Eur. Phys. J. A (2020) 56: 1
https://doi.org/10.1140/epja/s10050-019-00020-y

Special Article - New Tools and Techniques

Simulation of a recoil mass spectrometer for measurement of differential quasi-elastic scattering cross sections

A semi-microscopic Monte Carlo code

Nuclear Physics Group, Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi, 110067, India

^* e-mail: subir@iuac.res.in

Received: 27 August 2019
Accepted: 14 November 2019
Published online: 8 January 2020

Abstract

We report development of a semi-microscopic Monte Carlo code to calculate the transmission efficiency of a recoil mass spectrometer for quasi-elastic scattering. Realistic distributions of angle, energy and charge state of the forward-moving target-like ions are generated event by event. Particle trajectories are calculated employing first-order ion-optical transfer matrices. We present results for two test reactions, viz. O+Sn and Ni+Sn assuming Rutherford scattering at projectile energies near the Coulomb barrier. This work has an important application in determining barrier distributions from quasi-elastic back-scattering measurements employing recoil mass spectrometers. The code can also be utilized to simulate multi-nucleon transfer reactions and adapted for other similar recoil separators because of its modular structure.