Author(s)
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Manna, A (INFN, Trieste) ; Amaducci, S (INFN, Trieste) ; Barbagallo, M (INFN, Trieste) ; Colonna, N (INFN, Bari) ; Cosentino, L (INFN, LNS) ; Finocchiaro, P (INFN, LNS) ; Meo, S Lo (INFN, Trieste) ; Massimi, C (INFN, Trieste) ; Mastromarco, M (CERN) ; Milazzo, P M (INFN, Trieste) ; Mingrone, F (CERN) ; Tassan-Got, L (INFN, Trieste ; Natl. Tech. U., Athens ; Orsay, IPN) ; Vannini, G (INFN, Trieste) ; Ventura, A (INFN, Bologna) |
Abstract
| The neutron induced fission cross section of $^{235}$U is extensively used as a reference for neutron fluence measurements in various applications. At intermediate energies, the $^{235}$U(n,f) cross section plays an important role also for fundamental nuclear physics. Despite its widespread use, no data exist on neutroninduced fission of $^{235}$U above 200 MeV. Hence, there is a clear and long-standing demand from the International Atomic Energy Agency (IAEA) to complement the experimental database from 20 MeV to 1 GeV. For this purpose at the neutron facility n TOF at CERN the measurement of $^{235}$U(n,f) cross section was planned in October 2018, taking advantage of the intense neutron beam with a wide energy spectrum available in the experimental area. The cross section measurement will be performed relative to the elastic neutron-proton scattering, a very well known reaction generally accepted as primary reference. A prototype of the Proton Recoil Telescope detector, that will be used to measure the incident neutron flux, has been built and tested at n_TOF in 2017. |