Abstract
High-precision tensor analyzing power T20 data of the 1H (d,pp)n reaction at 130MeV beam energy have been determined for 81 kinematical configurations. They are compared to theoretical predictions based on various approaches to describe the dynamics of the three-nucleon (3N) system. The calculations are performed using modern realistic nucleon-nucleon potentials combined with three-nucleon force (3NF) models or with an effective 3NF resulting from the explicit treatment of the \( \Delta\) -isobar in coupled-channels (CC) calculations. Alternatively, the framework of chiral perturbation theory is used to generate consistent two-nucleon and three-nucleon potentials at the currently numerically attainable order. Results of the CC calculations with the \( \Delta\) degrees of freedom and including long-range Coulomb force are also shown. In general all predictions are consistent with each other and describe the experimental T20 results quite well. In a few configurations small inconsistencies between the data and the results of all approaches are observed. Predicted effects of the 3NF are not big and in most cases do not lead to an improved description of the data. The Coulomb force effects are also small in size and often opposite to the effects of TM99 3NF.
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Stephan, E., Kistryn, S., Biegun, A. et al. Precise set of tensor analyzing power T20 data for the deuteron-proton breakup at 130 MeV. Eur. Phys. J. A 42, 13 (2009). https://doi.org/10.1140/epja/i2009-10865-7
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DOI: https://doi.org/10.1140/epja/i2009-10865-7