Direct observation of the superallowed α-decay of ¹⁰⁴Te

We would like to extend our gratitude to the entire RIBF operations team. Also, we would like to thank T. Papenbrock and K. L. Jones for helpful discussions. The material is based on work supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract nos. DE-FG02-96ER40983 (UTK) and DE-AC05-00OR22725 (ORNL), the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344 and the Polish National Science Center under grant no. 2020/39/B/ST2/02346 and contract no. UMO-2019/33/B/ST2/02908. This work was also sponsored by JSPS KAKENHI grant nos. 25H01273 and 24K0655, the RIKEN programme RiNA-Net, the Stewardship Science Academic Alliances programme through DOE awards no. DE-NA0003899 (UTK), the National Science Foundation NSF-MRI-1919735 (UTK), the Spanish MCIN/AEI/10.13039/501100011033 under grants TED2021-130592B-I00 (PROTOTWIN) and PID2021-126998OB-I00 (FASCINA) and supported by BMBF under Verbundprojekt 05P2021 (ErUM-FSP T07) grant 05P21PKFN1. A.E. was supported by the DFG under grant number JO 391/20-1. A.A. acknowledges support from the Polish National Agency for Academic Exchange (NAWA) under the STER Programme - Internationalisation of Doctoral Schools, project ‘International Doctoral Program at NCBJ & IChTJ’ (project no. BPI/STE/2021/1/00033/U/00001). This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (https://www.energy.gov/doe-public-access-plan).