Ge Zhuang, Bai Shiwei, Eronen Tommi, Jokinen Ari, Kankainen Anu, Kujanpää Sonja, Moore Iain, Nesterenko Dmitrii, Reponen Mikael
Department of Physics, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland.
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871 China.
Eur Phys J A Hadron Nucl. 2024;60(7):147. doi: 10.1140/epja/s10050-024-01359-7. Epub 2024 Jul 15.
The absolute mass of 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 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 was refined to be from high-precision cyclotron-frequency-ratio measurements with a relative precision of . 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 ( ) decay value of was directly determined to be 1790.115(37) keV, and the precision was improved by a factor of 30.
使用JYFLTRAP双彭宁阱质谱仪的相成像离子回旋共振技术测定了[具体元素]的绝对质量。通过对Sr原子跃迁频率进行高精度同位素位移测量，获得更精确的[具体元素]质量对于提供超出标准模型的物理潜在指示至关重要。通过相对精度为[具体精度值]的高精度回旋频率比测量，将[具体元素]的质量过剩值精确到[具体数值]。获得的质量过剩值与《2020年原子质量评估》中采用的值一致，但精度提高了30倍。基于这个新值，我们证实了先前在锶同位素位移研究中观察到的非线性。此外，直接确定了[具体元素]的双β（[具体符号]）衰变值为1790.115(37)keV，精度提高了30倍。
