Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Further evidence for energy sorting from the even-odd effect in
  fission-fragment element distributions   The even-odd effect in fission is explained by a model based on statistical
mechanics. It reveals that the variation of the even-odd effect with the mass
of the fissioning nucleus and the increase towards asymmetric splits is due to
the important statistical weight of configurations where the light fission
fragment populates the ground state of an even-even nucleus. This implies that
entropy drives excitation energy and unpaired nucleons predominantly to the
heavy fragment. Therefore, the even-odd effect is an additional signature of
the recently discovered energy-sorting process in fission.

25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc