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Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model

We derive general analytical expressions for the evaluation of the intrinsic asymmetry parameter in nonmesonic hypernuclear weak decay, within an independent particle shell model framework. Present formalism is valid for even-even, even-odd and odd-odd core hypernucleus. A standard strangeness-changing weak transition potential with exchange of the complete meson octet (π,η,K,ρ,ω,K∗) is assumed...

Microscopic approach to the proton asymmetry in the nonmesonic weak decay of hypernuclei

E. Bauer,1 G. Garbarino,2 A. Parreño,3 and A. Ramos3 1Departamento de Fı́sica, Universidad Nacional de La Plata, C.C. 67, and IFLP, CONICET, La Plata, Argentina 2Dipartimento di Fisica Teorica, Università di Torino and INFN, Sezione di Torino, I-10125 Torino, Italy 3Departament d’Estructura i Constituents de la Matèria, Universitat de Barcelona, E-08028 Barcelona, Spain (Received 21 December 201...

The Nonmesonic Weak Decay of Hypernuclei

Nonmesonic weak decay of the hypertriton.

J. Golak, K. Miyagawa, H. Kamada, H. Witała, W. Glöckle, A. Parreño, A. Ramos, and C. Bennhold Institut für Theoretische Physik II, Ruhr Universität Bochum, D-44780 Bochum, Germany Institut of Physics, Jagellonian University, PL 30059 Cracow, Poland Department of Applied Physics, Okayama University of Science, Ridai-cho Okayama 700, Japan Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerla...

Models of the Nonmesonic Weak Decay

I review the current status of understanding the mechanism of the nonmesonic weak decays (NMWD) of hypernuclei. Long standing problem on the Γnn/Γpn ratio has been solved by considering short-range weak interactions properly. This leaves a few remaining problems, such as the asymmetry of the emitted proton with respect to the Λ polarization and validity of the ∆I = 1/2 in the nonmesonic weak de...