“None of this would have been possible without my colleagues and the outstanding research opportunities offered at GSI,” Geissel says. “I’m especially grateful to our former Director, Professor Paul Kienle, who recently passed away. Professor Kienle was the one who made it possible to construct the fragment separator FRS and establish the associated research program. Until just a short time ago, he also played an active role in many experiments, especially those involving the coupling with the storage ring.” Geissel is a professor at Justus Liebig University Giessen. He also directs the research conducted with the GSI fragment separator, which was used to measure most of the newly discovered nuclides. In addition, Geissel is playing a major role in the planning process for the super fragment separator to be installed at the new accelerator facility FAIR. “The Super-FRS at FAIR will enable us to produce many new nuclides and measure their properties in a very short time,” says Geissel. “We are confident that we can improve on the world record with FAIR. We strive hard to complete the facility and make it available for our international research community.”
“The decisive factor in the discovery of a new nuclide is the publication of the measured mass and charge,” says Michael Thoennessen, whose "Discovery of Isotopes Project" compiles statistics on the history of nuclide discoveries. “When a scientist has experimentally determined these two values, we consider the discovery to have been proved, and we then add his or her name to the list.” Working together with his students, Thoennessen has summarized the discoverers of all nuclides by person and by laboratory on the basis of scientific publications. Professor Marek Pfützner of the University of Warzsaw, who is also heavily involved in GSI experiments, occupies second place on the list of persons. Gottfried Münzenberg, who was a professor at Johannes Gutenberg University Mainz and a researcher at GSI, is now third. The list of the top 25 nuclide discoverers includes 22 who have carried out research at GSI. The latest results of Geissel and his colleagues were published in 2012 in the scientific journal Physics Letters B.
"Hans Geissel is an outstanding pioneer in the hunt for new nuclides produced in stellar explosions in our cosmos. He has greatly increased our understanding of 'life and death' of stars with his measurements conducted at GSI", says Professor Karlheinz Langanke, director of research at GSI and theoretical physicist at the University of Darmstadt.
All of the matter of our earth is made of atoms. All atoms with the same electric charge in their nuclei are classified as being nuclei of the same chemical element. To date, we know of 114 such chemical elements. Each element comes in different types known as isotopes, whose atomic nuclei have the same electrical charge but different masses. The discovery of a new nuclide is thus also the discovery of a new isotope. Researchers have observed more than 3,000 different isotopes, and another thousand as yet unknown ones are forecast to exist.
Scientists are particularly interested in very heavy isotopes of an element. Such isotopes play a major role in our understanding of how the elements are created in stars and in stellar explosions. However, due to their short lifetimes, they do not occur naturally on earth. That's why scientists attempt to create them artificially in the laboratory. They do this by accelerating atomic nuclei and colliding them with different materials. New isotopes occur as fragments from the collisions. The fragments can then be sorted and studied using the fragment separator at GSI.
Dr. Ingo Peter | idw
Significantly more productivity in USP lasers
06.12.2016 | Fraunhofer-Institut für Lasertechnik ILT
Shape matters when light meets atom
05.12.2016 | Centre for Quantum Technologies at the National University of Singapore
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.
The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...
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