Fri·Jan 2, 2026Friday·January 2, 2026

1. 01*

   KATRIN experiment

   Guido Drexlin🇩🇪 · Christian Weinheimer🇩🇪

   Since the discovery of neutrino oscillations, it is known that neutrinos have small but non-zero masses. The neutrino mass scale, which is of fundamental importance for cosmology, astrophysics and particle physics, can be measured directly from the kinematics of weak decays. The Karlsruhe tritium neutrino experiment KATRIN measures the end point region of the tritium \b{eta}-spectrum with unrivalled t statistics and an unprecedented precision. This world-leading direct neutrino mass search experiment is characterised by a windowless, gaseous molecular tritium source and a giant MAC- E filter-type spectrometer. The precision measurement of the tritium \b{eta}-spectrum also allows the search for many other phenomena beyond the Standard Model of particle physics. The KATRIN experiment is about to reach its target sensitivity of the neutrino mass of less than 300 meV and will then turn its attention to the search for sterile keV neutrinos before the neutrino mass sensitivity is to be significantly increased once again by applying quantum read-out technology combined with an atomic tritium source with KATRIN++.

   nucl-exhep-ex4 citations
2. 02*

   Revisiting p-${}^{11}$B Fusion: Updated Cross-sections, Reactivity, and Energy Balance

   Hong-Yi Wang🇨🇳 · Yu-Qi Li · Qian Wu🇨🇳 · Zhu-Fang Cui🇨🇳

   Recent experimental progress has substantially improved the available cross-section data for the p-${}^{11}$B fusion reaction, particularly in energy regions that previously lacked direct measurements. In this study, we develop a high-precision analytical parameterization of the p-${}^{11}$B reaction cross-section over the 0--10 MeV energy range, incorporating the new experimental data into a continuous and numerically efficient representation. Using this parameterization, we evaluate the thermonuclear reactivity of the p-${}^{11}$B reaction and examine the effects of the dominant resonance at 0.6 MeV and a newly observed resonance around 4.7 MeV. Furthermore, we assess the energy balance by analyzing the fusion power density and the electron bremsstrahlung power density. Our results indicate that p-${}^{11}$B fusion is not precluded by bremsstrahlung constraints when contemporary cross-section data and self-consistent thermal modeling are employed.

   ↳ nucl-thastro-ph.HEnucl-exphysics.plasm-ph2 citations
3. 03*

   The Maximal Entanglement Limit in Statistical and High Energy Physics

   Dmitri E. Kharzeev🇺🇸

   These lectures advocate the idea that quantum entanglement provides a unifying foundation for both statistical physics and high-energy interactions. I argue that, at sufficiently long times or high energies, most quantum systems approach a Maximal Entanglement Limit (MEL) in which phases of quantum states become unobservable, reduced density matrices acquire a thermal form, and probabilistic descriptions emerge without invoking ergodicity or classical randomness. Within this framework, the emergence of probabilistic parton model, thermalization in the break-up of confining strings and in high-energy collisions, and the universal small $x$ behavior of structure functions arise as direct consequences of entanglement and geometry of high-dimensional Hilbert space.

   ↳ quant-phhep-phhep-thnucl-ex+1Acta Phys.Polon.B(2026)·7 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.