| DATE: |
2007-05-25 14:30 - 16:00 |
| PLACE: |
3F meeting room, Building C, Tandem Accelerator Center |
| TITLE: |
The 17th Tsukuba Seminar on Unstable Nuclei, |
| CONTACT: |
ozawa tac.tsukuba.ac.jp |
| SPEAKER: |
Prof. Hans Geissel (GSI, Germany) |
| LANGUAGE: |
English |
| ABSTRACT: |
An introduction into the modern physics with rare (short-lived, exotic) nuclear beams will be presented. Short-lived, bare and few-electron ions of all elements can now for the first time been investigated in the laboratory. Besides the basic interest in understanding of nuclear matter in our environment, highly charged radioactive ions exist in hot stellar plasmas the sites where the
nucleosynthesis happens. Exotic nuclei have been produced and investigated in a large energy region, from the Coulomb barrier up to 90 % light velocity. Basic questions on the existence of atoms with
unusual proton-to-neutron are motivations for this scientific effort. At relativistic velocities the exotic nuclei are bare and thus provide unique possibilities to measure their fundamental ground state properties in a storage ring. We observed that the absence of atomic electrons can change the nuclear decay properties quite significantly and can even open new decay channels like the recently
discovered beta decay into bound states. Precision experiments normally require a small phase space occupation and a long ob-servation time, conditions which are extremely difficult to achieve with rare
isotopes. Special cooling techniques in storage rings and ion-optical measures solve these problems.
New results from such precision experiments with stored exotic nuclei at relativistic energies at the FRS-ESR will also be presented in this contribution. |
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