A key process that enhances the production of nuclear energy in the interior of dense stars has been re-created in the laboratory for the first time by physicists at the National Institute of Standards and Technology (NIST). The work may help scientists study topics such as nuclear fusion as a possible energy source and demonstrates a new method for studying and modeling dense stellar objects such as white dwarfs.
This false color image shows an ultracold plasma of 26,000 beryllium ions fluorescing when hit by a laser pulse.
The NIST experiments, described in the Jan. 18 issue of Physical Review Letters,* involve temperature measurements of ultracold crystals as they melt. First, a "plasma" of tens of thousands of singly charged beryllium atoms is trapped using electric and magnetic fields and then cooled to almost absolute zero using lasers. When the lasers are turned off, the plasma begins to heat up. At 10 milliKelvin---just 0.01 degree above absolute zero---the temperature suddenly rises more than 10 billion times faster than predicted by theory. This burst of energy in a very cold system of highly interactive particles is believed to mimic events occurring inside the hot, dense interiors of stars, where plasmas of highly charged atoms undergo accelerated nuclear reactions.
Beryllium ions are frequently used in NIST research on topics such as development of future atomic clocks and quantum computing studies. Such rapid heating was first noticed in experiments attempting to prepare special states of beryllium ions that can improve the precision of an atomic clock.
Laura Ost | EurekAlert!
First Juno science results supported by University of Leicester's Jupiter 'forecast'
26.05.2017 | University of Leicester
Measured for the first time: Direction of light waves changed by quantum effect
24.05.2017 | Vienna University of Technology
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy