Wed·Jan 18, 2023Wednesday·January 18, 2023

1. 01*

   Measurement of the ${}^{236}$U fission cross section and angular distributions of fragments from fission of ${}^{235}$U and ${}^{236}$U in the neutron energy range of 0.3-500 MeV

   A. S. Vorobyev · A. M. Gagarski · O. A. Shcherbakov · L. A. Vaishnene · A. L. Barabanov · T. E. Kuz'mina

   The ${}^{236}$U fission cross section and the angular distributions of fragments from fission of ${}^{235}$U and ${}^{236}$U were measured for incident neutron energies from 0.3 MeV to 500 MeV on the time-of-flight spectrometer of the neutron complex GNEIS at the NRC "Kurchatov Institute" -- PNPI. Fission fragments were registered using position-sensitive low-pressure multiwire counters. In the neutron energy range above 20 MeV, the angular distributions of ${}^{236}$U fission fragments were measured for the first time. The fission cross section of ${}^{236}$U$(n,f)$ was measured relative to the fission cross section of ${}^{235}$U$(n,f)$, which is an accepted international standard. The obtained data are compared with the results of other experimental works. Theoretical calculations of the fission cross section and the anisotropy of angular distribution of fission fragments for the ${}^{236}$U$(n,f)$ reaction performed within the framework of our approach are presented and discussed.

   nucl-exnucl-thPRC(2023)·6 citations
2. 02*

   Report of the 2021 U.S. Community Study on the Future of Particle Physics (Snowmass 2021) Summary Chapter

   Joel N. Butler (1)🇺🇸 · R. Sekhar Chivukula (2)🇺🇸 · André de Gouvêa (3)🇺🇸 · Tao Han (4)🇺🇸 · Young-Kee Kim (5)🇺🇸 · Priscilla Cushman (6)🇺🇸 · Glennys R. Farrar (7)🇺🇸 · Yury G. Kolomensky (8)🇺🇸 · Sergei Nagaitsev (1)🇺🇸 · Nicolás Yunes (9)🇺🇸 · Stephen Gourlay (10)🇺🇸 · Tor Raubenheimer (11)🇺🇸 and 31 other authors

   The 2021-22 High-Energy Physics Community Planning Exercise (a.k.a. ``Snowmass 2021'') was organized by the Division of Particles and Fields of the American Physical Society. Snowmass 2021 was a scientific study that provided an opportunity for the entire U.S. particle physics community, along with its international partners, to identify the most important scientific questions in High Energy Physics for the following decade, with an eye to the decade after that, and the experiments, facilities, infrastructure, and R&D needed to pursue them. This Snowmass summary report synthesizes the lessons learned and the main conclusions of the Community Planning Exercise as a whole and presents a community-informed synopsis of U.S. particle physics at the beginning of 2023. This document, along with the Snowmass reports from the various subfields, will provide input to the 2023 Particle Physics Project Prioritization Panel (P5) subpanel of the U.S. High-Energy Physics Advisory Panel (HEPAP), and will help to guide and inform the activity of the U.S. particle physics community during the next decade and beyond.

   ↳ hep-exhep-lathep-phhep-th+130 citations
3. 03*

   Simulation studies related to the particle identification by the forward and backward RICH detectors at Electron Ion Collider

   D.S.Bhattacharya🇮🇹 · E.Cisbani🇮🇹 · C. Chatterjee🇮🇹 · S. Dalla Torre🇮🇹 · C. Dilks🇺🇸 · A. Kiselev🇺🇸 · H.Klest🇺🇸 · R. Preghenella🇮🇹 · A. Vossen🇺🇸

   The Electron-Ion collider (EIC) will be the ultimate facility to study the dynamics played by the colored quarks and gluons to the emergence of the global phenomenology of the nucleons and nuclei as described by Quantum Chromodynamics. The physics programs will greatly rely on efficient particle identification (PID) in both the forward and the backward regions. The forward and the backward RICHes of the EIC have to be able to cover wide acceptance and momentum ranges; in the forward region a dual radiator RICH (dRICH) is foreseen and in the backward region a proximity-focusing RICH can be foreseen to be employed. The geometry and the performance studies of the dRICH have been performed as prescribed in the EIC Yellow Report using the ATHENA software framework. This part of our work reports the effort following the call for EIC detector proposal the studies related to the forward and the backward RICHes performance. In the forward region, dRICH performance showed a pion-kaon separation from around 1 GeV/c to 50 GeV/c at a three sigma level; the proximity focusing RICH (pfRICH) foreseen for the backward region can reach three sigma separation up to 3 GeV/c for e/$\pi$ and up to 10 GeV/c for $\pi$/K mass hypothesis.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2023)·4 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.