Kinematics Calibration and Excitation Energy Reconstruction for Solenoidal Spectrometers

Abstract: Solenoidal spectrometers are gaining popularity worldwide due to their large acceptance and superior Q-value resolution in reactions involving radioactive beams. This work introduces a novel recoil energy calibration method leveraging known excited states. Building on this calibration, we describe an algorithm that transforms energy-position data into excitation energy and center-of-mass. This approach has been integrated into the HELIOS online analysis routines, enabling the real-time and speedy generation of excitation energy spectra and angular distributions during experiments.