αα scattering in halo effective field theory

R. Higa, H. W. Hammer, U. van Kolck

Research output: Contribution to journalArticle

75 Scopus citations

Abstract

We study the two-alpha-particle (αα) system in an Effective Field Theory (EFT) for halo-like systems. We propose a power counting that incorporates the subtle interplay of strong and electromagnetic forces leading to a narrow resonance at an energy of about 0.1 MeV. We investigate the EFT expansion in detail, and compare its results with existing low-energy αα phase shifts and previously determined effective-range parameters. Good description of the data is obtained with a surprising amount of fine-tuning. This scenario can be viewed as an expansion around the limit where, when electromagnetic interactions are turned off, the 8Be ground state is at threshold and exhibits conformal invariance. We also discuss possible extensions to systems with more than two alpha particles.

Original languageEnglish (US)
Pages (from-to)171-188
Number of pages18
JournalNuclear Physics A
Volume809
Issue number3-4
DOIs
StatePublished - Sep 1 2008

Keywords

  • Effective field theory
  • Nuclear clusters

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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