Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of correlated fission fragments from neutron induced fission
  of Np-237 at incident neutron energies between 200 keV and 100 MeV   Neutron-induced fission of $^{237}$Np has been measured over a wide range of
incident neutron energies using a twin Frisch-gridded ionization chamber
(TFGIC) and a thin-backed $^{237}$Np target. These measurements were performed
at the Los Alamos Neutron Science Center - Weapons Neutron Research (LANSCE -
WNR) facility, which provides a collimated beam of neutrons with energies
ranging from 100s of keV to 100s of MeV. The data were analyzed using the
double-energy ($2E$) method, with mass-dependent corrections for prompt-fission
neutrons and pulse height defect. Pre- and post-neutron evaporation average
total kinetic energy ($\langle TKE\rangle$) values are reported for 54 incident
neutron energies in the energy range $0.20 \le E_n \le 100.0$ MeV and compared
to existing data and evaluations. Pre- and post-neutron evaporation mass yields
were extracted with a full width at half maximum (FWHM) resolution of 4u and
compared to existing data and evaluations. The present $\langle TKE\rangle$ and
mass yield data agree with previous results and also with statistical models of
$^{237}$Np$(n,f)$ at incident neutron energies between $E_n = 0.2 - 20.0$ MeV.
A flattening of the $\langle TKE\rangle$ data is observed (relative to the
prediction of the GEF model) above $E_n = 20.0$ MeV. However, the
interpretation of this discrepancy is unclear as the analysis method's neglect
of incomplete momentum transfer at high energies, as well as pre-equilibrium
pre-fission phenomena likely have a significant impact on the measurement at
such high incident neutron energies.

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The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: stat