Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonmesonic weak decay of $\Lambda$ hypernuclei within a nuclear matter
  framework   The nonmesonic weak decay of $\Lambda$ hypernuclei is studied using nuclear
matter. We have developed a formalism which gives a microscopic interpretation
of the process of emission of particles originated in this decay. More
specifically, our scheme provides a unified treatment of $\Gamma(\Lambda N \to
NN$) and $N_{N}$ ($N_{NN}$), the $\Lambda$ non-mesonic weak decay widths and
the number of emitted particles (pair of particles) of kind $N$ ($NN$),
respectively. We have also evaluated for the first time the quantum
interference terms between the $n$- and $p$-induced weak decay amplitudes.
Explicit expressions for $N_{N}$ and $N_{NN}$ are shown within the ring
approximation. Using the local density approximation together with the ring
approximation, we report results for the decay of the $^{12}_{\Lambda}C$
hypernucleus. We have obtained values for the ratio $N_{n}/N_{p}$
($N_{nn}/N_{np}$) in the range $1.4-1.6$ ($0.2-0.3$), where no energy threshold
have been employed. The $n$- and $p$-induced interference terms modify in less
than $\sim 3 %$ these results.

32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con