Total Cross Section of Neutrons on Deuterium in the keV Region

Abstract

Total neutron cross sections en deuterium in the energy range 1 keV to 1000 keV have been measured, and basically agree with our previously reported results. Total neutron cross sections on deuterium provi de a basic test for nuclear three body theory. The most recent continuous energy Measurement in the MeV region was repcrted by Clement et all. These measurements covered the neutron energy range 0.5 MeV to 30 MeV. The only extensive measurements below 0.5 MeV were recently reported by the present authors. They found a rapid rise in cross section for decreasing 2 neutron energy below 300 keV. The experimental results were well explained by three body theoretical calculations of the quartet n-D scattering. The present communication reports a remeasurement of the total cross section below 1.0 MeV, under somewhat difiereiit experimental conditions, V NOTICE | This report was prepared as an account of workl sponsored by the United States Government Neither I MASTER the United States nor the United States Atomic Energy

The joint evaluated fission and fusion nuclear data library, JEFF-3.3

“…In the framework of the ASTRID project (French sodium fast reactor), a new evaluation for sodium from 0 to 20 MeV [153] was carried out using the CONRAD code [154]. The results are included [141,142], lrl80 [143], rpi72 [144], wis71 [145], orl64 [146], lrl58-60 [147,148], las01 [149], har65 [150] in the JEFF-3.3 library. The file contains both re-evaluated nuclear data and covariances and is divided in two energy regions: the resolved resonance range and the continuum part.…”

Colour transparency: A novel test of QCD in nuclear interactions

“…The n N mass spectrum is peaked N(1440,;') is experimentally invisible on the nN continuum background. Besides, the form factor of electroproduction of the Roper resonance vanishes very rapidly with Q [98], and expansion (152) suggests that the Roper resonance is of little relevance to CT problem. Evidently, stripping of pions off the 3y core contributes to CT signal, since that lowers omin from ulo, ( p N ) down to ale, ( ( 3 q ) N ) (see below, section 16.4).…”

Generating a multi-line neutron beam using an electron Linac and a U-filter

“…In all previous studies [7,8,10,11] involving electron Linacs, iron was used as a filter. The main advantage of using a Linac is the high neutron fluxes produced at higher energies.…”

“…In fact, such a multi-line neutron source with an Fe filter in conjunction with an electron linear accelerator has already been used. A precise determination of the total neutron cross-section of hydrogen [8] and of deuterium [10,11] was made using this method. It was also employed to investigate the minima in the total cross-section of iron, yielding accurate values of the corresponding resonance parameters [7].…”