Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge and frequency resolved isochronous mass spectrometry in storage
  rings: First direct mass measurement of the short-lived neutron-deficient
  $^{51}$Co nuclide   Revolution frequency measurements of individual ions in storage rings require
sophisticated timing detectors. One of common approaches for such detectors is
the detection of secondary electrons released from a thin foil due to
penetration of the stored ions. A new method based on the analysis of
intensities of secondary electrons was developed which enables determination of
the charge of each ion simultaneously with the measurement of its revolution
frequency. Although the mass-over-charge ratios of $^{51}$Co$^{27+}$ and
$^{34}$Ar$^{18+}$ ions are almost identical, and therefore, the ions can not be
resolved in a storage ring, by applying the new method the mass excess of the
short-lived $^{51}$Co is determined for the first time to be
ME($^{51}$Co)=-27342(48) keV. Shell-model calculations in the $fp$-shell nuclei
compared to the new data indicate the need to include isospin-nonconserving
forces.

14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
2
The categories of this paper are: math