First Measurement of the EMC Effect in $^{10}$B and $^{11}$B

TL;DR

This study presents the first measurements of the EMC effect in boron isotopes $^{10}$B and $^{11}$B, revealing minimal nuclear dependence and supporting the idea that the effect is mainly influenced by local nuclear structure.

Contribution

First experimental measurement of the EMC effect in boron isotopes, providing new data that supports the local nuclear environment hypothesis.

Findings

EMC effect in boron isotopes similar to $^9$Be and $^{12}$C

Almost no nuclear dependence in the EMC effect for $A=4-12$

Supports the hypothesis that the EMC effect depends on local nuclear structure

Abstract

The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in $^{10}$B and $^{11}$B. Previous measurements of the EMC effect in $A \leq 12$ nuclei showed an unexpected nuclear dependence; $^{10}$B and $^{11}$B were measured to explore the EMC effect in this region in more detail. Results are presented for $^9$Be, $^{10}$B, $^{11}$B, and $^{12}$C at an incident beam energy of 10.6~GeV. The EMC effect in the boron isotopes was found to be similar to that for $^9$Be and $^{12}$C, yielding almost no nuclear dependence in the EMC effect in the range $A=4-12$. This represents important, new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei.