Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First direct mass measurements of nuclides around $Z=100$ with a
  Multireflection Time-of-Flight Mass Spectrograph   The masses of $^{246}$Es, $^{251}$Fm and the transfermium nuclei
$^{249-252}$Md, and $^{254}$No, produced by hot- and cold-fusion reactions, in
the vicinity of the deformed $N=152$ neutron shell closure, have been directly
measured using a multireflection time-of-flight mass spectrograph. The masses
of $^{246}$Es and $^{249,250,252}$Md were measured for the first time. Using
the masses of $^{249,250}$Md as anchor points for $\alpha$ decay chains, the
masses of heavier nuclei, up to $^{261}$Bh and $^{266}$Mt, were determined.
These new masses were compared with theoretical global mass models and
demonstrated to be in good agreement with macroscopic-microscopic models in
this region. The empirical shell gap parameter $\delta_{2n}$ derived from three
isotopic masses was updated with the new masses and corroborate the existence
of the deformed $N=152$ neutron shell closure for Md and Lr.

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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: physics