Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Change of 7Be decay rate in exohedral and endohedral C60 fullerene
  compounds and its implications   The half-life of 7Be implanted in a C60 pellet and gold foil has been
measured to be about the same within about 0.2%. Using a radiochemical
technique, we also measured that the probability of formation of endohedral
7Be@C60 by nuclear implantation technique was (5.6+-0.45)%. It is known from
earlier works that the half-life of endohedral 7Be@C60 is about 1.2% shorter
than that of 7Be implanted in gold. An analysis of these results using linear
muffin-tin orbital method calculations indicates that most of the implanted 7Be
ions in fullerene C60 stay at a distance of about 5.3 Angstrom from the centers
of nearest C60 molecules forming exohedral compounds and those who enter the
fullerene cages go to the centers of the cages forming endohedral 7Be@C60
compounds.

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The categories of this paper are: stat
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph