Induced Polarization in the ${}^2$H($\gamma ,\vec{n}$)${}^1$H Reaction at Low Energy

Abstract

The induced polarization, $P_y^{\prime }$, of the neutron in the deuteron photo-disintegration from threshold up to 30 MeV is calculated using a variety of different, latest-generation potentials--Argonne $v_{18}$, Bonn 2000, and Nijmegen I-- and a realistic model for the nuclear electromagnetic current operator, including one- and two-body terms. The model dependence of the theoretical predictions is found to be very small. These predictions are systematically larger in magnitude than the measured $P_y^{\prime }$ values, and corroborate the conclusions of an earlier, and much older, study. There is considerable scatter in the available experimental data. New and more accurate measurements of the induced polarization in the ${}^2$H($\gamma ,\vec{n}$)${}^1$H reaction are needed in order to establish unequivocally whether there is a discrepancy between theory and experiment.

arXiv comment4, 8 figures

References in corpus (8)

• An accurate nucleon-nucleon potential with charge-independence breaking
• The high-precision, charge-dependent Bonn nucleon-nucleon potential (CD-Bonn)
• Construction of high-quality Nucleon-Nucleon potential models
• Evolution of Nuclear Spectra with Nuclear Forces
• Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator
• Six-body calculation of the alpha-deuteron radiative capture cross section
• Parity-Violating Interaction Effects in the np System
• Photo- and Electro-Disintegration of 3He at Threshold and pd Radiative Capture

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