Polarization transfer measurement for 1H(d⃗,p⃗)2H elastic scattering at 135 MeV∕nucleon and three-nucleon force effects
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概要
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The deuteron-to-proton polarization-transfer coefficients for d-p elastic scattering were precisely measured with an incoming deuteron energy of 135 MeV∕nucleon at the RIKEN Accelerator Research Facility. The data are compared to theoretical predictions based on exact solutions of the three-nucleon Faddeev equations with high-precision nucleon-nucleon forces combined with the current, most popular three-nucleon force (3NF) models: the 2π -exchange Tucson-Melbourne model, a modification thereof based on chiral symmetry, TM′(99) , and the Urbana IX 3NF. Theory predicts large 3NF effects, especially in the angular range around the cross section minimum, predominantly for Kxxy′−Kyyy′ (Kxxy′,Kyyy′) , but the present data only partially concurs with the calculations. For the induced polarization, Py′ , the TM′(99) and Urbana IX 3NFs reproduce the data, but the Tucson-Melbourne 3NF fails to describe the data. For the polarization-transfer coefficients, Kyy′ and Kxzy′ , the predicted 3NF effects are in drastic disagreement with the data. These facts clearly reveal the defects of the 3NF models currently used.
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