Hard breakup of two nucleons from the {sup 3}He nucleus
- Florida International University, Miami, Florida 33199 (United States)
We investigate a large angle photodisintegration of two nucleons from the {sup 3}He nucleus within the framework of the hard rescattering model (HRM). In the HRM a quark of one nucleon knocked out by an incoming photon rescatters with a quark of the other nucleon leading to the production of two nucleons with large relative momentum. Assuming the dominance of the quark-interchange mechanism in a hard nucleon-nucleon scattering, the HRM allows the expression of the amplitude of a two-nucleon breakup reaction through the convolution of photon-quark scattering, NN hard scattering amplitude, and nuclear spectral function, which can be calculated using a nonrelativistic {sup 3}He wave function. The photon-quark scattering amplitude can be explicitly calculated in the high energy regime, whereas for NN scattering one uses the fit of the available experimental data. The HRM predicts several specific features for the hard breakup reaction. First, the cross section will approximately scale as s{sup -11}. Second, the s{sup 11} weighted cross section will have the shape of energy dependence similar to that of s{sup 10} weighted NN elastic scattering cross section. Also one predicts an enhancement of the pp breakup relative to the pn breakup cross section as compared to the results from low energy kinematics. Another result is the prediction of different spectator momentum dependencies of pp and pn breakup cross sections. This is due to the fact that the same-helicity pp-component is strongly suppressed in the ground state wave function of {sup 3}He. Because of this suppression the HRM predicts significantly different asymmetries for the cross section of polarization transfer NN breakup reactions for circularly polarized photons. For the pp breakup this asymmetry is predicted to be zero while for the pn it is close to (2/3)
- OSTI ID:
- 21290003
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 80, Issue 1; Other Information: DOI: 10.1103/PhysRevC.80.014612; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASYMMETRY
BREAKUP REACTIONS
CROSS SECTIONS
ELASTIC SCATTERING
ENERGY DEPENDENCE
FORECASTING
GROUND STATES
HELICITY
HELIUM 3
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PHOTONS
PHOTONUCLEAR REACTIONS
POLARIZATION
QUARKS
RESCATTERING
SCATTERING AMPLITUDES
SPECTRAL FUNCTIONS
WAVE FUNCTIONS