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The non-mesonic to π- mesonic decay ratio and Λ-neutron stimulation fraction for p-shell hypernuclei

par Montwill, Alexander;Moriarty, P.;Davis, Dudley;Pniewski, T.;Sobczak, T.;Adamović, O.;Krecker, U.;Coremans, Ghislaine ;Sacton, Jean
Référence Nuclear physics. A, 234, 2, page (413-428)
Publication Publié, 1974-12

Article révisé par les pairs

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Résumé :

Kinematic analysis of simple hypernuclear production reactions has produced a sample of hypernuclei of ΛB, ΛC and ΛN with negligible background, and a much smaller sample of ΛBe. The values of the non-mesonic to π- mesonic ratio Q- for the above samples are 5.5 ± 0.5 and 4.3 ± 1.1, respectively. A sub-sample of 11ΛB hypernuclei was separated on the basis of production via an excited state of Λ12C, giving Q- = 4.8 ± 1.1 for Λ11B. Assuming the Fermi gas model is applicable to nuclei of mass A ≈ 11, two independent means of analysis of the non-mesonic decays give values for the Λ-neutron stimulation fraction n of 0.41 ± 0.09 and 0.34 ± 0.07 for hypernuclei of charge 5 ≦ Z ≦ 7. © 1974.