Parity violating magnetization at neutrino pair emission using trivalent lanthanoid ions

Hideaki Hara, Akihiro Yoshimi, Motohiko Yoshimura

Research output: Contribution to journalArticlepeer-review


A new detection method using magnetization generated at triggered radiative emission of neutrino pairs, |e→|g+γ+-ijνiν¯j (which is the atomic deexcitation from state |e to state |g while emitting the sum of neutrino pairs -ijνiν¯j accompanied by a photon γ), is investigated in order to determine unknown neutrino properties: the absolute neutrino masses of νi and Majorana/Dirac distinction. Magnetization associated with radiative emission of neutrino pair events has a parity violating component intrinsic to weak interaction enforced by the crystal field effect in solids, and greatly helps background rejection of QED origin even when these backgrounds are amplified. In proposed experiments we prepare a coherently excited body of trivalent lanthanoid ions, Er3+ (a best candidate ion so far found), doped in a transparent dielectric crystal. The magnetic moment μS→·k→/k arising from generated electron spin S→ parallel to trigger photon direction k→/k is parity odd, and is absent in QED processes. The generated magnetic field of order nano-Gauss is stored in crystals long after pair emission event till spin relaxation time. An improved calculation method of coherent rate and angular distribution of magnetization is developed in order to incorporate finite size effect of crystal target beyond the infinite size limit in previous calculations.

Original languageEnglish
Article number115006
JournalPhysical Review D
Issue number11
Publication statusPublished - Dec 1 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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