A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$... more A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$ in nuclei has been obtained by the FINUDA experiment. Three events have been found that can be attributed to $^{7}_{\Lambda}$Li and $^{9}_{\Lambda}$Be two nucleon-induced non mesonic weak decays. The kinematic analysis of such events is presented here.
We report on the first two experiments of hypernuclear γ-ray spectroscopy with Hyperball, a large... more We report on the first two experiments of hypernuclear γ-ray spectroscopy with Hyperball, a large-acceptance germanium detector system. In a KEK experiment, we observed two γ transitions in Λ 7 Li, the spin- flip M1(3/2+ → 1/2+) at 691.7 ± 0.6 stat ± 1.0 sys keV and the E2(5/2+ → 1/2+) at 2050.4 ± 0.4 stat ± 0.7 sys keV. The former gives unambiguous information on the strength of the ΛN spin-spin interaction. B(E2) of the latter transition was measured to be \( 3.6 \pm {0.5^{stat}}\,_{ - 0.4}^{ + 0.5}{\,^{sys}}{e^2}f{m^4} \). In the second experiment at BNL, we observed the E2(5/2+, 3/2+ → 1/2+) transitions of Λ 9 Be at around 3.05 MeV.
We report on the two hypernuclear gamma-ray spectroscopy experiments with a germanium detector sy... more We report on the two hypernuclear gamma-ray spectroscopy experiments with a germanium detector system (Hyperball) which is recently constructed. In the first experiment at KEK, we observed two gamma transitions in 7Lambda Li, the E2(5/2+ --> 1/2 +) transition at 2050 ± 2 keV and the spin-flip M1(3/2+ --> 1/2+) transition at 689 ± 4 keV (preliminary). This is the
Novel data from the [Formula: see text] absorption reaction in light nuclei are presented. The da... more Novel data from the [Formula: see text] absorption reaction in light nuclei are presented. The data were collected by the FINUDA spectrometer running at the DAΦNE ϕ-facility, Laboratori Nazionali di Frascati (LNF), Italy.
The FINUDA experiment has performed a systematic study of the NonMesonic Weak Decay (NMWD) of Λ h... more The FINUDA experiment has performed a systematic study of the NonMesonic Weak Decay (NMWD) of Λ 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 [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are the subject of this paper.
A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$... more A direct experimental evidence of the occurrence of the weak reaction $\Lambda np\rightarrow nnp$ in nuclei has been obtained by the FINUDA experiment. Three events have been found that can be attributed to $^{7}_{\Lambda}$Li and $^{9}_{\Lambda}$Be two nucleon-induced non mesonic weak decays. The kinematic analysis of such events is presented here.
We report on the first two experiments of hypernuclear γ-ray spectroscopy with Hyperball, a large... more We report on the first two experiments of hypernuclear γ-ray spectroscopy with Hyperball, a large-acceptance germanium detector system. In a KEK experiment, we observed two γ transitions in Λ 7 Li, the spin- flip M1(3/2+ → 1/2+) at 691.7 ± 0.6 stat ± 1.0 sys keV and the E2(5/2+ → 1/2+) at 2050.4 ± 0.4 stat ± 0.7 sys keV. The former gives unambiguous information on the strength of the ΛN spin-spin interaction. B(E2) of the latter transition was measured to be \( 3.6 \pm {0.5^{stat}}\,_{ - 0.4}^{ + 0.5}{\,^{sys}}{e^2}f{m^4} \). In the second experiment at BNL, we observed the E2(5/2+, 3/2+ → 1/2+) transitions of Λ 9 Be at around 3.05 MeV.
We report on the two hypernuclear gamma-ray spectroscopy experiments with a germanium detector sy... more We report on the two hypernuclear gamma-ray spectroscopy experiments with a germanium detector system (Hyperball) which is recently constructed. In the first experiment at KEK, we observed two gamma transitions in 7Lambda Li, the E2(5/2+ --> 1/2 +) transition at 2050 ± 2 keV and the spin-flip M1(3/2+ --> 1/2+) transition at 689 ± 4 keV (preliminary). This is the
Novel data from the [Formula: see text] absorption reaction in light nuclei are presented. The da... more Novel data from the [Formula: see text] absorption reaction in light nuclei are presented. The data were collected by the FINUDA spectrometer running at the DAΦNE ϕ-facility, Laboratori Nazionali di Frascati (LNF), Italy.
The FINUDA experiment has performed a systematic study of the NonMesonic Weak Decay (NMWD) of Λ h... more The FINUDA experiment has performed a systematic study of the NonMesonic Weak Decay (NMWD) of Λ 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 [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are the subject of this paper.
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Papers by Haruhiko Outa