Ratios of 15N/12C and 4He/12C inclusive electroproduction cross sections in the nucleon resonance region

TL;DR

This study measures the ratios of inclusive electron scattering cross sections for 15N/12C and 4He/12C in the nucleon resonance region, revealing resonance structures and confirming phenomenological models across a range of kinematic conditions.

Contribution

It provides new high-precision measurements of these ratios over a broad kinematic range, enhancing understanding of nuclear resonance behavior and validating existing models.

Findings

15N/12C ratios show slight resonance structure consistent with models.

4He/12C ratios exhibit significant resonance peaks at specific W values.

Results support extrapolation of DIS ratios to low Q2.

Abstract

The (W,Q2)-dependence of the ratio of inclusive electron scattering cross sections for 15N/12C was determined in the kinematic range 0.8<W<2 GeV and 0.2<Q2<1 GeV2 using 2.285 GeV electrons and the CLAS detector at Jefferson Lab. The ratios exhibit only slight resonance structure, in agreement with a simple phenomenological model and an extrapolation of DIS ratios to low Q2. Ratios of 4He/12C using 1.6 to 2.5 GeV electrons were measured with very high statistical precision, and were used to correct for He in the N and C targets. The (W,Q2) dependence of the 4He/12C ratios is in good agreement with the phenomenological model, and exhibit significant resonance structure centered at W=0.94, 1.23 and 1.5 GeV.