# Energy calibration of the 2.5 MV Pelletron at the Dalton Cumbrian Facility

## TL;DR

This paper describes the energy calibration of a 2.5 MV Pelletron accelerator using known nuclear reactions to ensure its accuracy for astrophysics experiments.

## Contribution

The study provides a detailed energy calibration and beam energy spread measurement for the Pelletron accelerator at the Dalton Cumbrian Facility.

## Key findings

- The beam energy spread was measured to be 191(38) eV.
- The accelerator's beam energy stability and reproducibility were confirmed for high-energy astrophysics experiments.

## Abstract

We report on the energy calibration of the 2.5 MV Pelletron accelerator at the Dalton Cumbrian Facility in England (UK) using five well-known resonances in the 27Al(p,\documentclass[12pt]{minimal}
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\begin{document}$$\gamma )^{28}$$\end{document}γ)28Si reaction in the proton beam energy range of 632–1800 keV. The beam energy spread was also measured and found to be 191(38) eV. Additionally, we checked the stability and reproducibility of the accelerator’s beam energy, confirming its suitability for nuclear astrophysics experiments, especially in the high-energy regime of stellar evolution and nucleosynthesis.

The online version contains supplementary material available at 10.1140/epja/s10050-025-01622-5.