The Λ(1405)N → YN transition in the nuclear medium for non-mesonic absorption of a in nuclei

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• 作者：T. Sekihara ; D. Jido ; Y. Kanada-En'yo
• 关键词：Non-mesonic decay ; kaonic nuclei ; &#x39b ; (1405) doorway ; Chiral unitary approach
• 刊名：Nuclear Physics A
• 出版年：2010
• 出版时间：1 April 2010
• 年：2010
• 卷：835
• 期：1-4
• 页码：390-393
• 全文大小：197 K

文摘

The non-mesonic transition Λ(1405)N→YN is investigated as one of the essential processes for the non-mesonic absorption of a in nuclei. Using a one-meson exchange model in the calculation of the transition, we find that the non-mesonic transition ratio Γ_ΛN/Γ_ΣN depends strongly on the ratio of the Λ(1405) (Λ^*) couplings to and πΣ. Especially, a larger Λ^*- coupling leads to enhancement of the transition to ΛN. Using the chiral unitary model for the description of the Λ^*, we obtain Γ_ΛN/Γ_Σ⁰N≈1.2 which is almost independent of the nucleon density, and find the total non-mesonic decay width of the Λ^* in uniform nuclear matter to be 22MeV at the normal density.