Isochronous mass spectrometry at the RIKEN Rare-RI Ring facility

Abstract

A dedicated isochronous storage ring, named the Rare-RI Ring, was constructed at the RI Beam Factory of RIKEN, aiming at precision mass measurements of nuclei located in uncharted territories of the nuclear chart. The Rare-RI Ring employs the isochronous mass spectrometry technique with the goal to achieve a relative mass precision of $10^{-6}$ within a measurement time of less than 1 ms. The performance of the facility was demonstrated through mass measurements of neutron-rich nuclei with well-known masses. Velocity or magnetic rigidity is measured for every particle prior to its injection into the ring, wherein its revolution time is accurately determined. The latter quantity is used to determine the mass of the particle, while the former one is needed for non-isochronicity corrections. Mass precisions on the order of $10^{-5}$ were achieved in the first commissioning, which demonstrates that Rare-RI Ring is a powerful tool for mass spectrometry of short-lived nuclei.

References in corpus (11)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
• Identification of strontium in the merger of two neutron stars
• Heavy-Ion Storage Rings and Their Use in Precision Experiments with Highly Charged Ions
• Mass measurements beyond the major r-process waiting point 80Zn
• First application of mass measurement with the Rare-RI Ring reveals the solar r-process abundance trend at A=122 and A=123
• Sensitivity study of \emph{r}-process abundances to nuclear masses
• $B\rho$-defined Isochronous Mass Spectrometry and Mass Measurements of ${}^{58}$Ni Fragments
• $B\rho$-defined isochronous mass spectrometry: a new approach for high-precision mass measurements of short-lived nuclei
• Development and operation of an electrostatic time-of-flight detector for the Rare RI storage Ring