He elastic scattering with a 65 MeV polarised proton beam

 One of the most important topics of the nuclear physics is to understand various nuclear phenomena based on the nucleon-nucleon interactions combined with three-nucleon forces (3NFs). It should be interesting to see how 3NFs act in p–³He scattering. In this system, one could study 3NFs effects in 4-nucleon scattering, and also approach to 3NFs with the iso-spin channels of T=3/2.

 In order to study 3NFs effects in p–³He elastic scattering, we performed the measurement of the cross section and the proton analyzing power at 65 MeV with a polarized proton beam at Research Center for Nuclear Physics (RCNP), Osaka University. The gaseous ³He target was bombarded by a polarized proton beam, and scattered protons were detected by using the E − ∆E detectors which consisted of plastic and NaI(Tl) scintillators. Measured angles were 20^◦ −165^◦ in the laboratory system (26.9^◦ −170.1^◦ in the center of mass system). The typical beam polarizations were 50 % throughout the experiment. We also measured the cross section for pp elastic scattering with the same experimental setup in order to estimate the overall systematic uncertainties.

 In the conference, we will report on the obtained data combined with the theoretical calculations.