Tensor and vector analyzing powers of the 1H(,pp)n reaction

Qin, L. M.; Boeglin, W.; Fritschi, D.; Götz, J.; Jourdan, J.; Masson, G.; Robinson, Simon P.; Sick, I.; Trueb, P.; Tuccillo, M.; Zihlmann, B.; Witała, H.; Golak, J.; Glöckle, W.; Hüber, D.

doi:10.1016/0375-9474(95)00010-x

Cited by 14 publications

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“…The present work with tensor-polarized deuterons was motivated mainly by discrepancies between theoretical predictions and data found in the observable A yy at incoming deuteron energies 94.5 [21] and 52.1 MeV [22]. Besides, breakup tensor analyzing powers have been measured only rarely and showing the area of the (true+random) events C(tr+r) marked in white as well as the area of the randomly distributed events C(r) marked in black.…”

Section: Introductionmentioning

confidence: 99%

Cross sections and tensor analyzing powersAyyof the reactionH1(
Ley
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Düweke
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Emmerich
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et al. 2006
Phys. Rev. C
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We measured the cross sections and tensor analyzing powers of the 1 H( d,pp)n breakup reaction at E d = 19 MeV in four symmetric constant relative energy (SCRE) configurations. The data are compared with theoretical predictions from four different approaches: the first based on high-precision (semi)phenomenological potentials alone or, the second, combined with model three-nucleon forces, and the third based on chiral forces up to next-to-next-to-leading order (NNLO) in the chiral expansion. In these cases the Coulomb interaction is not included. In addition, a fourth approach consists in a comparison with predictions based on CD Bonn including the excitation and the Coulomb force. In all cases the measured cross sections are significantly below the theoretical values, whereas the magnitudes of the tensor analyzing powers agree within the error bars in three of the four cases. The apparent discrepancies in the breakup cross sections are similar to the known differences for the space-star breakup. This adds to the data base of unsolved low-energy discrepancies (puzzles). of the nucleon-deuteron (Nd) vector analyzing power A y at energies below ≈25 MeV by all modern NN potentials [1]. In both the proton-deuteron (pd) and neutron-deuteron (nd) elastic scattering, the theoretical prediction is about 30% below the data in the angular region of the analyzing power maximum [2][3][4]. For the same reaction, but for energies above ≈60 MeV, the minima of the differential cross section are also underpredicted if only two-nucleon (2N ) forces are used [5,6]. Although this discrepancy can be removed once three-nucleon forces (3NF s) are also taken into account, the low-energy A y problem has not been resolved yet.For the breakup process the low-energy nd space-star (SST) configuration in which all three nucleons are emerging in the c.m. system with equal magnitudes of momenta in a plane perpendicular to the incoming beam direction still presents 0556-2813/2006/73(6)/064001 (12) 064001-1

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Section: Introductionmentioning

confidence: 99%