Pi-Mesonic Weak Decay Rates of Light-to-Heavy Hypernuclei

Motoba, T.; Itonaga, K.

doi:10.1143/ptps.117.477

Cited by 36 publications

(104 citation statements)

References 30 publications

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“…2, both calculations of Refs. [20,21] (full (green) squares) and Ref. [22] [7], compared with previous measurements (full (black) triangles) [16][17][18][19]14] and with theoretical calculations [20,21] (full (green) squares) and [22] (full (blue) stars).…”

Section: Measurement Of γ π − /γ λmentioning

confidence: 79%

“…total decay rates for the other set of ground state spin-parity calculated in Refs. [20][21][22] 15 Λ N, for which the calculated values reported in Ref. [21] do not allow to fix the ground state spin-parity.…”

Section: Measurement Of γ π − /γ λmentioning

confidence: 99%

“…Indeed, the calculations of Refs. [20,21] evaluate the p-shell hypernuclei total and partial MWD decay rates by incorporating the pion final state interaction by pion-nuclear distorted waves and by describing the structure of the nuclear core with the Cohen-Kurath spectroscopic approach [23]. The authors found that for p-shell hypernuclei the total π − decay rate is dominated by Λ 1s → p 1p transitions, while only little contributions are given by higher energy configurations of the final nuclear system, mainly through Λ 1s → p 2s,1d transitions.…”

Section: Measurement Of γ π − /γ λmentioning

confidence: 99%

“…[21,20,22], allowing to determine the spin-parity configuration of the hypernucleus ground state. In Fig.…”

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confidence: 99%

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Hypernuclear weak decay studies with FINUDA

et al. 2012

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The FINUDA experiment has recently completed an extensive study of the weak decay of p-shell Λ-hypernuclei including both mesonic and non-mesonic modes. Charged mesonic decay rates have been determined based on the analysis of π − kinetic energy spectra, never measured before. The study of proton spectra from non-mesonic weak decay for p-shell hypernuclei, both single and in coincidence with a neutron, has triggered the investigation of the two-nucleon induced ΛN N → nN N decay channel: its weight has been evaluated to be Γ 2 /Γ NM = 0.21 ± 0.07 stat +0.03 sys −0.02 sys . Finally, a direct experimental evidence of the occurrence of the weak reaction Λnp → nnp in nuclei is presented for the first time. Three events have been found which can be attributed to 7 Λ Li and 9 Λ Be two-nucleon induced non-mesonic weak decay; the kinematical analysis is discussed here.

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Section: Measurement Of γ π − /γ λmentioning

confidence: 79%

Section: Measurement Of γ π − /γ λmentioning

confidence: 99%

Section: Measurement Of γ π − /γ λmentioning

confidence: 99%

“…[21,20,22], allowing to determine the spin-parity configuration of the hypernucleus ground state. In Fig.…”

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confidence: 99%

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Hypernuclear weak decay studies with FINUDA

et al. 2012

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“…The reduction of the mesonic decay width in hypernuclei by several orders of magnitudes as A increases is due to limiting the sum to unoccupied nucleon states. In realistic calculations, however, the final-state nuclear interaction of the emitted pion plays a significant role, providing enhancement of the decay rate in heavy hypernuclei by one to two orders of magnitude over what a plane-wave impulse approximation calculation (using φ free π (r; q)) would give (Oset and Salcedo, 1985;Itonaga, Motoba, and Bandō, 1988;Nieves and Oset, 1993;Motoba and Itonaga, 1994).…”

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confidence: 99%