Analyzing power in elastic scattering of6He from a polarized proton target at 71 MeV/nucleon

Abstract

The vector analyzing power has been measured for the elastic scattering of neutron-rich 6 He from polarized protons at 71 MeV/nucleon making use of a newly constructed solid polarized proton target operated in a low magnetic field and at high temperature. Two approaches based on local one-body potentials were applied to investigate the spin-orbit interaction between a proton and a 6 He nucleus. An optical model analysis revealed that the spin-orbit potential for 6 He is characterized by a shallow and long-ranged shape compared with the global systematics of stable nuclei. A semimicroscopic analysis with a α+n+n cluster folding model suggests that the interaction between a proton and the α core is essentially important in describing the p+ 6 He elastic scattering. The data are also compared with fully microscopic analyses using non-local optical potentials based on nucleon-nucleon g-matrices.

Spin observables in71AMeV6,8He-hydrogen scattering

“…1, while the dashed and dot-dashed lines show the results of the calculations made using WS functions with a larger binding energy (∼7 MeV) for the neutrons in the 0p shell (hereafter known as the "no halo" result) and also with oscillator functions (b = 1.7 fm), respectively. The data are from Sakaguchi et al [18] and Korshenninkov et al [13], portrayed by the circles and squares, respectively. In the case of the differential cross section, the data to 80 • are not sensitive enough to distinguish between the three results, although there may be a slight preference for the halo result at larger angles.…”

Spins in exotic nuclei: RI beam experiments with polarized targets

“…• in the center of mass system [54][55][56]. Figure 11 shows the data of the cross section and the vector analyzing power where filled circles, shaded squares, and open circles/squares are from Refs.…”

“…In this method, a microwave at the electron spin resonance frequency is irradiated to the target while an external magnetic field is varied simultaneously to cover the inhomogeneously The first experiments with the target system were to measure the vector analyzing power for the p- 6,8 He scattering at the RIPS facility, RIKEN [54][55][56]. In these experiments, the target was operated in a low magnetic field of about 0.1 T and at temperature of 100 K.…”

“…The triplet-DNP target was used to experimentally measure the vector analyzing power for the p- 6,8 He scattering at RIKEN [54][55][56]. As discussed in Section II A, the vector analyzing power in elastic scattering of non-zero spin particle is a direct manifestation of the spin-orbit coupling in nuclei.…”

“…Figure 11 shows the data of the cross section and the vector analyzing power where filled circles, shaded squares, and open circles/squares are from Refs. [56], [54,55], and [62,63], respectively. The solid and long-dashed curves in Fig.…”