Fri·Aug 23, 2024Friday·August 23, 2024

1. 01*

   Radiative Decay of the ${}^{229m}$Th Nuclear Clock Isomer in Different Host Materials

   S.V. Pineda🇧🇪 · P. Chhetri🇧🇪 · S. Bara🇧🇪 · Y. Elskens🇧🇪 · S. Casci🇧🇪 · A.N. Alexandrova🇺🇸 · M. Au🇨🇭 · M. Athanasakis-Kaklamanakis🇨🇭 · M. Bartokos🇦🇹 · K. Beeks🇨🇭 · C. Bernerd🇨🇭 · A. Claessens🇧🇪 and 33 other authors

   A comparative vacuum ultraviolet spectroscopy study conducted at ISOLDE-CERN of the radiative decay of the ${}^{229m}$Th nuclear clock isomer embedded in different host materials is reported. The ratio of the number of radiative decay photons and the number of ${}^{229m}$Th embedded are determined for single crystalline CaF${}_2$, MgF${}_2$, LiSrAlF${}_6$, AlN, and amorphous SiO${}_2$. For the latter two materials, no radiative decay signal was observed and an upper limit of the ratio is reported. The radiative decay wavelength was determined in LiSrAlF${}_6$ and CaF${}_2$, reducing its uncertainty by a factor of 2.5 relative to our previous measurement. This value is in agreement with the recently reported improved values from laser excitation.

   nucl-exPRResearch(2025)·15 citations
2. 02*

   Preservation of the Direct Photon and Neutral Meson Analysis in the PHENIX Experiment at RHIC

   Gabor David🇺🇸 · Maxim Potekhin🇺🇸 · Dmitri Smirnov🇺🇸

   The PHENIX Collaboration has actively pursued a Data and Analysis Preservation program since 2019, the first such dedicated effort at RHIC. A particularly challenging aspect of this endeavor is preservation of complex physics analyses, selected for their scientific importance and the value of the specific techniques developed as a part of the research. For this, we have chosen one of the most impactful PHENIX results, the joint study of direct photons and neutral pions in high-energy d+Au collisions. To ensure reproducibility of this analysis going forward, we partitioned it into self-contained tasks and used a combination of containerization techniques, code management, and robust documentation. We then leveraged REANA (the platform for reproducible analysis developed at CERN) to run the required software. We present our experience based on this example, and outline our future plans for analysis preservation.

   ↳ physics.data-annucl-ex0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.