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# IR Design Requirements

This page discusses the requirements imposed by the EIC physics on the IR design.
The following requirements will be discussed in more detail below

## Breakup Neutrons

For exclusive and diffractive reactions in e-A scattering it is essential to detect the neutron of the nuclear break up in the direction of the outgoing beam. The figure below shows the scattering angle distribution for breakup neutrons from a gold nucleus for different excitation energies of the nucleus.

These distributions lead to the requirement of a angular acceptance of +/- 3mrad to allow to detect these neutrons in the ZDC