Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for tetrahedral symmetry in 16O   We derive the rotation-vibration spectrum of a 4-alpha configuration with
tetrahedral symmetry, T_d, and show evidence for the occurrence of this
symmetry in the low-lying spectrum of 16O. All vibrational states with A, E and
F symmetry appear to have been observed, as well as the rotational bands with
L(P)=0(+), 3(-), 4(+), 6(+) on the A states, and part of the rotational bands
built on the E, F states. We derive analytic expressions for the form factors
and B(EL) values of the ground state rotational band and show that the measured
values support the tetrahedral symmetry of this band.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg