Investigation of the nucleon-nucleon tensor force in the three-nucleon system

Clajus, M.; Egun, P.M.; Grüebler, W.; Hautle, P.; Šlaus, I.; Vuaridel, B.; Sperisen, F.; Kretschmer, W.; Rauscher, A.; Schuster, W. J.; Weidmann, R.; Haller, M.; Bruno, Michael; Cannata, F.; D'Agostino, M.; Witała, H.; Cornelius, T.; Glöckle, W.; Schmelzbach, P.A.

doi:10.1016/0370-2693(90)90654-o

Cited by 27 publications

(13 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reference [10] found good agreement between the polarization transfer coefficient K in elastic p-d scattering at 22.7 MeV and a continuum three-nucleon calculation based on the Bonn A potential.…”

Section: Renormalizationmentioning

confidence: 89%

“…Since the calculation of Ref. [10] neglects both these effects, we believe that a comparison with regard to c, , between our analysis and that of Ref. [10] is only meaningful after a detailed study of possible Coulomb and three-body force and/or off-shell contributions.…”

Section: Renormalizationmentioning

confidence: 93%

“…5), which is characterized by a weak tensor force. This relativistic moinentum-space potential is able to accornrnodate both the binding energy of the triton [3] and the polarization transfer coefficient K» in elastic p-d scattering [10] without need for three-body forces. The observed disagreement with calculations based on the full Bonn or Paris potential was blamed on the stronger tensor force of the latter models (for the triton binding, see the discussion in the Introduction).…”

Section: Renormalizationmentioning

confidence: 99%

“…However, most of these observables also display a strong dependence on the tensor force [9,10], so that precise and independent information on the latter is absolutely necessary. Vice versa, the determination of the NN tensor force from 3N continuum observableswhich in principle would be very effective because of the strong sensitivitiesis hampered by our poor knowledge on three-body force and/or off-shell effects.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

Henneck

1993

Phys. Rev. C

View full text Add to dashboard Cite

A new phase-shift analysis of NN scattering in the energy range 15 -160 MeV is presented. The analysis is based on the carefully reviewed world pp +np data, including recent results for higher-order spin observables in n-p scattering. The latter are essential to determine the mixing parameter~& which is directly related to the isoscalar tensor force. c, displays a high trend, in agreement with recent analyses above 140 MeV, and is only reproduced by potential models with a strong tensor force. The prediction of the full Bonn potential is too low by 20% for energies above 40 MeV. All other I=O phase shifts show agreement with potential models; in particular, the notorious problem with 'P, around 50 MeV has disappeared. Around 25 MeV a ten parameter fit based purely on np data agrees with the corresponding At to the pp data and reveals no indication of anomalous charge independence breaking.PACS number(s): 21.30. +y, 13.75.Cs, 21.45. +v, 25. 10.+s

show abstract

Section: Renormalizationmentioning

confidence: 89%

Section: Renormalizationmentioning

confidence: 93%

Section: Renormalizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

Henneck

1993

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…21 can only be clarified by a detailed study of the uncertainties entering into the three-nucleon calculation of Ref. 21 concerning the neglect of Coulomb forces and of possible three-body-force-off-shell effects.…”

mentioning

confidence: 99%

Neutron-proton spin-correlation parameterAzzat 68 MeV

et al. 1991

View full text Add to dashboard Cite

We report a first measurement of the spin-correlation parameter A zz in neutron-proton scattering at 67.5 MeV. The results, obtained in the angular range 105° < 0 cm . ^ 170° with typical accuracies of 0.008, are highly sensitive to the l S\-l D\ mixing parameter e\. A phase-shift analysis based on the current world data yields a value of e\ significantly higher than predicted by modern potential models.PACS numbers: 21.30.+y, 13.75.Cs, 13.88.+e, 25.10.+S One of the long-standing problems in our understanding of the fundamental nucleon-nucleon interaction is the poor knowledge of the isoscalar tensor force. This force mixes states with different angular momenta L= S J±\ (with J the total angular momentum). It is directly related to the 3 S\-3 D\ mixing parameter €\ in neutronproton scattering and the Z)-state admixtures of light nuclei.Since the binding energies of few-nucleon systems are highly sensitive to the isoscalar tensor force, the poor knowledge of €\ has important implications concerning the accuracy of binding-energy calculations, and the question of whether nuclear binding energies can quantitatively be understood in terms of two-nucleon forces. Exact calculations of the triton binding energy show that without three-body forces the measured binding energy can only be reproduced for a weak tensor force. 1 The binding energy of nuclear matter as well depends strongly on the isoscalar tensor interaction. x For the study of non-nucleonic degrees of freedom of nuclei a precise knowledge of S-D transitions is also a prerequisite. The contribution of mesonic degrees of freedom to electromagnetic form factors of the A = 2,3 systems-the observables most sensitive to these degrees of freedom-is of nearly equal size, but of opposite sign as the effects of the S-D transition. A determination of the former requires reliable information on the latter.The problem 2,3 with e\ is a twofold one: (a) only higher-order spin observables such as spin-correlation or spin-transfer parameters in n-p scattering are sensitive to €\\ these quantities are difficult to measure; (b) these observables in most cases are also sensitive to the other poorly determined quantity, the l P\ phase. As a result, the values of e\ and ] P\ which have been extracted from phenomenological phase-shift analyses (PSA) exhibit large uncertainties. A more accurate determination of e\ in the energy region relevant for nucleons in nuclei ik}l 2m -35 MeV) thus would be of high interest.Condition (a) requires precise experiments in which the spins of at least two of the reaction partners are measured. Recently, measurements have been performed for the spin-correlation coefficient A yy between 18 and 50 MeV. 4 The present Letter reports the first measurement below 400 MeV of the spin-correlation parameter A zz (0), the observable most sensitive to €\. 2 Condition (b) calls for the measurement of complementary quantities to pin down other phases, especially X P\. In order to reduce the amount of ambiguity in a PSA we have measured the differential cros...

show abstract

Recent Developments in Low-Energy Nucleon-Nucleon Interaction Studies

Tornow

1991

Spin and Isospin in Nuclear Interactions

View full text Add to dashboard Cite

Investigation of the nucleon-nucleon tensor force in the three-nucleon system

Cited by 27 publications

References 21 publications

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

Phase-shift analysis ofNNscattering below 160 MeV: Indication for a strong tensor force

Neutron-proton spin-correlation parameterAzzat 68 MeV

Recent Developments in Low-Energy Nucleon-Nucleon Interaction Studies

Contact Info

Product

Resources

About