Models of the Nonmesonic Weak Decay
نویسنده
چکیده
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 decay.
منابع مشابه
A ug 2 00 8 Ground state normalization in the nonmesonic weak decay of 12 Λ C hypernucleus
The nonmesonic weak decay width of 12 Λ C hypernucleus has been evaluated within a nuclear matter formalism, using the local density approximation. In addition to the one-body induced decay (ΛN → nN), it has been also considered the two-body induced decay (ΛNN → nNN). This second decay is originated from ground state correlations, where a renormalization procedure to ensure a ground state norma...
متن کاملNonmesonic Weak Decay of Λ Hypernuclei within a Nuclear Matter Formalism
The nonmesonic weak decay of Λ hypernuclei using nonrelativistic nuclear matter is studied. As the basic building block we use the Polarization Propagator Method developed by Oset and Salcedo. It is shown that the exact calculation of exchange terms is required. Using the Local Density Approximation we evaluate the nonmesonic decay width for 12 Λ C and compare the result with a finite nucleus c...
متن کاملRecent results on the nonmesonic weak decay of hypernuclei within a one - meson - exchange model
Recent results on the nonmesonic weak decay of hypernuclei within a one-meson-exchange model. Abstract We update [1] the results presented in Ref. [2] for the nonmesonic decay (NMD) of 12 Λ C and 5 Λ He. We pay special attention to the role played by Final State Intreractions (FSI) on the decay observables. We follow a One-Meson-Exchange (OME) model which includes the exchange of the π, ρ, K, K...
متن کاملth / 9 81 20 72 v 1 2 5 D ec 1 99 8 Spin observables in the pn → p Λ reaction
The T matrix of the pn → pΛ reaction, which is a strangeness changing weak process, is derived. The explicit formulas of the spin observables are given for s-wave pΛ final states which kinematically corresponds to inverse reaction of the weak nonmesonic decay of Λ hypernuclei. One can study interferences between amplitudes of parity-conserving and violating, spin-singlet and triplet and isospin...
متن کاملNonmesonic Weak Decay of Light Hypernuclei with Coherent Σ Mixing
Nonmesonic weak decays of the A = 4, and 5 hypernuclei are studied. The short range parts of the hyperon-nucleon weak interactions are described by the direct quark (DQ) weak transition potential, while the longer range interactions are given by the π and K meson exchange processes. Virtual Σ mixings of the coherent type are found to give significant effects on the decay rates of 4ΛHe. A large ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004