Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling Law in Cluster Decay   A recently proposed scaling law for the decay time of alpha particles is
generalized for cluster decay. It is shown that for the decay of even-even
parents, $logT_{1/2}$ depends linearly on the scaling variable
S=(Z$_{c}$Z$_{d})^{0.6}/\sqrt{Q_{c}}$ and on the square root of the reduced
mass of cluster and daughter.

7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom