Abstract
The accelerator driven fast neutron sources of the white- and quasi-monoenergetic spectra are operated at the NPI Rez Fast Neutron Facility utilizing the Be(thick), D2 O(thick), and 7 Li(C) target stations and the variable energy proton beam (up to 37 MeV) from the U-120M isochronous cyclotron. Recently, the design of beryllium target station was upgraded in order to provide the higher neutron flux at the modified positions of irradiated samples. Afterwards, the thick target neutron field of the p+Be source reaction was investigated for proton energy of 35 MeV. The spectral neutron flux for several target-to-sample distances was determined using the multi-foil activation technique. From measured reaction rates, new neutron spectra were reconstructed employing the SAND-II unfolding code and validated against the MCNPX predictions. The IFMIF-like (International Fusion Material Irradiation Facility) neutron field obtained from the p(35)+Be source is suitable for the neutron cross-sections validation within the IFMIF research program, radiation hardness tests of electronics, and neutron activation analysis experiments.
Highlights
The accelerator-driven fast neutron generators with broad neutron spectrum are mostly built on the thick beryllium targets
During the proton bombardment of beryllium target, the high energy neutron spectrum component is produced by the 9Be(p,n)9B reaction; the low energy spectrum fraction is formed in the multi-body break-up processes
At the NPI, new neutron field based on the p(35)+Be reaction of upgraded Be-target station have been developed
Summary
1. Introduction of 0 ◦Can be estimated from the empirical equation [3, 10]: The accelerator-driven neutron sources represent the appropriate devices for neutron field production of precisely given parameters that are useful for clinical neutron radiotherapy, measurement and validation of nuclear data for advanced nuclear energetic applications, and for material hardness study. The Nuclear Physics Institute of the CAS belongs to laboratories that operate such types of cyclotron based fast neutron generators.
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