1 / 24

Erzeugung exotischer Atomkerne

Erzeugung exotischer Atomkerne. Krebsnebel. Supernova beobachtet 1054. Der Ursprung der Elemente. Nukleosynthese nach dem Urknall. Kernfusion in Sternen. Neutroneneinfang in Roten Riesensternen oder Supernovae. Geburt und Tod der Sterne. Zwiebelschalenstruktur kurz vor Explosion.

marci
Télécharger la présentation

Erzeugung exotischer Atomkerne

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Erzeugung exotischer Atomkerne

  2. Krebsnebel Supernova beobachtet 1054 Der Ursprung der Elemente Nukleosynthese nach dem Urknall Kernfusion in Sternen Neutroneneinfang in Roten Riesensternen oder Supernovae

  3. Geburt und Tod der Sterne Zwiebelschalenstruktur kurz vor Explosion 8M M  15M Supernova II 1.4M Mcore 2M Neutronen Stern M 15M Supernova IIa M  2M Schwarzes Loch M  8M Roten Riese Weiβer Zwerg

  4. Fusion in Sternen Der Ursprung der Elemente number of protons Nucleosynthese in Supernova-Explosionen: Schneller Neutroneneinfang durch instabile (neutronenreiche) Isotope number of neutrons

  5. Reaktionsmechanismen zur Erzeugung radioaktiver Strahlen Protonen-indizierte Reaktionen Schwerionen-induzierte Reaktionen

  6. Fragmentation im Fluge Ionen-Separation on-line „ISOL“

  7. Zwei moderne Methoden zur Erzeugung und Untersuchung seltener Isotope Gestoppte und wiederbeschleunigte Ionen „Ionen Separation Online (ISOL): Fragmentation „im Fluge“ (IF): Relativistische Schwerionenstrahlen Intensive Protonenstrahlen Heißes, dickes Target: Targetfragmentation Dünnes Target: Projektilfragmentation Ionenquelle ms - s Fragmentseparator Massenseparator geringer Auflösung s Ionenkühlung Speicherring Ionenfallen

  8. Konzepte für ISOL

  9. ISOLDE (CERN) Strahl aus dem PS Booster: Verbund aus 4 kleinen Synchrotrons liefert 1 GeV Protonen, 3.21013/s (alle 1.2 s) Some of the targets used at ISOLDE consist of molten metals kept at temperatures from 700o C and up to about 1400o C. Such targets are characterized by a relatively long release time of the produced isotopes and a typical time constant of the release is about 30 seconds. Faster release times, in the order of one second or less, can be obtained, if target material in the form of refractory metal powder, metals or carbides is used at temperatures above 2000o C. An expected decrease in the release time due to the "shock-wave" effect of the pulsed proton beam has been observed. Time constants down to some tenths of a second can be reached for the fastest targets. Oberflächen-Ionenquelle

  10. Separatoren an ISOLDE (CERN) The second separator, the High Resolution Separator (HRS), is equipped with two bending C-magnets with bending angles 90° and 60° degrees, respectively. At the moment one single mass, with a resolution of about M/M=5.000, can be separated routinely with the HRS separator. The calculated beam profiles for the masses 99, 100 and 101 are shown in the figure. It will be possible to achieve a maximal resolution of more than 30.000. The ISOLDE PS-Booster facility is equipped with two isotope separators. The General Purpose Separator (GPS) is designed to allow three beams, within a mass range of ± 15%, to be selected and delivered to the experimental hall. The magnet is double focussing H-magnet with a bending angle of 70° and a mean bending radius of 1.5 m. The mass resolving power is M/M=2400.

  11. Konzepte für Separation im Fluge

  12. Erzeugung hochgeladener Isotope an der GSI

  13. Beispiel: 78Ni

  14. Br - DE - Br Separation Method

  15. Reichweite und Energieverlust geladener Teilchen in Materie nach Bethe-Bloch

  16. Der Fragmentseparator der GSI

  17. GSI: Kombination von relativistischen Ionenstrahlen, Fragmentseparator und Speicherring (oder Neutronendetektor)

More Related