The Transparency of 12C for Protons

Abstract

Existing cross-section data for 1p-shell knockout in the reaction 12C(e,e'p) - as obtained under different kinematic conditions - are shown to be mutually consistent, apart from a recent measurement performed in Mainz. New data have been collected at the Amsterdam Pulse Stretcher that confirm the normalization of the older measurements. An analysis of the world's 12C(e,e'p) data has yielded precise values of the spectroscopic factor for 1p-shell and 1s-shell knockout from 12C. These values have been used to evaluate the transparency of the 12C nucleus for 1p-shell and 1s-shell protons separately on the basis of recent high-energy 12C(e,e'p) data taken at a four-momentum transfer squared of 1.1 GeV/c^2. As the resulting average value of the nuclear transparency, 0.81(0.04), is considerably higher than the value obtained from previous analyses and theoretical estimates, the high Q^2 data were used instead for an independent determination of the spectroscopic strength for 1p + 1s knockout. Combining these results with the low Q^2 data the spectroscopic factors appear to be momentum-transfer dependent. Possible explanations of these surprising results in terms of reaction-mechanism effects or a possible breakdown of the quasi-particle concept at high Q^2 are discussed as well.

11 pages 8 figures

References in corpus (1)

• Quasielastic 12C(e,e'p) Reaction at High Momentum Transfer

Cited by in corpus (30)

• Self-consistent Green's function method for nuclei and nuclear matter
• Nucleon-Nucleon Correlations, Short-lived Excitations, and the Quarks Within
• Correlated Strength in Nuclear Spectral Function
• Hadrons in the Nuclear Medium
• Survey of ground state neutron Spectroscopic Factors from Li to Cr isotopes
• Nuclear transparency from quasielastic A(e,e'p) reactions uo to Q^2=8.1 (GeV/c)^2
• Signals for black body limit in coherent ultraperipheral heavy ion collisions
• Predictions of the Generalized Glauber Model for the coherent $\rho$-production at RHIC and the STAR data
• New Results on Short-Range Correlations in Nuclei
• Relativistic nuclear structure effects in (e,e' vec{p})
• New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility
• Nuclear Transparency in Monte Carlo Neutrino Event Generators
• The dynamics of the quasielastic 16O(e,e'p) reaction at Q^2 = 0.8 (GeV/c)^2
• Signatures of Nucleon Disappearance in Large Underground Detectors
• RDWIA analysis of 12C(e,e'p) for Q^2 < 2 (GeV/c)^2
• Single particle strength restoration and nuclear transparency in high Q^2 exclusive (e,e'p) reactions
• Onset of Perturbative Color Opacity at Small x and Upsilon Coherent Photoproduction off heavy nuclei at LHC
• Nucleon-nucleon correlations and the single-particle strength in atomic nuclei
• Effects of Rescattering in (e,e'p) Reactions within a Semiclassical Model
• Nuclear final-state interactions in deep inelastic scattering off the lightest nuclei
• First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND
• Backward emitted high-energy neutrons in hard reactions of p and pi^+ on carbon
• Correlated nucleons in configuration space
• Consistency of spectroscopic factors from (e,e'p) reactions at different momentum transfers
• Bridging Two Ways of Describing Final-State Interactions in A(e,e'p) Reactions
• Probing coherent charmonium photoproduction off light nuclei at medium energies
• Final-state interactions in neutrino-induced proton knockout from argon in MicroBooNE
• Survey of A_LT' asymmetries in semi-exclusive electron scattering on He4 and C12
• Measurement of $\gamma$ rays from the giant resonances excited by ${}^{12}$C$(p,p^{\prime })$ reaction at 392 MeV and 0${}^{\circ }$
• Cross Section Oscillations in the Coherent Charmonium Photoproduction off Nuclei at Moderate Energies