Results 1 - 10 of 7049
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[en] The physics of the weak decay of hypernuclei is briefly reviewed from a theoretical point of view. Special regard is devoted to the recent progress concerning the determination of the non-mesonic decay widths and the asymmetry parameters. Convincing evidence has been achieved for a solution of the long-standing puzzle on the ratio Γn/Γp. Very recently, it has been shown that the exchange of a ππ pair in the weak mechanism plays a crucial role in explaining the discrepancies between theory and experiment on the decay asymmetries
[en] The review of experimental measurements of neutron lifetime is presented. Latest measurements with gravitational trap (PNPI NRC KI) and magnetic trap (LANL, USA) confirmed the result obtained by PNPI group in 2005. The results of measurements performed using UCN storing method are in good agreement; however there is a significant discrepancy at 3.5σ (1% of decay probability) level with beam method experiment. That discrepancy is mentioned in scientific literature as "neutron anomaly". The possible sources of the discrepancy are discussed. (paper)
[en] The experimental results published before May 2021 from the various reaction and decay studies leading to nuclides of Z=59 to Z=75, 160Pr, 160Nd, 160Pm, 160Sm, 160Eu, 160Gd, 160Tb, 160Dy, 160Ho, 160Er, 160Tm, 160Yb, 160Lu, 160Hf, 160Ta, 160W, 160Re in the A=160 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties. This work is intended to supersede the previous evaluation of the A=160 nuclides by C.W.Reich (2005Re18), which was published in Nuclear Data Sheets 105, 557 (2005).
[en] The FINUDA experiment has performed a systematic study of mesonic weak decay of p-shell Λ-hypernuclei. Recent results on the mesonic decay spectra and ratios are illustrated and discussed. (author)
[en] An updated limit on the mντ has been derived from 295,000 η decays observed in the ALEPH detector at LEP between 1991 and 1994. The result is obtained from a maximum likelihood fit in the hadronic total energy vs hadronic invariant mass plane for a sample of selected 5π(π0) candidates consisting of 39 τ → 5πντ and 3 τ → 5ππ0ντ. A comparison of the invariant mass spectrum with 5π phase space and a a1 + 2π model favors the latter τ decay mechanism. The τ neutrino mass limit of 23.1 MeV at 95 % confidence level is slightly more restrictive that the published value. (author)