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Initial results of the TRIUMF ultracold advanced neutron source

arXiv:2509.02916v4 Announce Type: replace-cross Abstract: We report the first results on ultracold neutron production from a new spallation-driven superfluid $^4$He (He-II) source at TRIUMF, which is being prepared for a new, precise measurement of the neutron electric dipole moment. A total of $(9.3 \pm 0.8)\times 10^{5}$ ultracold neutrons were observed at a proton beam current of \SI{37}{\uA}, when the target was irradiated for a period of \SI{60}{\s}.

arXiv Physics 1d ago

Quantum shell structure reveals new rule for proton-neutron pairing inside nuclei

Quantum shell structure reveals new rule for proton-neutron pairing inside nuclei Sadie Harley Scientific Editor Robert Egan Associate Editor Nuclear physicists used a little magic in their latest experiment conducted at the U.S. Department of Energy's Thomas Jefferson National Accelerator Facility, and the result has revealed surprising new information about the behavior of protons and neutrons inside the atom's nucleus. Specifically, the research revealed another requirement that...

Phys.org 5d ago

How heavy can a neutron star get?

How heavy can a neutron star get? Sadie Harley Scientific Editor Andrew Zinin Lead Editor The physics of neutron stars are almost too fantastic to believe: something the weight of two suns compacted to a sphere the size of a city.

Phys.org 7d ago

Neutron star merger simulations gain new precision with AI-driven r-process heating

Neutron star merger simulations gain new precision with AI-driven r-process heating Gaby Clark Scientific Editor Robert Egan Associate Editor Using a novel simulation model based on machine learning, an international research team at GSI/FAIR has succeeded in gaining a deeper understanding of element formation in stellar events such as neutron star mergers. For the first time, the scientists used deep learning with a neural network to model the energy release during r-process nucleosynthesis...

Phys.org 1d ago

Development of a Multi-Purpose Optical TPC for Neutron-Induced Reaction Studies at SARAF

arXiv:2605.31382v1 Announce Type: new Abstract: Neutron-induced reactions play a central role in stellar and Big Bang nucleosynthesis models. Yet many of the cross sections remain poorly constrained at astrophysically relevant energies. To address these needs, we are developing a multi-purpose Optical Time Projection Chamber (OTPC) optimized for precision neutron-reaction studies at the Soreq Applied Research Accelerator Facility (SARAF)

arXiv Physics 9d ago

SINAPSE: A lightweight deep learning framework for accurate and explainable neutron-$\gamma$ discrimination

arXiv:2605.13627v2 Announce Type: replace Abstract: Traditionally, neutron-$\gamma$ discrimination in organic scintillators relies on techniques such as time-of-flight (ToF) selection and pulse-shape discrimination (PSD). However, particle identification through graphical cuts remains challenging in the low-charge regime due to poor signal-to-noise ratios (SNR). In this work, we propose SINAPSE, a lightweight deep learning framework for accurate and explainable neutron-$\gamma$...

arXiv Physics 8d ago

Study on the shielding efficiency of water, HDPE, and boron-loaded HDPE for neutron background of plastic scintillator neutrino detector

arXiv:2606.08968v1 Announce Type: new Abstract: Surface-level reactor antineutrino experiments usually have substantial cosmic ray induced neutron backgrounds, particularly with shallow overburden. The Array of Lattice for Anti-neutrino Reactor Monitoring (ALARM) is a plastic scintillator based experiment designed for reactor power monitoring. It will be deployed about 44 m from the core of a reactor at the Taishan Nuclear Power Plant.

arXiv Physics 1d ago

Fast-Neutron Irradiation Effect in Heteroepitaxial $\beta$-Ga$_2$O$_3$ Schottky Diodes Fabricated on Low-Cost Sapphire Substrates

Announce Type: new Abstract: In this work, we investigate the response of Ni/$\beta$-Ga$_2$O$_3$ Schottky barrier diodes fabricated on c-plane sapphire to fast-neutron irradiation up to a fluence of $1\times10^{15}$ n$\cdot$cm$^{-2}$. The LPCVD-grown heteroepitaxial structure consists of an unintentionally doped buffer, an n$^{+}$ contact layer, and an n-type drift layer, with mesa isolation realized by plasma-free Ga-assisted LPCVD etching. Prior to irradiation, the devices exhibit a...

arXiv Physics 7h ago

A Method for Neutron-Gamma Pulse Shape Discrimination of CLYC Detector Based on a Gated Residual-Linear Attention Network

arXiv:2606.02613v1 Announce Type: new Abstract: The discrimination of neutron and gamma pulse shapes is a key technology in fields such as nuclear safety monitoring and radiation assessment. An enhanced recursive gated cyclic residual-sparse linear attention network is developed on the CLYC detector experimental platform to overcome weak noise resistance, limited feature extraction and inferior real-time performance of conventional algorithms. The experimental dataset comprises 19,971...

arXiv Physics 7d ago

Plasticity of Neutron Star Crusts

Announce Type: cross Abstract: We use first-principles molecular dynamics simulations to study the deformation and breaking of neutron star crusts. When simulating with strain rates several orders of magnitude slower than prior work, we find a new regime of steady plastic flow beyond the breaking point that is independent of the initial crystal structure. Polycrystals exhibit a robust transition from linear elasticity to perfect plastic flow at shear strains of $\epsilon = 0.05$, while...

arXiv Physics 2d ago