The study of quasifree Compton scattering on the neutron in the energy range of E-gamma = 0.75-1.5 GeV is presented. The data reveal a narrow peak at W similar to 1.685 GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at W similar to 1.68 GeV in eta photoproduction on the neutron, suggests the existence of a nucleon resonance with unusual properties: a mass M similar to 1.685 GeV, a narrow width Gamma <= 30 MeV, and the much stronger photoexcitation on the neutron than on the proton.

Evidence for a narrow N*(1685) resonance in quasifree Compton scattering on the neutron

BELLINI, Vincenzo;MAMMOLITI, FRANCESCO;RUSSO, Giuseppe;SUTERA, CONCETTA MARIA;
2011

Abstract

The study of quasifree Compton scattering on the neutron in the energy range of E-gamma = 0.75-1.5 GeV is presented. The data reveal a narrow peak at W similar to 1.685 GeV. This result, being considered in conjunction with the recent evidence for a narrow structure at W similar to 1.68 GeV in eta photoproduction on the neutron, suggests the existence of a nucleon resonance with unusual properties: a mass M similar to 1.685 GeV, a narrow width Gamma <= 30 MeV, and the much stronger photoexcitation on the neutron than on the proton.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/11724
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 32
  • ???jsp.display-item.citation.isi??? 31
social impact