A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron (Cxjavax.xml.bind.JAXBElement@c35188dn) in deuterium photodisintegration has been carried out. This quantity is determined over the photon energy range 370 – 700 MeV and for neutron centre-of-mass breakup angles ∼45−120∘. The polarisation of the final state neutrons was determined by an ancillary large-acceptance nucleon polarimeter, surrounding a cryogenic liquid deuterium target within the Crystal Ball detector at MAMI. The polarimeter characterised (n,p) charge exchange of the ejected neutrons to determine their polarisation. The new Cxjavax.xml.bind.JAXBElement@3e028df3n data are also compared to a theoretical model based on nucleonic and nucleon resonance degrees of freedom constrained by the current world-database of deuterium photodisintegration measurements. Structures in Cxjavax.xml.bind.JAXBElement@55f983f0n observed in the region of the d⁎(2380) could not be explained by conventional models of deuteron photodisintegration.
First measurement of polarisation transfer Cxjavax.xml.bind.JAXBElement@51f74940n in deuteron photodisintegration
Costanza S.;Pedroni P.;
2023-01-01
Abstract
A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron (Cxjavax.xml.bind.JAXBElement@c35188dn) in deuterium photodisintegration has been carried out. This quantity is determined over the photon energy range 370 – 700 MeV and for neutron centre-of-mass breakup angles ∼45−120∘. The polarisation of the final state neutrons was determined by an ancillary large-acceptance nucleon polarimeter, surrounding a cryogenic liquid deuterium target within the Crystal Ball detector at MAMI. The polarimeter characterised (n,p) charge exchange of the ejected neutrons to determine their polarisation. The new Cxjavax.xml.bind.JAXBElement@3e028df3n data are also compared to a theoretical model based on nucleonic and nucleon resonance degrees of freedom constrained by the current world-database of deuterium photodisintegration measurements. Structures in Cxjavax.xml.bind.JAXBElement@55f983f0n observed in the region of the d⁎(2380) could not be explained by conventional models of deuteron photodisintegration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
