Validity of the distorted-wave impulse-approximation description of Ca40(e,e'p)K39 data using only ingredients from a nonlocal dispersive optical model

Atkinson, M. C.; Blok, H. P.; Lapikás, L.; Charity, R. J.; Dickhoff, W. H.

doi:10.1103/physrevc.98.044627

Title: Validity of the distorted-wave impulse-approximation description of ${}^{40}{Ca} (e, e^{'} p) {}^{39}K$ data using only ingredients from a nonlocal dispersive optical model

Journal Article · Wed Oct 31 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.98.044627· OSTI ID:1610081

Atkinson, M. C. ^[1]; Blok, H. P. ^[2]; Lapikás, L. ^[3]; Charity, R. J. ^[1]; Dickhoff, W. H. ^[1]

Washington Univ., St. Louis, MO (United States)
National Inst. for Subatomic Physics (Nikhef), Amsterdam (The Netherlands); VU Univ., Amsterdam (The Netherlands)
National Inst. for Subatomic Physics (Nikhef), Amsterdam (The Netherlands)

The nonlocal implementation of the dispersive optical model (DOM) provides all the ingredients for distorted-wave impulse-approximation (DWIA) calculations of the (e,e'p) reaction. It provides both the overlap function, including its normalization, and the outgoing proton distorted wave. This framework is applied to describe the knockout of a proton from the 0d3/2 and 1s1/2 orbitals in ⁴⁰Ca with fixed normalizations of 0.71 and 0.60, respectively. Data were obtained in parallel kinematics for three outgoing proton energies: 70, 100, and 135 MeV. Agreement with the data is as good as, or better than, previous descriptions employing local optical potentials and overlap functions from Woods-Saxon potentials—both with standard nonlocality corrections—whose normalization (spectroscopic factor) and radius were fitted to the data. The present analysis suggests that slightly larger spectroscopic factors are obtained when nonlocal optical potentials are employed than those generated with local potentials. The results further suggest that the chosen kinematical window around 100 MeV proton energy provides the best and cleanest method to employ the DWIA for the analysis of this reaction. The conclusion that substantial ground-state correlations cannot be ignored when describing a closed-shell atomic nucleus is therefore confirmed in detail. To reach these conclusions, it is essential to have a complete description of the nucleon single-particle propagator that accounts for all elastic nucleon-scattering observables in a wide energy domain up to 200 MeV. Lastly, the current nonlocal implementation of the DOM fulfills this requirement.

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Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-87ER40316

OSTI ID:: 1610081

Alternate ID(s):: OSTI ID: 1480156

Journal Information:: Physical Review C, Vol. 98, Issue 4; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Title: Validity of the distorted-wave impulse-approximation description of Ca 40 ( e , e ' p ) K 39 data using only ingredients from a nonlocal dispersive optical model

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