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The effects of the three-body force are investigated in the three-nucleon systems. The threebody Faddeev equation is completely solved with a phenomenological three-body force which can reproduce the triton binding energy. The adopted two-body force is the PEST potential (or the Ernst-Shakin-Thaler's separable expansion of the Paris potential) up to J = 2. Calculated results of the differential cross section, and the values of the doublet and the quartet n-d scattering lengths, agree very well with the experimental data. The calculated three-body-force effects on the N-d scattering observables A", iTqq, T20, TqI, Tqq are also discussed together with the Doleschall-type Coulomb correction.PACS number(s): 21.30. +y, 21.45.+v, 25.10.+sThe necessity of the three-body force has been claimed by a number of investigations. Phillips observed a strong correlation among the theoretically calculated n-d spindoublet scattering length sa"d and the triton binding energy [1]. Slaus et aL claimed that the three-body force is necessary to obtain consistent values of the a""scattering length from the reactions 2H(n, p)nn and H(p, s )nn [2,3]. It was also mentioned that the discrepancy between the experimental and the theoretical triton binding energies and other observables which are related to the triton wave function can be removed by the three-
The effects of the three-body force are investigated in the three-nucleon systems. The threebody Faddeev equation is completely solved with a phenomenological three-body force which can reproduce the triton binding energy. The adopted two-body force is the PEST potential (or the Ernst-Shakin-Thaler's separable expansion of the Paris potential) up to J = 2. Calculated results of the differential cross section, and the values of the doublet and the quartet n-d scattering lengths, agree very well with the experimental data. The calculated three-body-force effects on the N-d scattering observables A", iTqq, T20, TqI, Tqq are also discussed together with the Doleschall-type Coulomb correction.PACS number(s): 21.30. +y, 21.45.+v, 25.10.+sThe necessity of the three-body force has been claimed by a number of investigations. Phillips observed a strong correlation among the theoretically calculated n-d spindoublet scattering length sa"d and the triton binding energy [1]. Slaus et aL claimed that the three-body force is necessary to obtain consistent values of the a""scattering length from the reactions 2H(n, p)nn and H(p, s )nn [2,3]. It was also mentioned that the discrepancy between the experimental and the theoretical triton binding energies and other observables which are related to the triton wave function can be removed by the three-
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