Fri·Mar 29, 2024Friday·March 29, 2024

1. 01*

   Cross-checking the geometric effects in heavy-ion collisions at 1 GeV/nucleon

   Zu-Xing Yang🇯🇵 · Xiao-Hua Fan🇨🇳 · Zhi-Pan Li🇨🇳 · Shunji Nishimura🇯🇵

   Employing the isospin-dependent Boltzmann-Uehling-Uhlenbeck transport model, the 1 GeV/nucleon deformed uranium-uranium ultra-central collisions are simulated. Based on sensitive observables, mean square collective flow and pion meson multiplicity, the impacts of high-momentum tails caused by short-range correlations and the symmetry energy in high-density regions on geometric effects are discussed under different reaction orientations. Finally, the neural network model for identifying reaction orientations is also developed.

   ↳ nucl-thnucl-ex0 citations
2. 02*

   Development of wavelength-shifting PEN foils for next generation experiments

   M. Kuźniak🇵🇱 · S. Pawłowski🇵🇱 · A. Abramowicz🇵🇱 · A. F. V. Cortez🇵🇱 · M. Kumosiński🇵🇱 · T. Łęcki🇵🇱 · G. Nieradka🇵🇱

   Polyethylene naphthalate (PEN) foils have been demonstrated as a wavelength shifter suitable for operation in liquid argon. At the same time, wavelength shifting efficiency of technical grades of PEN, commercially available on the market, is lower than that of tetraphenyl butadiene (TPB). This paper reports on an R&D program focused on exploring the intrinsic limitations of PEN and optimizing it for the highest achievable wavelength shifting efficiency.

   ↳ astro-ph.IMhep-exnucl-exphysics.ins-detJINST(2024)·1 citation
3. 03*

   The SNO+ Journey to $0\nu \beta \beta$

   A. S. Inácio🇵🇹 · W. Parker🇬🇧 · B. Tam🇨🇦

   SNO+ is a large multipurpose experiment with the ultimate goal of searching for the neutrinoless double beta decay in ${}^{130}\mathrm{Te}$. After a commissioning phase with water as the target medium, during which acquired data allowed for measurements of solar neutrinos and the detection of reactor antineutrinos, SNO+ is now filled with 780 tonnes of liquid scintillator. The higher light yield of the scintillator enhances the physics capabilities of the experiment, and a physics program including reactor, geo and solar neutrinos is currently underway. The water and unloaded scintillator phases provide crucial commissioning milestones in preparation for the tellurium loading, such as calibrating the detector and making extensive background constraint measurements as components of the final scintillator cocktail are gradually added. In a first phase, 3900~kg of natural tellurium (0.5%) will be added to the scintillator for a predicted sensitivity of about $2\times 20^{26}$ years (90% CL) with 3 years of livetime. Higher tellurium loading will follow for predicted sensitivities above $1\times 10^{27}$ years (3% loading).

   ↳ hep-exnucl-ex3 citations
4. 04*

   Angular dependence in transverse momentum dependent diffractive parton distributions at small-$x$

   Yoshitaka Hatta🇺🇸 · Feng Yuan🇺🇸

   We discuss the angular dependence of the recently proposed transverse momentum dependent quark and gluon diffractive parton distributions at small-$x$. We introduce the difractive versions of the Sivers function and the elliptic gluon Wigner distribution and evaluate them in simple models with gluon saturation and study their geometric scaling properties. We also show that the diffractive version of the linearly polarized gluon distribution identically vanishes to leading order. These distributions enrich the physics opportunities for measuring semi-inclsuive diffractive DIS processes at the future electron-ion colliders.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2024)·14 citations
5. 05*

   YAP:Ce scintillator as an absolute ultracold neutron detector

   M. Krivoš · Z. Tang🇺🇸 · N. Floyd🇺🇸 · C. L. Morris🇺🇸 · M. Blatnik🇺🇸 · C. Cude-Woods · S. M. Clayton🇺🇸 · A. T. Holley🇺🇸 · T. M. Ito🇺🇸 · C.-Y. Liu · M. Makela · I. F. Martinez and 5 other authors

   The upcoming UCNProBe experiment at Los Alamos National Laboratory will measure the $\beta$-decay rate of free neutrons with different systematic uncertainties than previous beam-based neutron lifetime experiments. We have developed a new ${}^{10}$B-coated YAP:Ce scintillator whose properties are presented. The advantage of the YAP:Ce scintillator is its high Fermi potential, which reduces the probability for upscattering of ultracold neutrons, and its short decay time, which is important at high counting rates. Birks' coefficient of YAP:Ce was measured to be ($5.56_{-0.30}^{+0.05})\times 10^{-4}$ cm/MeV and light losses due to 120 nm of ${}^{10}$B-coating to be about 60%. The loss of light from YAP:Ce due to transmission through deuterated polystyrene scintillator was about 50%. The efficiency for counting neutrons that are captured on the ${}^{10}$B coating is (86.82 $\pm$ 2.61)%. Measurement with ultracold neutrons showed that YAP:Ce crystal counted 8% to 28% more UCNs compared to ZnS screen. This may be due to an uneven coating of ${}^{10}$B on the rough surface.

   ↳ physics.ins-detnucl-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.