Abstract
Vector-analyzing powers, \(A_x\) and \(A_y\), of the proton–deuteron break-up reaction have been measured by using a polarized-proton beam at 135 MeV impinging on a liquid-deuterium target. For the experiment, the big instrument for nuclear-polarization analysis (BINA) was used at KVI, Groningen, the Netherlands. The data are compared to the predictions of Faddeev calculations using state-of-the-art two- and three-nucleon potentials. Our data are reasonably well described by calculations for the kinematical configurations at which the three-nucleon force (3NF) effect is predicted to be small. However, striking discrepancies are observed at specific configurations, in particular in the cases of symmetric configurations, where the relative azimuthal angle between the two protons is small which corresponds to the \(d(\mathop {p}\limits ^{\rightarrow },\mathrm{{^{2}He}})n\) channel. The vector-analyzing powers of these configurations are compared to the proton–deuteron elastic scattering to study the spin–isospin sensitivity of the 3NF models. The results are compared to the earlier results of the proton–deuteron break-up reaction at 190 MeV proton-beam energy [1]. Disagreement is observed for both proton-beam energies between data and calculations which points to a deficiency in the treatment of spin–isospin part of the 3NF.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The original data, which are of very large volume, are available on storage disks and can be provided upon request by any one familiar with digital data analysis.]
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Acknowledgements
This work was partly supported by the Polish National Science Centre under Grant No. 2012/05/B/ST2/02556 and 2016/22/M/ST2/00173. The numerical calculations of were partially performed on the supercomputer cluster of the JSC, Jülich, Germany.
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Communicated by A.F. Di Pietro
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Tavakoli-Zaniani, H., Eslami-Kalantari, M., Amir-Ahmadi, H.R. et al. Vector-analyzing powers in the \(d(\mathop {p}\limits ^{\rightarrow },pp)n\) and \(d(\mathop {p}\limits ^{\rightarrow },\mathrm{{^{2}He}})n\) channels at 135 MeV. Eur. Phys. J. A 56, 62 (2020). https://doi.org/10.1140/epja/s10050-020-00065-4
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DOI: https://doi.org/10.1140/epja/s10050-020-00065-4