Fri·Jul 30, 2021Friday·July 30, 2021

1. 01*

   New results on proton-induced reactions on Vanadium for ${}^{47}$Sc production and the impact of level densities on theoretical cross sections

   F. Barbaro🇮🇹 · L. Canton🇮🇹 · M.P. Carante🇮🇹 · A. Colombi🇮🇹 · L. De Dominicis🇮🇹 · A. Fontana🇮🇹 · F. Haddad🇫🇷 · L. Mou🇮🇹 · G. Pupillo🇮🇹

   New data for the ${}^{\text{mbox}}nat$V(p,x) reactions have been measured in the range 26-70 MeV, with production of the nuclides ${}^{47}$Sc, ${}^{43}$Sc, ${}^{44m}$Sc, ${}^{44g}$Sc, ${}^{46}$Sc, ${}^{48}$Sc, ${}^{42}$K, ${}^{43}$K, ${}^{48}$V, ${}^{48}$Cr, ${}^{49}$Cr, and ${}^{51}$Cr. The focus is on the production of ${}^{47}$Sc, a ${\beta }^{-}$-emitter suitable for innovative radiotheranostic applications in nuclear medicine. The measured cross sections for this radionuclide and its contaminants are compared with the theoretical excitation functions calculated with the TALYS code. In view of novel radiopharmaceutical applications, it is essential to accurately describe these cross-sections for the evaluation of yields, purities, and dose releases. Hence, we optimize the level-density parameters of the microscopic models in the TALYS code to obtain the best possible descriptions of the new data. We consider different irradiation conditions to estimate the production yields from the cross sections determined in this work.

   nucl-exnucl-thphysics.med-phPRC(2021)·8 citations
2. 02*

   Longitudinal double helicity asymmetry $A_{LL}$ from direct photon, jet and charged pion production in polarized $\vec{p}+\vec{p}$ collisions

   Zhongling Ji🇺🇸

   Understanding the proton spin composition from the quarks and gluons spin polarization and their motion is important to test various kinds of sum rules and nonperturbative properties of hadrons. At the Relativistic Heavy Ion Collider (RHIC), we collide longitudinally polarized proton beams and measure the double helicity asymmetry $A_{LL}$, which is an important physical quantity for extracting the polarized parton distribution functions (PDFs) of the proton. Direct photon, jet and charged pion production are good channels to probe the gluon spin polarization inside the proton, with the ability to probe also the sign of the gluon spin. Direct photon production is the theoretically ``cleanest'' channel, with little fragmentation contribution, but limited by statistics. On the other hand, jet and charged pion production have more statistics, but include more hard processes and hadronization effects. I will present the recent measurements of direct photon, jet and charged pion $A_{LL}$s at PHENIX and show their complementary roles in extracting the gluon spin.

   nucl-exhep-phSciPost Phys.Proc.(2022)·1 citation
3. 03*

   NLO collinear factorization of large mass diphoton photoproduction amplitude

   Oskar Grocholski🇵🇱 · Bernard Pire🇫🇷 · Paweł Sznajder🇵🇱 · Lech Szymanowski🇵🇱 · Jakub Wagner🇵🇱

   We calculate large mass diphoton exclusive photoproduction in the framework of collinear QCD factorization at next to leading order in {\alpha}s and at leading twist. Collinear divergences of the coefficient function are absorbed by the evolution of the generalized parton distributions (GPDs). This result enlarges the existing factorization proofs to 2 -> 3 processes, opening new reactions to a trustable extraction of GPDs.

   ↳ hep-phhep-exnucl-exSciPost Phys.Proc.(2022)·0 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.