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1 edition of The non-mesonic decay of helium hypernuclei. found in the catalog.

The non-mesonic decay of helium hypernuclei.

The non-mesonic decay of helium hypernuclei.

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Published by Presses académiques européennes in Bruxelles .
Written in English

    Subjects:
  • Helium -- Isotopes -- Decay.

  • Edition Notes

    Bibliography: leaves 7-8.

    Statement[By] G(hislaine) Coremans [and others]
    SeriesUniversité libre de Bruxelles. Faculté des sciences appliquées. Institut de physique. Service de physique nucléaire. Physique des particules élémentaires. Bulletin no. 35
    ContributionsCoremans, Ghislaine.
    Classifications
    LC ClassificationsQC770.B7 A27 no. 35
    The Physical Object
    Pagination11 l.
    Number of Pages11
    ID Numbers
    Open LibraryOL5001737M
    LC Control Number76508542

    The isotopic composition refers to that in air. Helium-2 (diproton) Helium-2 or 2 He is an extremely unstable isotope of helium. Its nucleus, a diproton, consists of two protons with no ing to theoretical calculations, it would have been much more stable (although still undergoing β + decay to deuterium) if the strong force had been 2% greater. A dedicated and systematic experimental study made possible the achievement of some new results about the non-mesonic weak decay of hypernuclei. Among others, the first determination of the one-proton induced non-mesonic weak decay width for several p -shell Λ-hypernuclei contributed in defining a coherent picture of the complete set of decay.

      Hypernuclei were discovered in by M. Danysz and J. Pniewski in photographic emulsions that went with high altitude balloon flights. The weak decay of a Λ nucleon accounted for the abundant energy release in a secondary star, which is the signature of what was called a hyperfragment. Many surprises were offered by hypernuclei through a large variety of experiments over a long period . Abstract. This paper summarizes the available information on S-shell hypernuclei, particularly with respect to their weak decays. It is also pointed out that a measurement of the branching ratios in the non-mesonic weak decay of Λ 4 H is crucial in order to test the ΔI=1/2 rule in the strangeness changing non-leptonic weak decay process. We emphasize that collectively, the S-shell.

    The quenching of nucleon yields in the nonmesonic weak decay of Λ-hypernuclei and the three-body weak decay process H. Bhang, S. Ajimura, K. Aoki, A. Banu, T. Fukuda, O. Hashimoto et . Summary. The helium bubble chamber was exposed to a stopping K-beam and 4 He Λ hypernuclei, produced in the reaction K-+ 4 He→ →π-+ 4 He Λ, were probability forp-wave emission in the decay Λ 0 →n + π 0 was deduced to be p 0 2 (p 0 2 +s 0 2) = 0.l6±, from the ratio of the decay modes 4 He Λ → all π 0 and 4 He inΛ → all result is in good agreement.


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The non-mesonic decay of helium hypernuclei Download PDF EPUB FB2

The analysis is reported of a sample of hypernuclei decaying non-mesonically with the emission of one or two charged particles which were obtained from K − meson captures at rest in nuclear emulsion. Making use of the decay parameters established for the 4 Λ He hypernucleus from observations in a helium bubble chamber, a value of Q −, the ratio of non-mesonic to π − mesonic Cited by: The analysis is reported of a sample of hypernuclei decaying non-mesonically with the emission of one or two charged particles which were obtained from K - meson captures at rest in nuclear emulsion.

Making use of the decay parameters established for the 4 Λ He hypernucleus from observations in a helium bubble chamber, a value of Q- the ratio of non-mesonic to π. The non-mesonic decay modes of Λ hypernuclei are examined.

The one-nucleon induced decay (ΛN → NN) is studied in a shell-model framework using a meson Author: A. Ramos, C. Bennhold, E. Oset, L.L. Salcedo, M.J.

Vicente-Vacas. DI-fusion, le Dépôt institutionnel numérique de l'ULB, est l'outil de référencementde la production scientifique de l'ULB.L'interface de recherche DI-fusion permet de consulter les publications des chercheurs de l'ULB et les thèses qui y ont été by:   For the first time the hypothetical 3 He-η bound state was searched for in non-mesonic p d → 3 He 2 γ and p d → The non-mesonic decay of helium hypernuclei.

book He 6 γ decays. For the purpose of the experimental data interpretation, a new theoretical model for the η-mesic helium was developed, according to which the mesic nucleus decays without η meson by: 2.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Theoretical descriptions of the non–mesonic weak decay of Λ–hypernuclei are unable to reproduce the experimental values of the ratio Γn/Γp ≡ Γ(Λn → nn)/Γ(Λp → np).

In this contribution we discuss a new approach to this problem. We have incorporated a one–meson–exchange model for the ΛN → nN. We review the current status of studies of weak decays of Λ-hypernuclei. Both experimental and theoretical aspects are reviewed, with emphasis on the weak non-mesonic decays.

Experimental results obtained during the last thirty years are described and discussed in detail. We present an evaluation of the non-mesonic decay widths for Λ-hypernuclei (ΛN→ NN, ΛNN→ NNN) within the framework of the polarization propagator method.

The full Λ self-energy is evaluated microscopically in nuclear matter by using the functional approach, which supplies a theoretically well grounded approximation scheme for the classification of the relevant diagrams, according to.

Weak non-mesonic decay of Hypernuclei W.M. Alberico∗ Dipartimento di Fisica Teorica and INFN, via P. Giuria 1, I Torino, Italy February 8, Abstract We review the mechanism of weak decay of hypernuclei, with em-phasis on the non-mesonic decay channels.

Various theoretical ap. Very sensitive studies hypernuclei are now possible at Brookhaven. The p{lambda} {yields} s{lambda} gamma ray transition in the hypernucleus {lambda}{sup 13}C has been observed in an experiment using sodium iodide detectors.

An experiment to study the formation and decay of {lambda}{lambda} hypernuclei is being prepared. and branching ratios of mesonic as well as nonmesonic decay channels of 12 Λ C, 11 Λ B and the different helium hypernuclei [7,8]. The group at KEK used the (π+,K+) production reaction to not only measure total and partial decay rates [9], but also to use the induced polarization in Notably, the two–body component of the non–mesonic decay rates has not been measured yet, due to the too low counting rates expected for a coincidence experiment.

For the asymmetric non–mesonic decay of polarized hypernuclei the situation is even more puzzling. Indeed, strong inconsistencies appear already among data.

scattering. The mesonic decay of light hypernuclei has provided evidence of the strong repulsion of the ΛNinteraction at short distances, a property that follows naturally from available quark models of the strong YNinteraction.

The non-mesonic decay mode (ΛN → NN) has received much attention and 3. We measured the lifetime and the mesonic and non-mesonic decay rates of the 4He-Lambda hypernucleus. The hypernuclei were created using a MeV/c momentum K. Making use of the decay parameters established for the 4ΛHe hypernucleus from observations in a helium bubble chamber, a value of Q−, the ratio of non-mesonic to π− mesonic decays, for λ5He.

Abstract. The proton decay asymmetry, α p NM, of the polarized Λ-hypernuclei, Λ 5 He, Λ 12 C and Λ 11 B, has been investigated to understand the reaction mechanism of the non-mesonic weak-decay process.

These Λ-hypernuclei were produced in the highest statistics ever via the (π +, K +) reaction at GeV/c by using the SKS spectrometer at KEK 12 GeV PS.

1 Hyperons and hypernuclei Introduction Hyperons (, Ω) have lifetimes of the order of 10 −10 sec (apart from the 0, which decays into γ).They decay weakly, with a mean free path ˇ c˝= O(10 cm).

Ahypernucleus is a boundsystem of neutrons, protonsand oneormore hyperons. The nonmesonic weak decay spectra of light hypernuclei have been evaluated in a systematic way. As theoretical framework we adopt the independent particle shell. By measuring the relative decay widths ({Gamma}{sub n}/{Gamma}{sub p}) in the full set of s-shell hypernuclei, a sensitive test of the {Delta}I = 1/2 rule, and the determination of its applicability to non-mesonic decays can be made.

In addition, information about the spin-isospin dependence of the weak decay process can be extracted. We have studied the mesonic and non-mesonic decay width of Λ-hypernuclei by performing calculations in nuclear matter and using the local-density prescription to apply the results to finite nuclei.

We review recent developments concerning the weak decay of Lambda hypernuclei. New studies covering the mesonic decay channel as well as recent models for [email protected]{osti_, title = {Polarization effects in decays of hypernuclei}, author = {Lyul'ka, V A}, abstractNote = {The polarization of the protons in the hypernucleus decay /sup 5/He/./>./sup 4/He+p+./sup -/ is calculated.

It is shown that the final-state resonance interaction in the p-/sup 4/He system essentially determines the angular dependence of the proton.In Sect. 2 I discuss the possible modes for a hyperon to decay, the mesonic channel (Λ → πN) and the non-mesonic channel (Λ N ⇒ N N), which constitutes the dominant mode when the decay.