A huge, predicted atomic parity violation has now been observed in ytterbium, further aiding tabletop experimental searches for physics beyond the standard model that complement ongoing efforts at high-energy colliders.
Experiments show that spherical and nonspherical states of a light nucleus near neutron number 28 coexist at the same energy, challenging the usefulness of the notion of stable and persistent “magic numbers.”
Dam T. Son,
Physics2, 5 (2009) – Published January 20, 2009
The critical point is one of the main features of the phase diagram of strongly interacting quark-gluon matter. Finding this critical point in the lab will require luck and an understanding of the possible experimental signatures.
The report of a successful experiment at the new radioactive ion trap at RIKEN paves the way for future measurements of more exotic nuclei, and tests some of the key methods needed to build future rare-isotope accelerators.
Various models in nuclear physics can be used to fit the masses of known nuclei, but the predictions tend to be inconsistent for masses that have not been measured. A thorough study examines this problem and provides a route to quantify these errors.
The long-held belief that nuclear states of very heavy elements that carry a large angular momentum would be unstable has been shattered in recent years. Now, a new experiment that can probe the outermost nuclear orbitals in 250Fm studies these states and poses a challenge to theory.
Heavy nuclei formed by fusion reactions often decay rapidly by fissioning into two fragments. Understanding how these decays occur and over what time scale provides a means to locate the superheavy “island of stability.”
Phys. Rev. Focus22, 4 (2008) – Published July 25, 2008
Theorists predict that collisions can briefly create a beryllium nucleus in which neutrons bind two clumps of particles together the way electrons bind atoms into a molecule–in three very different configurations.
Phys. Rev. Focus22, 3 (2008) – Published July 18, 2008
The mixture of a superconductor and a superfluid–as may occur inside a neutron star–could respond to the star’s magnetic field in ways never seen in earthly superconductors, according to a new theory. The strange material doesn’t fit into the two standard superconducting categories.
When an antiproton is fired into an atomic nucleus, will it live long enough for the nucleus to respond to the attractive strong force between the antiproton and the protons and neutrons? Calculations suggest that it would and predict the experimental signatures of an antiproton annihilating in a locally compressed nucleus.