Wed·Jun 25, 2025Wednesday·June 25, 2025

1. 01*

   Deuteron-induced reactions on natural Zr from threshold to 50 MeV: production of ${}^{86}$Y

   E. M. Martinsen · A. S. Voyles · K. C. W. Li🇿🇦 · M. S. Basunia · L. A. Bernstein · H. L. O. Ekeberg · M. Hussain🇵🇰 · J. T. Morrell · S. M. Qaim · S. Siem🇳🇴 · M. S. Uddin · H. Zaneb

   Two stacks of thin Zr foils were irradiated with 30 and 50 MeV deuterons, respectively, using the Lawrence Berkeley National Laboratory $88$-Inch Cyclotron, to investigate this production pathway for the promising PET tracer ${}^{86}$Y. Nineteen excitation functions for ${}^{\text{nat}}$Zr($d$,$x$) reactions were measured over a beam energy range of $6.3$--$47.64$ MeV, where the independent cross sections for ${}^{\text{nat}}$Zr($d$,$x$)${}^{88}$Nb and ${}^{\text{nat}}$Zr($d$,$x$)${}^{86\text{m, g}}$Y were measured for the first time. The well-characterized ${}^{\text{nat}}$Fe($d$,$x$)${}^{56}$Co, ${}^{\text{nat}}$Ni($d$,$x$)${}^{56}$Co, ${}^{\text{nat}}$Ni($d$,$x$)${}^{58}$Co, ${}^{\text{nat}}$Ni($d$,$x$)${}^{61}$Cu, ${}^{\text{nat}}$Ti($d$,$x$)${}^{46}$Sc and ${}^{\text{nat}}$Ti($d$,$x$)${}^{48}$V monitor reactions were used to determine the deuteron beam current throughout the stacks. All cross sections were determined using High Purity Germanium (HPGe) detector $\gamma$-ray spectroscopy. A variance minimization technique was employed to simultaneously constrain the deuteron beam currents with multiple monitor reactions, thus reducing systematic uncertainties. An additional $16$ channels are reported for reactions on the nickel, titanium, and iron monitor foils, leading to a total of $35$ excitation functions, with $7$ reaction channels reported for the first time in this work. The measured excitation functions are compared to calculations provided by the reaction modeling codes $\text{textsc}TALYS-2.0$, $\text{textsc}ALICE-2020$, $\text{textsc}CoH-\mathrm{3.5.3}$ and $\text{textsc}EMPIRE-\mathrm{3.2.3}$, as well as the $\text{textsc}TENDL-2023$ data library. The degree of agreement between theory and experiments is discussed. The physical yields for ${}^{\text{nat}}$Zr($d$,$x$)${}^{86}$Y and other yttrium isotopes produced are calculated and compared to other production pathways.

   nucl-exRadiochim.Acta(2026)·0 citations
2. 02*

   Making the $\mu$OST of the Muon Collider

   Henry T. Klest🇺🇸

   The Muon Collider, recently highlighted as Recommendation 1 in the U.S. National Academies report on Elementary Particle Physics, offers a unique opportunity for fixed-target experiments with high energy and luminosity. This paper outlines some of the challenges and possibilities for fixed-target experiments to study the multi-dimensional structure of hadrons at the Muon Collider. We present a sketch of an experiment making use of the high-energy muon beam from the Muon Collider that could serve as the next-generation hadronic physics experiment after the Electron-Ion Collider.

   nucl-exhep-exhep-phphysics.ins-detPRD(2025)·3 citations
3. 03*

   Probing jet-medium interactions via jet substructure observables in relativistic heavy-ion collisions

   Xiang-Pan Duan🇨🇳 · Tan Luo🇨🇳 · Guo-Liang Ma🇨🇳

   We present a comprehensive study of jet substructure observables in $pp$ and PbPb collisions at $\sqrt{s_{NN}}=5.02$~TeV using a multi-phase transport model. To suppress background contamination, the constituent subtraction method is employed for both PbPb and smeared $pp$ events. The jet splitting momentum fraction ($z_g$) and the groomed jet mass to the ungroomed jet transverse momentum ($M_g/p_{T,\text{jet}}$) are reconstructed using the Soft Drop algorithm with two grooming parameter settings. With $z_{\text{cut}}=0.1$ and $\beta =0.0$, a slight modification in the $z_g$ distribution is observed in central PbPb collisions, whereas a pronounced enhancement in the high $M_g/p_{T,\text{jet}}$ region is found, particularly at low $p_{T,\text{jet}}$ and in more central events. A detailed analysis of the dynamical evolution stages reveals that this enhancement primarily originates from jet-medium interactions, whereas the contributions from hadronization and hadronic rescatterings are largely mitigated by the grooming procedure. In contrast, under a stronger grooming condition ($z_{\text{cut}}=0.5$, $\beta =1.5$), no significant changes in $M_g/p_{T,\text{jet}}$ are observed, indicating that the medium-induced modifications are predominantly associated with large-angle scattering.

   ↳ nucl-thhep-exhep-phnucl-exNucl.Sci.Tech.(2026)·3 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.