Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit

Abstract

Isochronous Mass Spectrometry (IMS) in heavy-ion storage rings is an excellent experimental method for precision mass measurements of exotic nuclei. In the IMS, the storage ring is tuned in a special isochronous ion-optical mode. Thus, the mass-over-charge ratios of the stored ions are directly reflected by their respective revolution times in first order. However, the inevitable momentum spread of secondary ions increases the peak widths in the measured spectra and consequently limits the achieved mass precision. In order to achieve a higher mass resolving power, the ring aperture was reduced to 60 mm by applying a mechanical slit system at the dispersive straight section. The momentum acceptance was reduced as well as better isochronous conditions were achieved. The results showed a significant improvement of the mass resolving power reaching $5.2\times 10^5$, though at the cost of about 40\% ion loss.

arXiv comment6 pages, 6 figures, proceeding of EMIS2018

References in corpus (10)

• Nuclear Physics Experiments with Ion Storage Rings
• Isochronous mass measurements of $T_z=-1$ $fp$-shell nuclei from projectile fragmentation of ${}^{58}$Ni
• Identification of the Lowest $T=2$, $J^{\pi =}{0}^{+}$ Isobaric Analog State in ${}^{52}$Co and Its Impact on the Understanding of $\beta$-Decay Properties of ${}^{52}$Ni
• Mass Measurements of Neutron-Deficient Y, Zr, and Nb Isotopes and Their Impact on $rp$ and $\nu p$ Nucleosynthesis Processes
• An improvement of isochronous mass spectrometry: Velocity measurements using two time-of-flight detectors
• Isochronicity Correction in the CR Storage Ring
• A method to measure the transition energy ${\gamma }_t$ of the isochronously tuned storage ring
• The Masses of the $T_z=-3/2$ Nuclei ${}^{27}$P and ${}^{29}$S
• Experimental Investigation of the Transition Energy ${\gamma }_t$ in the Isochronous Mode of the HIRFL-CSRe
• Application of isochronous mass spectrometry for the study of angular momentum population in projectile fragmentation reactions

Cited by in corpus (2)

• $B\rho$-defined Isochronous Mass Spectrometry and Mass Measurements of ${}^{58}$Ni Fragments
• Masses of ground and isomeric states of ${}^{101}$In and configuration-dependent shell evolution in odd-$A$ indium isotopes