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Title: Development of spectrometer for the measurement of (n,xp), (n,xd), and (n,x. cap alpha. ) cross sections, angular distributions and spectra at E/sub n/ = 15 MeV. [Cross sections significant below 2. 5 MeV]

Abstract

A spectrometer to measure neutron-induced charged-particle producing reactions was developed and yields data with greatly improved signal-to-background ratios. It consists of a magnetic quadrupole lens which focusses the charged particles onto a silicon surface barrier detector or a two-detector telescope which is more than 2 meters from the sample being irradiated. The efficiency of the spectrometer is calibrated experimentally and depends only on values for the (n,p) elastic cross section and the stopping power of polyethylene. Further development is underway to replace the surface-barrier ..delta..E counter with a proportional counter of larger area. This detector, combined with a larger E counter (surface barrier) could increase the effective solid angle by a factor of five. The results for (n,xp), (n,xd) and (n,x..cap alpha..) cross sections are summarized for the eight target materials studied so far. Measurements of the charged particle spectra have established that cross sections for production of protons below 2.5 MeV are significant for some targets; in fact protons as low as 800 keV have been detected from aluminum. These low energy protons would be quite difficult to measure with conventional counter telescope spectrometers.

Authors:
; ; ; ;
Publication Date:
Research Org.:
California Univ., Livermore (USA). Lawrence Livermore Lab.
OSTI Identifier:
7211025
Report Number(s):
UCRL-79454; CONF-770523-3
TRN: 77-014013
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Symposium on neutron cross sections 10-40 MeV, Upton, NY, USA, 3 May 1977
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALUMINIUM 27 TARGET; NEUTRON REACTIONS; COPPER 63 TARGET; COPPER 65 TARGET; MAGNETIC LENS SPECTROMETERS; DESIGN; NIOBIUM 93 TARGET; TITANIUM 46 TARGET; TITANIUM 48 TARGET; VANADIUM 51 TARGET; CALIBRATION; EFFICIENCY; IRON; PERFORMANCE; SI SEMICONDUCTOR DETECTORS; SURFACE BARRIER DETECTORS; BARYON REACTIONS; ELEMENTS; HADRON REACTIONS; MAGNETIC SPECTROMETERS; MEASURING INSTRUMENTS; METALS; NUCLEAR REACTIONS; NUCLEON REACTIONS; RADIATION DETECTORS; SEMICONDUCTOR DETECTORS; SPECTROMETERS; TARGETS; TRANSITION ELEMENTS; 440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation; 651425 - Nuclear Properties & Reactions, A=20-38, Experimental- Nuclear Reactions & Scattering- (-1987); 651525 - Nuclear Properties & Reactions, A=39-58, Experimental- Nuclear Reactions & Scattering- (-1987); 651625 - Nuclear Properties & Reactions, A=59-89, Experimental- Nuclear Reactions & Scattering- (-1987); 651725 - Nuclear Properties & Reactions, A=90-149, Experimental- Nuclear Reactions & Scattering- (-1987); 651100 - Nuclear Physics- Experimental Techniques- (1980-)

Citation Formats

Grimes, S M, Haight, R C, Anderson, J D, Alvar, K R, and Borchers, R R. Development of spectrometer for the measurement of (n,xp), (n,xd), and (n,x. cap alpha. ) cross sections, angular distributions and spectra at E/sub n/ = 15 MeV. [Cross sections significant below 2. 5 MeV]. United States: N. p., 1977. Web.
Grimes, S M, Haight, R C, Anderson, J D, Alvar, K R, & Borchers, R R. Development of spectrometer for the measurement of (n,xp), (n,xd), and (n,x. cap alpha. ) cross sections, angular distributions and spectra at E/sub n/ = 15 MeV. [Cross sections significant below 2. 5 MeV]. United States.
Grimes, S M, Haight, R C, Anderson, J D, Alvar, K R, and Borchers, R R. 1977. "Development of spectrometer for the measurement of (n,xp), (n,xd), and (n,x. cap alpha. ) cross sections, angular distributions and spectra at E/sub n/ = 15 MeV. [Cross sections significant below 2. 5 MeV]". United States. https://www.osti.gov/servlets/purl/7211025.
@article{osti_7211025,
title = {Development of spectrometer for the measurement of (n,xp), (n,xd), and (n,x. cap alpha. ) cross sections, angular distributions and spectra at E/sub n/ = 15 MeV. [Cross sections significant below 2. 5 MeV]},
author = {Grimes, S M and Haight, R C and Anderson, J D and Alvar, K R and Borchers, R R},
abstractNote = {A spectrometer to measure neutron-induced charged-particle producing reactions was developed and yields data with greatly improved signal-to-background ratios. It consists of a magnetic quadrupole lens which focusses the charged particles onto a silicon surface barrier detector or a two-detector telescope which is more than 2 meters from the sample being irradiated. The efficiency of the spectrometer is calibrated experimentally and depends only on values for the (n,p) elastic cross section and the stopping power of polyethylene. Further development is underway to replace the surface-barrier ..delta..E counter with a proportional counter of larger area. This detector, combined with a larger E counter (surface barrier) could increase the effective solid angle by a factor of five. The results for (n,xp), (n,xd) and (n,x..cap alpha..) cross sections are summarized for the eight target materials studied so far. Measurements of the charged particle spectra have established that cross sections for production of protons below 2.5 MeV are significant for some targets; in fact protons as low as 800 keV have been detected from aluminum. These low energy protons would be quite difficult to measure with conventional counter telescope spectrometers.},
doi = {},
url = {https://www.osti.gov/biblio/7211025}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1977},
month = {Sat Jan 01 00:00:00 EST 1977}
}

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