An update on (n,charged particle) research at WNR

Abstract

Neutron-induced reactions producing light charged particles continue to be investigated at the spallation fast-neutron source at the Los Alamos Neutron Science Center (LANSCE). New dah on the cross seclions for alpha-parlicle produclion for neukons on 5*Ni and a N i are presented from threshold to 50 MeV. Recent changes in the experiment now allow protons, deuterons, tritons, 3He and alpha particles to be identified.

Measurement and model analysis of(n,xα)cross sections for Cr, Fe,59Co, andKunieda1, Haight2, Kawano3 et al. 2012Phys. Rev. CSelf Cite25030View full textAdd to dashboardCite

“…Both the experimental and theoretical excitation functions for these nuclei exhibit a rather flat shape above ∼ 50 MeV, and we expect similar shapes in the alpha- 60 Ni compared with the experimental data of Haight et al [12]. The total production cross sections are the sum of those from the multiple pre-equilibrium and the statistical decay processes.…”

“…These data cover the energy range from the threshold to 50 MeV for 59 Co and 58,60 Ni, and to 100 MeV for elemental Cr and Fe, where the pickup mechanism is dominant. The data for 59 Co have been published with experimental details previously [10] and a preliminary was made for the nickel isotopes [11,12]. The cross sections for Cr and Fe were newly measured by following the same experimental technique (though preliminary data have reported elsewhere [13]).…”

Cross-section measurements for the 58,60,61Ni(n, α)55,57,58Fe reactions at 8.50, 9.50 and 10.50 MeV neutron energies *

“…As Fig. 6 (a) -(c) show, the present reaction cross sections were compared with the data from different eval-uations [17,18,[25][26][27][28][29][30], as well as existing measurement data of the 58,60,61 Ni(n, α) 55,57,58 Fe reactions and the 58,60,61 Ni(n, xα) reactions below 11 MeV [5][6][7][8][9][10][11][12][13][14][15][16][19][20][21][22][23][24].…”

“…So, the cross sections of the (n, xα) reactions can be used as the reference for the analysis of the excitation functions of the (n, α) reactions below 11 MeV. In the 8.50-10.50 MeV energy region, there are six measurement data [19][20][21][22][23][24] for the 58 Ni(n, xα) reaction, four measurement data [21][22][23][24] for the 60 Ni(n, xα) reaction, and one measurement datum [22] for the 61 Ni(n, xα) reaction. Among these data, discrepancies are apparent.…”

Tritium Production by Fast Neutrons on Oxygen: An Integral Experiment

“…Collimation of the neutron beam was the same as used in other experiments 8 and shaped the beam to a square 5 cm x 5 cm with 1 cm triangles cut off the corners. A clean-up collimator was placed just in front of the water samples to intercept neutrons scattered from the defining collimator.…”