FIZIKA B 8 (1999) 1, 127-134

FEW-BODY PHYSICS WITH REAL PHOTONS AT TAGX

KOICHI MARUYAMA

Center for Nuclear Study, University of Tokyo, Midoricho, Tanashi,
Tokyo 188-0002, Japan
Email: maruyama@tanashi.kek.jp

Received 22 April 1999; Accepted 12 July 1999

The proton-neutron (pn) pairs in light nuclei such as ³He, ⁴He, and ⁶Li have been investigated with the photon beam from the 1.3-GeV Tokyo Electron Synchrotron. Photodisintegration of the nuclei has been measured in the D-resonance region with the large-acceptance spectrometer TAGX. The strengths of the photon absorption by the pn-pairs vary depending on nuclei and on the photon energy. The pair in ³He is found to be three-times more active than the deuteron in absorbing the photon. The photon absorption cross sections by the pn-pairs in ⁴He show a jump at the pion-production threshold. The total cross sections for five ⁴He-breakup channels including new data are illustrated.

PACS numbers: 25.20.Lj; 25.10.+s; 25.20.Dc; 27.10.+h
UDC 539.126, 539.128

Keywords: photodisintegration, photon absorption, ³He, ⁴He, pn-pair, D-resonance

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