Measurement of the doubly-polarized He 3 → ( γ → , n ) p p reaction at 16.5 MeV and its implications for the GDH sum rule
We report new measurements of the double-polarized photodisintegration of 3He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and...
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| Veröffentlicht in: | Physics letters. B 2015-11, Vol.750 (C), p.547-551 |
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| creator | Laskaris, G. Yan, X. Mueller, J.M. Zimmerman, W.R. Xiong, W. Ahmed, M.W. Averett, T. Chu, P.-H. Deltuva, A. Flower, C. Fonseca, A.C. Gao, H. Golak, J. Heideman, J.N. Karwowski, H.J. Meziane, M. Sauer, P.U. Skibiński, R. Strakovsky, I.I. Weller, H.R. Witała, H. Wu, Y.K. |
| description | We report new measurements of the double-polarized photodisintegration of 3He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three-body channel to the Gerasimov–Drell–Hearn (GDH) integrand were extracted and compared with the state-of-the-art three-body calculations. The calculations, which include the Coulomb interaction and are in good agreement with the results of previous measurements at 12.8 and 14.7 MeV, deviate from the new cross section results at 16.5 MeV. The GDH integrand was found to be about one standard deviation larger than the maximum value predicted by the theories. |
| doi_str_mv | 10.1016/j.physletb.2015.09.065 |
| format | Article |
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The spin-dependent double-differential cross sections and the contribution from the three-body channel to the Gerasimov–Drell–Hearn (GDH) integrand were extracted and compared with the state-of-the-art three-body calculations. The calculations, which include the Coulomb interaction and are in good agreement with the results of previous measurements at 12.8 and 14.7 MeV, deviate from the new cross section results at 16.5 MeV. The GDH integrand was found to be about one standard deviation larger than the maximum value predicted by the theories.</description><identifier>ISSN: 0370-2693</identifier><identifier>EISSN: 1873-2445</identifier><identifier>DOI: 10.1016/j.physletb.2015.09.065</identifier><language>eng</language><publisher>Netherlands: Elsevier</publisher><subject>GDH sum rule ; photoabsorption ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; polarization observables ; polarized 3He</subject><ispartof>Physics letters. 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| ispartof | Physics letters. B, 2015-11, Vol.750 (C), p.547-551 |
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| source | DOAJ Directory of Open Access Journals; Elsevier ScienceDirect Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | GDH sum rule photoabsorption PHYSICS OF ELEMENTARY PARTICLES AND FIELDS polarization observables polarized 3He |
| title | Measurement of the doubly-polarized He 3 → ( γ → , n ) p p reaction at 16.5 MeV and its implications for the GDH sum rule |
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