Abstract
Space Star (SS) anomaly in Nd breakup cross section is well known. SS anomaly has large charge asymmetry; experiment is larger than calculation at nd SS and experiment is smaller than calculation at pd SS. There are also reports on anomaly in quasi-free scattering (QFS) cross section in Nd breakup reaction. At nd QFS, experimental cross section was found to be larger than calculation. On the contrary, pd QFS cross section measured by Koln group is smaller than pd calculation. We measured QFS cross section in pd breakup reaction, and compared the data with recent pd calculations to see angular dependence of QFS anomaly.
Highlights
After the strength of two-pion exchange three-nucleon force (2π3NF) was determined in 1998, there remain two kinds of big problems in three nucleon systems; one is to find remaining 3NF other than 2π3NF, and the other is to solve long-standing problems at low energy, Ay puzzle and star anomaly, which seem to be irrelevant to 3NF because 3NF effects are very small in general in low energy reactions.Studies of new 3NF are being made at higher energy regions and some are presented in this conference
We have started a systematic measurement of pd quasi-free scattering (QFS) cross section at Ep = 9.5 MeV and 13 MeV, to see angular dependence of QFS anomaly
The experimental data were compared with pd calculations with and without Δ effects (3NF) by Deltuva et al.. 3NF effects slightly increase the cross section around QFS
Summary
After the strength of two-pion exchange three-nucleon force (2π3NF) was determined in 1998, there remain two kinds of big problems in three nucleon systems; one is to find remaining 3NF other than 2π3NF, and the other is to solve long-standing problems at low energy, Ay puzzle and star anomaly, which seem to be irrelevant to 3NF because 3NF effects are very small in general in low energy reactions. QFS anomaly in nd breakup reaction has been reported at En = 26 MeV by Bonn group [11] and at 25 MeV by Beijing group [12]. In an N d breakup experiment with a deuteron target, 1 + (2 + 3) → 1 + 2 + 3, QFS appears at E3 = 0. We have started a systematic measurement of pd QFS cross section at Ep = 9.5 MeV and 13 MeV, to see angular dependence of QFS anomaly
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