Measurements ofn−p correlations in the reaction of relativistic neon with uranium |
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Authors: | K Frankel W Schimmerling J O Rasmussen K M Crowe J Bistirlich H Bowman O Hashimoto D L Murphy J Ridout J P Sullivan E Yoo W J McDonald M Salomon J -S Xu |
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Institution: | 1. Lawrence Berkeley Laboratory, University of California, Berkeley, California, USA 3. University of Alberta, Edmonton, Canada 4. University of British Columbia, Vancouver, Canada 5. Fudan University, Shanghai, Peoples Republic of China
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Abstract: | We report a preliminary measurement of coincident neutron-proton pairs emitted at 45° in the interaction of 400, 530, and 650 MeV/A neon beams incident on uranium. Charged particles were identified by time of flight and momentum, as determined in a magnetic spectrometer. Neutral particles were detected using a thick plastic scintillator, and their time of flight was measured between an entrance scintillator, triggered by a charged particle, and the neutron detector. The scatter plots and contour plots of neutron momentum vs. proton momentum appear to show a slight correlation ridge above an uncorrelated background. The projections of this plane on then-p momentum difference axis are essentially flat, showing a one standard deviation enhancement for each of the three beams energies. At each beam energy, the calculated momentum correlation function for the neutron-proton pairs is enhanced near zero neutron-proton momentum difference by approximately one standard deviation over the expected value for no correlation. This enhancement is expected to occur as a consequence of the attractive final state interaction between the neutron and proton (i.e., virtual or “singlet” deuterons). The implications of these measurements are discussed. |
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