Mesonic and Non-Mesonic Weak Decay of Hypernuclei with FINUDA

Agnello, M.; Andronenkov, A.; Beer, G.; Benussi, L.; Bertani, M.; Bhang, H.; Bonomi, G.; Botta, E.; Bregant, M.; Bressani, T.; Bufalino, S.; Busso, L.; Calvo, D.; Camerini, P.; Dalena, B.; Mori, F. De; D’Erasmo, G.; Fabbri, F.; Feliciello, A.; Filippi, A.; Fiore, E. M.; Fontana, A.; Fujioka, Hiroyuki; Genova, P.; Gianotti, P.; Grion, N.; Hartmann, O.; Kang, B. H.; Lenti, V.; Lucherini, V.; Marcello, S.; Maruta, T.; Mirfakhrai, N.; Montagna, P.; Morra, O.; Nagae, T.; Nakajima, D.; Outa, H.; Pace, E.; Palomba, M.; Pantaleo, A.; Panzarasa, A.; Paticchio, V.; Piano, S.; Pompili, F.; Rui, R.; Lorente, A. Sánchez; Sekimoto, M.; Simonetti, G.; Toyoda, A.; Wheadon, R.; Zenoni, A.

doi:10.1016/j.nuclphysa.2009.05.061

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…The latter ones are due to the different techniques used to evaluate the areas and the background in the inclusive spectra, while the systematic error due to the detection threshold of the apparatus has been estimated to be less than 2% and has been neglected. A preliminary account of the results presented here can be found in [39]. Total decay rates were calculated, using known Γ tot /Γ Λ values or relying on a linear fit to the known values of all measured Λ-hypernuclei in the mass range A = 4 − 12 [32] as shown in Table 3: Γ tot /Γ Λ (A) = (0.990 ± 0.094) + (0.018 ± 0.010) · A, χ 2 /ndf = 5.317/6.…”

Section: Mwd Decay Ratios and Total Decay Ratesmentioning

confidence: 99%

New results on mesonic weak decay of p-shell Λ-hypernuclei

et al. 2009

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The FINUDA experiment performed a systematic study of the charged mesonic weak decay channel of p-shell Λ-hypernuclei. Negatively charged pion spectra from mesonic decay were measured with magnetic analysis for the first time for 7 Λ Li, 9 Λ Be, 11 Λ B and 15 Λ N. 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 Γ π − /Γtot were derived from the measured spectra and converted to π − decay rates Γ π − 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 + for 7 Λ Li and 5/2 + for 11 Λ B ground-state are confirmed and a spin-parity 3/2 + for 15 Λ N ground-state is assigned for the first time.

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Section: Mwd Decay Ratios and Total Decay Ratesmentioning

confidence: 99%

New results on mesonic weak decay of p-shell Λ-hypernuclei

et al. 2009

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Role of near threshold resonances in intermediate energy nuclear physics

Jain

Upadhyay

2014

Pramana - J Phys

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decay rates of p-shell hypernuclei revisited

Gal

2009

Nuclear Physics A

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Explicit expressions for the parity-violating s-wave and the parity-conserving p-wave contributions to π − weak-decay rates of Λ hypernuclei in the 1p shell are given in the weak-coupling limit, to update previous shell-model calculations and to compare with recent π − spectra and total decay rates measured by the FINUDA Collaboration for 7 Λ Li, 9 Λ Be, 11 Λ B and 15 Λ N. A useful sum rule for the summed strength of Λ1s → p1p hypernuclear π − weak decays is derived. Fair agreement between experiment and calculations is reached, using the primary s-wave amplitude and Cohen-Kurath nuclear wavefunctions. The role of the p-wave amplitude is studied in detail for 15 Λ N and found to be secondary. Previous assignments of ground-state spin-parity values J π ( 7 Λ Lig.s.) = 1 2 + and J π ( 11 Λ Bg.s.) = 5 2 + are confirmed, and a new assignment J π ( 15 Λ Ng.s.) = 3 2 + is made, based on the substantial suppression calculated here for the 15 Λ N( 1 2 + ) → π − 15 Og.s. weak decay rate. Key words: mesonic weak decays of hypernuclei, ground-state spins of hypernuclei PACS: 13.30.Eg, 21.80.+a Email address: avragal@vms.huji.ac.il (Avraham Gal).

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Mesonic and Non-Mesonic Weak Decay of Hypernuclei with FINUDA

Cited by 5 publications

References 7 publications

New results on mesonic weak decay of p-shell Λ-hypernuclei

New results on mesonic weak decay of p-shell Λ-hypernuclei

Role of near threshold resonances in intermediate energy nuclear physics

decay rates of p-shell hypernuclei revisited

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