Evidence of tensor interactions in ¹⁶O observed via (p,d) reaction

¹ Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
² School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China
³ General Education, Faculty of Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan
⁴ Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
⁵ RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
⁶ Department of Physics, Kyoto University, Kitashirakawa, Kyoto 606-8502, Japan
⁷ Institute of Physics, Tsukuba University, Tsukuba Ibaraki 305-8571, Japan
⁸ Department of Physics, Nara Women’s University, Nara 630-8506, Japan

^a e-mail: onghjin@rcnp.osaka-u.ac.jp

Published online: 20 March 2014

Abstract

We measured the differential cross sections of the ¹⁶O(p,d) reaction populating the ground state and several low-lying excited states in ¹⁵O using 198-, 295- and 392-MeV proton beams at the Research Center for Nuclear Physics (RCNP), Osaka University, to study the effect of the tensor interactions in ¹⁶O. Dividing the cross sections for each excited state by the one for the ground state and comparing the ratios over a wide range of momentum transfer, we found a marked enhancement of the ratio for the positive-parity state(s). The observation is consistent with large components of high-momentum neutrons in the ground-state configurations of ¹⁶O due possibly to the tensor interactions.