Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Z=82 shell closure in neutron-deficient Pb isotopes   Recent mass measurements show a substantial weakening of the binding energy
difference delta_{2p} (Z,N) = E(Z-2,N) - 2 E(Z,N) + E(Z+2,N) in the
neutron-deficient Pb isotopes. As delta_{2p} is often attributed to the size of
the proton magic gap, it might be speculated that the reduction in delta_{2p}
is related to a weakening of the spherical Z=82 shell. We demonstrate that the
observed trend is described quantitatively by self-consistent mean-field models
in terms of deformed ground states of Hg and Po isotopes.

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The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol