Pocket resonances in low-energy antineutron reactions with nuclei

Lee T., BAYRAK O., Wong C.

PHYSICS LETTERS B, cilt.817, 2021 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 817
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.physletb.2021.136301
  • Dergi Adı: PHYSICS LETTERS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, zbMATH, Directory of Open Access Journals
  • Anahtar Kelimeler: Resonances, Antineutron annihilations, Low energy potential scattering, ANNIHILATION CROSS-SECTION, ANTIPROTON ANNIHILATION, OSCILLATIONS, STABILITY
  • Akdeniz Üniversitesi Adresli: Evet

Özet

Upon investigating whether the antineutron-nucleus annihilation cross-sections at very low momenta psatisfy Bethe-Landau's power law of sigma(ann)(p) proportional to 1/p(alpha), we uncover unexpected regular oscillatory structures in the low antineutron energy region from 0.001 to 10 MeV, with small amplitudes and narrow periodicity in the logarithm of the antineutron energies, for large-A nuclei such as Pb and Ag. Subsequent semiclassical analyses of the Smatrices reveal that these oscillations are pocket resonances that arise from quasi-bound states inside the effective potential pocket with a barrier. They are a continuation of the bound states in the continuum. Experimental observations of these pocket resonances will provide vital information on the properties of the optical model potentials and the nature of the antinucleonnucleus reactions. (C) 2021 The Authors. Published by Elsevier B.V.