Fast Neutron Time-of-Flight Spectrometer Used with the Karlsruhe Isochronous Cyclotron

Abstract

A high resolution, fast neutron, time-of-flight spectrometer used for neutron energies between about several hundred kiloelectron volts and 30 .MeV is described. A 1 nsec neutron pulse occurring with a repetition rate of 20 kc is obtained with a novel "bunching deflection" system operating on the internal beam of the fixed energy Karlsruhe isochronous cyclotron. By the timing of the neutrons over a 57 m f1ight path aresolution of 0.025 nsec/ni at optimum was obtained. Detector counts are accumulated in a 2X8000 channel time analyzer system with 1 nsec channel width. A planned f1ight path of 180 m and an increase of the repetition rate from 20 kc at present to 200 kc is expected to provide further improvements of the spectrometer.

Neutron scattering from28Si and32S from 8.0 to 18.9 MeV, dispersive optical model analyses, and ground-state correlations

“…The 32 S(n,n) database, listed in Table II, included 40 data points of total cross section based on Refs. [23,32]. It also used 13 σ(θ) angular distributions from Refs.…”

Neutron transmission measurements at nELBE

“…For neon and xenon only data from quasimonoener- Figure 6. The effective total cross sections for nat He, nat O, nat Ne, nat Xe, nat Pt, and 238 U are shown in comparison with selected experimental results from literature [4,[6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28] taken from the EXFOR data base [29] and data from the JEFF evaluation [30]. The data from this work are shown with energy bin sizes corresponding to a time-of-flight bin size of 0.5 ns.…”

Nonelastic-scattering cross sections of elemental nickel. [1. 3 to 4. 5 MeV]

“…Many of the previous measurements of nickel total cross sections have employed relatively thick samples (e.g. ~3.5 cm and nickel has a very high atomic density (16)). Thcugh the experimental resolutions were good, they were not sufficient to resolve all of the resonance structure in the few-tleV region.…”