New results on Mesonic Weak Decay of $p$-shell $\Lambda$-Hypernuclei

Abstract

The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of $p$-shell $\Lambda$-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with magnetic analysis for the first time for ${}_{\Lambda }^{7}Li$, ${}_{\Lambda }^{9}Be$, ${}_{\Lambda }^{11}B$ and ${}_{\Lambda }^{15}N$. The shape of the ${\pi }^{-}$ spectra was interpreted through a comparison with pion distorted wave calculations that take into account the structure of both hypernucleus and daughter nucleus. Branching ratios ${\Gamma }_{{\pi }^{-}}/{\Gamma }_{tot}$ were derived from the measured spectra and converted to ${\pi }^{-}$ decay rates ${\Gamma }_{{\pi }^{-}}$ by means of known or extrapolated total decay widths ${\Gamma }_{tot}$ of $p$-shell $\Lambda$-hypernuclei. Based on these measurements, the spin-parity assignment $1/2^{+}$ for ${}_{\Lambda }^{7}Li$ and $5/2^{+}$ for ${}_{\Lambda }^{11}B$ ground-state are confirmed and a spin-parity $3/2^{+}$ for ${}_{\Lambda }^{15}N$ ground-state is assigned for the first time.

14 pages, 5 figures

References in corpus (10)

• In-medium nuclear interactions of low-energy hadrons
• First Results on 12Lambda-C production at DAPHNE
• Mesonic and nonmesonic weak decay widths of medium-heavy lambda hypernuclei
• Correlated $\Lambda d$ pairs from the $K_{stop}^{-}A\to \Lambda d{A}^{\prime }$ reaction
• Gamma-Ray Spectroscopy of ${}_{\Lambda }^{16}$O and ${}_{\Lambda }^{15}$N Hypernuclei via the ${}^{16}$O$(K^{-},{\pi }^{-})$ reaction
• Measurement of the proton spectra from Non-Mesonic Weak Decay of ${}_{\Lambda }^{5}He$, ${}_{\Lambda }^{7}Li$ and ${}_{\Lambda }^{12}C$
• Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude
• pi^- decay rates of p-shell hypernuclei revisited
• Measurement of the ${\pi }^{-}$ decay width of ${}_{\Lambda }^5$He
• Correlated $\Lambda t$ pairs from the absorption of $K^{-}$ at rest in light nuclei

Cited by in corpus (23)

• Strangeness in nuclear physics
• Strangeness nuclear physics: a critical review on selected topics
• Shell-model calculations for p-shell hypernuclei
• On the Binding Energy and the Charge Symmetry Breaking in A<=16 Lambda-hypernuclei
• Hypernuclear spectroscopy with K${}^{-}$ at rest on ${}^7$Li, ${}^9$Be, ${}^{13}$C and ${}^{16}$O
• First observation of the hyper superheavy hydrogen 6ΛH
• Proton spectra from Non-Mesonic Weak Decay of p-shell Lambda-Hypernuclei and evidence for the two-nucleon induced process
• Implications of an increased $\Lambda$-separation energy of the hypertriton
• Jacobi no-core shell model for $p$-shell hypernuclei
• Single and double coincidence nucleon spectra in the weak decay of Lambda hypernuclei
• The $A(K_{stop}^{-},{\pi }^{\pm }{\Sigma }^{\mp })A^{\prime }$ reaction on p-shell nuclei
• First determination of the one-proton induced Non-Mesonic Weak Decay width of p-shell Λ-Hypernuclei
• Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications
• Search for the neutron-rich hypernucleus 9ΛHe
• Structure of p-shell hypernuclei
• Relationships between nonmesonic-weak-decays in different hypernuclei
• Letter of Intent: the NA60+ experiment
• Nonmesonic Hyperon Weak Decay Spectra in ${}_{\Lambda }^{12}$C}
• Nonmesonic weak decay spectra of light hypernuclei
• Charge symmetry breaking in light $\Lambda$ hypernuclei
• Nonmesonic Weak Decay Dynamics from proton spectra of $\Lambda$-Hypernuclei
• Old and New in Strangeness Nuclear Physics
• Charge symmetry breaking in $\Lambda$ hypernuclei: updated HYP 2015 progress report