CREMA: Collinear Resonance for Exotic Molecules and Atoms
Abstract
The Collinear Resonance for Exotic Molecules and Atoms (CREMA) setup has been developed and commissioned at the Massachusetts Institute of Technology's Laboratory for Nuclear Science. The instrument combines the Doppler-suppressed resolution of the collinear fast-beam geometry with the selectivity of resonance ionization, for precision measurements of hyperfine structure and isotope shifts in atoms and molecules. We describe the setup, including the ion-optical simulations in which a multi-objective evolutionary algorithm provided the starting settings for the beam transport, and report commissioning measurements of the hyperfine structure of 133Cs. The extracted hyperfine constants agree with literature values within one standard deviation, demonstrating the operational readiness of the setup. CREMA mirrors the Resonance Ionization Spectroscopy Experiment at the Facility for Rare Isotope Beams and serves as its offline counterpart for the development of laser ionization schemes and techniques for future studies of exotic atoms and molecules.
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BibTeX
@misc{cruz2026crema,
title = {{CREMA: Collinear Resonance for Exotic Molecules and Atoms}},
author = {Fabian C. Pastrana Cruz and Shane G. Wilkins and Alex J. Brinson and Paul Fischer and Mathieu Flayol and Derick Gonzalez-Acevedo and Jackson Hacias and Jason Huskey and Haruka Kakioka and Carina Kanitz and Jonas Karthein and Simon Lechner and Stephan Malbrunot-Ettenauer and Scott Moroch and Jose M. Munoz and Moritz P. Reiter and Mikael Reponen and Lutz Schweikhard and Silviu M. Udrescu and Adam R. Vernon and Markus Vilen and Ronald F. Garcia Ruiz},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.30522},
eprint = {2610.30522},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.30522},
}
RIS
TY - UNPB
TI - CREMA: Collinear Resonance for Exotic Molecules and Atoms
AU - Fabian C. Pastrana Cruz
AU - Shane G. Wilkins
AU - Alex J. Brinson
AU - Paul Fischer
AU - Mathieu Flayol
AU - Derick Gonzalez-Acevedo
AU - Jackson Hacias
AU - Jason Huskey
AU - Haruka Kakioka
AU - Carina Kanitz
AU - Jonas Karthein
AU - Simon Lechner
AU - Stephan Malbrunot-Ettenauer
AU - Scott Moroch
AU - Jose M. Munoz
AU - Moritz P. Reiter
AU - Mikael Reponen
AU - Lutz Schweikhard
AU - Silviu M. Udrescu
AU - Adam R. Vernon
AU - Markus Vilen
AU - Ronald F. Garcia Ruiz
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.30522
UR - https://arxiv.org/abs/2610.30522
AB - The Collinear Resonance for Exotic Molecules and Atoms (CREMA) setup has been developed and commissioned at the Massachusetts Institute of Technology's Laboratory for Nuclear Science. The instrument combines the Doppler-suppressed resolution of the collinear fast-beam geometry with the selectivity of resonance ionization, for precision measurements of hyperfine structure and isotope shifts in atoms and molecules. We describe the setup, including the ion-optical simulations in which a multi-objective evolutionary algorithm provided the starting settings for the beam transport, and report commissioning measurements of the hyperfine structure of 133Cs. The extracted hyperfine constants agree with literature values within one standard deviation, demonstrating the operational readiness of the setup. CREMA mirrors the Resonance Ionization Spectroscopy Experiment at the Facility for Rare Isotope Beams and serves as its offline counterpart for the development of laser ionization schemes and techniques for future studies of exotic atoms and molecules.
ER -