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Title: Measurement of the {sup 4}He({gamma},n) reaction from 23<E{sub {gamma}}<70 MeV

Abstract

A comprehensive set of {sup 4}He({gamma},n) absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from 23<E{sub {gamma}}<70 MeV were directed toward a liquid {sup 4}He target, and neutrons were identified using pulse-shape discrimination and the time-of-flight technique in two liquid-scintillator detector arrays. Seven-point angular distributions have been measured for 14 photon energies. The results have been subjected to complementary transition-coefficient and Legendre-coefficient analyses. The results are also compared to experimental data measured at comparable photon energies as well as recoil-corrected continuum shell-model, resonating group method, and effective interaction hyperspherical-harmonic expansion calculations. For photon energies below 29 MeV, the angle-integrated data are significantly larger than the values recommended by Calarco, Berman, and Donnelly in 1983.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ; ; ; ;  [2]
  1. Department of Physics, Lund University, SE-221 00 Lund (Sweden)
  2. Department of Physics and Astronomy, University of Glasgow, G12 8QQ Glasgow (United Kingdom) (and others)
Publication Date:
OSTI Identifier:
20990938
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.014007; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR DISTRIBUTION; CROSS SECTIONS; HELIUM 4; LIQUID SCINTILLATORS; LIQUIDS; MEV RANGE 10-100; NEUTRONS; PHOTONS; PULSE SHAPERS; RESONATING-GROUP METHOD; SHELL MODELS; TIME-OF-FLIGHT METHOD

Citation Formats

Nilsson, B., Adler, J.-O., Andersson, B.-E., Boland, M. J., Fissum, K. G., Hansen, K., Isaksson, L., Karlsson, M., Lundin, M., Ruijter, H., Sandell, A., Schroeder, B., Sims, D. A., Annand, J. R. M., Akkurt, I., Crawford, G. I., Harty, P. D., Ireland, D. G., McGeorge, J. C., and Miller, G. J. Measurement of the {sup 4}He({gamma},n) reaction from 23<E{sub {gamma}}<70 MeV. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.014007.
Nilsson, B., Adler, J.-O., Andersson, B.-E., Boland, M. J., Fissum, K. G., Hansen, K., Isaksson, L., Karlsson, M., Lundin, M., Ruijter, H., Sandell, A., Schroeder, B., Sims, D. A., Annand, J. R. M., Akkurt, I., Crawford, G. I., Harty, P. D., Ireland, D. G., McGeorge, J. C., & Miller, G. J. Measurement of the {sup 4}He({gamma},n) reaction from 23<E{sub {gamma}}<70 MeV. United States. doi:10.1103/PHYSREVC.75.014007.
Nilsson, B., Adler, J.-O., Andersson, B.-E., Boland, M. J., Fissum, K. G., Hansen, K., Isaksson, L., Karlsson, M., Lundin, M., Ruijter, H., Sandell, A., Schroeder, B., Sims, D. A., Annand, J. R. M., Akkurt, I., Crawford, G. I., Harty, P. D., Ireland, D. G., McGeorge, J. C., and Miller, G. J. Mon . "Measurement of the {sup 4}He({gamma},n) reaction from 23<E{sub {gamma}}<70 MeV". United States. doi:10.1103/PHYSREVC.75.014007.
@article{osti_20990938,
title = {Measurement of the {sup 4}He({gamma},n) reaction from 23<E{sub {gamma}}<70 MeV},
author = {Nilsson, B. and Adler, J.-O. and Andersson, B.-E. and Boland, M. J. and Fissum, K. G. and Hansen, K. and Isaksson, L. and Karlsson, M. and Lundin, M. and Ruijter, H. and Sandell, A. and Schroeder, B. and Sims, D. A. and Annand, J. R. M. and Akkurt, I. and Crawford, G. I. and Harty, P. D. and Ireland, D. G. and McGeorge, J. C. and Miller, G. J.},
abstractNote = {A comprehensive set of {sup 4}He({gamma},n) absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from 23<E{sub {gamma}}<70 MeV were directed toward a liquid {sup 4}He target, and neutrons were identified using pulse-shape discrimination and the time-of-flight technique in two liquid-scintillator detector arrays. Seven-point angular distributions have been measured for 14 photon energies. The results have been subjected to complementary transition-coefficient and Legendre-coefficient analyses. The results are also compared to experimental data measured at comparable photon energies as well as recoil-corrected continuum shell-model, resonating group method, and effective interaction hyperspherical-harmonic expansion calculations. For photon energies below 29 MeV, the angle-integrated data are significantly larger than the values recommended by Calarco, Berman, and Donnelly in 1983.},
doi = {10.1103/PHYSREVC.75.014007},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}