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Title: | Nucleon-Nucleon Coincidence Spectra in the Nonmesonic Weak Decay of Λ Hypernuclei and the Γn/Γp Puzzle |
Author: | Garbarino, G. Parreño García, Assumpta Ramos Gómez, Àngels |
Keywords: | Mesons (Física nuclear) Experiments Mesons (Nuclear physics) Experiments |
Issue Date: | 12-Sep-2003 |
Publisher: | American Physical Society |
Abstract: | By combining a one-meson-exchange model for the Λ N → n N transition in finite nuclei with an intranuclear cascade code, we have obtained nucleon-nucleon (angular and energy) coincidence distributions from the nonmesonic weak decay of 5 Λ H e and 12 Λ C hypernuclei. Although, due to the elimination of interferences, two-nucleon coincidences are expected to give a cleaner extraction (with respect to single nucleon observables) of the ratio Γ n / Γ p ≡ Γ ( Λ n → n n ) / Γ ( Λ p → n p ) , we show that the effect of the final state interactions is still important even when applying favorable energy and angular cuts. The agreement of our results for the ratio N n n / N n p between the number of n n and n p emitted pairs with preliminary KEK coincidence data allows us to conclude that Γ n / Γ p for 5 Λ H e should be small and close to the value of 0.46 predicted by our meson-exchange model. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.91.112501 |
It is part of: | Physical Review Letters, 2003, vol. 91, num. 11, p. 112501 |
URI: | http://hdl.handle.net/2445/141662 |
Related resource: | https://doi.org/10.1103/PhysRevLett.91.112501 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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