Effect of spin-spin interactions on nucleon-nucleus scattering

Cunningham, E. S.; Al-Khalili, Jim; Johnson, R.C.

doi:10.1103/physrevc.87.054601

Cited by 5 publications

(4 citation statements)

References 69 publications

(153 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taking the complete N N interaction into account in the leading order term implies that not only the spin of the projectile has to be considered but also the spin of the struck target nucleon. In the context of full-folding effective interactions this has not been done according to our knowledge, though the same idea was pioneered in the context of spin-spin terms in elastic scattering from a target with non-zero spin [26,27].…”

Section: Discussionmentioning

confidence: 99%

“…The idea that an effective interaction may depend on the spin of the struck target nucleon was pioneered in [26,27] in the context of spin-spin terms in elastic scattering from a target with nonzero spin, in which the authors use as a starting point for the nuclear structure a core and valence nucleons. However, even when considering scattering of a proton or neutron from a spin-zero nucleus, as done in this work, the spin of the struck target nucleon should be taken into account when employing the N N interaction on the same footing as in a modern structure calculation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ab initio Leading Order Effective Potentials for Elastic Nucleon-Nucleus Scattering

Burrows,

Baker,

Elster

et al. 2020

Preprint

View full text Add to dashboard Cite

Background: Calculating microscopic effective interactions (optical potentials) for elastic nucleon-nucleus scattering has already in the past led to a large body of work. For first-order calculations a nucleon-nucleon (NN ) interaction and a one-body density of the nucleus were taken as input to rigorous calculations of microscopic full-folding calculations.Purpose: Based on the spectator expansion of the multiple scattering series we employ a chiral next-to-next-toleading order (NNLO) nucleon-nucleon interaction on the same footing in the structure as well as in the reaction calculation to obtain an in leading-order consistent effective potential for nucleon-nucleus elastic scattering, which includes the spin of the struck target nucleon. Methods:The first order effective folding potential is computed by first deriving a nonlocal scalar density as well as a spin-projected momentum distribution. Those are then integrated with the off-shell Wolfenstein amplitudes A, C, and M . The resulting nonlocal potential serves as input to a momentum-space Lippmann-Schwinger equation, whose solutions are summed to obtain the nucleon-nucleus scattering observables.Results: We calculate elastic scattering observables for 4 He, 6 He, 8 He, 12 C, and 16 O in the energy regime between 100 and 200 MeV projectile kinetic energy, and compare to available data. We also explore the extension down to about 70 MeV, and study the effect of ignoring the spin of the struck nucleon in the nucleus. Conclusions:In our calculations we contrast elastic scattering off closed-shell and open-shell nuclei. We find that for closed-shell nuclei the approximation of ignoring the spin of the struck target nucleon is excellent. We only see effects of the spin of the struck target nucleon when considering 6 He and 8 He, which are nuclei with a N/Z ratio larger than 1.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ab initio Leading Order Effective Potentials for Elastic Nucleon-Nucleus Scattering

Burrows,

Baker,

Elster

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…This is likely different for nuclei with ground states of nonzero spin, which was explored for 10 B polarization transfer observables in Ref. [63,64], where the authors assume a nuclear structure which consists of a core and valence nucleons. The work of Ref.…”

Section: Leading Order Ab Initio Optical Potential Based On a Chiral ...mentioning

confidence: 99%

Chiral uncertainties in ab initio elastic nucleon-nucleus scattering

Baker¹,

Burrows²,

Elster³

et al. 2023

Front. Phys.

View full text Add to dashboard Cite

The effective interaction between a nucleon and a nucleus is one of the most important ingredients for reaction theories. Theoretical formulations were introduced early by Feshbach and Watson, and efforts of deriving and computing those ‘optical potentials’ in a microscopic fashion have a long tradition. However, only recently the leading order term in the Watson multiple scattering approach could be calculated fully ab initio, meaning that the same nucleon-nucleon (NN) interaction enters both the structure as well as the reaction pieces on equal footing. This allows the uncertainties from the underlying chiral effective NN interaction to be systematically explored in nucleon-nucleus elastic scattering observables. In this contribution the main ingredients for arriving at the ab initio leading order of the effective nucleon-nucleus interaction in the Watson approach will be reviewed. Concentrating on one specific chiral NN interaction from the LENPIC collaboration and light nuclei with a 0+ ground state, the leading order nucleon-nucleus interaction is calculated using up to the third chiral order (N2LO) in the nucleon-nucleon potential, and elastic scattering observables are extracted. Then pointwise as well as correlated uncertainty quantification is used for the estimation of the chiral truncation error. Elastic scattering observables for 4He, 12C, and 16O for between 65 and 200 MeV projectile energy will be analyzed.

show abstract

“…Dissipation hinders fission, which results in an excess of observed prescission light particles and a large evaporation residue cross section with respect to predictions of standard statistical models [6][7][8][9]. Accordingly, information on dissipation is obtained by comparing theoretical calculations with experimental measurements [10][11][12][13]. It has been demonstrated [14][15][16][17][18][19][20][21][22][23][24] that stochastic approaches are a suitable framework to address a great number of observables, including particle multiplicities and evaporation residue cross sections for a lot of compound nuclei (CNs) over a broad range of excitation energy, angular momentum and fissility.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

田舰¹,

叶巍²

2016

Chinese Phys. C

View full text Add to dashboard Cite

Using the stochastic Langevin model coupled with a statistical decay model, we study the influence of pre-equilibrium (PE) emission on probing postsaddle friction (β) with neutrons. A postsaddle friction value of (14−16.5) ×10 21 s −1 and (11−13) ×10 21 s −1 is obtained from comparing calculated and measured prescission neutron multiplicities of heavy fissioning systems 248 Fm and 256 Fm in the absence and presence of the deformation factor. Moreover, it is found that a larger β is required to fit multiplicity data after the PE effect is accounted for, and that the effect becomes stronger when more energy is removed by PE particles. Our findings suggest that, to more accurately determine the postsaddle friction strength through the measurement of prescission neutrons, in addition to incorporating the contribution of PE evaporation source into the experimental multi-source analysis for particle energy spectra in coincidence with fission fragments, on the theoretical side, it is very important to make a precise evaluation of the energy that PE emission carries away from excited compound systems produced in heavy-ion fusion reactions.

show abstract

Effect of spin-spin interactions on nucleon-nucleus scattering

Cited by 5 publications

References 69 publications

Ab initio Leading Order Effective Potentials for Elastic Nucleon-Nucleus Scattering

Ab initio Leading Order Effective Potentials for Elastic Nucleon-Nucleus Scattering

Chiral uncertainties in ab initio elastic nucleon-nucleus scattering

Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

Contact Info

Product

Resources

About