原子核におけるテンソル力駆動の核子間短距離相関を解明（Researchers Uncover Tensor-Force-Driven Nucleon-Nucleon Short-Range Correlations in Atomic Nuclei）

2026-06-16 中国科学院（CAS）

Left: Schematic illustration of the neutron pickup reaction. A fast proton “removes” a neutron with matched momentum from an oxygen-16 nucleus, forming a deuteron that flies out. Right: Ratio of cross sections for positive-parity to negative-parity states as a function of momentum transfer. Red dots: present experimental data; white dots: literature values; curves: theoretical prediction. The peak appears at approximately 2 fm^-1, confirming the high-momentum components driven by the tensor force. (Image from IMP)

＜関連情報＞

• https://english.cas.cn/newsroom/research-news/202606/t20260617_1170117.shtml
• https://www.sciencedirect.com/science/article/pii/S0370269326004168

( p,d )反応およびゼロ度重水素運動量分光法による16O中のテンソル駆動高運動量中性子の観測 Observation of tensor-driven high-momentum neutrons in 16O via (p, d) reactions and zero-degree deuteron momentum spectroscopy

X. Wang, H.J. Ong, S. Terashima, I. Tanihata, Y.K. Tanaka, H. Geissel, N. Aoi, Y. Ayyad, J. Benlliure, F. Farinon, H. Fujioka, J. Gellanki, C.L. Guo, E. Haettner, W.L. Hai, M.N. Harakeh, C. Hornung, K. Itahashi, R. Janik, N. Kalantar-Nayestanaki…J.W. Zhao
Physics Letters B  Available online 22 May 2026
DOI:https://doi.org/10.1016/j.physletb.2026.140563

Highlights

• Tensor interactions are a key component of the nucleon–nucleon interactions.
• They create strong proton–neutron correlations and high-momentum components.
• Tensor interactions affect shell evolution and magic numbers far from stability.
• Knockout reactions probe high-momentum nucleons but are difficult for rare isotopes.
• Zero-degree neutron pickup sensitively probes tensor-driven high momentum nucleons.

Abstract

The ¹⁶O(p, d)¹⁵O reaction has been studied at 0^∘ using 403-, 604-, 907- and 1209-MeV protons, comparing cross sections populating positive- and negative-parity states in ¹⁵O. Transitions to positive-parity states exhibit strong enhancement due to high-momentum neutrons, while negative-parity transitions show much smaller effects. The cross-section ratio between positive- and negative-parity states rises sharply with momentum transfer, matching theoretical predictions that include tensor interactions, particularly the peak near 2 fm^-1. These results highlight 0^∘ neutron-pickup reactions as a sensitive probe for tensor-driven high-momentum components, paving the way for studies in exotic nuclei via radioactive beams.