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Energy-Dependent phase-shift analysis of π4He elastic scattering and the existence of π4He excited states

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Il Nuovo Cimento A (1965-1970)

Summary

In the (24÷260) MeV kinetic-energy interval, the energy-dependent phase-shift analysis of π4He elastic scattering is done. The energy dependence is given by the rational-fraction approximants of the partialS-matrix. The search for the stableS-matrix zero-pole pairs in thek and √s complex plane gives some proof for the existence of the π4He excited states in theS, P and, probably,D partial waves.

Riassunto

È stata fatta un'analisi in fase dipendente dall'energia della diffusione elastica π4He nell'intervallo (24÷260) MeV. La dipendenza energetica è data dagli approssimnati di Padé a frazione razionale della matrice parzialeS. La ricerca di coppie di poli e zeri stabili della matriceS nel piano complessok e √s dà alcune prove dell'esistenza di stati eccitati π4He nelle onde parzialiS, P e probabilmenteD.

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Authors and Affiliations

  1. Institute for Physics and Nuclear Engineering, POB MG-6, Bucharest, Romania

    F. Nichitiu

  2. Joint Institute for Nuclear Research, Dubna, URSS

    I. V. Falomkin, M. G. Sapozhnikov & Yu. A. Shcherbakov

  3. Istituto di Fisica Generale dell'Università, Torino, Italia

    G. Piragino

  4. Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Italia

    G. Piragino

Authors
  1. F. Nichitiu
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  2. I. V. Falomkin
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  3. M. G. Sapozhnikov
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  4. Yu. A. Shcherbakov
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  5. G. Piragino
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Nichitiu, F., Falomkin, I.V., Sapozhnikov, M.G. et al. Energy-Dependent phase-shift analysis of π4He elastic scattering and the existence of π4He excited states. Nuov Cim A 67, 1–18 (1982). https://doi.org/10.1007/BF02902427

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  • DOI: https://doi.org/10.1007/BF02902427

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