Abstract
After 2π3NF was found in 1998, many experiments were made on Nd elastic scattering, Nd breakup and pd capture, and many discrepancies between experiments and calculations were revealed. Systematic experimental data are still being accumulated. From the systematic data, 3NF other than 2π3NF such as πρ3NF and ρρ3NF , and origins of low-energy anomalies are expected to be found in the future.
Highlights
One of the purposes to study three-nucleon (3N) systems is to find effects of three-nucleon forces (3NF) and to determine their strengths
Koike found by chance the same discrepancy at the cross section minimum at 135 MeV, and he introduced the discrepancy as Sagara discrepancy in FB15 in 1997[3]
Experimental results for D(p,p1)p2n cross section at 247 MeV are shown in Figure 2 with calculations by Witała
Summary
One of the purposes to study three-nucleon (3N) systems is to find effects of three-nucleon forces (3NF) and to determine their strengths. In 1998, Witała et al, excellently solved the binding energy problem and Sagara discrepancy by introducing the same 2π3NF[4]. The experimental studies have been widely made at higher energy region on Nd elastic scattering, and made on pd breakup and pd capture. All the experimental observables at higher energy disagree more or less with calculations even after 2π3NF being included. We have already solved discrepancies in 3N binding energy and in pd scattering cross section minimum by 2π3NF. Some of the disagreements may indicate effects of 3NF other than 2π3NF
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