I. Slypen

Geometry and Energy-loss Features of Charged-particle Production in Fast-neutron Induced Reactions

Raw data reduction of charged particle production in fast neutron induced reactions must take into account specific characteristics of this type of experiment. A calculation procedure is presented which considers particular features such as: the thickness of targets, beam dimensions on the target, the beam profile, relative target-telescope angular position etc. It results in a simulation programme (Perten) of the experiment. The way the above mentioned particularities are considered, is exemplified in calculating solid angles and fractions of target producing charged particles with enough energy to be registered by the detector.

Neutron-proton differential cross section measurements for E(n) from 28 to 75 MeV

Experimental measurements of differential cross-sections for neutron-proton scattering are reported for 12 incident neutron energies between 28 and 75 MeV. Data are compared with predictions of different theoretical models and with other experimental results.

Charged-particles Produced in Fast-neutron Induced Reactions On C-12 in the 45-80 Mev Energy-range

The experimental set-up used to measure angular distributions (from 20 degrees to 160 degrees in steps of 10 degrees) and energy spectra for C-12(n, px), C-12(n, dx), C-12(n, tx) and C-12(n, alpha x) reactions is described in detail. The reaction products are detected by Delta E-E telescopes while charged particle discrimination is realised by charge integration on the E signal. Time-of-flight spectra are also registered for charged particle events. Measurements have been performed for three different incident neutron energies: 42.5, 62.7 and 72.8 MeV. Raw spectra of C-12(n, px) and C-12(n, dx) reactions at 62.7 and 72.8 MeV are presented.

HINDAS A European Nuclear Data Program for Accelerator-Driven Systems

In the HINDAS program, nuclear data in the 20-2000 MeV range are evaluated by means of a combination of nuclear tmodels and well-selected intermediate- and high-energy experiments. A panoply of European accelerators is utilized to provide complete sets of experimental data for iron, lead and uranium over a large energy range. Nuclear model codes are being improved and validated against these new experimental data. This should result in enhanced ENDF-formatted data libraries up to 200 MeV, and cross sections for high-energy transport codes above 200 MeV. The impact of the new data libraries and high-energy models will be directly tested on some important parameters of an accelerator-driven system (ADS). Here, we report the recent progress of the various experimental and theoretical activities in HINDAS.

Kerma values deduced from neutron-induced charged-particle spectra of carbon from 40 to 75 MeV.

The double-differential cross-sections for the 12C(n, px), 12C(n, dx), 12C(n, tx) and 12C(n, alpha x) reactions have been measured at three incident neutron energies, 42.5, 62.7 and 72.8 MeV, at laboratory angles between 20 degrees and 160 degrees. From these measurements, the energy-differential cross-sections have been determined and consequently the partial and total kerma values. Results of the experimental double-differential and energy-differential cross-sections at the three incident neutron energies are presented. The deduced kerma values are compared with previous measurements and theoretical predictions.

Secondary light charged particle emission from the interaction of 25- to 65-MeV neutrons on silicon

Abstract Double-differential cross sections for the production of protons, deuterons, tritons, and alpha particles from a silicon target were determined using fast incident neutrons. The inclusive charged particle emission spectra were measured at six laboratory angles, 20, 40, 60, 70, 110, and 140 deg, over the neutron energy range of 25 to 65 MeV. Representative results are shown for the cross-section differentials in energy and angle as well as for angle-integrated cross sections. The spectra are compared to existing data and with predictions from nuclear model calculations. Since the data for 62.7-MeV incident neutrons are the most complete, we emphasized these results; from the experimental energy-differential cross sections, the total charged particle production cross sections are determined as well as the partial and total kerma coefficients for silicon. Moreover, a comparison is done with our data on aluminum, for which exists a consistent set of measured cross sections in the same neutron energy region.

Experimental double-differential cross sections and derived kerma factors for oxygen at incident neutron energies from reaction thresholds to 65 MeV.

The double-differential cross sections (energy spectra) for the (n, px), (n, dx), (n, tx) and (n, rx) reactions on oxygen have been measured for nine incident neutron energies in the range 25 to 65 MeV at lab angles between 20 degrees and 160 degrees in steps of 10 degrees. From these measurements, the energy differential cross sections have been determined and consequently the partial and total kerma factors. Based on the obtained experimental partial kerma factors in the incident neutron energy range 25-65 MeV, a procedure is proposed for the extrapolation of these values to the reaction threshold energy of each measured reaction channel. Results of the experimental double-differential, energy differential and total cross sections are presented. The deduced partial and total kerma factors of the present work are compared with results of previous measurements and theoretical predictions.

Light charged particle emission induced by fast neutrons with energies between 25 and 65 MeV on iron

Double-differential cross sections (energy spectra) for proton, deuteron, triton and alpha-particle emission in fast neutron-induced reactions on iron are reported for ten incident neutron energies between 25 and 65 Mev Energy spectra were obtained at nine laboratory angles between 20degrees and 160degrees and extrapolated or interpolated to ten other angles extending the angular distribution from 2.5degrees to 177.5degrees. The experimental set-up and the procedure for data taking and data reduction are briefly presented. Deduced energy-differential and total cross sections are also reported. Experimental cross sections are compared with data from proton-induced reactions on Fe-54 and Fe-56, and with our data from neutron-induced reactions on cobalt. Theoretical calculations of GNASH and TALYS reaction codes are also compared to the experimental data.

Light charged particle emission induced by fast neutrons (25 to 65 MeV) on Co-59

Double-differential cross sections (energy spectra) for the proton, deuteron, triton and alpha-particle production in fast neutron induced reactions on cobalt are reported for ten incident neutron energies between 25 and 65 MeV. Energy spectra were obtained at nine laboratory angles between 20degrees and 160degrees and extrapolated or interpolated to other ten angles covering uniformly the laboratory angular domain of 0degrees to 180degrees. The experimental set-up and procedures for data reduction including corrections and normalization are presented and discussed. Based on the measured double-differential cross sections, energy-differential and total cross sections are reported as well. Experimental cross sections are compared with similar available data from neutron- and proton-induced reactions. Theoretical calculations based on semiclassical exciton model and Hauser-Feshbach statistical theory (GNASH code) and intranuclear cascade model for nucleon-induced interactions (INCL3 code) were done and compared to the experimental results.

Light charged particle production in fast neutron-induced reactions on carbon (E-n=40 to 75 MeV) (II). Tritons and alpha particles

Double-differential cross sections for fast neutron-induced triton and alpha-particle production on carbon are reported at six incident neutron energies between 40 and 75 MeV. Angular distributions were measured at laboratory angles between 20 degrees and 160 degrees. Energy-differential, angle-differential and total cross sections are also reported. Experimental cross sections are compared to existing experimental data and to theoretical model calculations