Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Thermodynamical Properties in the $^{162}$Dy, $^{166}$Er
  and $^{172}$Yb Nuclei   The density of accessible levels in the ($^3$He,$\alpha \gamma$) reaction has
been extracted for the $^{162}$Dy, $^{166}$Er and $^{172}$Yb nuclei. The
nuclear temperature is measured as a function of excitation energy in the
region of 0 -- 6 MeV. The temperature curves reveal structures indicating new
degrees of freedom. The heat capacity of the nuclear system is discussed within
the framework of a canonical ensemble.

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The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
26
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: atom-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
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The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ