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Observation of Tensor-Driven High-Momentum Neutrons in {}¹⁶O via (p,d) Reactions and Zero-Degree Deuteron Momentum Spectroscopy
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Observation of Tensor-Driven High-Momentum Neutrons in {}¹⁶O via (p,d) Reactions and Zero-Degree Deuteron Momentum Spectroscopy
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The $^{16}\mathrm{O}(p,d)^{15}\mathrm{O}$ reaction has been studied at $0^{\circ}$ using 403-, 604-, 907- and 1209-MeV protons, comparing cross sections populating positive- and negative-parity states in $^{15}\mathrm{O}$. Transitions to positive-parity states exhibit strong sensitivity 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 $2~\mathrm{fm}^{-1}$ for the $5/2^{+}$ to ground-state ratio. These results highlight $0^{\circ}$ neutron-pickup reactions as a sensitive probe for tensor-driven high-momentum components, paving the way for studies in exotic nuclei via radioactive beams.
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