A new avenue in the search for CP violation: Mössbauer spectroscopy of 227 Ac

Marcus Scheck*, Robert Chapman, Jacek Dobaczewski, Claude Ederer, Peter Ivanov, Guiseppe Lorusso, David O’Donnell, Christian Schröder

*Corresponding author for this work

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This work proposes a new avenue in the search for CP-violating odd-electric and even-magnetic nuclear moments. A promising candidate to find such moments in the ground state is the quadrupole-deformed and octupole-correlated nucleus 227-actinium. In this nucleus, the 27.4-keV E1 transition that connects the 3 / 2 + parity-doublet partner and the 3 / 2 - ground state is perfectly suited to apply the sensitive technique of recoil-free selfabsorption, commonly known as Mössbauer spectroscopy. In this experimental approach, the lifetime of the 3 / 2 + upper parity-doublet partner allows an estimate of the lower limit of Δ E= 2 · Γ γ = 23.7 (1) × 10 - 9 eV for the achievable energy resolution to be made. This resolution must be exceeded by the interaction of a CP-violating moment and the corresponding multipole moment of the field distribution in the lattice. This work presents the first ideas for patterns caused by CP-violating moments on the expected quadrupole splitting and nuclear Zeeman effect.

Original languageEnglish
Article number116
Number of pages6
JournalEuropean Physical Journal A
Issue number5
Publication statusPublished - 26 May 2023


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