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The wealth of Coulomb excitation data collected using present day experimental technique allows model independent determination of most E2 and E3 matrix elements connecting low-lying collective nuclear levels populated by electromagnetic excitation. A semiclassical coupled-channel Coulomb excitation least-squares search code, GOSIA, has been developed to analyze the large sets of experimental data required to unambiguously determine the many electromagnetic matrix elements involved in heavy-ion induced Coulomb excitation. Up to 999 electromagnetic matrix elements, coupling up to 100 levels, can be fitted to reproduce simultaneously several thousand data from up to 50 independent experiments. Fast semi-analytic approximation of the coupled-channels system of differential equations describing electromagnetic excitation is used to achieve computational speed required for such a task. Evaluation of rotational invariants using the measured E2 matrix elements derived using GOSIA determines the intrinsic frame quadrupole shape parameters for low-lying states. The completeness and extent of such electromagnetic structure information adds a new dimension to the study of collectivity in nuclei.
This Gosia users website is designed to provide the potential user with the information and codes to facilitate use of the GOSIA suite of codes for Coulomb excitation studies. The above links provide access to a library of Gosia source codes, sample inputs and outputs, the User Manual, reports, newsletters, as well as links to resources of potential use to the members of the Gosia Users Group. Registration to the Gosia Users Group is available via the above link to the User Group webpage.
Page created and maintained by Webmaster. Last updated 27 April 2011.