Abstract
Roles of spin-dependent interactions in unstable nuclei have been investigated via the direct reaction of radioactive ions with a solid spin-polarized proton target. The target has a unique advantage of a high polarization of 20–30% under low magnetic field of 0.1 T and at a high temperature of 100 K, which allow us to detect recoil protons with good angular resolution. Present status of on-going experimental studies at intermediate energies, such as proton elastic scattering and ([Formula: see text]) knockout reaction, and new physics opportunities expected with low-energy RI beams are overviewed.
Highlights
The world of atomic nuclei is enriched by the strong spin-dependent interaction in the nuclear force
At RIKEN and CNS University of Tokyo, we have constructed a solid spin-polarized proton target that is applicable to RI-beam experiments,[5] which allows measurement of polarization observable in the direct reaction involving unstable nuclei
The polarized target for RI-beam experiments has to be operated under a low magnetic field of about 0.1 T so that low-energy recoil particles can be detected with good angular resolutions under the inverse-kinematics condition
Summary
The world of atomic nuclei is enriched by the strong spin-dependent interaction in the nuclear force. Spin-orbit, tensor and three-body forces play essentially important roles in nuclear structure and reaction For studying such interactions, one of the powerful approaches is the direct reaction of spin-polarized light nuclei. Study of nuclei far from the stability line has been extensively carried out for these This is an Open Access article published by World Scientific Publishing Company. The spin-dependent interactions attracts renewed interest as they are pointed out to be key elements underlying these phenomena.[1,2,3,4] At RIKEN and CNS University of Tokyo, we have constructed a solid spin-polarized proton target that is applicable to RI-beam experiments,[5] which allows measurement of polarization observable in the direct reaction involving unstable nuclei. New physics opportunities expected in low-energy RI-beam experiments is covered
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