Thu·Jul 14, 2022Thursday·July 14, 2022

1. 01*

   High-precision mass measurement of ${}^{24}$Si and a refined determination of the $rp$ process at the $A=22$ waiting point

   D. Puentes🇺🇸 · Z. Meisel🇺🇸 · G. Bollen🇺🇸 · A. Hamaker🇺🇸 · C. Langer🇩🇪 · E. Leistenschneider🇺🇸 · C. Nicoloff🇺🇸 · W.-J. Ong🇺🇸 · M. Redshaw🇺🇸 · R. Ringle🇺🇸 · C. S. Sumithrarachchi🇺🇸 · J. Surbrook🇺🇸 · A. A. Valverde🇨🇦 · I. T. Yandow🇺🇸

   We report a high precision mass measurement of ${}^{24}\mathrm{Si}$, performed with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The atomic mass excess, $10753.8$(37) keV, is a factor of 5 more precise than previous results. This substantially reduces the uncertainty of the ${}^{23}\mathrm{Al}(p,\gamma {)}^{24}\mathrm{Si}$ reaction rate, which is a key part of the rapid proton capture ($rp$) process powering Type I X-ray bursts. The updated rate constrains the onset temperature of the $(\alpha ,p)$ process at the ${}^{22}\mathrm{Mg}$ waiting-point to a precision of 9%.

   nucl-exPRC(2022)·7 citations
2. 02*

   Improved measurement of the $0_2^{+}\to 0_1^{+}$ E0 transition strength for ${}^{72}$Se using the SPICE spectrometer

   J. Smallcombe🇯🇵 · A.B. Garnsworthy🇨🇦 · W. Korten🇫🇷 · P. Singh🇫🇷 · F.A. Ali🇨🇦 · C. Andreoiu🇨🇦 · S. Ansari🇫🇷 · G.C. Ball🇨🇦 · C.J. Barton🇬🇧 · S.S. Bhattacharjee🇨🇦 · M. Bowry🇨🇦 · R. Caballero-Folch🇨🇦 and 13 other authors

   The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton dripline. In this work a study of ${}^{72}$Se by internal conversion electron and $\gamma$-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the $0_2^{+}$ state were performed yielding a determination of ${\rho }^2(E0;0_2^{+}\to 0_1^{+})=29(3)$ milliunits. two state mixing calculations were performed that highlighted the importance of interpretation of such $E0$ strength values in the context of shape-coexistence.

   nucl-exPRC(2022)·6 citations
3. 03*

   High precision measurement of the ${}^6$He half-life

   M. Kanafani🇫🇷 · X. Fléchard🇫🇷 · O. Naviliat-Cuncic🇫🇷 · G.D. Chung🇫🇷 · S. Leblond🇫🇷 · E. Liénard🇫🇷 · X. Mougeot🇫🇷 · G. Quéméner🇫🇷 · A. Simancas Di Filippo🇫🇷 · J-C. Thomas🇫🇷

   The half-life of ${}^6$He has been measured using a low energy radioactive beam implanted in a YAP scintillator and recording decay events in a 4$\pi$ geometry. Events were time-stamped with a digital data acquisition system enabling a reliable control of dead-time effects and detector gain variations. The result, $T_{1/2}=(807.25\pm 0.16_{\mathrm{stat}}\pm 0.11_{\mathrm{sys}}$)~ms, provides the most precise value obtained so far and is consistent with the only previous measurement having a precision smaller than 0.1%. This resolves the longstanding discrepancy previously observed between two sets of measurements.

   nucl-exPRC(2022)·12 citations
4. 04*

   Search for Lorentz-Invariance Violation with the first KATRIN data

   M. Aker🇩🇪 · D. Batzler🇩🇪 · A. Beglarian🇩🇪 · J. Behrens🇩🇪 · A. Berlev🇷🇺 · U. Besserer🇩🇪 · B. Bieringer🇩🇪 · F. Block🇩🇪 · S. Bobien🇩🇪 · B. Bornschein🇩🇪 · L. Bornschein🇩🇪 · M. Böttcher🇩🇪 and 121 other authors

   Some extensions of the Standard Model of Particle Physics allow for Lorentz invariance and Charge-Parity-Time (CPT)-invariance violations. In the neutrino sector strong constraints have been set by neutrino-oscillation and time-of-flight experiments. However, some Lorentz-invariance-violating parameters are not accessible via these probes. In this work, we focus on the parameters $(a_{\text{of}}^{(3)}{)}_{00}$, $(a_{\text{of}}^{(3)}{)}_{10}$ and $(a_{\text{of}}^{(3)}{)}_{11}$ which would manifest themselves in a non-isotropic beta-decaying source as a sidereal oscillation and an overall shift of the spectral endpoint. Based on the data of the first scientific run of the KATRIN experiment, we set the first limit on $\left|(a_{\text{of}}^{(3)}{)}_{11}\right|$ of $<3.7\cdot 10^{-6}$ GeV at 90\% confidence level. Moreover, we derive new constraints on $(a_{\text{of}}^{(3)}{)}_{00}$ and $(a_{\text{of}}^{(3)}{)}_{10}$.

   nucl-exhep-exhep-phPRD(2023)·27 citations
5. 05*

   Search for keV-scale Sterile Neutrinos with first KATRIN Data

   M. Aker🇩🇪 · D. Batzler🇩🇪 · A. Beglarian🇩🇪 · J. Behrens🇩🇪 · A. Berlev🇷🇺 · U. Besserer🇩🇪 · B. Bieringer🇩🇪 · F. Block🇩🇪 · S. Bobien🇩🇪 · B. Bornschein🇩🇪 · L. Bornschein🇩🇪 · M. Böttcher🇩🇪 and 119 other authors

   In this work we present a keV-scale sterile-neutrino search with the first tritium data of the KATRIN experiment, acquired in the commissioning run in 2018. KATRIN performs a spectroscopic measurement of the tritium $\beta$-decay spectrum with the main goal of directly determining the effective electron anti-neutrino mass. During this commissioning phase a lower tritium activity facilitated the search for sterile neutrinos with a mass of up to $1.6\mathrm{keV}$. We do not find a signal and set an exclusion limit on the sterile-to-active mixing amplitude of down to ${\sin }^2\theta <5\cdot 10^{-4}$ ($95\%$ C.L.), improving current laboratory-based bounds in the sterile-neutrino mass range between 0.1 and $1.0\mathrm{keV}$.

   nucl-exEPJC(2023)·37 citations
6. 06*

   Temperature and net baryochemical potential dependence of $\eta /s$ in a hybrid approach

   Niklas Götz🇩🇪 · Hannah Elfner🇩🇪

   In this work, the qualitative impact of the net baryochemical potential dependence of the shear viscosity to entropy density ratio $\eta /s$ in hydrodynamical simulations is studied. The effect of a predicted non-constant $\eta /s$(${\mu }_B$) is largely unexplored in hydrodynamic simulations. Previous studies focus only on a temperature dependence or even only a constant effective shear viscosity. This work addresses this issue by studying qualitatively the effect of a generalized $\eta /s$($T,{\mu }_B$) in the hybrid approach SMASH-vHLLE, composed of the hadronic transport approach SMASH and the (3+1)d viscous hydrodynamic code vHLLE. In order to reduce the bias of the result on the equation of state used in the hydrodynamic part of the model, $\eta /s$ is parameterized directly in the energy density and net baryon number density. The parameterization takes into account the constraints of matching to the transport coefficients in the hadronic phase, as well as pQCD results. This work compares the impact of the density dependence for different system sizes and energies and compares the observables with experimental results in the RHIC - BES region $\sqrt{s_{NN}}$ =7.7 - 39.0 GeV, as the effect of this generalization is especially relevant for intermediate collision energies, for which the system is in equilibrium for a relevant amount of time, but the net baryochemical potential does not vanish. It is shown that the effect of an explicit net baryon number dependence on the elliptic flow is negligible and only relevant in the early stages of the collision. Additionally, we find that the proposed parameterization could be a good proxy for the shear viscosity in the non-equilibrium hadronic transport stage.

   ↳ hep-phnucl-exnucl-thPRC(2022)·15 citations
7. 07*

   Searches for massive neutrinos with mechanical quantum sensors

   Daniel Carney🇺🇸 · Kyle G. Leach🇺🇸 · David C. Moore🇺🇸

   The development of quantum optomechanics now allows mechanical sensors with femtogram masses to be controlled and measured in the quantum regime. If the mechanical element contains isotopes that undergo nuclear decay, measuring the recoil of the sensor following the decay allows reconstruction of the total momentum of all emitted particles, including any neutral particles that may escape detection in traditional detectors. As an example, for weak nuclear decays the momentum of the emitted neutrino can be reconstructed on an event-by-event basis. We present the concept that a single nanometer-scale, optically levitated sensor operated with sensitivity near the standard quantum limit can search for heavy sterile neutrinos in the keV-MeV mass range with sensitivity significantly beyond existing constraints. We also comment on the possibility that mechanical sensors operated well into the quantum regime might ultimately reach the sensitivities required to provide an absolute measurement of the mass of the light neutrino states.

   ↳ hep-exhep-phnucl-exphysics.ins-det+1PRX Quantum(2023)·51 citations
8. 08*

   Design of the High Rigidity Spectrometer at FRIB

   S. Noji🇺🇸 · R. G. T. Zegers🇺🇸 · G. P. A. Berg · A. M. Amthor · T. Baumann · D. Bazin🇺🇸 · E. E. Burkhardt · M. Cortesi🇺🇸 · J. C. DeKamp · M. Hausmann · M. Portillo · D. H. Potterveld🇺🇸 and 4 other authors

   A High Rigidity Spectrometer (HRS) has been designed for experiments at the Facility for Rare-Isotope Beams (FRIB) at Michigan State University (MSU). The HRS will allow experiments to be performed with the most exotic neutron-rich isotopes at high beam energies ($\gtrsim$100MeV/u). The HRS consists of an analysis beamline called the High-Transmission Beamline (HTBL) and the spectrometer proper called the Spectrometer Section. The maximum magnetic rigidity of the HRS is 8Tm, which corresponds to the rigidities at which rare-isotope beams are optimally produced at FRIB. The resolving power, angular acceptance, and momentum acceptance are set to match the anticipated scientific program. An ion-optical design developed for the HRS is described in detail, along with the specifications of the associated magnet and detector systems.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2023)·11 citations
9. 09*

   Study on SiPM performance at low temperatures between $-60^{\circ }$C and $-20^{\circ }$C

   C. Zhong🇨🇳 · F. J. Luo🇨🇳 · B. Zheng · X. D. Wang · M. Y. Bu · J. Zou🇨🇳 · M. N. Deng

   Radon is the main background source of dark matter and neutrino experiments. Radon concentration ($mBq/{\mathrm{m}}^3$) measurement by liquid scintillation detector is a highly sensitive method at low temperatures using silicon photomultipliers (SiPMs) arrays. The SiPM performance characteristics are closely related to the lower detection limit of the detector. In this study, we built an automatic and accurate low-temperature measurement system to study the single photoelectron spectrum, SPE resolution, optical crosstalk, and after-pulse of the SiPM at different temperatures. As a result, we obtained the variation trend of the SiPM parameters at different temperatures, and the SiPM optimal working conditions were obtained, which can improve the detector's sensitivity

   ↳ physics.ins-detnucl-exJINST(2022)·5 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.