Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Penning-trap mass measurement in the millisecond half-life range:
  the exotic halo nucleus 11Li   In this letter, we report a new mass for $^{11}$Li using the trapping
experiment TITAN at TRIUMF's ISAC facility. This is by far the shortest-lived
nuclide, $t_{1/2} = 8.8 \rm{ms}$, for which a mass measurement has ever been
performed with a Penning trap. Combined with our mass measurements of
$^{8,9}$Li we derive a new two-neutron separation energy of 369.15(65) keV: a
factor of seven more precise than the best previous value. This new value is a
critical ingredient for the determination of the halo charge radius from
isotope-shift measurements. We also report results from state-of-the-art
atomic-physics calculations using the new mass and extract a new charge radius
for $^{11}$Li. This result is a remarkable confluence of nuclear and atomic
physics.

33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph