Thu·Oct 3, 2024Thursday·October 3, 2024

1. 01*

   p--$\varphi$ femtoscopic correlation analysis using a dynamical model

   Kenshi Kuroki🇯🇵 · Tetsufumi Hirano🇯🇵

   We analyse the p--$\varphi$ correlation functions in high-multiplicity proton+proton collisions at the LHC using a dynamical model, DCCI2, and discuss the effects of collision dynamics on the p--$\varphi$ femtoscopic study. Collision dynamics, such as collective expansion and hadronic rescatterings, leads to the relative momentum-dependent non-Gaussian source functions. This results in deviations in the correlation functions compared to those using the Gaussian source function adopted in existing studies. Our analysis shows the importance of using the source functions that reflect more realistic collision dynamics for future precision analysis of hadron interactions via femtoscopy.

   ↳ hep-phnucl-exnucl-thEPJ Web Conf.(2025)·2 citations
2. 02*

   ${}^{229}{\mathrm{ThF}}_4$ thin films for solid-state nuclear clocks

   Chuankun Zhang🇺🇸 · Lars von der Wense · Jack F. Doyle🇺🇸 · Jacob S. Higgins🇺🇸 · Tian Ooi🇺🇸 · Hans U. Friebel · Jun Ye🇺🇸 · R. Elwell🇺🇸 · J. E. S. Terhune🇺🇸 · H. W. T. Morgan🇺🇸 · A. N. Alexandrova🇺🇸 · H. B. Tran Tan🇺🇸 · Andrei Derevianko🇺🇸 · Eric R. Hudson🇺🇸

   After nearly fifty years of searching, the vacuum ultraviolet ${}^{229}$Th nuclear isomeric transition has recently been directly laser excited [1,2] and measured with high spectroscopic precision [3]. Nuclear clocks based on this transition are expected to be more robust [4,5] than and may outperform [6,7] current optical atomic clocks. They also promise sensitive tests for new physics beyond the standard model [5,8,9]. In light of these important advances and applications, a dramatic increase in the need for ${}^{229}$Th spectroscopy targets in a variety of platforms is anticipated. However, the growth and handling of high-concentration ${}^{229}$Th-doped crystals [5] used in previous measurements [1-3,10] are challenging due to the scarcity and radioactivity of the ${}^{229}$Th material. Here, we demonstrate a potentially scalable solution to these problems by demonstrating laser excitation of the nuclear transition in ${}^{229}$ThF${}_4$ thin films grown with a physical vapor deposition process, consuming only micrograms of ${}^{229}$Th material. The ${}^{229}$ThF${}_4$ thin films are intrinsically compatible with photonics platforms and nanofabrication tools for integration with laser sources and detectors, paving the way for an integrated and field-deployable solid-state nuclear clock with radioactivity up to three orders of magnitude smaller than typical \thor-doped crystals [1-3,10]. The high nuclear emitter density in ${}^{229}$ThF${}_4$ also potentially enables quantum optics studies in a new regime. Finally, we describe the operation and present the estimation of the performance of a nuclear clock based on a defect-free ThF${}_4$ crystal.

   ↳ physics.atom-phnucl-exphysics.opticsquant-phNature(2024)·37 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.