A1 Journal article (refereed)
Alpha spectroscopy of purified beams of exotic nuclei at the FRS Ion Catcher (2025)


Tortorelli, N., Reiter, M. P., Rink, A. K., Purushothaman, S., Ayet, S. A. S., Bergmann, J., Dickel, T., Diwisch, M., Ebert, J., Geissel, H., Greiner, F., Haettner, E., Hornung, C., Kelic-Heil, A., Knoebel, R., Lippert, W., Miskun, I., Moore, I. D., Pietri, S., . . . Xu, X. (2025). Alpha spectroscopy of purified beams of exotic nuclei at the FRS Ion Catcher. Nuclear Physics A, 1053, Article 122967. https://doi.org/10.1016/j.nuclphysa.2024.122967


JYU authors or editors


Publication details

All authors or editorsTortorelli, Nazarena; Reiter, Moritz Pascal; Rink, Ann Kathrin; Purushothaman, Sivaji; Ayet, San Andrés Samuel; Bergmann, Julian; Dickel, Timo; Diwisch, Marcel; Ebert, Jens; Geissel, Hans; et al.

Journal or seriesNuclear Physics A

ISSN0375-9474

eISSN1873-1554

Publication year2025

Publication date03/10/2024

Volume1053

Article number122967

PublisherElsevier

Publication countryNetherlands

Publication languageEnglish

DOIhttps://doi.org/10.1016/j.nuclphysa.2024.122967

Publication open accessNot open

Publication channel open access

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/97623


Abstract

The FRS Ion Catcher (FRS-IC) is located at the final focal plane of the Fragment Separator FRS at GSI. The FRS-IC setup is well known for high-precision experiments with stopped exotic nuclei produced by projectile fragmentation and fission. The facility consists of the cryogenic gas-filled stopping cell (CSC), an RFQ-based beamline (DISTRICT), and a multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). This paper illustrates how alpha spectroscopy performed at this facility has emerged as a promising tool to unveil the nuclear structure of exotic nuclei, i.e., half-live and decay energy measurements. First studies of that kind were performed on the decay chains of 218Rn, 219Rn, 221Ac, 220Fr, and 223,224Th produced by projectile fragmentation of 238U. The α decay energy measurements performed and the deduced Qα values confirm the known maximum at N= 128 and the values of Qα at N= 132 − 133 follows the predicted increasing in Qα values compared to the values for At isotopes at the same neutron number N. Further, the production rate ratio of the isomer to the ground state of 211Po was measured. It allows an estimate of the angular momentum distribution of 211Po fragments following fragmentation of 238U in a 9Be target at relativistic energies. In addition, the potential of mass-selected decay spectroscopy behind the MR-TOF-MS was demonstrated with short-lived 215Po ions (t1/2 = 1.78ms). This demonstrates that the FRS-IC is a reliable setup for α spectroscopy studies and related nuclear structure studies.


Keywordsnuclear physicshalf lifespectroscopy

Free keywordsFRS-IC; α-spectroscopy; nuclear structure; half-life


Contributing organizations


Ministry reportingYes

VIRTA submission year2024

JUFO rating1

Preliminary JUFO rating1


Last updated on 2024-02-11 at 20:06