Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Determination of the Antineutrino Spectrum of the Fission
  Products of $^{238}$U   An experiment was performed at the scientific neutron source FRM II in
Garching to determine the cumulative antineutrino spectrum of the fission
products of $^{238}$U. This was achieved by irradiating target foils of natural
uranium with a thermal and a fast neutron beam and recording the emitted
$\beta$-spectra with a gamma-suppressing electron-telescope. The obtained
$\beta$-spectrum of the fission products of $^{235}$U was normalized to the
data of the magnetic spectrometer BILL of $^{235}$U. This method strongly
reduces systematic errors in the $^{238}$U measurement. The $\beta$-spectrum of
$^{238}$U was converted into the corresponding antineutrino spectrum. The final
$\bar\nu_e$-spectrum is given in 250 keV bins in the range from 2.875 MeV to
7.625 MeV with an energy-dependent error of 3.5 % at 3 MeV, 7.6 % at 6 MeV and
$\gtrsim$ 14 % at energies $\gtrsim$ 7 MeV (68 % confidence level).
Furthermore, an energy-independent uncertainty of $\sim$ 3.3 % due to the
absolute normalization is added. Compared to the generally used summation
calculations, the obtained spectrum reveals a slight spectral distortion of
$\sim$ 10 % but returns the same value for the mean cross section per fission
for the inverse beta decay.

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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
3
The categories of this paper are: physics
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The categories of this paper are: hep-lat
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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: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con