Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isospin mixing and Fermi transitions: Selfconsistent deformed mean field
  calculations and beyond   We study Fermi transitions and isospin mixing in an isotopic chain 70-78 Kr
considering various approximations that use the same Skyrme-Hartree-Fock single
particle basis. We study Coulomb effects as well as the effect of BCS and
quasiparticle random phase approximation (QRPA) correlations. A measure of
isospin mixing in the approximate ground state is defined by means of the
expectation value of the isospin operator squared in N=Z nuclei (which is
generalized to N different from Z nuclei). Starting from strict Hartree-Fock
approach without Coulomb, it is shown that the isospin breaking is negligible,
on the order of a few per thousand for (N-Z)=6, increasing to a few percent
with Coulomb. Pairing correlations induce rather large isospin mixing and Fermi
transitions of the forbidden type (beta- for N<Z, and beta+ for N>Z). The
enhancement produced by BCS correlations is compensated to a large extent by
QRPA correlations induced by isospin conserving residual interactions that tend
to restore isospin symmetry.

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The categories of this paper are: q-bio
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: mtrl-th