Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Vector and Tensor Polarisation of Proton and Deuteron
  Beams   Measurement of the d + d -> 4He + eta reaction using vector and tensor
polarised beam has been performed at COSY using Big Karl magnetic spectrograph.
The beam polarisation necessary for obtaining the vector and tensor analysing
power for this reaction was measured. The method and the results of the tensor
polarisation measurement of the deuteron beam are presented.

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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas