# Studies of the Three-Body Breakup in Deuteron-Deuteron Collisions near the Quasi-Free Limit at 160 MeV

## TL;DR

This study measures the differential cross sections of the three-body deuteron-deuteron breakup at 160 MeV, comparing experimental data with theoretical SSA calculations to evaluate their accuracy near the quasi-free scattering regime.

## Contribution

It provides new experimental cross section data for the deuteron-deuteron breakup at 160 MeV and assesses the validity of SSA calculations at this energy.

## Key findings

- SSA predicts the correct order of magnitude for the cross sections.
- Experimental data near the quasi-free limit show SSA's limitations at this energy.
- The energy may be too low for SSA assumptions to hold accurately.

## Abstract

A set of differential cross section of the three-body $^{2}$H($d$,$dp$)$n$ breakup reaction at 160 MeV deuteron beam energy are presented for 147 kinematically complete configurations near the quasi-free scattering kinematics. The experiment was performed at KVI in Groningen, the Netherlands using the BINA detector. The cross-section data have been normalized to the $^{2}$H($d$,$d$)$^{2}$H elastic scattering cross section. The data are compared to the recent single-scattering approximation (SSA) calculations for three-cluster breakup in deuteron-deuteron collisions. Confronting the SSA predictions with the experimental data shows that SSA provides the correct order of magnitude of the cross-section data. The studied energy is probably too low to meet the SSA assumptions which prevents better accuracy of the description.