Measurement of spin observables in neutron-proton elastic scattering

Arnold, J.; Brandt, B. van den; Daum, M.; Demierre, Ph.; Фингер, М.; Franz, J.; Goujon-Naef, N.; Hautle, P.; Heß, R.; Janata, A.; Konter, J.A.; Lacker, H. M.; Lechanoine‐Leluc, C.; Lehar, F.; Mango, S.; Rapin, D.; Rössle, E.; Schmelzbach, P.A.; Schmitt, H.; Sereni, P.; Slunečka, M.; Teglia, A.; Vuaridel, B.

doi:10.1007/s100520000465

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…Starting from N 4 LO, we found that setting the maximum fitting energy E max lab ∼ 250 MeV leads to stable results for the LECs and phase shifts for all employed cutoff values in the range of Λ = 350 − 550 MeV. Given the abundance of np spin-observables available at the energies around E lab ∼ 260 MeV and coming from the recent experiments of [94][95][96], we decided to set E max lab = 260 MeV at this chiral order. We will address the sensitivity of our results on the choice of E max lab in section VII E. At N 3 LO, we fit up to E lab = 200 MeV while the maximum energy of included scattering data at LO, NLO and N 2 LO is chosen to be E lab = 25, 100 and 125 MeV.…”

Section: Fitting Proceduresmentioning

confidence: 99%

Semilocal momentum-space regularized chiral two-nucleon potentials up to fifth order

2018

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We introduce new semilocal two-nucleon potentials up to fifth order in the chiral expansion. We employ a simple regularization approach for the pion-exchange contributions which (i) maintains the long-range part of the interaction, (ii) is implemented in momentum space and (iii) can be straightforwardly applied to regularize many-body forces and current operators. We discuss in detail the two-nucleon contact interactions at fourth order and demonstrate that three terms out of fifteen used in previous calculations can be eliminated via suitably chosen unitary transformations. The removal of the redundant contact terms results in a drastic simplification of the fits to scattering data and leads to interactions which are much softer (i.e. more perturbative) than our recent semilocal coordinate-space regularized potentials. Using the pion-nucleon low-energy constants from matching pion-nucleon Roy-Steiner equations to chiral perturbation theory, we perform a comprehensive analysis of nucleon-nucleon scattering and the deuteron properties up to fifth chiral order and study the impact of the leading F-wave two-nucleon contact interactions which appear at sixth order. The resulting chiral potentials lead to an outstanding description of the proton-proton and neutron-proton scattering data from the self-consistent Granada-2013 database below the pion production threshold, which is significantly better than for any other chiral potential. For the first time, the chiral potentials match in precision and even outperform the available high-precision phenomenological potentials, while the number of adjustable parameters is, at the same time, reduced by about ∼ 40%. Last but not least, we perform a detailed error analysis and, in particular, quantify for the first time the statistical uncertainties of the fourth-and the considered sixth-order contact interactions.

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Section: Fitting Proceduresmentioning

confidence: 99%

Semilocal momentum-space regularized chiral two-nucleon potentials up to fifth order

2018

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“…(10a)-(10c). Since there is few experimental data of corresponding pn observables [25], the uncertainty in the pn amplitudes used in this work is not small. Thus, I have evaluated the pn amplitudes inversely from the calculated response functions, R c , R L , and R T , and the experimental data of I(0 • ), D N N (0 • ), and D LL (0 statistical ones with respect to the averaging procedure, and effects of the experimental error are not taken into account.…”

Section: Resultsmentioning

confidence: 99%

Spin–isospin excitation of 3He with three-proton final state

Ishikawa

2018

Progress of Theoretical and Experimental Physics

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Spin-isospin excitation of 3 He nucleus by proton-induced charge-exchange reaction, 3 He(p, n)ppp, at forward neutron scattering angle is studied in a plane wave impulse approximation (PWIA). In PWIA, cross sections of the reaction is written in terms of proton-neutron scattering amplitudes and response functions of the transition from 3 He to three-proton state by spin-isospin transition operators. The response functions are calculated with realistic nucleonnucleon potential models using a Faddeev three-body method. Calculated cross sections agree with available experimental data in substance. Possible effects arising from the uncertainty of proton-neutron amplitudes and three-nucleon interactions in three-proton system are examined.

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Testing the quark cluster model in nucleon-nucleon scattering

et al. 2002

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The description of the short-range part of the nucleon-nucleon forces in terms of quark degrees of freedom is tested against experimental observables. We consider, for this purpose, a model where the short-range part of the forces is given by the quark cluster model and the long-and medium-range forces by well established meson exchanges. The investigation is performed using different quark cluster models coming from different sets of quark-quark interactions. The predictions of this model are compared not only with the phase shifts but also directly with the experimental observables. Agreement with the existing pp and np world set of data is poor. This suggests that the current description of the nucleon-nucleon interaction, at short distances, in the framework of the nonrelativistic quark models, is at present only qualitative.

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Measurement of spin observables in neutron-proton elastic scattering

Cited by 9 publications

References 14 publications

Semilocal momentum-space regularized chiral two-nucleon potentials up to fifth order

Semilocal momentum-space regularized chiral two-nucleon potentials up to fifth order

Spin–isospin excitation of 3He with three-proton final state

Testing the quark cluster model in nucleon-nucleon scattering

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