Abstract

We present an open-source kinematic fitting routine designed for low-energy nuclear physics applications. Although kinematic fitting is commonly used in high-energy particle physics, it is rarely used in low-energy nuclear physics, despite its effectiveness. A FORTRAN and ROOT C++ version of the FUNKI_FIT kinematic fitting code have been developed and published open access. The FUNKI_FIT code is universal in the sense that the constraint equations can be easily modified to suit different experimental set-ups and reactions. Two case studies for the use of this code, utilising experimental and Monte–Carlo data, are presented: (1) charged-particle spectroscopy using silicon-strip detectors; (2) charged-particle spectroscopy using active target detectors. The kinematic fitting routine provides an improvement in resolution in both cases, demonstrating, for the first time, the applicability of kinematic fitting across a range of nuclear physics applications. The ROOT macro has been developed in order to easily apply this technique in standard data analysis routines used by the nuclear physics community.

Highlights

  • In all nuclear physics experiments, measurements are subject to various uncertainties, both statistical and systematic

  • The present paper clearly demonstrates, for the first time, the usefulness of kinematic fitting in the field of low-energy nuclear physics, across a range of reaction types and detector systems

  • The aim of this paper is to introduce a kinematic fitting framework, FUNKI_FIT, which may be utilised by the nuclear physics community to improve the resolution in a variety of data analyses

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Summary

Introduction

In all nuclear physics experiments, measurements are subject to various uncertainties, both statistical and systematic. A typical experiment involves a beam of accelerated sub-atomic particles impinging on a target. Upon a nuclear reaction taking place, radiation is emitted. Such experiments involve measuring this radiation (charged ions, electrons, neutrons or electromagnetic radiation) and using it to reconstruct the reaction taking place. Charged ions may be detected using silicon-strip detectors or gaseous time projection chambers (TPCs) [1,2,3]. Such devices provide information about the energies and directions of the particles they detect

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