Precise Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">dp</mml:mi></mml:math>Elastic Scattering at 270 MeV and Three-Nucleon Force Effects

Sakai, H.; Sekiguchi, K.; Witała, H.; Glöckle, W.; Hatano, M.; Kamada, H.; Kato, Hiroharu; Maeda, Y.; Nogga, A.; Ohnishi, T.; Okamura, H.; Sakamoto, N.; Sakoda, S.; Satou, Y.; Suda, K.; Tamii, A.; Uesaka, T.; Wakasa, T.; Yako, K.

doi:10.1103/physrevlett.84.5288

Cited by 152 publications

(130 citation statements)

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“…These two effects usually compete, and therefore * izabela.ciepal@uj.edu.pl the net effects of including the isobar in the potential are smaller than for approaches with the phenomenological 3NF's. When the chiral perturbation theory (ChPT) is used at the next-to-next-to-leading order (NNLO), the 3N contributions arise naturally, fully consistently with the NN force terms [4].The long-range electromagnetic component of the NN interaction was successfully implemented in CC formalism [5,6] as well as in the calculations [7] based on the AV18 NN potential combined with the Urbana IX 3NF.Besides the binding energies of the light nuclei, the importance of the 3NF was experimentally confirmed on the basis of the data originating from the nucleon-deuteron elastic scattering process [8][9][10][11][12][13][14][15][16][17]. In general, inclusion of the 3NF component improves the description of the cross-sectional data.…”

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confidence: 76%

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Vector analyzing powers of deuteron-proton elastic scattering and breakup at 130 MeV

et al. 2012

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Set of vector analyzing power data of the dp elastic scattering and 1 H ( d,pp)n breakup reactions at 130-MeV deuteron beam energy has been measured in the domain of very forward polar angles. The results are compared with theoretical predictions originating from various approaches: realistic nucleon-nucleon (NN) potentials and the NN potentials combined with a three-nucleon force (3NF) model and with predictions based on the ChPT framework. In case of the breakup process, none of the theoretical calculations reveal sensitivity to any of the dynamical effects such as 3NF or Coulomb interaction and they describe the experimental data equally well. For the elastic scattering, the Coulomb correction appears not negligible at very small θ c.m.d . The effect seems to be confirmed by the data. Few-nucleon systems are microscopic laboratories most suited for detailed study of the nucleon-nucleon (NN) interaction dynamics and the nuclear forces. Among them, the system composed of three nucleons (3N) is the simplest nontrivial environment where NN force models can be tested. Properties of 3N systems at medium energies are mainly determined by pairwise NN interaction. There are, however, reasons to assume the existence of additional dynamical effects like three-nucleon force (3NF) related to the presence of the third nucleon, or the Coulomb interaction, very significant in the domain of small polar angles of the emitted protons. Both effects are modeled within different theoretical formalisms.The realistic two-nucleon (2N) forces can be combined with the recent version of the 2π -exchange Tucson-Melbourne (TM) 3NF [1] or in the case of AV18 NN force with the Urbana IX 3NF [2]. Alternatively, 3NF can be generated by an explicit treatment of the isobar excitation within the coupled channel (CC) method [3]. For the 3N system, creation of a -containing state yields an effective 3NF but also two-barion dispersion. These two effects usually compete, and therefore * izabela.ciepal@uj.edu.pl the net effects of including the isobar in the potential are smaller than for approaches with the phenomenological 3NF's. When the chiral perturbation theory (ChPT) is used at the next-to-next-to-leading order (NNLO), the 3N contributions arise naturally, fully consistently with the NN force terms [4].The long-range electromagnetic component of the NN interaction was successfully implemented in CC formalism [5,6] as well as in the calculations [7] based on the AV18 NN potential combined with the Urbana IX 3NF.Besides the binding energies of the light nuclei, the importance of the 3NF was experimentally confirmed on the basis of the data originating from the nucleon-deuteron elastic scattering process [8][9][10][11][12][13][14][15][16][17]. In general, inclusion of the 3NF component improves the description of the cross-sectional data. However, quite significant discrepancies between the theoretical models and polarization observables are still present. Exploration of the nucleon-deuteron breakup can be considered as a natural next step in the...

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confidence: 76%

“…Besides the binding energies of the light nuclei, the importance of the 3NF was experimentally confirmed on the basis of the data originating from the nucleon-deuteron elastic scattering process [8][9][10][11][12][13][14][15][16][17]. In general, inclusion of the 3NF component improves the description of the cross-sectional data.…”

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confidence: 85%

Vector analyzing powers of deuteron-proton elastic scattering and breakup at 130 MeV

et al. 2012

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“…More recently it has also been suggested that minima and polarization observables of Nd elastic scattering at intermediate energies are sensitive to V ijk , and may be used to refine models of V ijk [59][60][61]. Thus further improvements in realistic models of V ijk may be possible by a simultaneous fit to Nd scattering observables and nuclear binding energies.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Realistic models of pion-exchange three-nucleon interactions

et al. 2001

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We present realistic models of pion-exchange three-nucleon interactions obtained by fitting the energies of all the 17 bound or narrow states of 3 ≤ A ≤ 8 nucleons, calculated with less than 2% error using the Green's function Monte Carlo method. The models contain two-pion-exchange terms due to πN scattering in S-and P-waves, three-pion-exchange terms due to ring diagrams with one ∆ in the intermediate states, and a phenomenological repulsive term to take into account relativistic effects, the suppression of the two-pion-exchange two-nucleon interaction by the third nucleon, and other effects. The models have five parameters, consisting of the strength of the four interactions and the short-range cutoff. The 17 fitted energies are insufficient to determine all of them uniquely. We consider five models, each having three adjustable parameters and assumed values for the other two. They reproduce the observed energies with an rms error < 1% when used together with the Argonne v 18 two-nucleon interaction. In one of the models the πN S-wave scattering interaction is set to zero; in all others it is assumed to have the strength suggested by chiral effective field theory. One of the models also assumes that the πN P-wave scattering interaction has the strength suggested by effective field theories, and the cutoff is adjusted to fit the data. In all other models the cutoff is taken to be the same as in the v 18 interaction. The effect of relativistic boost correction to the two-nucleon interaction on the strength of the repulsive three-nucleon interaction is estimated. Many calculated properties of A ≤ 8 nuclei, including radii, magnetic dipole and electric quadrupole moments, isobaric analog energy differences, etc., are tabulated. Results obtained with only Argonne v ′ 8 and v 18 interactions are also reported. In addition, we present results for 7-and 8-body neutron drops in external potential wells.

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“…The large discrepancy in the minimum of the elastic scattering cross section obtained with NN forces only seen for energies above ≈ 60 MeV is removed for energies below ≈ 140 MeV when 3NF's are included which reproduce the experimental triton binding energy [17,16] (see left panels of Figs.1 and 2). A similar behavior shows up for the high energy deuteron vector analyzing power A y (d) [16,18,19,20]. But there are many spin observables for which large 3NF effects are predicted and where the TM and the Urbana IX do not reproduce the data [16].…”

Section: Reactions In the 3n Continuummentioning

confidence: 77%

Chiral 3NF and neutron-deuteron scattering

Witała¹

2010

Proceedings of 6th International Workshop on Chiral Dynamics — PoS(CD09)

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Results on three-nucleon (3N) elastic scattering below the pion production threshold are discussed with emphasis on the need for a three-nucleon force (3NF). The large discrepancies found between a theory based on numerical solutions of 3N Faddeev equations with (semi)phenomenological NN potentials only and data point to the need for 3NF's. This is further supported since another possible reason for the discrepancies in elastic nucleon-deuteron ( Nd) scattering, relativistic effects, turned out to be small. Results for chiral NN (at N 2 LO and N 3 LO) and 3NF's (at N 2 LO) are shown and discussed.

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Precise Measurement ofdpElastic Scattering at 270 MeV and Three-Nucleon Force Effects

Cited by 152 publications

References 32 publications

Vector analyzing powers of deuteron-proton elastic scattering and breakup at 130 MeV

Vector analyzing powers of deuteron-proton elastic scattering and breakup at 130 MeV

Realistic models of pion-exchange three-nucleon interactions

Chiral 3NF and neutron-deuteron scattering

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