Phenomenological and microscopic optical model analyses of the interaction of low-energy nucleons with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nb</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>93</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Lagrange, Ch.; Lejeune, Aude

doi:10.1103/physrevc.25.2278

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…The microscopic imaginary term has a large central depth with almost no surface peak, while its phenomenological counterpart has a small central depth and moderate surface peak. This feature has been observed in other microscopic optical potentials calculated from nuclear matter [48][49][50][51]. To mitigate this discrepancy, some semi-microscopic optical potentials apply an energy-dependent scaling factor to the imaginary term [31,52], but in the present work we employ no such factors.…”

Section: Improved Local Density Approximationmentioning

confidence: 71%

“…For instance, at the scattering energy E = 35 MeV, the surface peak has essentially vanished in the microscopic calculation, and the remaining "volume" imaginary part is large compared to phenomenology. In fact, this is a common feature [4,6,60,61] in microscopic optical potentials computed in the nuclear matter approach. Modern semimicroscopic optical potentials therefore include empirical energy-dependent strength factors multiplying the real and imaginary central parts [7,9].…”

Section: Kd Globalmentioning

confidence: 82%

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Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials

2019

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We formulate microscopic neutron-nucleus optical potentials from many-body perturbation theory based on chiral two-and three-body forces. The neutron self energy is first calculated in homogeneous matter to second order in perturbation theory, which gives the central real and imaginary terms of the optical potential. The real spin-orbit term is calculated separately from the density matrix expansion using the same chiral interaction as in the self energy. Finally, the full neutronnucleus optical potential is derived within the improved local density approximation utilizing mean field models consistent with the chiral nuclear force employed. We compare the results of the microscopic calculations to phenomenological models and experimental data up to projectile energies of E = 200 MeV. Experimental elastic differential scattering cross sections and vector analyzing powers are generally well reproduced by the chiral optical potential, but we find that total cross sections are overestimated at high energies.

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Section: Improved Local Density Approximationmentioning

confidence: 71%

Section: Kd Globalmentioning

confidence: 82%

Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials

2019

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“…que nous avons obtenue est proche de celle r6cemment d6termin6e [19] dans 1'analyse de la diffusion 61astique de nucl6ons par 93Nb. Les facteurs de renormalisation des differents potentiels sont aussi proches de ceux ant6rieurement deduits par Lejeune et Hodgson [20] de leurs analyses de la diffusion 61astique de nucl6ons par un ensemble de noyaux (A =12 -209) a diverses energies.…”

Section: Discussion Et Conclusion -La Param6trisationunclassified

Interprétation semi-microscopique de la diffusion élastique et inélastique de nucléons par 208Pb

Lagrange

Brient

1983

J. Phys. France

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Reçu le 30 juin 1982, révisé le 2 août, accepté le 27 septembre 1982) Résumé. 2014 Partant du potentiel optique microscopique calculé dans la matière nucléaire par Jeukenne, Lejeune et Mahaux, nous interprétons la diffusion élastique et inélastique de nucléons par 208Pb dans le domaine d'énergie 8,5 MeV-61 MeV. Nous insistons en particulier sur la dépendance en énergie de la probabilité d'excitation du premier état excité. Abstract. 2014 Starting from the calculations by Jeukenne, Lejeune and Mahaux of the optical potential in nuclear matter, a microscopic calculation for elastic and inelastic nucleon scattering from 208Pb in the energy range 8.5-61 MeV is presented. A special consideration is given to the energy dependence of the nucleon excitation strength for the first inelastic channel.

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“…This leads to larger total reaction cross sections [73] compared to phenomenology and experiment. This is in fact a general feature of the microscopic nuclear matter approach [77,78] independent of the choice of nuclear potential, and previous works [74,79] have attempted to mitigate this deficiency by introducing scaling factors for the imaginary part.…”

Section: Nucleon-nucleus Optical Potentialsmentioning

confidence: 99%

Implementing Chiral Three-Body Forces in Terms of Medium-Dependent Two-Body Forces

2020

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Three-nucleon (3N) forces are an indispensable ingredient for accurate few-body and many-body nuclear structure and reaction theory calculations. While the direct implementation of chiral 3N forces can be technically very challenging, a simpler approach is given by employing instead a medium-dependent NN interaction V med that reflects the physics of three-body forces at the two-body normal-ordered approximation. We review the derivation and construction of V med from the chiral 3N interaction at next-to-next-to-leading order (N2LO), consisting of a long-range 2π-exchange term, a mid-range 1π-exchange component, and a short-range contact-term. Several applications of V med to the equation of state of cold nuclear and neutron matter, the nucleon single-particle potential in nuclear matter, and the nuclear quasiparticle interaction are discussed. We also explore differences in using local vs. non-local regulating functions on 3N forces and make direct comparisons to exact results at low order in perturbation theory expansions for the equation of state and single-particle potential. We end with a discussion and numerical calculation of the in-medium NN potential V med from the next-to-next-to-next-to-leading order (N3LO) chiral 3N force, which consists of a series of long-range and short-range terms.

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Phenomenological and microscopic optical model analyses of the interaction of low-energy nucleons withNb93

Cited by 14 publications

References 31 publications

Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials

Proton elastic scattering on calcium isotopes from chiral nuclear optical potentials

Interprétation semi-microscopique de la diffusion élastique et inélastique de nucléons par 208Pb

Implementing Chiral Three-Body Forces in Terms of Medium-Dependent Two-Body Forces

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