کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9851160 1527286 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Non-mesonic weak decay of Λ-hypernuclei: a new determination of the Γn/Γp ratio
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Non-mesonic weak decay of Λ-hypernuclei: a new determination of the Γn/Γp ratio
چکیده انگلیسی
Theoretical descriptions of the non-mesonic weak decay of Λ-hypernuclei are unable to reproduce the experimental values of the ratio Γn/Γp≡Γ(Λn→nn)/Γ(Λp→np). In this contribution we discuss a new approach to this problem. We have incorporated a one-meson-exchange model for the ΛN→nN transition in finite nuclei in an intranuclear cascade code for the calculation of double-coincidence nucleon distributions corresponding to the non-mesonic decay of 5ΛHe and 12ΛC. The two-nucleon induced decay mechanism, Λnp→nnp, has been taken into account within a local density approximation scheme using a one-pion-exchange model supplemented by short range correlations. A weak decay model independent analysis of preliminary KEK coincidence data for 5ΛHe allows us to extract Γn/Γp=0.39±0.11 when the two-nucleon induced channel is neglected (i.e., Γ2=0) and Γn/Γp=0.26±0.11 when Γ2/Γ1=0.2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics A - Volume 754, 30 May 2005, Pages 137-143
نویسندگان
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