134 research outputs found
First spatial separation of a heavy ion isomeric beam with a multiple-reflection time-of-flight mass spectrometer
211 Po ions in the ground and isomeric states were produced via 238 U projectile fragmentation at 1000 MeV/u. The 211 Po ions were spatially separated in flight from the primary beam and other reaction products by the fragment separator FRS. The ions were energy-bunched, slowed-down and thermalized in a gas-filled cryogenic stopping cell (CSC). They were then extracted from the CSC and injected into a high-resolution multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). The excitation energy of the isomer and, for the first time, the isomeric-to-ground state ratio were determined from the measured mass spectrum. In the subsequent experimental step, the isomers were spatially separated from the ions in the ground state by an ion deflector and finally collected with a silicon detector for decay spectroscopy. This pioneering experimental result opens up unique perspectives for isomer-resolved studies. With this versatile experimental method new isomers with half-lives longer than a few milliseconds can be discovered and their decay properties can be measured with highest sensitivity and selectivity. These experiments can be extended to studies with isomeric beams in nuclear reactions
Synchronbeobachtungen über Beziehungen physikalisch-chemischer und mikrobiologischer Reaktionen zu Luftdruckänderungen in und bei Braunschweig
Schwankungen der Befallsstärke von Phytophthora infestans (Mont.) de Bary an Tomatenpflanzen im Vergleich mit Änderungen des Luftdrucks
Zwei einfache Modelle meteorobiologischer Reaktionen in ihren Beziehungen zu Luftdruckänderungen und zur Solaraktivität
Beziehungen zwischen Witterungsablauf, physikalisch-chemischen Reaktionen, biologischem Geschehen und Sonnenaktivität : Unter besonderer Berücksichtigung eigener mikrobiologischer Versuchergebnisse
Beobachtungen zur Sternchenbildung bei Kn�llchenbakterien verschiedener Herkunft (Bacterium radicicola Beij. bzw. Rhizobium sp.)
Über Beziehungen zwischen der durch Pseudomonas tabaci (Wolf u. Foster) Stevens hervorgerufenen "Wildfeuer"- Erkrankung des Tabaks, Luftdruckänderungen und Solaraktivität)
- …