Observation of New Isotopes in the Fragmentation of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>Pt</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>198</mn></mrow></mmultiscripts></mrow></math> at FRIB

O. B. Tarasov; A. Gade; K. Fukushima; M. Hausmann; E. Kwan; M. Portillo; M. Smith; D. S. Ahn; D. Bazin; R. Chyzh; S. Giraud; K. Haak; T. Kubo; D. J. Morrissey; P. N. Ostroumov; I. Richardson; B. M. Sherrill; A. Stolz; S. Watters; D. Weisshaar; T. Zhang

doi:10.1103/PhysRevLett.132.072501

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Observation of New Isotopes in the Fragmentation of ${}^{198}{Pt}$ at FRIB

O. B. Tarasov ^1,*, A. Gade ^1,2, K. Fukushima ¹, M. Hausmann¹, E. Kwan¹, M. Portillo¹, M. Smith¹, D. S. Ahn³, D. Bazin ^1,2 et al.

R. Chyzh¹, S. Giraud ¹, K. Haak ^1,2, T. Kubo⁴, D. J. Morrissey ^1,5, P. N. Ostroumov^1,2, I. Richardson ^1,2, B. M. Sherrill^1,2, A. Stolz¹, S. Watters ^1,2, D. Weisshaar ¹, and T. Zhang ¹

¹Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA
²Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
³Center for Exotic Nuclear Studies, Institute for Basic Science, Daejeon 34126, Republic of Korea
⁴RIKEN Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁵Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

^*tarasov@frib.msu.edu

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Phys. Rev. Lett. 132, 072501 – Published 15 February, 2024

DOI: https://doi.org/10.1103/PhysRevLett.132.072501

Abstract

Five previously unknown isotopes ( ${}^{182, 183}{Tm}$ , ${}^{186, 187}{Yb}$ , ${}^{190}{Lu}$ ) were produced, separated, and identified for the first time at the Facility for Rare Isotope Beams (FRIB) using the Advanced Rare Isotope Separator (ARIS). The new isotopes were formed through the interaction of a ${}^{198}{Pt}$ beam with a carbon target at an energy of $186 MeV / u$ and with a primary beam power of 1.5 kW. Event-by-event particle identification of $A$ , $Z$ , and $q$ for the reaction products was performed by combining measurements of the energy loss, time of flight, magnetic rigidity $B ρ$ , and total kinetic energy. The ARIS separator has a novel two-stage design with high resolving power to strongly suppress contaminant beams. This successful new isotope search was performed less than one year after FRIB operations began and demonstrates the discovery potential of the facility which will ultimately provide 400 kW of primary beam power.

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Five New Isotopes Is Just the Beginning

Published 15 February, 2024

Less than a year after its opening, the Facility for Rare Isotope Beams produced five never-before-seen isotopes for observation, a success that researchers say highlights the discovery potential of the facility.

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Observation of New Isotopes in the Fragmentation of ${}^{198}{Pt}$ at FRIB