Measurement of the $^{4}\mathrm{He}$$(\ensuremath{\gamma},n)$ reaction from $23&lt;{E}_{\ensuremath{\gamma}}&lt;70$ MeV

Measurement of the ${}^{4}{He}$ $(γ, n)$ reaction from $23 < E_{γ} < 70$ MeV

B. Nilsson, J.-O. Adler, B.-E. Andersson, J. R. M. Annand, I. Akkurt, M. J. Boland, G. I. Crawford, K. G. Fissum, K. Hansen, P. D. Harty, D. G. Ireland, L. Isaksson, M. Karlsson, M. Lundin, J. C. McGeorge, G. J. Miller, H. Ruijter, A. Sandell, B. Schröder, D. A. Sims, and D. Watts (The MAX-lab Nuclear Physics Working Group)

Phys. Rev. C 75, 014007 – Published 19 January 2007

Abstract

A comprehensive set of ${}^{4}{He}$ $(γ, n)$ absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from $23 < E_{γ} < 70$ MeV were directed toward a liquid ${}^{4}{He}$ 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.

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Received 31 March 2006

DOI:https://doi.org/10.1103/PhysRevC.75.014007

Authors & Affiliations

B. Nilsson^1,*, J.-O. Adler¹, B.-E. Andersson^1,†, J. R. M. Annand², I. Akkurt^2,‡, M. J. Boland^1,§, G. I. Crawford², K. G. Fissum^1,∥, K. Hansen^1,*, P. D. Harty^2,¶, D. G. Ireland², L. Isaksson^1,*, M. Karlsson¹, M. Lundin^1,*, J. C. McGeorge², G. J. Miller^2,**, H. Ruijter^1,††, A. Sandell^1,‡‡, B. Schröder¹, D. A. Sims^1,§§, and D. Watts^2,∥∥ (The MAX-lab Nuclear Physics Working Group)

¹Department of Physics, Lund University, SE-221 00 Lund, Sweden
²Department of Physics and Astronomy, University of Glasgow, G12 8QQ Glasgow, United Kingdom

^*Present address: MAX-lab, Lund University, SE-221 00 Lund, Sweden.
^†Present address: Furulundsskolan, SE-294 80 Sölvesborg, Sweden.
^‡Present address: Department of Physics, Süleyman Demirel University, Fen-Edebiyat Faculty, 32 260 Isparta, Turkey.
^§Present address: Australian Synchrotron, Clayton, Victoria 3168, Australia.
^∥Corresponding author. Electronic address: kevin.fissum@nuclear.lu.se
^¶Electronic address: Peter.Harty@dhs.vic.gov.au
^**Present address: NEL Oil and Gas Services, TUV NEL Ltd., G75 0QU East Kilbride, United Kingdom.
^††Present address: Sony Ericsson Mobile Communications AB, SE-221 88 Lund, Sweden.
^‡‡Present address: Lund University Hospital, SE-221 85 Lund, Sweden.
^§§Electronic address: David.Sims@tenix.com
^∥∥Present address: School of Physics, University of Edinburgh, EH9 3JZ Edinburgh, United Kingdom.

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Vol. 75, Iss. 1 — January 2007

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Physical Review C

covering nuclear physics

Measurement of the ${}^{4}{He}$ $(γ, n)$ reaction from $23 < E_{γ} < 70$ MeV

Phys. Rev. C 75, 014007 – Published 19 January 2007

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Measurement of the He4(γ,n) reaction from 23<Eγ<70 MeV

Phys. Rev. C 75, 014007 – Published 19 January 2007

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Measurement of the ${}^{4}{He}$ $(γ, n)$ reaction from $23 < E_{γ} < 70$ MeV