Polarization of single-particle states involved in heavy ion transfer reactions
If two nuclei could be placed next to each other at a distance typical of grazing collisions, the single-particle states in each would adjust themselves to the presence of the other nucleus. They would develop an appreciable probability of being in the other nucleus, and the more weakly bound the state, the more strongly it would be polarized by the other nucleus. The solution to this situation has been realized in the two-center shell model. Whether such an adjustment can occur during a reaction depends on the ratio of the transit time to the nuclear periods of the more weakly bound nucleons. In typical low-energy experiments this ratio appears to allow for such a polarization. Clearly if it occurs, the form factor for a transfer reaction will be modified from those currently employed, which use the asymptotic single-particle states of the non-interacting separated nuclei. From the foregoing discussion it is expected that (1) for stripping reactions to a sequence of excited states in the target nucleus, the polarization effects will increase with increasing excitation (i.e., decreasing binding), (2) since transfer can take place for larger impact parameters if polarization occurs, the effect on the angular distribution will be a shift to smaller angles compared to normal DWBA, (3) the polarization effect will ultimately vanish at sufficiently high bombarding energy. Calculations so far show that the single particle states of the heavier of the reaction partners suffer the greater polarization. 2 figures.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7184188
- Report Number(s):
- LBL-5008; CONF-760424-10; TRN: 76-017996
- Resource Relation:
- Conference: Symposium on macroscopic features of heavy ion collisions, Argonne, IL, USA, 1 Apr 1976
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAVY ION REACTIONS
TRANSFER REACTIONS
SINGLE-PARTICLE MODES
POLARIZATION
DWBA
FORM FACTORS
SHELL MODELS
WAVE FUNCTIONS
BORN APPROXIMATION
CHARGED-PARTICLE REACTIONS
DIRECT REACTIONS
FUNCTIONS
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
OSCILLATION MODES
PARTICLE PROPERTIES
653003* - Nuclear Theory- Nuclear Reactions & Scattering