Mon·Dec 19, 2022Monday·December 19, 2022

1. 01*

   Highlights from the PHENIX experiment

   Sanghoon Lim

   PHENIX has performed an extensive study on the evolution of medium effects from small to large systems. PHENIX has continued searching for Quark-Gluon Plasma (QGP) in small systems by measuring collectivity, modification of light hadron and quarkonia production, and jet substructure. In large systems, detailed studies on the property of the QGP have been done using direct photon, ${\pi }^0$-hadron correlation, heavy-flavor electron, and $J/\psi$ flow with a large statistics of data collected in 2014. This report covers new results from the PHENIX experiment in various collision systems.

   nucl-exnucl-thActa Phys.Polon.Supp.(2023)·0 citations
2. 02*

   Muon capture on the deuteron in chiral effective field theory

   Jose Bonilla🇺🇸 · Bijaya Acharya🇺🇸 · Lucas Platter🇺🇸

   We consider the capture of a muon on a deuteron. An uncertainty analysis of the dominant channels is important for a careful analysis of forthcoming experimental data. We quantify the theoretical uncertainties of chiral effective-field-theory predictions of the muon-deuteron capture rate from the relevant neutron-neutron partial wave channels in the final state. We study the dependence on the cutoff used to regularize the interactions, low-energy constants calibrated using different fitting data and strategies, and truncation of the effective-field-theory expansion of the currents. Combining these approaches gives as an estimate of ${\Gamma }_{\mu d}^{1/2}=399.1\pm 7.6\pm 4.4$ s${}^{-1}$ for capture from the atomic doublet state, and ${\Gamma }_{\mu d}^{3/2}=12.31\pm 0.47\pm 0.04$ s${}^{-1}$ for capture from the quartet state.

   ↳ nucl-thnucl-exPRC(2023)·4 citations
3. 03*

   Ab initio in-medium similarity renormalization group for open-shell atomic systems

   G. Tenkila · V. Chand · T. Miyagi🇨🇦 · H. Patel🇺🇸 · S. R. Stroberg🇺🇸 · R. F. Garcia Ruiz🇺🇸 · J. D. Holt🇨🇦

   Precise theoretical calculations of open-shell atomic systems are critical for extracting fundamental physics parameters from precision experiments. Here we present proof-of-principle calculations illustrating the effectiveness of the valence-space formulation of the ab initio in-medium similarity renormalization group, widely used in nuclear theory, as a new ab initio method for atomic systems. We adapt this approach to study properties of closed- and open-shell many-electron systems from helium to calcium. Ground-state energies, excitation spectra, and ionization energies are obtained for selected atoms, and reasonable agreement is found with benchmark coupled-cluster and many-body perturbation theory calculations, where available.

   ↳ physics.atom-phnucl-exnucl-th2 citations
4. 04*

   Scalable Organic Semiconductor Neutron Detectors

   Joanna Borowiec · Fani Eirini Taifakou · Muhammad Ali🇲🇾 · Chris Allwork · Adrian J. Bevan🇬🇧 · Theo Kreouzis · Cozmin Timis

   A long-standing limitation of semiconductor neutron detectors is the lack of a scalable solution to make large area instruments. Neutron detectors are used in a wide range of applications, including the nuclear industry, safeguarding radioactive material, neutron imaging, non-destructive testing, understanding space weather effects on commercial electronics used in aviation, and for fundamental science such as nuclear and particle physics. Here we demonstrate that a solution processed organic semiconductor technology, which is scalable, can solve this aproblem. We have demonstrated detection of fast neutrons from monoenergetic beams (energies 0.565 and 16.5 MeV), from AmBe sources, and thermal energy (0.025 eV) in devices sensitised with B-10 enriched B_4C. This energy range is of interest for many of the applications listed above. The detector response is found to be linear with flux up to 1.5 x 10^7 n/cm^2/s. As organic semiconductors are a similar density to human tissue, this technology may be of interest for medical physics applications, for example B neutron capture therapy dose monitoring and understanding neutron interactions in human tissue.

   ↳ physics.ins-dethep-exnucl-ex1 citation

* 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.