Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: HOLMES - The Electron Capture Decay of 163Ho to Measure the Electron
  Neutrino Mass with sub-eV sensitivity   The European Research Council has recently funded HOLMES, a new experiment to
directly measure the neutrino mass. HOLMES will perform a calorimetric
measurement of the energy released in the decay of 163Ho. The calorimetric
measurement eliminates systematic uncertainties arising from the use of
external beta sources, as in experiments with beta spectrometers. This
measurement was proposed in 1982 by A. De Rujula and M. Lusignoli, but only
recently the detector technological progress allowed to design a sensitive
experiment. HOLMES will deploy a large array of low temperature
microcalorimeters with implanted 163Ho nuclei. The resulting mass sensitivity
will be as low as 0.4 eV. HOLMES will be an important step forward in the
direct neutrino mass measurement with a calorimetric approach as an alternative
to spectrometry. It will also establish the potential of this approach to
extend the sensitivity down to 0.1 eV. We outline here the project with its
technical challenges and perspectives.

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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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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: plasm-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph