English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We develop a theoretical framework for the evaluation of the coincidencenumber of pairs, $N_{nN}$, and the asymmetry parameter, $a_\Lambda$, innonmesonic hypernuclear decay $\Lambda N\rightarrow nN$. The primary nomesonicweak hyperon-nucleon decay process is described through the independentparticle shell model. When the effect of the strong interactions experimentedby the two nucleons leaving the residual nucleus is included, we have inaddition to the $2p1h$ primary configuration $2p'1h'$, $3p2h$, $4p3h$,$\cdots$, etc secondary ones. We work within the $2p'1h'$ subspace of finalstates assuming a simple approach for finite nuclei based on the eikonalapproximation. An optical potential including the nucleon-nucleus isoscalar andisovector interaction is introduced to take into account the minimum nuclearmedium effects and to describe the nucleon-nucleus dispersion process along theoutgoing path. We applied the proposed description to the calculation of theobservables in $^{5}_\Lambda He$ and $^{12}_\Lambda C$ nonmesonic decays. Thecalculated results show that our treatment of FSI even considered as restrictedto a subspace of states gives a good agreement with experimental data, similarto that ones presented by more elaborated evaluations. This indicates that thedeveloped theoretical scheme seems to be appropriated to include more complexconfigurations. We also discuss the ground state normalization effects at themoment of including the two-nucleon induced decay ($\Lambda NN \rightarrownNN$) contribution.

Evaluation of coincidence number of pairs and asymmetry parameter in nonmesonic hypernuclear decay