Fast neutron forward distributions from C, Be, and U thick targets bombarded by deuterons

Abstract

Measured angular and energetic distributions of neutrons obtained by bombarding Be, C, and U thick targets with 2 H at 17, 20, and 28 MeV incident energies are reported. The data were obtained using the time-of-flight method. The energetic distributions of neutrons were determined at 0 ± , 5 ± , 10 ± , and 20 ± . The data are compared with a modelization based on stripping formalism extended for thick targets.[S1098-4402(99)00029-4] PACS numbers: 29.25.Dz, 25.85.Ec

Neutron yield from carbon, light- and heavy-water thick targets irradiated by 40MeV deuterons

“…in which the beam is stopped, with light charged particles. Thus, in the frame of the French project SPIRAL2 [1], systematical measurements of neutron yield with various targets bombarded with deuterons of various energies have been undertaken [2,3,1], following more ancient measurements at 33 MeV [5,6]. In addition, for the Italian project SPES [7], measurements of neutron yield by protons on a carbon target enriched in 13 C have been carried out by some of us [8,9] using the time-of-flight and activation methods.…”

Towards High-Repetition-Rate Fast Neutron Sources Using Novel Enabling Technologies

“…In the 10-20 MeV energy range, the 9 Be(d,n+α) reaction becomes dominant over deuteron stripping or breakup. (8, 12, and 15 MeV from [86], 40 MeV from [87]) and for beryllium (squares) from [88] measured with a monoenergetic deuteron beam produced by an accelerator impinging on a thick converter target as well as simulation studies (empty circles) using Monte Carlo codes [89,90]. The plotted lines are a guide to the eye for the two different materials.…”

“…Figure 4. (a) Simulated neutron production cross sections (solid lines)[79][80][81] and corresponding experimental values (crosses) for lithium[82][83][84], (b) simulated neutron production cross sections for beryllium[79][80][81]85] and (c) experimental neutron yields (full circles) for lithium(8, 12, and 15 MeV from[86], 40 MeV from[87]) and for beryllium (squares) from[88] measured with a monoenergetic deuteron beam produced by an accelerator impinging on a thick converter target as well as simulation studies (empty circles) using Monte Carlo codes[89,90]. The plotted lines are a guide to the eye for the two different materials.…”

Unconventional Electronic Properties of Mg2Si Thermoelectrics Revealed by Fast-Neutron-Irradiation Doping

“…The main outcome of a fast-neutron bombardment of a substance consists in the appearance of strong displacements of atoms from their equilibrium positions, toward relatively stable interstitial sites. − This type of irradiation does not change a charge balance inside crystal lattice, in contrary to other common treatments, like electron irradiation. ,, Another potential implication of a fast-neutron bombardment, such as transmutations in a lattice because of thermal capture of neutrons by nuclei, was reported to give negligible contributions for the overwhelming majority of materials. − , Irradiation with fast neutrons typically creates a limited number of stable radiation defects; some of those may be electrically active, and hence capable to contribute to electronic transport, either as charge carriers or as scattering factors for the original charge carriers in pristine material. In pure semiconducting materials, a contribution of radiation defects may be significant, ,,− whereas in metals or semimetals with high carrier concentrations, this contribution may be minor or very moderate. , Some materials subjected to a fast-neutron irradiation also demonstrated signatures of moderate structural disordering …”