Effekte höherer Ordnung in der elektromagnetischen Dissoziation schwach gebundener Kerne
Effekte höherer Ordnung in der elektromagnetischen Dissoziation schwach gebundener Kerne
The present work deals with the dissociation mechanisms of loosely bound nuclei in heavy ion collisions, a subject which is closely related to current experimentsat heavy ion colliders (RIKEN, GSI, GANIL, MSU-NSCL etc). Our study is based on the avalaible data on the photodissociation of $^{11}$Be,...
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Personal Name(s): | Kalassa Munongo, D. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
1996
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Physical Description: |
107 p. |
Document Type: |
Report Book |
Research Program: |
ohne Topic |
Series Title: |
Berichte des Forschungszentrums Jülich
3168 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
The present work deals with the dissociation mechanisms of loosely bound nuclei in heavy ion collisions, a subject which is closely related to current experimentsat heavy ion colliders (RIKEN, GSI, GANIL, MSU-NSCL etc). Our study is based on the avalaible data on the photodissociation of $^{11}$Be, $^{9}$Be, $^{11}$Li, and the neutron capture by $^{13}$C. Generalising the effective range treatment of photo-nuclear reactions near threshold to describe reactions involving also bound states with a non-zero angular momentum, we derive general expressions for electromagnetic and diffraction dissociation matrix elements and cross-sections, which appear in good approximation to be independent of any assumption on the shape of the nuclear interaction. We have also calculated the mean square distance of loosely bound clusters to the core. Corrections can be worked out in a systematic way. Our mainly analytical calculations are in good agreement with the experimental data and with the previously available numerical results. We have studied the effects of higher order electromagnetic interactions in the Coulomb dissociation of $^{11}$Li and $^{9}$Be in the sudden approximation and we have found a trend to the reduction of the dissociation prob ability. Higher order effects introduce also an asymmetry in the angular distribution of the emitted particles. We have finally studied the time evolution of the final state wave function after a Coulomb dissociation. |