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

TY - JOUR

T1 - A new avenue in the search for CP violation

T2 - Mössbauer spectroscopy of 227Ac

AU - Scheck, Marcus

AU - Chapman, Robert

AU - Dobaczewski, Jacek Jan

AU - Ederer, Claude

AU - Ivanov, Peter

AU - Lorusso, Guiseppe

AU - O’Donnell, David

AU - Schröder, Christian

N1 - This is an author-produced version of the published paper. Uploaded in accordance with the University’s Research Publications and Open Access policy.

PY - 2023/5/26

Y1 - 2023/5/26

N2 - 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 Mossbauer spectroscopy. In this experimental approach, the lifetime of the 3/2+ upper parity-doublet partner allows an estimate of the lower limit of E = 2xGamma = 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.

AB - 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 Mossbauer spectroscopy. In this experimental approach, the lifetime of the 3/2+ upper parity-doublet partner allows an estimate of the lower limit of E = 2xGamma = 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.

U2 - 10.1140/epja/s10050-023-01000-z

DO - 10.1140/epja/s10050-023-01000-z

M3 - Article

SN - 1434-6001

VL - 59

JO - European Physical Journal A : Hadrons and Nuclei

JF - European Physical Journal A : Hadrons and Nuclei

IS - 5

M1 - 116

ER -