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The preservation of nuclear spin alignment in plasmas is a prerequisite forimportant applications, such as energy production through polarized fusion orthe acceleration of polarized particle beams. Although this conservationproperty has been the basis of numerous theoretical papers, it has never beenexperimentally confirmed. Here, we report on first experimental data from apolarized $^3\mkern-2mu$He target heated by a PW laser pulse, showing evidencefor persistence of the nuclear polarization after acceleration to MeV energies.The finding also validates the concept of using pre-polarized targets forexperiments at high-power laser facilities.

Preservation of $^3\mkern-2mu$He ion polarization after laser-plasma acceleration