Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental evidence of the $^6$He level at $E^*$ = 18.3 MeV by the
  $^4$He+$^3$H three-body reaction   Measurements of the t-t and p-t coincidence events in the $^3$H ($\alpha$,
ttp) reaction have been obtained at $E_\alpha$ incident energy of 67.2 MeV.
Various appropriate angular configurations of detectors were chosen in order to
observe the population of the $^6$He$^*$ state at around 18 MeV. Its
contribution appears at the $E_{\rm tt}$ relative energy of 6.0 MeV by the
analysis of bidimensional spectra. We found the formation of the $^6$He excited
state at $E^* = 18.3 \pm 0.2$ MeV (with a $\Gamma$ width of 1.1 $\pm$ 0.3 MeV)
by the decay into the t+t binary channel, since the threshold energy of the t+t
channel is 12.31 MeV. In each analyzed bidimensional energy spectrum of
($E_{\rm t}$, $E_{\rm t}$) and ($E_{\rm p}$, $E_{\rm t}$) coincidence events
resonance structures are present due to the formation of both $^6$He$^*$ and
$^4$He$^*$ excited states. Our results on the $E^*$ and $\Gamma$ values
regarding the $^6$He$^*$ level of about 18 MeV are compared with the results
obtained by other reactions. Moreover, we also found new $\Gamma$ width values
of 0.7 $\pm$ 0.3 and 0.8 $\pm$ 0.4 MeV for the 14.0 $\pm$ 0.4 and 16.1 $\pm$
0.4 MeV $^6$He levels, respectively.

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The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: stat