Spin correlation coefficient for proton- He 3 elastic scattering at 100 MeV

A. Watanabe, S. Nakai, K. Sekiguchi, A. Deltuva, S. Goto, K. Hatanaka, Y. Hirai, T. Ino, D. Inomoto, M. Inoue, S. Ishikawa, M. Itoh, H. Kanda, H. Kasahara, Y. Maeda, K. Miki, K. Nonaka, H. J. Ong, H. Oshiro, D. SakaiH. Sakai, S. Shibuya, D. T. Tran, H. Umetsu, Y. Utsuki, T. Wakasa

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2 Citations (Scopus)


We present the measured spin correlation coefficient Cy,y for p-He3 elastic scattering at 100 MeV at the angles θc.m.=46.9∘-149.2∘ in the center-of-mass system. The Cy,y data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The Δ-isobar effects estimated by the NN+NΔ coupled-channels approach are small for the cross section. Meanwhile, in Cy,y, the Δ-isobar effects improve the agreement with the data. The analysis of the p-He3 elastic scattering amplitudes implies the necessity of three-nucleon forces (3NFs) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient Cy,y expands the knowledge of the nuclear interactions with the Δ isobar or those including 3NFs that are masked in nucleon-deuteron elastic scattering.

Original languageEnglish
Article number054002
JournalPhysical Review C
Issue number5
Publication statusPublished - Nov 2022

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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