Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV (CROSBI ID 697829)
Prilog sa skupa u zborniku | kratko priopćenje | međunarodna recenzija
Podaci o odgovornosti
Amaducci, S. ; ... ; Bosnar, Damir ; ... ; Žugec, Petar
n_TOF Collaboration
engleski
Measurement of the 235 U(n,f) cross section at n_TOF from thermal to 170 keV
The 235U(n, f) cross section plays a key role for nuclear physics due to its widespread use as a standard reference for neutron cross section measurements and for neutron flux measurements. Recent experimental data of the fission cross section have suggested the presence of discrepancies around 6–8% with respect to the most used libraries, precisely in the range between 10 keV and 30 keV. In order to shed light on this disagreement, an accurate measurement of the 235U(n, f) fission cross section has been performed at n_TOF facility @CERN, using the standard reactions 6Li(n, t) and 10B(n, α) as reference. A custom experimental setup based on a stack of silicon detectors sandwiched between pairs of 235U, 6Li and 10B targets, has been installed along the neutron beam line to intercept the same neutron flux, allowing the detection of the fission fragments and the products of the reference reactions at the same time. Such a technique allows calculation of the cross section via the “ratio method”, by normalizing the 235U(n, f) reaction yields with respect to the reference reactions and to the recommended data in the IAEA libraries ; in particular, the integral between 7.8 and 11 eV has been chosen. Accurate Monte Carlo simulations have allowed evaluation of the neutron absorption in the different layers, as well as the detection efficiency of each detector. The data are in excellent agreement with the standard values and highlight the overestimation of the 235U(n, f) cross section between 9 and 18 keV in the most recent libraries.
n_TOF, 235U, fission, neutron time of flight
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
Podaci o prilogu
2060011-1-2060011-9.
2020.
objavljeno
10.1142/S2010194520600113
Podaci o matičnoj publikaciji
International Journal of Modern Physics: Conference Series 50
Anna Erickson, Marianne Hamm
2010-1945
Podaci o skupu
Nepoznat skup
predavanje
29.02.1904-29.02.2096