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U.S. Department of Energy Office of Science

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A photon is absorbed by the ground state of helium-4. This excites the transition to the first excited state of helium-4, which sits just above the energy threshold for separation into a proton and a hydrogen-3 nucleus.

Exciting the Alpha Particle

New calculations confirm recent experimental results on the transition between the alpha particle and its first excited state.

The floating block method pictured as ice blocks and the sea. The method applies a filtering process called imaginary time evolution to two Hamiltonians, represented by ice and sea. It gives the overlap between the two Hamiltonians’ lowest energy states.

Computing How Quantum States Overlap

The floating block method provides the tools to compute how quantum states overlap and how to build fast and accurate emulators of those systems.