Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coulomb excitation of $^{68}$Ni at safe energies   The $B(E2;0^+\to2^+)$ value in $^{68}$Ni has been measured using Coulomb
excitation at safe energies. The $^{68}$Ni radioactive beam was
post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted
$\gamma$ rays were detected by the MINIBALL detector array. A kinematic
particle reconstruction was performed in order to increase the measured c.m.
angular range of the excitation cross section. The obtained value of
2.8$^{+1.2}_{-1.0}$ 10$^2$ e$^2$fm$^4$ is in good agreement with the value
measured at intermediate energy Coulomb excitation, confirming the low
$0^+\to2^+$ transition probability.

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The categories of this paper are: gr-qc
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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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: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: hep-th