Photo- and electro-disintegration of {sup 3}He at threshold and pd radiative capture

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The present work reports results for: (1) pd radiative capture observables measured at center-of-mass (c.m.) energies in the range 0--100 keV and at 2 MeV by the TUNL and Wisconsin groups, respectively; (2) contributions to the Gerasimov-Drell-Hearn (GDH) integral in {sup 3}He from the two- up to the three-body breakup thresholds, compared to experimental determinations by the TUNL group in this threshold region; (3) longitudinal, transverse, and interference response functions measured in inclusive polarized electron scattering off polarized {sup 3}He at excitation energies below the threshold for breakup into ppn, compared to unpolarized longitudinal and transverse data from the Saskatoon ... continued below

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3412 Kilobytes pages

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Viviani, M.; Kievsky, A.; Marcucci, L.E.; Rosati, S. & Schiavilla, R. November 1, 1999.

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The present work reports results for: (1) pd radiative capture observables measured at center-of-mass (c.m.) energies in the range 0--100 keV and at 2 MeV by the TUNL and Wisconsin groups, respectively; (2) contributions to the Gerasimov-Drell-Hearn (GDH) integral in {sup 3}He from the two- up to the three-body breakup thresholds, compared to experimental determinations by the TUNL group in this threshold region; (3) longitudinal, transverse, and interference response functions measured in inclusive polarized electron scattering off polarized {sup 3}He at excitation energies below the threshold for breakup into ppn, compared to unpolarized longitudinal and transverse data from the Saskatoon group. The calculations are based on pair-correlated-hyperspherical-harmonics bound and continuum wave functions obtained from a realistic Hamiltonian consisting of the Argonne {upsilon}{sub 18} two-nucleon and Urbana IX three-nucleon interactions. The electromagnetic current operator includes one- and two- body components, leading terms of which are constructed from the Argonne {upsilon}{sub 18} interaction (specifically, its charge-independent part). Two-body currents associated with {Delta}-isobar degrees of freedom are treated non-perturbatively via the transition-correlation-operator method. The theoretical predictions obtained by including only one-body currents are in violent disagreement with data. These differences between theory and experiment are, to a large extent, removed when two-body currents are taken into account, although some rather large discrepancies remain in the c.m. energy range 0--100 keV, particularly for the pd differential cross section {sigma}({theta}) and tensor analyzing power T{sub 20}({theta}) at small angles, and contributions to the GDH integral. A rather detailed analysis indicated that these discrepancies have, in large part, a common origin, and can be traced back to an excess strength obtained in the theoretical calculation of the E{sub 1} reduced matrix element associated with the pd channel having L,S,J = 1, 1/2, 3/2. It is suggested that this lack of E{sub 1} strength observed experimentally might have implications for the nuclear interaction at very low energies. Finally, the validity of the long-wavelength approximation for electric dipole transitions is discussed.

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3412 Kilobytes pages

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  • Journal Name: submitted to Phys. Rev. C; Other Information: Submitted to Phys. Rev. C

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  • Report No.: DOE/ER/40150-1437
  • Report No.: JLAB-THY-99-36
  • Report No.: nucl-th/9911051
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 755325
  • Archival Resource Key: ark:/67531/metadc704783

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  • November 1, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 22, 2016, 1:27 p.m.

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Viviani, M.; Kievsky, A.; Marcucci, L.E.; Rosati, S. & Schiavilla, R. Photo- and electro-disintegration of {sup 3}He at threshold and pd radiative capture, article, November 1, 1999; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc704783/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.