Synopsis: Pushing toward better nuclear data

Dense plasmas created by lasers used for inertial confinement fusion research have been used to extract precise basic nuclear physics data.

Researchers probe many important nuclear reactions using collisions produced with accelerators. Gleaning good data on some fundamental reactions can be problematic, however. For example, low-energy cross sections often need to be extrapolated from high-energy measurements. In those and other cases, nuclear physics research benefits from an enlarged toolkit for measurement of basic cross-section data.

Writing in Physical Review Letters, Johan Frenje at the Massachusetts Institute of Technology, Cambridge, and colleagues report their use of data obtained in laser-driven inertial confinement fusion experiments to extract precise cross sections for important light-ion interactions in which neutrons scatter off deuterons ($2$H) and tritons ($3$H).

The research team created high-density plasmas by using the OMEGA laser system to implode glass capsules filled with deuterium and tritium. Sixty powerful laser beams strike the outer surface of the capsule, generating a plasma that then pushes it inward to compress the gas. As the gas reaches thermonuclear conditions, reactions create $14.1\phantom{\rule{0.333em}{0ex}}\text{MeV}$ neutrons that collide with the hydrogen isotopes, and scattering cross sections are extracted from the energy spectra of these species. The results match ab initio calculations well, providing not only a boost to theory but also data on reactions of crucial importance to nuclear astrophysics and fusion energy research. – David Voss

More Features »

Previous Synopsis

Atomic and Molecular Physics

Next Synopsis

Particles and Fields

Related Articles

Gravitation

Synopsis: Restricting the Fifth Force

Observations of the orbits of two stars at the center of the Milky Way constrain gravitational models involving a hypothetical fifth force. Read More »

Astrophysics

Synopsis: Blocking out Starlight

A proposed telescope update could enable incoming light from multiple stars to be simultaneously blocked, making it easier to image exoplanets orbiting two or more stars. Read More »

Astrophysics

Viewpoint: 3D View of a Comet’s Neighborhood

Detailed 3D simulations of a comet’s environment reveal the rich dynamics of ions and electrons observed by the Rosetta spacecraft around comet 67P. Read More »