Effects of chiral three-nucleon forces on 4 He-nucleus scattering in a wide range of incident energies

Masakazu Toyokawa, Masanobu Yahiro, Takuma Matsumoto, Michio Kohno

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Abstract

An important current subject is to clarify the properties of chiral three-nucleon forces (3NFs) not only in nuclear matter but also in scattering between finite-size nuclei. Particularly for elastic scattering, this study has just started and the properties are not understood for a wide range of incident energies (E in ). We investigate basic properties of chiral 3NFs in nuclear matter with positive energies by using the Brueckner-Hartree-Fock method with chiral two-nucleon forces at N 3 LO and 3NFs at NNLO, and analyze the effects of chiral 3NFs on 4 He elastic scattering from targets 208 Pb, 58 Ni, and 40 Ca over a wide range of 30 < E in /A P < 200 MeV by using the g-matrix folding model, where A P is the mass number of the projectile. In symmetric nuclear matter with positive energies, chiral 3NFs make the single-particle potential less attractive and more absorptive. The effects mainly come from the Fujita-Miyazawa 2π-exchange 3NF and become slightly larger as E in increases. These effects persist in the optical potentials of 4 He scattering. As for the differential cross sections of 4 He scattering, chiral-3NF effects are large for E in /A P > 60 MeV and mprove the agreement of the theoretical results with the measured ones. Particularly for E in /A P > 100 MeV, the folding model reproduces measured differential cross sections pretty well. Cutoff (Λ) dependence is investigated for both nuclear matter and 4 He scattering by considering two cases of Λ = 450 and 550 MeV. The uncertainty coming from the dependence is smaller than chiral-3NF effects even at E in /A P = 175 MeV.

Original languageEnglish
Article number023D03
JournalProgress of Theoretical and Experimental Physics
Volume2018
Issue number2
DOIs
Publication statusPublished - Feb 1 2018

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nuclei
scattering
folding
elastic scattering
energy
cross sections
projectiles
cut-off
matrices

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Effects of chiral three-nucleon forces on 4 He-nucleus scattering in a wide range of incident energies . / Toyokawa, Masakazu; Yahiro, Masanobu; Matsumoto, Takuma; Kohno, Michio.

In: Progress of Theoretical and Experimental Physics, Vol. 2018, No. 2, 023D03, 01.02.2018.

Research output: Contribution to journalArticle

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