Fri·Sep 24, 2021Friday·September 24, 2021

1. 01*

   Measurements of $p$-$\Xi$, $\Lambda$-$\Lambda$, and $\Xi$-$\Xi$ Correlation in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV at RHIC-STAR

   Moe Isshiki (for the STAR Collaboration)🇯🇵

   The hyperon-hyperon and hyperon-nucleon interactions are important in search for exotic hadrons such dibaryon as a bound state of two baryons. $\Lambda$-$\Lambda$ correlation has been measured in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV at RHIC-STAR experiment using high statistics data recently taken, which has been found to clearly show the anti-correlation. The first measurements of p-$\Xi$ and $\Xi$-$\Xi$ correlations in Au+Au collisions have been shown. The p-$\Xi$ correlation function shows the strong attractive interaction, which is consistent with HAL QCD calculation. $\Xi$-$\Xi$ correlation has also been measured to be negative (as anti-correlation).

   nucl-exEPJ Web Conf.(2022)·12 citations
2. 02*

   Anisotropic Flow Measurements of Identified Particles in the STAR Experiment

   Shaowei Lan🇨🇳

   We report results of $v_1$ and $v_2$ for identified hadrons (${\pi }^{\pm },K^{\pm },K_S^0,p,\varphi$ and $\Lambda$) from Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV and $v_2$ for ${\pi }^{\pm },K^{\pm },p$ and $\bar{p}$ at $\sqrt{s_{NN}}$ = 27 and 54.4 GeV using the STAR detector at RHIC. In Au+Au collisions at high energies, one finds that the values of $v_2$ are all positive and the number-of-constituent-quark (NCQ) scaling holds. On the other hand, results from collisions at 3 GeV, the midrapidity $v_2$ is negative for all hadrons and NCQ scaling is absent. In addition, the midrapidity $v_1$ slopes for all hadrons are found to be positive. Furthermore, the features of negative $v_2$ and positive $v_1$ slope at 3 GeV can be reproduced by calculations with baryonic mean-field potential in transport model. These results imply that in 3 GeV Au+Au collisions, the medium is characterized by baryonic interactions.

   nucl-exhep-exPoS(2022)·3 citations
3. 03*

   Results from the Baksan Experiment on Sterile Transitions (BEST)

   V.V. Barinov🇷🇺 · B.T. Cleveland🇨🇦 · S.N. Danshin🇨🇭 · H. Ejiri🇯🇵 · S.R. Elliott🇺🇸 · D. Frekers🇩🇪 · V.N. Gavrin🇷🇺 · V.V. Gorbachev🇷🇺 · D.S. Gorbunov🇷🇺 · W.C. Haxton🇺🇸 · T.V. Ibragimova🇷🇺 · I. Kim🇺🇸 and 18 other authors

   The Baksan Experiment on Sterile Transitions (BEST) was designed to investigate the deficit of electron neutrinos, ${\nu }_e$, observed in previous gallium-based radiochemical measurements with high-intensity neutrino sources, commonly referred to as the \textit{gallium anomaly}, which could be interpreted as evidence for oscillations between ${\nu }_e$ and sterile neutrino (${\nu }_s$) states. A 3.414-MCi \nuc{51}{Cr} ${\nu }_e$ source was placed at the center of two nested Ga volumes and measurements were made of the production of \nuc{71}{Ge} through the charged current reaction, \nuc{71}{Ga}(${\nu }_e$,e${}^{-}$)\nuc{71}{Ge}, at two average distances. The measured production rates for the inner and the outer targets respectively are ($54.9_{-2.4}^{+2.5}(\text{mbox}stat)\pm 1.4(\text{mbox}syst)$) and ($55.6_{-2.6}^{+2.7}(\text{mbox}stat)\pm 1.4(\text{mbox}syst)$) atoms of \nuc{71}{Ge}/d. The ratio ($R$) of the measured rate of \nuc{71}{Ge} production at each distance to the expected rate from the known cross section and experimental efficiencies are $R_{in}=0.79\pm 0.05$ and $R_{out}=0.77\pm 0.05$. The ratio of the outer to the inner result is 0.97$\pm$0.07, which is consistent with unity within uncertainty. The rates at each distance were found to be similar, but 20-24\% lower than expected, thus reaffirming the anomaly. These results are consistent with ${\nu }_e\to {\nu }_s$ oscillations with a relatively large $\Delta m^2$ ($>$0.5 eV${}^2$) and mixing sin${}^{2}2\theta$ ($\approx$0.4).

   nucl-exhep-exPRL(2022)·245 citations
4. 04*

   Charmonium in nuclear matter and nuclei

   J.J. Cobos Martínez🇲🇽 · K. Tsushima🇧🇷 · G. Krein🇧🇷 · A.W. Thomas🇦🇺

   We present results for the ${\eta }_c$-nucleus bound state energies for various nuclei using an effective Lagrangians approach. The attractive potentials for the ${\eta }_c$ in the nuclear medium originate from the medium-modified intermediate $D{D}^{\ast }$ state in the ${\eta }_c$ self energy, using the local density approximation. Our results suggest that the ${\eta }_c$ should form bound states with all the nuclei considered

   ↳ nucl-thhep-exhep-phnucl-exPoS(2021)·1 citation
5. 05*

   Simulating the neutrino flux from the Spallation Neutron Source for the COHERENT experiment

   COHERENT Collaboration · D. Akimov · P. An · C. Awe · P.S. Barbeau · B. Becker · V. Belov · I. Bernardi · M.A. Blackston · C. Bock · A. Bolozdynya · J. Browning and 71 other authors

   The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as a byproduct of this operation, an intense source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investigate coherent elastic neutrino-nucleus scattering and other physics with a suite of detectors. This work includes a description of our Geant4 simulation of neutrino production at the SNS and the flux calculation which informs the COHERENT studies. We estimate the uncertainty of this calculation at about 10% based on validation against available low-energy pion production data.

   ↳ hep-exnucl-exPRD(2022)·58 citations
6. 06*

   Three-body resonances in pionless effective field theory

   Sebastian Dietz🇩🇪 · Hans-Werner Hammer🇩🇪 · Sebastian König🇺🇸 · Achim Schwenk🇩🇪

   We investigate the appearance of resonances in three-body systems using pionless effective field theory at leading order. The Faddeev equation is analytically continued to the unphysical sheet adjacent to the positive real energy axis using a contour rotation. We consider both, the three-boson system and the three-neutron system. For the former, we calculate the trajectory of Borromean three-body Efimov states turning into resonances as they cross the three-body threshold. For the latter, we find no sign of three-body resonances or virtual states at leading order. This result is validated by exploring the level structure of three-body states in a finite volume approach.

   ↳ nucl-thnucl-exPRC(2022)·19 citations
7. 07*

   RIPTIDE: a novel recoil-proton track imaging detector for fast neutrons

   Agatino Musumarra🇪🇸 · Franco Leone · Cristian Massimi🇮🇹 · Maria Grazia Pellegriti🇫🇷 · Francesco Romano · Roberto Spighi · Mauro Villa

   Neutron detectors are an essential tool for the development of many research fields, as nuclear, particle and astroparticle physics as well as radiotherapy and radiation safety. Since neutrons cannot directly ionize, their detection is only possible via nuclear reactions. Consequently, neutron-based experimental techniques are related to the detection of charged particle or electromagnetic radiation originating from neutron-induced reactions. The study of fast neutrons is often based on the neutron-proton elastic scattering reaction. In this case, the ionization induced by the recoil protons in a hydrogenous material constitutes the basic information for the design and development of neutron detectors. Although experimental techniques have continuously improved and refined, so far, proton-recoil track imaging is still weak in laboratory rate environments because of the extremely small detection efficiency. To address this deficiency, we propose a novel recoil-proton track imaging system in which the light deriving from a fast scintillation signal is used to perform a complete reconstruction in space and time of the event. In particular, we report the idea of RIPTIDE (RecoIl Proton Track Imaging DEtector): an innovative system which combines a plastic scintillator coupled to imaging devices, based on CMOS technology, or Micro Channel Plate sensors. The proposed apparatus aims at providing neutron spectrometry capability by stereoscopically imaging the recoil-protons tracks, correlating the spatial information with the time information.

   ↳ physics.ins-detnucl-exJINST(2021)·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.