Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Angular distribution of $\gamma$ rays from the p-wave resonance of
  $^{118}$Sn   The neutron energy-dependent angular distribution of $\gamma$ rays from
$^{117}{\rm Sn}(n,\gamma)$ reaction was measured with germanium detectors and a
pulsed neutron beam. The angular distribution was clearly observed in
$\gamma$-ray emissions with an energy of 9327 keV which corresponds to the
transition from a neutron resonance of $^{117}{\rm Sn}+n$ to the ground state
of $^{118}{\rm Sn}$. The angular distribution causes an angular-dependent
asymmetric resonance shape. An asymmetry $A_{\rm LH}$ was defined as $(N_{\rm
L}-N_{\rm H})/(N_{\rm L}+N_{\rm H})$, where $N_{\rm L}$ and $N_{\rm H}$ are
integrated values for lower- and higher-energy regions of a neutron resonance,
respectively. We found that the $A_{\rm LH}$ has the angular dependence of $(A
\cos \theta_\gamma +B)$, where $\theta_\gamma$ is the $\gamma$-ray emission
angle with respect to the incident neutron momentum, with $A=0.394 \pm 0.073$
and $B = 0.118 \pm 0.029$ in the 1.33 eV p-wave resonance.

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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: supr-con
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom