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Title: Impact of three-body forces on elastic nucleon-nucleus scattering observables

Abstract

In a previous series of papers we investigated the domain of applicability of chiral potentials to the construction of a microscopic optical potential (OP) for elastic nucleon-nucleus scattering. The OP was derived at the first order of the spectator expansion of the Watson multiple scattering theory and its final expression was a folding integral between the nucleon-nucleon ( N N ) t matrix and the nuclear density of the target. In the calculations N N and three-nucleon ( 3 N ) chiral interactions were used for the target density and only the N N interaction for the N N t matrix. The purpose of this study is to achieve another step towards the calculation of a more consistent OP introducing the 3 N force also in the dynamic part of the OP. The full treatment of the 3 N interaction is beyond our present capabilities. Thus, here it is approximated with a density dependent N N interaction obtained after the averaging over the Fermi sphere. In practice, in our model the 3 N force acts as a medium correction of the bare N N interaction used to calculate the t matrix. Even if the 3 N force is treated in an approximate way, this method naturally extends our previous model of the OP and allows a direct comparison of our present and previous results. We consider as case studies the elastic scattering of nucleons off C 12 and O 16 . We present results for the differential cross section and the spin observables for different values of the projectile energy. From the comparison with the experimental data and with the results of our previous model we assess the importance of the 3 N interaction in the dynamic part of the OP. Conclusions: Our analysis indicates that the contribution of the 3 N force in the t matrix is small for the differential cross section and it is sizable for the spin observables, in particular, for the analyzing power. We find that the two-pion exchange term is the major contributor to the 3 N force. A chiral expansion order-by-order analysis of the scattering observables confirms the convergence of our results at the next-to-next-to-next-to-leading-order, as already established in our previous work.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center (NNDC)
  2. Univ. of Victoria, BC (Canada); TRIUMF, Vancouver, BC (Canada)
  3. Univ. degli Studi di Bologna (Italy); National Inst. of Nuclear Physics (INFN), Bologna (Italy)
  4. Univ. degli Studi di Pavia (Italy); National Inst. of Nuclear Physics (INFN), Pavia (Italy)
  5. TRIUMF, Vancouver, BC (Canada)
  6. Univ. of Idaho, Moscow, ID (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Idaho, Moscow, ID (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences and Engineering Research Council of Canada (NSERC); National Research Council of Canada (NRC)
OSTI Identifier:
1765667
Alternate Identifier(s):
OSTI ID: 1820915
Report Number(s):
BNL-221004-2021-JAAM
Journal ID: ISSN 2469-9985; TRN: US2206266
Grant/Contract Number:  
SC0012704; AC02-98CH10886; FG02-03ER41270; SAPIN-2016-00033
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C
Additional Journal Information:
Journal Volume: 103; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; direct reactions; nucleon induced nuclear reactions

Citation Formats

Vorabbi, Matteo, Gennari, Michael, Finelli, Paolo, Giusti, Carlotta, Navrátil, Petr, and Machleidt, Ruprecht. Impact of three-body forces on elastic nucleon-nucleus scattering observables. United States: N. p., 2021. Web. doi:10.1103/physrevc.103.024604.
Vorabbi, Matteo, Gennari, Michael, Finelli, Paolo, Giusti, Carlotta, Navrátil, Petr, & Machleidt, Ruprecht. Impact of three-body forces on elastic nucleon-nucleus scattering observables. United States. https://doi.org/10.1103/physrevc.103.024604
Vorabbi, Matteo, Gennari, Michael, Finelli, Paolo, Giusti, Carlotta, Navrátil, Petr, and Machleidt, Ruprecht. Tue . "Impact of three-body forces on elastic nucleon-nucleus scattering observables". United States. https://doi.org/10.1103/physrevc.103.024604. https://www.osti.gov/servlets/purl/1765667.
@article{osti_1765667,
title = {Impact of three-body forces on elastic nucleon-nucleus scattering observables},
author = {Vorabbi, Matteo and Gennari, Michael and Finelli, Paolo and Giusti, Carlotta and Navrátil, Petr and Machleidt, Ruprecht},
abstractNote = {In a previous series of papers we investigated the domain of applicability of chiral potentials to the construction of a microscopic optical potential (OP) for elastic nucleon-nucleus scattering. The OP was derived at the first order of the spectator expansion of the Watson multiple scattering theory and its final expression was a folding integral between the nucleon-nucleon (NN) t matrix and the nuclear density of the target. In the calculations NN and three-nucleon (3N) chiral interactions were used for the target density and only the NN interaction for the NN t matrix. The purpose of this study is to achieve another step towards the calculation of a more consistent OP introducing the 3N force also in the dynamic part of the OP. The full treatment of the 3N interaction is beyond our present capabilities. Thus, here it is approximated with a density dependent NN interaction obtained after the averaging over the Fermi sphere. In practice, in our model the 3N force acts as a medium correction of the bare NN interaction used to calculate the t matrix. Even if the 3N force is treated in an approximate way, this method naturally extends our previous model of the OP and allows a direct comparison of our present and previous results. We consider as case studies the elastic scattering of nucleons off C12 and O16. We present results for the differential cross section and the spin observables for different values of the projectile energy. From the comparison with the experimental data and with the results of our previous model we assess the importance of the 3N interaction in the dynamic part of the OP. Conclusions: Our analysis indicates that the contribution of the 3N force in the t matrix is small for the differential cross section and it is sizable for the spin observables, in particular, for the analyzing power. We find that the two-pion exchange term is the major contributor to the 3N force. A chiral expansion order-by-order analysis of the scattering observables confirms the convergence of our results at the next-to-next-to-next-to-leading-order, as already established in our previous work.},
doi = {10.1103/physrevc.103.024604},
journal = {Physical Review. C},
number = 2,
volume = 103,
place = {United States},
year = {Tue Feb 02 00:00:00 EST 2021},
month = {Tue Feb 02 00:00:00 EST 2021}
}

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