Quasifree photoabsorption on neutron-proton pairs in 3He

Details Quasifree photoabsorption on neutron-proton pairs in 3He Quasifree photoabsorption on neutron-proton pairs in 3He

1994-06-14

arxiv.org/abs/nucl-th/9406017v1

Nucl.Phys. A586 (1995) 693-710

Physics

Nuclear Physics

Nuclear Theory

23 pages, report MKPH-T-94-10/HU-TFT-94-18

Scientific paper

10.1016/0375-9474(95)00037-2

Three-body photodisintegration of 3He is calculated in the photon energy range 200 - 400 MeV assuming quasifree absorption on np pairs both in initial quasideuteron and singlet configurations. The model includes the normal nucleonic current, explicit meson exchange currents and the Delta(1232)-isobar excitation. The total cross section is increased by a factor of about 1.5 compared with free deuteron photodisintegration. Well below and above the Delta region also some spin observables differ significantly from the ones of free deuteron disintegration due to the more compressed wave function of the correlated np pairs in 3He compared to the deuteron. The initial singlet state causes a significant change in the analyzing power Ay. These differences could presumably be seen at the conjugate angles where two-body effects are maximized and where photoreactions could complement similar pion absorption experiments. Figures by fax or post from janiskanen@phcu.helsinki.fi

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