# Initial operation of the recoil mass spectrometer EMMA at the ISAC-II facility of TRIUMF

## TL;DR

EMMA is a newly commissioned recoil mass spectrometer at TRIUMF designed for nuclear reaction studies, combining electrostatic and magnetic deflectors to analyze reaction products with integration for gamma-ray detection and recoil decay spectroscopy.

## Contribution

This paper introduces EMMA, a novel recoil mass spectrometer with a symmetric electrostatic and magnetic design, optimized for nuclear structure and astrophysics research at TRIUMF.

## Key findings

- Successful commissioning of EMMA at TRIUMF
- Effective separation and identification of nuclear reaction products
- Integration with gamma-ray detection and recoil decay spectroscopy

## Abstract

The Electromagnetic Mass Analyser (EMMA) is a new vacuum-mode recoil mass spectrometer currently undergoing the final stages of commissioning at the ISAC-II facility of TRIUMF. EMMA employs a symmetric configuration of electrostatic and magnetic deflectors to separate the products of nuclear reactions from the beam, focus them in both energy and angle, and disperse them in a focal plane according to their mass/charge (m/q) ratios. The spectrometer was designed to accommodate the gamma-ray detector array TIGRESS around the target position in order to provide spectroscopic information from electromagnetic transitions. EMMA is intended to be used in the measurement of fusion evaporation, radiative capture, and transfer reactions for the study of nuclear structure and astrophysics. Its complement of focal plane detectors facilitates the identification of recoiling nuclei and subsequent recoil decay spectroscopy. Here we describe the facility and report on commissioning efforts.