altstadt, S. and Andrzejewski, J. and Audouin, L. and Becares, V. and Barbagallo, M. and Becvar, F. and Belloni, F. and Berthoumieux, E. and Billowes, J. and Boccone, V. and Bosnar, D. and Brugger, M. and Calviani, M. and Calvino, F. and Carrapico, C. and Cerutti, F. and Chiaveri, E. and Chin, M. and Colonna, N. and Cortes, G. and Cortes-Giraldo, M. A. and Diakaki, M. and Domingo-Pardo, C. and Dressler, R. and Duran, I. and Eleftheriadis, C. and Ferrari, A. and Fraval, K. and Furman, V. and Goebel, K. and Gomez-Hornillos, M. B. and Ganesan, S. and Garcia, A. R. and Giubrone, G. and Goncalves, I. F. and Goverdovski, A. and Griesmayer, E. and Guerrero, C. and Gunsing, F. and Heftrich, T. and Hernandez-Prieto, A. and Heyse, J. and Jenkins, D. G. and Jericha, E. and Kaeppeler, F. and Kadi, Y. and Karadimos, D. and Katabuchi, T. and Ketlerov, V. and Khryachkov, V. and Kivel, N. and Koehler, R. and Kokkoris, M. and Kroll, J. and Lampoudis, C. and Langer, C. and Leal-Cidoncha, E. and Lederer, C. and Leeb, H. and Leong, L. S. and Lerendegui-Marco, J. and Losito, R. and Mallick, A. and Manousos, A. and Marganiec, J. and Martinez, T. and Massimi, C. and Mastinu, P. and Mastromarco, M. and Mengoni, A. and Milazzo, P. M. and Mingrone, F. and Mirea, M. and Mondelaers, W. and Paradela, C. and Pavlik, A. and Perkowski, J. and Plompen, A. J. M. and Praena, J. and Quesada, J. M. and Rauscher, T. and Reifarth, R. and Riego-Perez, A. and Robles, M. and Rubbia, C. and Ryan, J. A. and Sabate-Gilarte, M. and Sarmento, R. and Saxena, A. and Schillebeeckx, P. and Schmidt, S. and Schumann, D. and Sedyshev, P. and Tagliente, G. and Tain, J. L. and Tarifeno-Saldivia, A. and Tarrio, D. and Tassan-Got, L. and Tsinganis, A. and Valenta, S. and Vannini, G. and Variale, V. and Vaz, P. and Ventura, A. and Vermeulen, M. J. and Vlachoudis, V. and Vlastou, R. and Wallner, A. and Ware, T. and Weigand, M. and Weiss, C. and Wright, T. and Zugec, P.. (2020) Measurement of the alpha ratio and (n, gamma) cross section of U-235 from 0.2 to 200 eV at n_TOF. Physical Review C - Nuclear Physics , 102 (4). 044615.

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Official URL: https://edoc.unibas.ch/80182/

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Abstract

We measured the neutron capture-to-fission cross-section ratio (alpha ratio) and the capture cross section of U-235 between 0.2 and 200 eV at the n_TOF facility at CERN. The simultaneous measurement of neutron-induced capture and fission rates was performed by means of the n_TOF BaF2 Total Absorption Calorimeter (TAC), used for detection of gamma rays, in combination with a set of micromegas detectors used as fission tagging detectors. The energy dependence of the capture cross section was obtained with help of the Li-6(n, t) standard reaction determining the n_TOF neutron fluence; the well-known integral of the U-235(n, f) cross section between 7.8 and 11 eV was then used for its absolute normalization. The alpha ratio, obtained with slightly higher statistical fluctuations, was determined directly, without need for any reference cross section. To perform the analysis of this measurement we developed a new methodology to correct the experimentally observed effect that the probabilities of detecting a fission reaction in the TAC and the micromegas detectors are not independent. The results of this work have been used in a new evaluation of U-235 performed within the scope of the Collaborative International Evaluated Library Organisation (CIELO) Project, and are consistent with the ENDF/B-VIII.0 and JEFF-3.3 capture cross sections below 4 eV and above 100 eV. However, the measured capture cross section is on average 10% larger between 4 and 100 eV.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0556-2813
e-ISSN:1089-490X
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:29 Apr 2021 12:47
Deposited On:29 Apr 2021 12:47

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