23 research outputs found
Proton spectra from Non-Mesonic Weak Decay of p-shell Lambda-Hypernuclei and evidence for the two-nucleon induced process
New spectra from the FINUDA experiment of the Non Mesonic Weak Decay (NMWD)
proton kinetic energy for 9(Lambda)Be, 11(Lambda)B, 12(Lambda)C, 13(Lambda)C,
15 (Lambda)N and 16(Lambda)O are presented and discussed along with the
published data on 5(Lambda)He and 7(Lambda)Li. Exploiting the large mass number
range and the low energy threshold (15 MeV) for the proton detection of FINUDA,
an evaluation of both Final State Interactions (FSI) and the two nucleon
induced NMWD contributions to the decay process has been done. Based on this
evaluation, a linear dependence of FSI on the hypernuclear mass number A is
found and for the two nucleon stimulated decay rate the experimental value of
Gamma2/Gammap=0.43+-0.25 is determined for the first time. A value for the two
nucleon stimulated decay rate to the total decay rate
Gamma2/GammaNMWD=0.24+-0.10 is also extracted.Comment: 11 pages and 2 figure
Correlated pairs from the absorption of at rest in light nuclei
Novel data from the absorption reaction in light nuclei
Li and Be are presented. The study aimed at finding
correlations. Regardless of , the pairs are preferentially
emitted in opposite directions. Reaction modeling predominantly assigns to the
direct reactions the emission of the
pairs whose yield is found to range from to .
The experiment was performed with the FINUDA spectrometer at DANE (LNF).Comment: 11 pages, 5 figures, accepted for publication in Phys. Lett.
New results on Mesonic Weak Decay of -shell -Hypernucle
The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of 7Λ
Li and 5/2+ for 11
ΛB ground-state are confirmed and a spin-parity 3/2+ for 15
ΛN ground-state is assigned
for the first time.
p-shell Λ-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with
magnetic analysis for the first time for 7Λ
Li, 9
ΛBe, 11
ΛB and 15
ΛN. The shape of the π− 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 Γπ−/Γtot were derived from the
measured spectra and converted to π− decay rates Γπ− by means of known or extrapolated total decay
widths Γtot of p-shell Λ-hypernuclei. Based on these measurements, the spin-parity assignment 1/2+ fo
Mesonic and Non-Mesonic Weak Decay of Hypernuclei with FINUDA
The FINUDA experiment performed a systematic study of both mesonic and non-mesonic weak decay of p-shell Λ-hypernuclei. Recent results on the mesonic decay rates and the non-mesonic decay ratios are illustrated and briefly discussed. © 2009 Elsevier B.V. All rights reserved
Recent results on mesonic weak decay of Λ-hypernuclei
The FINUDA experiment has performed a systematic study of mesonic weak decay of p-shell Λ-hypernuclei. Recent results on the mesonic decay spectra and ratios are illustrated and discussed
Recent results on mesonic weak decay of Lambda-Hypernuclei
The FINUDA experiment had performed a systematic study of mesonic weak decay of p-shell Lambda-hypernuclei. Recent results on the mesonic decay spectra and ratios are illustrated and discussed
NEW RESULTS ON NONMESONIC WEAK DECAY OF Λ HYPERNUCLEI WITH FINUDA
The FINUDA experiment has performed a systematic study of the NonMesonic
Weak Decay (NMWD) of hypernuclei analizing all the data collected from
2003 up to 2007. The results of a measurement of the spectra of protons coming from the NMWD of 5He, 7Li, 9Be, 11 B, 12 C, 13 C, 15 N and 16 O are the subject
of this paper