Abstract
We measured the differential cross sections of the 16 O(p,d) reaction populating the ground state and several low-lying excited states in 15 O 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 16 O. 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 16 O due possibly to the tensor interactions.
Highlights
Tensor interactions play important roles in atomic nuclei
Earlier theoretical [3] studies had pointed out the importance of the tensor interactions to the binding of 3H and 3,4He; these predictions were later confirmed by experiments [4] which showed the existence of D-wave components
Proton beams at Ep = 198, 295 and 392 MeV were provided by the Research Center for Nuclear Physics (RCNP) ring cyclotron, and bombarded a selfsupporting windowless thin ice target [9] placed in a scattering chamber
Summary
Tensor interactions play important roles in atomic nuclei. The tensor interactions are essential to explain the observed quadrupole moment [1] as well as the binding [2] of the deuteron. For nuclei heavier than 4He, no direct experimental evidence of the tensor interactions has been reported far, ab-initio calculations [5] have predicted essential importance of the tensor interactions for binding nuclei up to mass number A = 12. 5+ 2 states that could be made by the cross section to the positive-parity excited D-wave mixing, at high momentum transfer
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