An international team of researchers has made the world’s most precise measurement of the neutron’s lifetime, which may help answer questions about the early universe.
An international team of physicists led by researchers at Indiana University Bloomington has announced the world’s most precise measurement of the neutron’s lifetime. The results from the team, which encompasses scientists from over 10 national labs and universities in the United States and abroad, represent a more than two-fold improvement over previous measurements — with an uncertainty of less than one-tenth of a percent. The work is reported in the Oct 13 issue of the journal Physical Review Letters. It was also the subject of a live news briefing at the 2021 Fall Meeting of the American Physical Society Division of Nuclear Physics.
“This work sets a new gold-standard for a measurement that has fundamental importance to such questions as the relative abundances of the elements created in the early universe,” said David Baxter, chair of the IU Bloomington College of Arts and Sciences’ Department of Physics. “We’re proud of IU’s long-time role as a leading institution on this work.” IU-affiliated authors at the time of the study were graduate students Nathan Callahan, Maria Dawid and Francisco Gonzalez; engineer Walt Fox; Rudy Professor of Physics Chen-Yu Liu; research scientist Daniel Salvat; and mechanical technician John Vanderwerp. (Callahan and Gonzalez are currently affiliated with Argonne National Laboratory and Oak Ridge National Laboratory, respectively.) The research was conducted at Los Alamos National Laboratory. The scientific purpose of the experiment is to measure how long, on average, a free neutron lives outside the confines of atomic nuclei. Read more...
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