Fri·Sep 29, 2023Friday·September 29, 2023

1. 01*

   Experimental investigation of the effect of ionization on the 51V(p,n)51Cr reaction

   V. Lelasseux · P.-A. Söderström · S. Aogaki · K. Burdonov · S. Chen · A. Cvetinovic · E. Dechefdebien · S. Dorard · A. Fazzini · L. Gremillet · M. Gugiu · V. Horny and 6 other authors

   The investigation of the effects of average atomic ionization on nuclear reactions is of prime importance for nuclear astrophysics. No direct experimental measurement using a plasma target has been done yet. In this regard, we measured for the first time the neutron production of a (p,n) reaction in different states of ionization. The studied nuclear reaction was 51V(p,n)51Cr. We measured a significantly lower neutron production than expected when the target was ionized, even when taking into account existing electron screening theory or the effect of the stopping power in the target on the injected proton beam. This experiment is a first step in the process to characterize the influence of ionization at astrophysically relevant energies.

   nucl-exPhys.Plasmas(2026)·0 citations
2. 02*

   Results on Elastic Cross Sections in Proton-Proton Collisions at $\sqrt{s}=510$ GeV with the STAR Detector at RHIC

   STAR Collaboration: M. I. Abdulhamid · B. E. Aboona · J. Adam · L. Adamczyk · J. R. Adams · I. Aggarwal · M. M. Aggarwal · Z. Ahammed · E. C. Aschenauer · S. Aslam · J. Atchison · V. Bairathi and 355 other authors

   We report results on an elastic cross section measurement in proton-proton collisions at a center-of-mass energy $\sqrt{s}=510$ GeV, obtained with the Roman Pot setup of the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The elastic differential cross section is measured in the four-momentum transfer squared range $0.23\le -t\le 0.67$ GeV${}^2$. We find that a constant slope $B$ does not fit the data in the aforementioned $t$ range, and we obtain a much better fit using a second-order polynomial for $B(t)$. The $t$ dependence of $B$ is determined using six subintervals of $t$ in the STAR measured $t$ range, and is in good agreement with the phenomenological models. The measured elastic differential cross section $\mathrm{d}\sigma /\mathrm{dt}$ agrees well with the results obtained at $\sqrt{s}=546$ GeV for proton--antiproton collisions by the UA4 experiment. We also determine that the integrated elastic cross section within the STAR $t$-range is ${\sigma }_{\mathrm{el}}^{\mathrm{fid}}=462.1\pm 0.9(stat.)\pm 1.1(syst.)\pm 11.6(\mathrm{scale})$~$\mu \mathrm{b}$.

   ↳ hep-exnucl-exPLB(2024)·6 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.