Speaker
Description
One of the main interest of nuclear physics is to understand nuclear properties based on bare nuclear forces. Recently, it is indicated that the three-nucleon forces (3NFs) is essential to clarify various nuclear phenomena. Few-nucleon scattering at intermediate energies (∼ 100 MeV/nucleon) is one of good approach to investigate dynamical aspects of 3NFs. In the last decade study of nucleon-deuteron (three-nucleon system) as well as deuteron breakup channels has been extensively performed both experimentally and theoretically. Direct comparison between the data and the rigorous numerical calculations in terms of Faddeev theory showed clear evidence of 3NFs effects [1].
In order to explore the properties of the 3NFs in four-nucleon systems, we are planning measurements of p−3He elastic scattering at intermediate energies. As a first experiment, we performed the measurement of 3He analyzing power at 70 MeV/nucleon with polarized 3He target at the Cyclotron and Radioisotope Center (CYRIC), Tohoku University. Proton beams were injected to polarized 3He target, and scattered protons were detected by using E − ∆E detectors which consisted of plastic and NaI(Tl) scintillators. Measured angles were from 50◦ to 110◦ in the laboratory system. Polarized 3He was produced by the spin-exchange optical pumping (SEOP) method, and typical values of 3He polarizations were 10 ％. In the conference we will report a recent result of this experiment.
References
[1] See, e.g., K. Sekiguchi et al., Phys. Rev. C 65, 034003 (2002); ibid. 89, 064007 (2014).
