Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Design optimization of MACHe3, a project of superfuid He3 detector for
  direct Dark Matter search   MACHe3 (MAtrix of Cells of superfluid He3) is a project of a new detector for
direct Dark Matter (DM) search. A cell of superfluid He3 has been developed and
the idea of using a large number of such cells in a high granularity detector
is proposed. This paper presents, after a brief description of the superfluid
He3 cell, the simulation of the response of different matrix configurations
allowing to define an optimum design as a function of the number of cells and
the volume of each cell. The background rejection, for several configurations,
is presented both for neutrons and gamma-rays of various kinetic energies.

22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an