Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental (n,$\gamma$) cross sections of the p-process nuclei
  $^{74}$Se and $^{84}$Sr   The nucleosynthesis of elements beyond iron is dominated by the s and r
processes. However, a small amount of stable isotopes on the proton-rich side
cannot be made by neutron capture and are thought to be produced by
photodisintegration reactions on existing seed nuclei in the so-called "p
process". So far most of the p-process reactions are not yet accessible by
experimental techniques and have to be inferred from statistical
Hauser-Feshbach model calculations. The parametrization of these models has to
be constrained by measurements on stable proton-rich nuclei. A series of
(n,$\gamma$) activation measurements, related by detailed balance to the
respective photodisintegrations, were carried out at the Karlsruhe Van de
Graaff accelerator using the $^7$Li(p,n)$^7$Be source for simulating a
Maxwellian neutron distribution of kT= 25 keV. First results for the
experimental (n,$\gamma$) cross sections of the light p nuclei $^{74}$Se and
$^{84}$Sr are reported. These experimental values were used for an
extrapolation to the Maxwellian averaged cross section at 30 keV,
$<\sigma>_{30}$, yielding 271$\pm$15 mb for $^{74}$Se, and 300$\pm$17 mb for
the total capture cross section of $^{84}$Sr. The partial cross section to the
isomer in $^{85}$Sr was found to be 190$\pm$10 mb.

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The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
3
The categories of this paper are: physics