Signatures of the d
Phys Rev Lett
; 124(13): 132001, 2020 Apr 03.
Article
em En
| MEDLINE
| ID: mdl-32302204
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 300-700 MeV 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}â¼570 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.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2020
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Article