Abstract
We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around E_{γ}∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d^{*}(2380) hexaquark.
Highlights
[32] Note that for the nucleon energies analyzed in this experiment the potential contribution of inelastic processes in which an additional pion is produced in the final state are negligible. [33] S.Agostinelli et al, Phys
We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI
The new data reveal a striking consistency between Pny and the previous Ppy [13] measurements in the region of the dÃð2380Þ
Summary
[32] Note that for the nucleon energies analyzed in this experiment the potential contribution of inelastic processes in which an additional pion is produced in the final state are negligible. [33] S.Agostinelli et al, Phys. We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI.
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