First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons

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dc.creator Dieterle, M.
dc.creator Witthauer, L.
dc.creator Cividini, F.
dc.creator Abt, S.
dc.creator Achenbach, P.
dc.creator Adlarson, P.
dc.creator Afzal, F.
dc.creator Ahmed, Z.
dc.creator Akondi, C. S.
dc.creator Annand, J. R. M.
dc.creator Arends, H. J.
dc.creator Bashkanov, M.
dc.creator Beck, R.
dc.creator Biroth, M.
dc.creator Borisov, N. S.
dc.creator Braghieri, A.
dc.creator Briscoe, W. J.
dc.creator Costanza, S.
dc.creator Collicott, C.
dc.creator Denig, A.
dc.creator Downie, E. J.
dc.creator Drexler, P.
dc.creator Ferretti-Bondy, M.I.
dc.creator Gardner, S.
dc.creator Garni, S.
dc.creator Glazier, D. I.
dc.creator Glowa, D.
dc.creator Gradl, W.
dc.creator Günther, M.
dc.creator Gurevich, G. M.
dc.creator Hamilton, D.
dc.creator Sarty, A.
dc.date.accessioned 2021-08-12T16:45:33Z
dc.date.available 2021-08-12T16:45:33Z
dc.date.issued 2017-07-10
dc.identifier.issn 0370-2693
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/29781
dc.description Published Version en_CA
dc.description.abstract The double-polarization observable E and the helicity-dependent cross sections &sigma;<sub>1/2</sub>and &sigma;<sub>3/2</sub>have been measured for the first time for single &pi;<sup>0</sup>photoproduction from protons and neutrons bound in the deuteron at the electron accelerator facility MAMI in Mainz, Germany. The experiment used a circularly polarized photon beam and a longitudinally polarized deuterated butanol target. The reaction products, recoil nucleons and decay photons from the &pi;0meson were detected with the Crystal Ball and TAPS electromagnetic calorimeters. Effects from nuclear Fermi motion were removed by a kinematic reconstruction of the &pi;<sup>0</sup>N final state. A comparison to data measured with a free proton target showed that the absolute scale of the cross sections is significantly modified by nuclear final-state interaction (FSI) effects. However, there is no significant effect on the asymmetry E since the &sigma;<sub>1/2</sub>and &sigma;<sub>3/2</sub>components appear to be influenced in a similar way. Thus, the best approximation of the two helicity-dependent cross sections for the free neutron is obtained by combining the asymmetry E measured with quasi-free neutrons and the unpolarized cross section corrected for FSI effects under the assumption that the FSI effects are similar for neutrons and protons. en_CA
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dc.description.provenance Made available in DSpace on 2021-08-12T16:45:33Z (GMT). No. of bitstreams: 1 Sarty_A_article_2017_b.pdf: 1594745 bytes, checksum: f209d39b9f971564bf0017afd56d0e16 (MD5) Previous issue date: 2017-07-10 en
dc.language.iso en en_CA
dc.publisher Elsevier en_CA
dc.rights © 2017 The Authors<p xmlns:cc="http://creativecommons.org/ns#" >This work is licensed under <a href="http://creativecommons.org/licenses/by/4.0/?ref=chooser-v1" target="_blank" rel="license noopener noreferrer" style="display:inline-block;">CC BY 4.0<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/cc.svg?ref=chooser-v1"><img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;" src="https://mirrors.creativecommons.org/presskit/icons/by.svg?ref=chooser-v1"></a></p>
dc.subject.lcsh Polarization (Nuclear physics)
dc.subject.lcsh Particles (Nuclear physics) -- Helicity
dc.subject.lcsh Cross sections (Nuclear physics)
dc.title First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons en_CA
dc.title.alternative First measurement of the polarization observable E and helicity-dependent cross sections in single π[superscript 0] photoproduction from quasi-free nucleons
dc.title.alternative First measurement of the polarization observable E and helicity-dependent cross sections in single pi[superscript 0] photoproduction from quasi-free nucleons
dc.type Text en_CA
dcterms.bibliographicCitation Physics Letters B 770, 523–531. (2017) en_CA
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