Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Activation cross section measurement of the 14N(p,gamma)15O
  astrophysical key reaction   14N(p,gamma)15O is one of the key reactions of nuclear astrophysics playing a
role in various stellar processes and influencing energy generation of stars,
stellar evolution and nucleosynthesis. For a reliable reaction rate calculation
the low energy cross section of 14N(p,gamma)15O must be known with high
accuracy. Owing to the unmeasurable low cross sections, theoretical
calculations are unavoidable. High precision experimental cross section data
are needed in a wide energy range in order to provide the necessary basis for
low energy extrapolations. In the present work the total 14N(p,gamma)15O cross
section was measured with a method complementary to the available data sets.
The cross section was measured with activation, based on the detection of the
annihilation radiation following the beta+ decay of the reaction product 15O.
This method, which provides directly the astrophysically important total cross
section, was never used for the 14N(p,gamma)15O cross section measurement in
the studied energy range. The non-resonant cross section was measured between
550 keV and 1400 keV center-of-mass energies with total uncertainty of about
10%. The results were compared with literature data using an R-matrix analysis.
It is found that the cross sections measured in this work are in acceptable
agreement with the two recent measurements only if the weak transitions - not
measured in those works - are included. The present data set, being largely
independent from the other available data, can be used to constrain the
extrapolated cross sections to astrophysical energies and helps to make the
astrophysical model calculations more reliable.

32
The categories of this paper are: atom-ph
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex