Roles of chiral three-nucleon forces in nucleon–nucleus scattering

Toyokawa, Masakazu; Minomo, Kosho; Kohno, M.; Yahiro, Masanobu

doi:10.1088/0954-3899/42/2/025104

Cited by 18 publications

(21 citation statements)

References 82 publications

(172 reference statements)

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“…Nowadays, N -A scattering observables can be described microscopically with no free adjustable parameter [8][9][10]. It is thus expected that the microscopic CDCC calculation can describe deuteron elastic scattering data that have successfully been reproduced by CDCC with phenomenological N -A optical potentials [1].…”

Section: Introductionmentioning

confidence: 99%

Microscopic effective reaction theory for deuteron-induced reactions

et al. 2016

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The microscopic effective reaction theory is applied to deuteron-induced reactions. A reaction model-space characterized by a p + n + A three-body model is adopted, where A is the target nucleus, and the nucleon-target potential is described by a microscopic folding model based on an effective nucleon-nucleon interaction in nuclear medium and a one-body nuclear density of A. The three-body scattering wave function in the model space is obtained with the continuum-discretized coupled-channels method (CDCC), and the eikonal reaction theory (ERT), an extension of CDCC, is applied to the calculation of neutron removal cross sections. Elastic scattering cross sections of deuteron on 58 Ni and 208 Pb target nuclei at several energies are compared with experimental data. The total reaction cross sections and the neutron removal cross sections at 56 MeV on 14 target nuclei are calculated and compared with experimental values.

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Section: Introductionmentioning

confidence: 99%

Microscopic effective reaction theory for deuteron-induced reactions

et al. 2016

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“…where the parameters U 0 (E), W 0 (E), R r,i and a r,i vary smoothly with the mass number A of the target nucleus and the projectile energy E. Recently chiral two-and three-nucleon forces have been used to compute the real and imaginary volume components of the optical potential for isospin-symmetric nuclear systems [12,13]. Although the strength and energy dependence of the real component was found to be in good agreement with modern phenomenological parametrizations [21], the absorptive strength of the imaginary part from microscopic nuclear potentials was about a factor of two larger than that from phenomenology.…”

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confidence: 99%

Microscopic optical potential for exotic isotopes from chiral effective field theory

2016

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We compute the isospin-asymmetry dependence of microscopic optical model potentials from realistic chiral two-and three-body interactions over a range of resolution scales Λ 400 − 500 MeV. We show that at moderate projectile energies, Einv = 110 − 200 MeV, the real isovector part of the optical potential changes sign, a phenomenon referred to as isospin inversion. We also extract the strength and energy dependence of the imaginary isovector optical potential and find no evidence for an analogous phenomenon over the range of energies, E ≤ 200 MeV, considered in the present work. Finally, we compute for the first time the leading corrections to the Lane parametrization for the isospin-asymmetry dependence of the optical potential and observe an enhanced importance at low scattering energies.Introduction -The structure and dynamics of neutronrich nuclei are key inputs for modeling neutron stars, core-collapse supernovae and r-process nucleosynthesis [1][2][3][4][5][6][7][8]. Elucidating the properties of highly isospinasymmetric nuclear matter is therefore a priority in lowenergy nuclear science research and a major motivation for the development of next-generation radioactive ion beam (RIB) facilities. Microscopic many-body methods [9-11] with chiral two-and three-body forces have been successful in describing the bound-state properties of neutron-rich matter. Complementary and consistent nuclear reaction models are under development [12][13][14], and of these, global optical potentials aim to address the broadest theory needs for interpreting RIB scattering experiments and simulating r-process nucleosynthesis. In fact, current modeling of the strong r-process favors a cold scenario in binary neutron star mergers [6][7][8][15][16][17], where mass transfer to highly neutron-rich isotopes occurs and freeze-out is achieved more rapidly, which enhances the importance of radiative neutron capture processes in determining the final abundance pattern of rprocess elements [18].

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“…In this paper, we use the Melbourne g-matrix interaction modified with the chiral 3NF effects [11,18]. Although a g matrix contains an effect of single-particle excitation in nuclear matter, collective excitation for a specific nucleus is not adequately included.…”

Section: Framework Of Coupled-channels Calculationmentioning

confidence: 99%

“…[11,18], the Melbourne interaction was modified according to the effects of the chiral NNLO 3NF [19,20], based on the knowledge that g-matrices from the Bonn potential and the chiral 2NF are resembling; see Refs. [11,18] for details. The chiral 3NF effects make the real (imaginary) part of the folding potential less attractive (much absorptive).…”

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Microscopic coupled-channels calculations of nucleus-nucleus scattering including chiral three-nucleon-force effects

2016

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We analyze16 O-16 O and 12 C-12 C scattering with the microscopic coupled-channels method and investigate the coupled-channels and three-nucleon-force (3NF) effects on elastic and inelastic cross sections. In the microscopic coupled-channels calculation, the Melbourne g-matrix interaction modified according to the chiral 3NF effects is used. It is found that the coupled-channels and 3NF effects additively change both the elastic and inelastic cross sections. As a result, the coupled-channels calculation including the 3NF effects significantly improves the agreement between the theoretical results and the experimental data. The incident-energy dependence of the coupled-channels and 3NF effects is also discussed. Introduction. Microscopic description of many-body nuclear reactions is a long standing subject in nuclear physics. Elastic scattering, which is one of the most basic processes, was first understood phenomenologically with the optical model. The model was founded by the multiple scattering theory [1-3] from the microscopic point of view. According to the theory, elastic scattering is described by multistep processes with a nucleon-nucleon effective interaction. So far many types of density-dependent complex interactions (gmatrix interactions) have been proposed as effective interactions based on the Brueckner theory. It is, however, still not easy to reproduce even the elastic scattering data microscopically.

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Roles of chiral three-nucleon forces in nucleon–nucleus scattering

Cited by 18 publications

References 82 publications

Microscopic effective reaction theory for deuteron-induced reactions

Microscopic effective reaction theory for deuteron-induced reactions

Microscopic optical potential for exotic isotopes from chiral effective field theory

Microscopic coupled-channels calculations of nucleus-nucleus scattering including chiral three-nucleon-force effects

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