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New results for Compton scattering on deuterium : A better determination of the neutron electromagnetic polarizabilities

Feldman, G. ; Myers, L. S. ; Annand, J. R M ; Brudvik, J. LU ; Fissum, K. G. LU orcid ; Griesshammer, H. W. ; Hansen, K. LU ; Henshaw, S. S. ; Isaksson, L. LU and Kovash, M. A. , et al. (2015) In Proceedings of Science
Abstract

The electric and magnetic polarizabilities of the proton are now well known, owing to Compton scattering measurements on hydrogen targets; however, the neutron polarizabilities are still relatively uncertain, compared to the proton values. To address this problem, a multiinstitutional collaboration has conducted a program of elastic Compton scattering experiments on deuterium at the MAX IV Laboratory in Lund, Sweden using tagged photons in the energy range Eγ= 65-115 MeV. We assembled at one laboratory, for the first time, three of the world's largest NaI detectors, each having better than ΔE/E ∼ 2% photon energy resolution. We have measured elastic Compton scattering cross sections at lab angles of θγ= 60°, 120°... (More)

The electric and magnetic polarizabilities of the proton are now well known, owing to Compton scattering measurements on hydrogen targets; however, the neutron polarizabilities are still relatively uncertain, compared to the proton values. To address this problem, a multiinstitutional collaboration has conducted a program of elastic Compton scattering experiments on deuterium at the MAX IV Laboratory in Lund, Sweden using tagged photons in the energy range Eγ= 65-115 MeV. We assembled at one laboratory, for the first time, three of the world's largest NaI detectors, each having better than ΔE/E ∼ 2% photon energy resolution. We have measured elastic Compton scattering cross sections at lab angles of θγ= 60°, 120° and 150° over this energy range in 8 MeV steps. This effectively doubles the world's set of elastic Compton scattering data from deuterium and provides valuable input for chiral effective field theory (χEFT) calculations. These new deuterium data overlap previous measurements and extend them by 20 MeV to higher energies. Based on χEFT fits to the expanded world data set, new values for the neutron electric and magnetic polarizabilities have been obtained with greater accuracy than previously achieved, decreasing the statistical error by more than 30%.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Proceedings of Science
article number
074
publisher
Sissa Medialab srl
external identifiers
  • scopus:84988683736
ISSN
1824-8039
project
Elastic and Virtual Compton Scattering and Nucleon Polarizabilities
language
English
LU publication?
yes
id
425153b5-d6b5-4017-944d-9b5a135bd5e1
date added to LUP
2016-12-14 08:35:56
date last changed
2022-01-30 08:32:40
@article{425153b5-d6b5-4017-944d-9b5a135bd5e1,
  abstract     = {{<p>The electric and magnetic polarizabilities of the proton are now well known, owing to Compton scattering measurements on hydrogen targets; however, the neutron polarizabilities are still relatively uncertain, compared to the proton values. To address this problem, a multiinstitutional collaboration has conducted a program of elastic Compton scattering experiments on deuterium at the MAX IV Laboratory in Lund, Sweden using tagged photons in the energy range E<sub>γ</sub>= 65-115 MeV. We assembled at one laboratory, for the first time, three of the world's largest NaI detectors, each having better than ΔE/E ∼ 2% photon energy resolution. We have measured elastic Compton scattering cross sections at lab angles of θ<sub>γ</sub>= 60°, 120° and 150° over this energy range in 8 MeV steps. This effectively doubles the world's set of elastic Compton scattering data from deuterium and provides valuable input for chiral effective field theory (χEFT) calculations. These new deuterium data overlap previous measurements and extend them by 20 MeV to higher energies. Based on χEFT fits to the expanded world data set, new values for the neutron electric and magnetic polarizabilities have been obtained with greater accuracy than previously achieved, decreasing the statistical error by more than 30%.</p>}},
  author       = {{Feldman, G. and Myers, L. S. and Annand, J. R M and Brudvik, J. and Fissum, K. G. and Griesshammer, H. W. and Hansen, K. and Henshaw, S. S. and Isaksson, L. and Kovash, M. A. and Lundin, M. and Mcgovern, J. A. and Nathan, A. M. and Phillips, D. R. and Schröder, B. and Shoniyozov, K. and Stave, S. C.}},
  issn         = {{1824-8039}},
  language     = {{eng}},
  publisher    = {{Sissa Medialab srl}},
  series       = {{Proceedings of Science}},
  title        = {{New results for Compton scattering on deuterium : A better determination of the neutron electromagnetic polarizabilities}},
  year         = {{2015}},
}