High-precision measurement of the atomic mass of $$^{84}\hbox {Sr}$$ and implications to isotope shift studies

Author:

Ge ZhuangORCID,Bai ShiweiORCID,Eronen TommiORCID,Jokinen AriORCID,Kankainen AnuORCID,Kujanpää SonjaORCID,Moore IainORCID,Nesterenko DmitriiORCID,Reponen MikaelORCID

Abstract

AbstractThe absolute mass of $$^{84}\hbox {Sr}$$ 84 Sr was determined using the phase-imaging ion-cyclotron-resonance technique with the JYFLTRAP double Penning trap mass spectrometer. A more precise value for the mass of $$^{84}\hbox {Sr}$$ 84 Sr is essential for providing potential indications of physics beyond the Standard Model through high-precision isotope shift measurements of Sr atomic transition frequencies. The mass excess of $$^{84}\hbox {Sr}$$ 84 Sr was refined to be $$-80649.229(37) keV/\hbox {c}^2$$ - 80649.229 ( 37 ) k e V / c 2 from high-precision cyclotron-frequency-ratio measurements with a relative precision of $$4.8\times 10^{-10}$$ 4.8 × 10 - 10 . The obtained mass-excess value is in agreement with the adopted value in the Atomic Mass Evaluation 2020, but is 30 times more precise. With this new value, we confirm the previously observed nonlinearity in the study of the isotope shift of strontium. Moreover, the double-beta ($$2\beta ^{+}$$ 2 β + ) decay Q value of $$^{84}\hbox {Sr}$$ 84 Sr was directly determined to be 1790.115(37) keV, and the precision was improved by a factor of 30.

Funder

Research Council of Finland

H2020 European Research Council

Publisher

Springer Science and Business Media LLC

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