Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SU(2) instantons with boundary jumps and spin tunneling in magnetic
  molecules   Coherent state path integrals are shown in general to contain instantons with
jumps at the boundaries, i.e., with boundary points lying outside classical
parameter or phase space. As an example, the magnetic molecule Fe_8 is studied
using a realistic Hamiltonian, and instanons with jumps are shown to dominate
beyond a certain external magnetic field. An approximate formula is found for
the fields where ground state tunneling is quenched in this molecule.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs