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Title: Interplay of dynamical and structure effects in the observables for 12C( p,2p) near 400 MeV with polarized and unpolarized beams

Abstract

We investigate the interplay of reaction mechanism and structure effects in the calculated cross sections and polarization observables for the direct 12C( p,2p) reaction at 400 MeV around the Quasi Free Scattering (QFS) kinematical condition. We do the first consistent comparison between the scattering observables obtained from solving the three-body Faddeev/Alt-Grassberger-Sandhas (F/AGS) equations and using the Distorted-Wave Impulse Approximation (DWIA). We explore structure effects on the calculated observables, making use of one-nucleon spectroscopic overlaps obtained from the quantum Monte Carlo (QMC) many-body wave functions and using a Woods-Saxon parametrization with parameters adjusted to experimental (p, 2p) data. We show, for the first time, that the two reaction formalisms appear to exhibit a distinct behavior depending upon the kinematic conditions. We also show that the agreement between the experimental data and the theoretical results depends on the reaction formalism, kinematical conditions and optical model parametrizations in addition to the spectroscopic factors (SFs). The agreement between the data and predictions using QMC wave functions diminishes prominently for transitions to excited states of 11B.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [4]; ORCiD logo [2];  [5];  [6]
  1. Univ. de Lisboa, Lisboa (Portugal); Univ. de Lisboa, Bobadela (Portugal)
  2. Univ. de Lisboa, Lisboa (Portugal)
  3. Vilnius Univ., Vilnius (Lithuania)
  4. Stellenbosh Univ. (South Africa); iThemba Lab. for Accelerator Based Sciences (South Africa)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Kyushu Univ., Fukuoka (Japan)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Fundacao para a Ciencia ea Tecnologia of Portugal; Alexander von Humboldt Foundation; USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21). Scientific Discovery through Advanced Computing (SciDAC)
OSTI Identifier:
1567912
Alternate Identifier(s):
OSTI ID: 1571919
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 798; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; (p, pN) reactions; few-body reaction; many-body ab initio structure; polarization

Citation Formats

Mecca, A., Cravo, E., Deltuva, A., Crespo, Raquel, Cowley, A. A., Arriaga, A., Wiringa, R. B., and Noro, T. Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams. United States: N. p., 2019. Web. doi:10.1016/j.physletb.2019.134989.
Mecca, A., Cravo, E., Deltuva, A., Crespo, Raquel, Cowley, A. A., Arriaga, A., Wiringa, R. B., & Noro, T. Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams. United States. doi:10.1016/j.physletb.2019.134989.
Mecca, A., Cravo, E., Deltuva, A., Crespo, Raquel, Cowley, A. A., Arriaga, A., Wiringa, R. B., and Noro, T. Tue . "Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams". United States. doi:10.1016/j.physletb.2019.134989.
@article{osti_1567912,
title = {Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams},
author = {Mecca, A. and Cravo, E. and Deltuva, A. and Crespo, Raquel and Cowley, A. A. and Arriaga, A. and Wiringa, R. B. and Noro, T.},
abstractNote = {We investigate the interplay of reaction mechanism and structure effects in the calculated cross sections and polarization observables for the direct 12C(p,2p) reaction at 400 MeV around the Quasi Free Scattering (QFS) kinematical condition. We do the first consistent comparison between the scattering observables obtained from solving the three-body Faddeev/Alt-Grassberger-Sandhas (F/AGS) equations and using the Distorted-Wave Impulse Approximation (DWIA). We explore structure effects on the calculated observables, making use of one-nucleon spectroscopic overlaps obtained from the quantum Monte Carlo (QMC) many-body wave functions and using a Woods-Saxon parametrization with parameters adjusted to experimental (p, 2p) data. We show, for the first time, that the two reaction formalisms appear to exhibit a distinct behavior depending upon the kinematic conditions. We also show that the agreement between the experimental data and the theoretical results depends on the reaction formalism, kinematical conditions and optical model parametrizations in addition to the spectroscopic factors (SFs). The agreement between the data and predictions using QMC wave functions diminishes prominently for transitions to excited states of 11B.},
doi = {10.1016/j.physletb.2019.134989},
journal = {Physics Letters B},
number = C,
volume = 798,
place = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.134989

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