Mon·Dec 12, 2022Monday·December 12, 2022

1. 01*

   Measurement of the production of (anti)nuclei in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV

   ALICE Collaboration

   Measurements of (anti)proton, (anti)deuteron, and (anti)${}^3$He production in the rapidity range $-1<y<0$ as a function of the transverse momentum and event multiplicity in p-Pb collisions at a center-of-mass energy per nucleon-nucleon pair $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV are presented. The coalescence parameters $B_2$ and $B_3$, measured as a function of the transverse momentum per nucleon and of the mean charged-particle multiplicity density, confirm a smooth evolution from low to high multiplicity across different collision systems and energies. The ratios between (anti)deuteron and (anti)${}^3$He yields and those of (anti)protons are also reported as a function of the mean charged-particle multiplicity density. A comparison with the predictions of the statistical hadronization and coalescence models for different collision systems and center-of-mass energies favors the coalescence description for the deuteron-to-proton yield ratio with respect to the canonical statistical model.

   nucl-exhep-exPLB(2023)·21 citations
2. 02*

   High-resolution laser system for the S3-Low Energy Branch

   Jekabs Romans🇧🇪 · Anjali Ajayakumar🇫🇷 · Martial Authier🇫🇷 · Frederic Boumard🇫🇷 · Lucia Caceres🇫🇷 · Jean-Francois Cam🇫🇷 · Arno Claessens🇧🇪 · Samuel Damoy🇫🇷 · Pierre Delahaye🇫🇷 · Philippe Desrues🇫🇷 · Wenling Dong🇫🇷 · Antoine Drouart🇫🇷 and 30 other authors

   In this paper we present the first high-resolution laser spectroscopy results obtained at the GISELE laser laboratory of the GANIL-SPIRAL2 facility, in preparation for the first experiments with the S${}^3$-Low Energy Branch. Studies of neutron-deficient radioactive isotopes of erbium and tin represent the first physics cases to be studied at S${}^3$. The measured isotope-shift and hyperfine structure data are presented for stable isotopes of these elements. The erbium isotopes were studied using the $4f^{12}6s^2$ ${}^3{H}_6\to 4f^{12}{(}^{3}H)6s6p$ $J=5$ atomic transition (415 nm) and the tin isotopes were studied by the $5s^{2}5p^2{(}^3{P}_0)\to 5s^{2}5p6s{(}^3{P}_1)$ atomic transition (286.4 nm), and are used as a benchmark of the laser setup. Additionally, the tin isotopes were studied by the $5s^{2}5p6s{(}^3{P}_1)\to 5s^{2}5p6p{(}^3{P}_2)$ atomic transition (811.6 nm), for which new isotope-shift data was obtained and the corresponding field-shift $F_{812}$ and mass-shift $M_{812}$ factors are presented.

   nucl-exphysics.atom-phNucl.Instrum.Meth.B(2023)·4 citations
3. 03*

   Tritium Beta Spectrum and Neutrino Mass Limit from Cyclotron Radiation Emission Spectroscopy

   Project 8 Collaboration: A. Ashtari Esfahani🇺🇸 · S. Böser🇩🇪 · N. Buzinsky🇺🇸 · M. C. Carmona-Benitez🇺🇸 · C. Claessens🇺🇸 · L. de Viveiros🇺🇸 · P. J. Doe🇺🇸 · M. Fertl🇩🇪 · J. A. Formaggio🇺🇸 · J. K. Gaison🇺🇸 · L. Gladstone🇺🇸 · M. Grando🇺🇸 and 46 other authors

   The absolute scale of the neutrino mass plays a critical role in physics at every scale, from the particle to the cosmological. Measurements of the tritium endpoint spectrum have provided the most precise direct limit on the neutrino mass scale. In this Letter, we present advances by Project 8 to the Cyclotron Radiation Emission Spectroscopy (CRES) technique culminating in the first frequency-based neutrino mass limit. With only a cm${}^3$-scale physical detection volume, a limit of $m_{\beta }<$155 eV ($152$ eV) is extracted from the background-free measurement of the continuous tritium beta spectrum in a Bayesian (frequentist) analysis. Using ${}^{83\mathrm{m}}$Kr calibration data, an improved resolution of 1.66$\pm$0.19 eV (FWHM) is measured, the detector response model is validated, and the efficiency is characterized over the multi-keV tritium analysis window. These measurements establish the potential of CRES for a high-sensitivity next-generation direct neutrino mass experiment featuring low background and high resolution.

   nucl-exhep-exPRL(2023)·69 citations
4. 04*

   The Gerasimov-Drell-Hearn sum-rule with nuclear targets

   Steven D. Bass🇵🇱 · Paolo Pedroni🇮🇹 · Andreas Thomas🇩🇪

   Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton's anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, ${}^3$He, ${}^6$Li and ${}^7$Li. The largest contribution to the GDH sum rule comes from the $\Delta$ resonance excitation. In existing data with polarised deuterons and ${}^3$He the $\Delta$ excitation is shifted to slightly lower energy when compared to model predictions where the $\Delta$ is treated with its free mass.

   ↳ nucl-thhep-phnucl-exEPJA(2023)·4 citations
5. 05*

   Background Rejection in Highly Pixelated Solid-State Detectors

   Alvaro E. Chavarria🇺🇸

   Highly pixelated solid-state detectors offer outstanding capabilities in the identification and suppression of backgrounds from natural radioactivity. We present the background-identification strategies developed for the DAMIC experiment, which employs silicon charge-coupled devices to search for dark matter. DAMIC has demonstrated the capability to disentangle and measure the activities of every $\beta$ emitter from the ${}^{32}$Si, ${}^{238}$U and ${}^{232}$Th decay chains in the silicon target. Similar strategies will be adopted by the Selena Neutrino Experiment, which will employ hybrid amorphous ${}^{82}$Se/CMOS imagers to perform spectroscopy of $\beta \beta$ decay and solar neutrinos. We present the proposed experimental strategy for Selena to achieve zero-background in a 100-ton-year exposure.

   ↳ physics.ins-detnucl-exAIP Conf.Proc.(2023)·2 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.