Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of electron screening on the $\alpha$ decay   The physical principles that determine the effect of the electron shell of an
atom on the alpha decay rate of the nucleus are presented. The effect is shown
to be negative. Numerical calculations of the effect in helium-like ions are
performed. It accounts for more than 80% of the effect in neutral atoms. The
prospects for experimental detection of the effect in the storage rings of the
GSI Darmstadt, ISF Lanzhou are discussed.

7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat