First measurement of polarisation transfer Cxn in deuteron photodisintegration

Bashkanov, M.; Watts, D.P.; Kay, S.; Abt, S.; Achenbach, P.; Adlarson, P.; Afzal, F.; Ahmed, Z.; Akondi, C.S.; Annand, J.R.M.; Arends, H.J.; Beck, R.; Biroth, M.; Borisov, N.; ..., ...; Supek, Ivan; ..., ...; Wettig, J.; Wolfes, M.; Zachariou, N. (2023) First measurement of polarisation transfer Cxn in deuteron photodisintegration. Physics Letters B, 844 . ISSN 03702693

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Abstract

A first measurement of the polarisation transfer from a circularly-polarised photon to the final state neutron () 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 . 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 charge exchange of the ejected neutrons to determine their polarisation. The new 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 observed in the region of the ⁎ could not be explained by conventional models of deuteron photodisintegration.

Item Type:	Article
Uncontrolled Keywords:	circularly-polarised photon; deuterium photodisintegration; Crystal Ball detector at MAMI
Subjects:	NATURAL SCIENCES NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Virna Brumnić
Date Deposited:	05 May 2025 09:02
URI:	http://fulir.irb.hr/id/eprint/9805
DOI:	10.1016/j.physletb.2023.138080

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