A step-like rise in the4He(γ, pn)2H cross section near the pion-production threshold

K. Maruyama, K. Niki, Y. Sumi, T. Emura, I. Endo, S. Endo, H. Itoh, S. Kato, M. Koike, K. Maeda, T. Maki, Y. Murata, C. Rangacharyulu, A. Sasaki, T. Suda, Y. Wada, K. Yoshida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A kinematically complete4He(γ, pn)2H measurement was carried out in the photon energy (Eγ) range 145-425 MeV. The total cross section (σα) forms a prominent structure whose peak lies at Eγ ∼ 245 MeV (the pnd invariant mass of 3960 MeV/c2). The ratio σαd, where σdis the deuteron photodisintegration cross section, shows a step-like rise to a value of 6 at Eγ∼ 140 MeV.

Original languageEnglish
Pages (from-to)295-300
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - 1997 Feb 13


  • He
  • Photodisintegration
  • Photon absorption
  • Step-like rise
  • pn pair
  • Δ resonance

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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