Mon·Mar 7, 2022Monday·March 7, 2022

1. 01*

   Investigation of long lived activity produced due to neutron emitting reactions

   Tanmoy Bar · Dipali Basak🇮🇳 · Sukhendu Saha · Lalit Kumar Sahoo · Chinmay Basu

   In this article, a detailed investigation has been done for the long lived gamma activity due to neutron emitting experiments. These calculations mainly focused on the experiments used for energy calibration purposes. Calibrated energy is one of the most essential features of any accelerator facility. Several experiments have been used for this purpose. Generally, experiments having sharp curvature change in cross section of yield are used. Neutron emitting experiments are one of such. Around the globe reactions like ${}^{7}Li(p,n)$, ${}^{13}C(p,n)$, ${}^{19}F(p,n)$, ${}^{27}Al(p,n)$ etc. are used to calibrate energy of the beam with accelerator terminal voltage. Neutrons coming from these experiments can interact with surrounding elements. These interactions with neutrons can create long lived gamma activity which may interfere with future measurements. The present study has been done keeping in mind the new Facility for Research in Experimental Nuclear Astrophysics (FRENA) at Saha Institute of Nuclear Physics. It is a 3MV tandetron low energy high current machine.

   nucl-ex1 citation
2. 02*

   Search for charge nonconservation and Pauli exclusion principle violation with the Majorana Demonstrator

   MAJORANA Collaboration: I. J. Arnquist · F. T. Avignone III · A. S. Barabash · C. J. Barton · K. H. Bhimani · E. Blalock · B. Bos · M. Busch · M. Buuck · T. S. Caldwell · Y-D. Chan · C. D. Christofferson and 45 other authors

   Charge conservation and the Pauli exclusion principle result from fundamental symmetries in the standard model of particle physics, and are typically taken as axiomatic. High-precision tests for small violations of these symmetries could point to new physics. Here we consider three models for violation of these processes, which would produce detectable ionization in the high-purity germanium detectors of the \MJD\ experiment. Using a 37.5 kg-yr exposure, we report a lower limit on the electron mean lifetime, improving the previous best limit for the $e\to {\nu }_e\overline{{\nu }_e}{\nu }_e$ decay channel by more than an order of magnitude. We also present searches for two types of violation of the Pauli exclusion principle, setting limits on the probability of an electron to be found in a symmetric quantum state.

   nucl-exhep-exNat.Phys.(2024)·13 citations
3. 03*

   Can decay heat measurements tell us something about the Reactor Antineutrino Anomaly?

   A.A. Sonzogni🇺🇸 · R.J. Lorek🇺🇸 · A. Mattera🇺🇸 · E.A. McCutchan🇺🇸

   Measurements of the decay energy released as a function of time following the thermal neutron induced fission on ${}^{235}$U and ${}^{239,241}$Pu were performed in the 1970s at Oak Ridge National Laboratory with the purpose of quantifying possible Loss Of Coolant Accident scenarios. This decay energy, known in technical parlance as decay heat, is mainly composed of two terms, that of the electrons produced together with antineutrinos in the beta-minus decay of the neutron-rich fission products, and that of the gammas produced in the subsequent decay of excited nuclear levels. In this work we study if this extensive set of decay heat measurements can be used to assess the Reactor Antineutrino Anomaly, that is, the approximately 5\% deficit of electron antineutrinos produced by nuclear reactors, first deduced by Mention and collaborators in 2011, and observed by the major reactor antineutrino experiments near nuclear power plants since. With the assistance of nuclear databases, we are able to obtain the ratio of electron spectra under equilibrium conditions for ${}^{235}$U to ${}^{239}$Pu, in better agreement with the lower trend recently reported by Kopeikin and collaborators, as well as those for ${}^{235}$U to ${}^{241}$Pu and ${}^{241}$Pu to ${}^{239}$Pu, which do not agree well with those measured at the Insitut Laue-Langevin in the 1980s. We conclude that a new experimental campaign is needed to measure the electron spectra utilizing a high-resolution and signal-to-noise-ratio electron spectrometer and a highly precise fission normalization procedure.

   nucl-exnucl-th1 citation
4. 04*

   Color Transparency and Light Front Holographic QCD

   Gerald A. Miller🇺🇸

   Color transparency, the reduction of initial- or final-state interactions in coherent nuclear processes, is a natural prediction of QCD provided that small-sized or point-like configurations (PLCs) are responsible for high-momentum transfer, high-energy, semi-exclusive processes. I use the FMS criteria for the existence of PLCs to show that the wave functions of light front holographic QCD, as currently formulated, do not contain a PLC.

   ↳ hep-phnucl-exnucl-thMDPI Physics(2022)·3 citations
5. 05*

   A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics

   J. Aalbers (1 and 2) · K. Abe (3 and 4) · V. Aerne (5) · F. Agostini (6) · S. Ahmed Maouloud (7) · D.S. Akerib (1 and 2) · D.Yu. Akimov (8) · J. Akshat (9) · A.K. Al Musalhi (10) · F. Alder (11) · S.K. Alsum (12) · L. Althueser (13) and 585 other authors

   The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector.

   ↳ physics.ins-detastro-ph.COhep-exnucl-exJ.Phys.G(2023)·221 citations
6. 06*

   Optimization study of the electrode design of a 5 mm thick orthogonal-strip CdZnTe detector system

   Ali Murteza Altingun🇹🇷 · Emrah Kalemci🇹🇷

   The geometry of electrodes is one of the most important factors in determining the performance of orthogonal-strip detectors. The aim of this work is to study the performance of a 5 mm thick cross-strip CdZnTe detector with different electrode widths. Our study consists of two main parts, simulations and experiments. We utilized four different anode sizes ranging from 0.1 mm to 0.6 mm. The anodes were interspersed with steering electrodes with varying sizes from 0.3 mm to 0.85 mm. The maximum gap size between the anodes and steering electrode strips was set to 0.3 mm, while the minimum gap size was 0.125 mm. The performance of the detector was investigated in terms of the steering electrode bias voltage, the energy resolution, and the charge sharing effect. For simulations, we developed a C++ based simulation program for charge transport inside the CdZnTe detector and charge collection at the electrodes. For photon interactions we used GEANT4 toolkit and for electric field and weighting potential simulations we used COMSOL software. The results demonstrated that -50 V is the optimal steering electrode bias for our detector when -500 V was applied to the cathodes and that the energy resolution performance drops with increasing steering electrode width. Also, the charge sharing effect becomes more dominant for larger steering electrode sizes. The experimental result are further compared with the simulations. The results are in a good agreement and the comparison validates our simulation model. Although, our simulation framework has need of better estimation for the intrinsic noise of CdZnTe. These results suggest that an optimization study between electrode widths and steering electrode bias is required to obtain the best performance in orthogonal-strip CdZnTe detectors.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-ex+1Nucl.Instrum.Meth.A(2022)·2 citations
7. 07*

   Consequences of the Dresden-II reactor data for the weak mixing angle and new physics

   D. Aristizabal Sierra🇨🇱 · V. De Romeri🇪🇸 · D. K. Papoulias🇬🇷

   The Dresden-II reactor experiment has recently reported a suggestive evidence for the observation of coherent elastic neutrino-nucleus scattering, using a germanium detector. Given the low recoil energy threshold, these data are particularly interesting for a low-energy determination of the weak mixing angle and for the study of new physics leading to spectral distortions at low momentum transfer. Using two hypotheses for the quenching factor, we study the impact of the data on: (i) The weak mixing angle at a renormalization scale of $\sim 10\text{MeV}$, (ii) neutrino generalized interactions with light mediators, (iii) the sterile neutrino dipole portal. The results for the weak mixing angle show a strong dependence on the quenching factor choice. Although still with large uncertainties, the Dresden-II data provide for the first time a determination of ${\sin }^2{\theta }_W$ at such scale using coherent elastic neutrino-nucleus scattering data. Tight upper limits are placed on the light vector, scalar and tensor mediator scenarios. Kinematic constraints implied by the reactor anti-neutrino flux and the ionization energy threshold allow the sterile neutrino dipole portal to produce up-scattering events with sterile neutrino masses up to $\sim 8$MeV. In this context, we find that limits are also sensitive to the quenching factor choice, but in both cases competitive with those derived from XENON1T data and more stringent that those derived with COHERENT data, in the same sterile neutrino mass range.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2022)·48 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.