S. I. Al-Quraishi

Measurement of the thick-target 9Be(p, n) neutron energy spectra

Abstract The thick-target neutron energy spectra of the 9Be(p,n) reaction were measured at several angles for proton-bombarding energies of 3.0, 3.4, 3.7, 4.0, and 5.0 MeV. Time-of-flight techniques were used to determine the neutron energy spectra and to discriminate against background radiation. By using lithium-loaded glass scintillators and low proton pulse rate frequency, the neutron spectra have been determined at energies as low as 70 keV. The detectors were calibrated for efficiency using the neutron spectrum of the Al(d,n) reaction, which was accurately measured using fission chamber detectors.

A Measurement of the 27Al (d, n) Spectrum for Use in Neutron Detector Calibration

Calibration of neutron detectors for use in measurements spanning a wide range of neutron energies is normally a challenging task. Use of monoenergetic neutron beams is tedious and not convenient for certain energies. Measurements of a continuous spectrum of neutrons from the {sup 27}Al(d,n) reaction at E{sub d} = 7.44 MeV have been made with a fission chamber. This should allow rapid calibration of neutron detectors in the energy range 0.2 {le} E{sub n} {le} 14.5 MeV.

Measurement of the H(n,n)H Elastic Scattering Angular Distribution at En = 15 MeV

We have undertaken an experiment to measure the relative differential cross section for neutron scattering from hydrogen at a neutron energy of 15 MeV, for center‐of‐mass scattering angles from 60 degrees to 180 degrees. A total of eleven E‐ΔE telescopes were used to detect the scattered protons at laboratory angles of 0, ±12, ±24, ±36, ±48, and ±60 degrees. This experiment is intended to extend the earlier work performed by this group at 10.04 MeV. To avoid possible dead‐time problems and amplifier summing noise a unique approach to data acquisition was taken The data acquisition is based on eleven individual data‐acquisition boards, one for each detector telescope, installed in separate personal computers, each running independently. In this way, no multiplexing of the detector signals is required, and the noise associated with the summing of the signals is eliminated. Also an additional acquisition board and personal computer are used for a neutron detector, with gamma‐ray discrimination, as a neutron ...

Study of the Be(p,n) and Be(d,n) Source Reactions

We have developed lithium glass detector arrays to measure the energy spectra of neutrons below 1 MeV. The use of a calibrated neutron source spectrum allows measurement of neutron spectra from 0.070 to 14 MeV. The angular distribution and the neutron energy spectra are reported for the Be(d,n) and Be(p,n) neutron source reactions .The applications of these reactions to Boron Neutron Capture Therapy (BNCT) and neutron radiography are discussed.

Neutrons produced by proton and deuteron bombardment of beryllium

Abstract The method for characterizing neutrons produced by bombardment of beryllium with deuterons at energies from 3.0 to 7.0 MeV is discussed. Similar work for the characterization of the neutrons produced by the bombardment with protons from 2.0 to 4.0 MeV is presented. Both NE213 and lithium glass detectors were used in the time of flight measurement of the neutron spectra. The neutron spectrum from 27Al(d,n) was measured at 7.440 MeV deuteron energy and an angle of 120° with a 235U fission chamber.