Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of \gamma-irradiation on superconducting transition temperature
  and resistive transition in polycrystalline YBa_{2}Cu_{3}O_(7-\delta)   A bulk polycrystalline sample of YBa_(2)Cu_(3)O_(7-\delta) (\delta \approx
0.1) has been irradiated by \gamma-rays with ^{60}Co source. Non-monotonic
behavior of T_{c} with increasing irradiation dose \Phi (up to 220 MR) is
observed: T_{c} decreases at low doses (\Phi < 50 MR) from initial value
(\approx 93 K) by about 2 K and then rises, forming a minimum. At higher doses
(\Phi > 120 MR) T_{c} goes down again. The temperature width of resistive
transition increases rather sharply with dose below 75 MR and drops somewhat at
higher dose. The results observed are discussed, taking into account the
granular structure of sample studied and the influence of \gamma-rays on
intergrain Josephson coupling.

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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph