Fast-Neutron Scattering from the 182, 184, and 186 Isotopes of Tungsten

Abstract

The differential cross sections for the elastic and the inelastic scattering of fast neutrons from W 182 , W 184 , and W 186 were experimentally determined at incident neutron energy intervals of <25 keV from 0.3 to 1.5 MeV. The excitation, by inelastic scattering, of states in W 182 was observed at 102±5 and 327dblO keV; in W 184 at 110±5, 360±10, 901±10, 1003±10 and 1120±10 keV; and in W 186 at 121±5, 398±10, 738±10, 863±10, 942±10 and 1035=L10 keV. The differential elastic-and inelastic-scattering cross sections were measured at 8 or more angles between 27 and 150 deg by means of a multiangle fast time-of-flight system. The resolution was sufficient to resolve most of the scattered neutron groups. The experimental results were interpreted in terms of a deformed optical model, coupled-channel direct interaction, and Hauser-Feshbach theory. Good agreement with measurement was obtained when the effects of resonance-width fluctuations and correlations were included.

Measurement of (n,xnγ) reaction cross sections in W isotopes

“…Because of this, only an upper limit to the level population cross section can be extracted. The obtained value is in good agreement with previous data [9,10] and TALYS calculations, but no further conclusions can be drawn.…”

“…Indeed, W isotopes are deformed like actinides [8], but easier to describe as they do not present a neutron-induced fission channel. Still, there are only a few measurements available today to test evaluations [9,10]. The experimental data presented here will provide a constraining test of model capabilities for inelastic neutron scattering reactions.…”

Compact lightweight imager of both gamma rays and neutrons based on a pixelated stilbene scintillator coupled to a silicon photomultiplier array

“…15 a, we developed a 21 × 21 rank, centered-mosaic, MURA mask composed of a 2 cm thick tungsten 12 . The tungsten-based mask was also chosen not only to block gamma-rays but also to scatter fast neutrons 26 . The mask selected an anti-symmetric quadratic residue array of size 21 × 21 (2p-1) with the prime number (p) of 11 to match the 11 × 11 pixel section of the SiPM.…”

Hand-held Dual-particle Imager Implemented with a Multiplexed Low Sampling-rate Readout of a SiPM-based Pixelated Stilbene Array

“…14a, we developed a 21 × 21 rank, centered-mosaic, MURA mask composed of a 2 cm thick tungsten [11]. The tungsten-based mask was also chosen not only to block gamma-rays but also to scatter fast neutrons [25]. The mask selected an anti-symmetric quadratic residue array of size 21 × 21 (2p-1) with the prime number (p) of 11 to match the 11 × 11 pixel section of the SiPM.…”