First proton directed-flow measurement from Xe+Cs at 3.8 AGeV
New NICA data match JAM and extend equation-of-state tests to a new system.
· “Analysis Note: Directed flow v₁ of protons in the Xe+Cs(I) collisions at 3.8 AGeV”
nucl-ex
Nuclear Experiment
Nuclear Experiment Results from experimental nuclear physics including the areas of fundamental interactions, measurements at low- and medium-energy, as well as relativistic heavy-ion collisions. Does not include: detectors and instrumentation nor analysis methods to conduct experiments; descriptions of experimental programs (present or future); comments on published results
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A 21-sigma lead anomaly meets an 11-target electron scan
The answer decides whether the 21-sigma lead result is a new effect or an artifact.
· “Nuclear Dependence of Beam Normal Single Spin Asymmetry in Elastic Scattering from Nuclei”
First fully corrected energy correlator spans collinear to back-to-back QCD
Using archived ALEPH data, the strong force now has a single measurement reaching the back-to-back limit.
New K radii: isospin breaking in A=38 is zero within error
Precise isotope-shift calculations benchmark the corrections needed to extract Vud from superallowed beta decays.
73,75Br proton removal yields equal cross sections into 72,74Se
Matching cross sections into 72Se and 74Se suggest the same proton orbitals drive both reactions.
· “Proton removal from ^(73,75)Br to ^(72,74)Se at intermediate energies”
Double-beta decay amplitude predicted at next-to-leading order
First uncertainty-quantified EFT value for the elementary decay process could shrink nuclear matrix element errors.
· “Next-to-leading-order prediction for the neutrinoless double-beta decay”
K=7 is the cutoff that fixes the ppp correlation tail
With up to 23 coupled channels, the calculated ppp tail matches the measured one within about two standard deviations.
· “Convergence of the ppp correlation function within the hyperspherical adiabatic basis”
Radial-flow fits get a hotter freeze-out from v0(pT)
Blast-wave model with flow and temperature fluctuations explains the new v0(pT) data and yields hotter freeze-out than pT-spectra fits.
· “Study of p_T-differential radial flow in blast-wave model”
Yttrium-doped BaF2 crystal times particles to 82 ps
Large 200-mm scintillator keeps its fast component while suppressing the slow one, promising sub-100 ps detectors.
· “Scintillation and Timing Performance of a 3at% Yttrium-Doped Barium Fluoride Crystal”
Level density of 128Te extracted without model-based normalization
Photonuclear data fix the scale and slope, so the result is independent of constant-temperature or Fermi-gas assumptions.
· “Nuclear level density of {}¹²⁸Te from (p,p'γ) scattering and complementary photonuclear data”
A density-only functional reproduces deformed 20Ne
Trained on random potentials, it matches Kohn-Sham deformation and energies without single-particle orbitals.
Knockout reactions reveal what exotic nuclei are made of
Distorted-wave theory plus CDCCIA maps measured cross sections to orbits, pairs, and alpha clusters.
· “Reaction mechanism of quasi-free knockout processes in exotic RI beam era”
Backward gamma-ray transport beats forward by 10⁴×
Goupil simulates environmental radiation from a huge source to a tiny detector while keeping photopeaks intact.
· “Goupil: A Monte Carlo engine for the backward transport of low-energy gamma-rays”
One number links nuclear binding energy to charge radius
A measured mirror partner's mass and radius predict the proton-rich side's size and binding.
· “Robust correlation between binding energies and charge radii of mirror nuclei”
Late mean-field potential, not squeeze-out, sets negative v2
UrQMD shows that after the last collision the potential still shapes v2; the final value reflects breakup geometry.
Mercury's hyperfine anomaly measured: rule constant near zero
Fifty years untested; the new fit puts the constant near zero, sharpening mercury clocks and EDM searches.
· “The hyperfine anomaly in mercury and test of the Moskowitz-Lombardi rule”
GERDA sees no neutrinoless double-beta decay in 82.4 kg·yr
Half-life limit tops 10^26 years, making GERDA the first search to reach that sensitivity.
Electron shake in 125I decay is 2.5 times predicted
High-resolution spectra also pin the 35.5-keV transition's penetration parameter at -1.2(6), a small negative anomaly.
· “High-resolution conversion electron spectroscopy of the 125I electron-capture decay”
First precise rates for rho0-plus-dimuon coincidences match LHC data
A percent-level coincident background is now calculable, and its ZDC and kinematic dependence matches measurement.
· “Modelling Coincident Particle Production in Ultraperipheral Heavy Ion Collisions”
Neural net sorts Hoyle decay branches with F1 up to 0.87
Training on simulated 2D track images, the net separates rare 12C decays from scattering backgrounds in a planned TPC.
Two heavy-ion runs disagree on the hypertriton's binding energy
Strange nuclei test the strong force in a few-body setting; new data may settle three open puzzles.
Nova reaction rate climbs 23% after underground re-measurement
Two low-energy resonances measure 1.5x stronger, lifting the 21Ne(p,γ)22Na rate in the nova range.
· “Improved direct measurement of low-energy resonances in the ²¹Ne(p,γ)²²Na reaction”
Most B_c mesons melt in the quark-gluon plasma
Transport model: recombination at low pT and fragmentation at high pT rebuild the LHC B_c yield.
Sapphire detector study finds stronger light-mediator limits
One year of reactor antineutrinos would also gauge the weak mixing angle to ~7% and probe neutrino magnetic moments at 10⁻¹¹ μ_B.
One effective theory unifies DIS and heavy-ion collisions
A review argues that saturated gluons tie electron-proton scattering to the quark-gluon plasma's birth.
Tracking errors shift phi spin alignment by less than 0.0005
Simulation says resolution shifts stay under 0.0005, inside the ~0.001 uncertainty of current measurements.
· “Impact of Tracking Resolutions on φ-Meson Spin Alignment Measurement”
Photons from jets now have complete perturbative kernels
Two single-scattering kernels add photon channels to parton energy loss, including flavor and coherence effects.
Electronic bridge could boost 229Th nuclear excitation 5-million-fold
Resonant electron levels in Th+ let two laser steps drive the 8.4 eV nuclear transition, and may explain the isomer's short lifetime.
· “Resonance nuclear excitation of the ²²⁹Th nucleus via electronic bridge process in Th~II”
No paired data needed to map simulated tracks to real detector noise
The trick: decode each event's latent with the other domain's diffusion model.
· “Unpaired Translation of Point Clouds for Modeling Detector Response”
Relativistic nuclear force matches standard accuracy at lower order
Covariant chiral force reproduces NN scattering to 200 MeV with fast convergence, aiding ab initio nuclear theory.
· “Relativistic chiral nuclear forces: status and prospects”
Photon data can confirm proton-neutron dominance in nuclei
Two cross-section ratios also test whether a photon's hard hit cleanly separates from nuclear structure.
· “Observing short-range correlations in nuclei through rho⁰ photo-production”
One code now automates NLO QCD for proton-nucleus collisions
Extension of MadGraph5_aMC@NLO validates on pPb W/Z and pion-tungsten Drell-Yan, with automatic uncertainties.
· “Automated NLO calculations for asymmetric hadron-hadron collisions in MadGraph5_aMC@NLO”
Ground and isomeric nuclei end up in different ion charge states
Fission-fragment thermalization in helium shows yield ratios varying between isotopes and nuclear isomers, beyond known isotope effects.
· “Anomalous nuclear effects on ion charge state distribution in helium gas”
Antiprotonic calcium x-rays could reveal the isovector force term
One-electronvolt shifts would fix the isovector parameter and aid neutron-antineutron oscillation searches.
Gallium solar-neutrino cross sections: 8B and hep up ~10%
Updated theory raises the gallium detectors' high-energy response and halves the old uncertainty.
· “The Gallium Solar Neutrino Capture Cross Section Revisited”
187Ta isomer's decays finally seen: 136-second life
The decay paths reveal a K ≥ 35/2 prolate isomer, a test for the predicted shape transition near A = 190.
· “Direct observation of β and γ decay from a high-spin long-lived isomer in ¹⁸⁷Ta”
6H ground state pinned at 2.3 MeV by electron scattering
Triple-coincidence missing-mass data favor the low-energy measurements and challenge multi-neutron interaction models.
· “Measurement of rm ⁶H ground state energy in an electron scattering experiment at MAMI-A1”
Sustained software funding is vital for nuclear physics
A community workshop argues short-term grants waste the payoff from supercomputers, data, and skilled software staff.
· “White Paper on Software Infrastructure for Advanced Nuclear Physics Computing”
QCD sum rules close the mirror-nucleus energy gap
A charge-symmetry-breaking force from QCD constants reproduces the Okamoto-Nolen-Schiffer anomaly without fitting.
One fermionic hierarchy yields all nuclear models
Ab initio, density-functional, and beyond-mean-field nuclear methods become controlled truncations of one equation-of-motion hierarchy.
New best limits on rare tri-nucleon decays: 1.83e26 yr
Full Majorana Demonstrator data push three-nucleon decay lifetimes beyond 10^26 years.
· “Rare multi-nucleon decays with the full data sets of the Majorana Demonstrator”
Lifetime measurement identifies mixed-symmetry state of 132Te
The measured 0.92 ps lifetime gives B(M1) = 0.18(2), settling the identity of the second 2+ state.
· “Isolated one-phonon mixed-symmetry 2+ state of the radioactive neutron-rich nuclide 132Te”
Elliptic anisotropy stays positive up to 100 GeV in Pb+Pb collisions
New ATLAS data link the shape of the quark-gluon plasma to jet energy loss up to 100 GeV.
ALICE J/psi photoproduction data favor gluon saturation in nuclei
These probes reach x ~ 10^-6, and Run 3/4 will cut the nuclear suppression uncertainty to about 4%.
· “Recent ALICE results relevant for PDFs at low and high-x, saturation”
149Tm is first proton-unbound thulium isotope
Weighing 149Tm, 150Tm and 149Er fixes the Z=69 drip-line at N=80 and tests mass models.
Dileptons track the QGP temperature
Selection on dilepton mass and momentum maps QGP temperatures from late times to under 1 fm/c.
· “Effective temperatures of the QGP from thermal photon and dilepton production”
Strangeness data overturn the old proton-collision picture
Review says multiplicity-dependent strange-baryon excesses leave no viable model without final-state interactions.
· “Soft QCD Physics at the LHC: highlights and opportunities”
One boson coupling controls 68As beta-decay predictions
Mapped IBM reproduces half-life trends across Ge, As, Zr, Mo; higher-order operator terms shift results only 5–10%.
Molecule picture survives X(3872) production test
Prompt rates match when the cutoff is the force range, not the tiny binding momentum — the old 1000x gap closes.
· “Production of exotic hadrons in pp and nuclear collisions”
New study extends 37K level scheme to a 13/2− state
High-momentum-loss reactions reveal negative-parity states and mirror-energy differences vs 37Ar.
· “In-beam γ-ray spectroscopy of negative-parity states of ³⁷K populated in dissipative reactions”
124Xe double electron capture half-life measured at 10^22 yr
A 1.73 tonne-year run finds 549 signal events, sharpening the nuclear theory benchmark for electron capture decay.
· “Measurement of two-neutrino double electron capture half-life of ¹²⁴Xe with PandaX-4T”
First data-driven value for the nucleon D-term: -3.38
Dispersion relations set the nucleon's gluonic radius at 0.97 fm, wider than the proton charge radius.
· “Dispersive Determination of Nucleon Gravitational Form Factors”
Symmetry energy softens sharply near twice nuclear density
A tuned sigma-delta mixing term lets one model family match PREX-2, NICER, and GW170817 at the same time.
A single exponential captures jet energy correlator data at all angles
A TMD-inspired non-perturbative model plus medium broadening reproduces CMS, ALICE and pPb measurements.
· “Energy-Energy Correlator for jet production in pp and pA collisions”
20Ne's measured shape breaks the rotor model by 3σ
A new precise quadrupole-moment measurement points to missing alpha-cluster physics in today's nuclear theories.
Thallium-205 half-life measured: 291 days
A storage-ring measurement of fully ionized 205Tl fixes 205Pb production in AGB stars and backs the Sun's birth-cloud picture.
· “High-temperature ²⁰⁵Tl decay clarifies ²⁰⁵Pb dating in early Solar System”
First polarized-Compton run pins down proton spin polarizabilities
New polarized Compton data in the Delta(1232) region give four spin polarizabilities with improved errors.
· “Spin polarizabilities of the proton by measurement of Compton double-polarization observables”
Global hyperon polarization is consistent with zero at LHC
Null result at 2.76 and 5.02 TeV extends the RHIC-to-LHC drop and tests vorticity-driven spin alignment.
· “Global polarization of Λ and overline{Λ} hyperons in Pb-Pb collisions at the LHC”
Lattice QCD reproduces the nucleon axial charge: 1.286(23)
Sea-quark loops at physical pion masses settle the long-standing benchmark and fix the nucleon's quark content.
· “Nucleon axial, tensor and scalar charges and σ-terms in lattice QCD”
Color transparency would bend a nuclear ratio by 2–3x
A measurable shift in antiproton-deuteron two-pion production would test QCD's small-size quark configurations.
Five parameters fit nucleon form factors once the rho pole is dropped
An explicit two-pion continuum replaces the rho and leaves one intrinsic scale, about 0.46 fm as a core radius.
Underlying event extends beyond the usual transverse region
PYTHIA shows the same wide underlying-event window and stable Tsallis parameters from 62.4 GeV to 13 TeV.
χ_b0 decays may reveal the gluon's hidden linear polarization
An azimuthal angle between the two pion pairs carries the signal at the percent level—within reach of current data.
· “Probing Gluon Linear Polarization with Dihadron Fragmentation in chi_b Decays”
Proton-to-pion ratios bound freeze-out fireball vorticity
Rotating hadron gas model reads LHC data as vorticity near 0.03 GeV central and 0.09 GeV peripheral.
· “Probing vorticity and fluctuations in a rotating hadron resonance gas at LHC energy”
Triangular counters hit 1.5 mm resolution from 20 mm fibers
Photoelectron sharing between adjacent counters beats raw fiber spacing by an order of magnitude.
Heavy-ion data measure baryon susceptibility along freeze-out
A Bayesian inversion of proton fluctuation data pins the baryon susceptibility to 5-10% and agrees with lattice QCD up to 300 MeV.
· “Extraction of baryon number susceptibilities at finite density from heavy-ion collisions”
Gaussian process puts error bars on the nuclear equation of state
Correlated uncertainties flow from six chiral-interaction calculations to saturation, symmetry energy, and crust-core properties.
Nanosecond isomers flag the onset of octupole collectivity
The lifetime pattern in odd-mass nuclei separates octupole-soft regions from static octupole deformation.
· “Long-lived opposite-parity states and the onset of octupole collectivity in atomic nuclei”
Spin probe of deuteron breakup stays positive to 680 MeV
Tensor analyzing power T20 falls from 0.65 to 0.35, matching meson-baryon calculations.
· “Tensor analyzing power T₂₀ in the reaction γ vec{d}to pn at photon energies 350-680 MeV”
A 3.55 m ring could reach electron-EDM sensitivity of 5.8e-30 ecm
Spin-transparent rings cancel magnetic-dipole precession so EDM and axion signals accumulate at any beam energy.
QCD predicts pion and kaon interiors with no free parameters
Theory says glue fractions match and strange quarks shift 20 percent; upcoming data can settle it.
Three-body recombination may turn Ba2+ into Ba+ in milliseconds
If true, barium-tagging systems in NEXT must track an evolving charge state, not a fixed Ba2+ ion.
Electron-capture branch of 76As measured at 0.0572%
First fully quantified result, ~70% above the previous value, sharpening the 76Ge double-beta-decay benchmarks.
· “Measurement of the Electron capture of ⁷⁶As into the first excited state of ⁷⁶Ge”
Airborne detector catches nearly 100 TGFs and new flickering flashes
iSTORM's 32 CeBr3 crystals cover 250 keV to 5 MeV from the ER-2 and spot a new storm phenomenon.
· “The iSTORM Instrument for Airborne Measurements of Gamma-Ray Emissions from Thunderstorms”
26P predicted strongest proton-halo signature
Knockout theory says a narrow 2s1/2 momentum peak separates 26P, 27S, 31Ar.
· “Momentum Distributions and Spatial Signatures of Proton Halos in the sd Shell”
Acceptance times luminosity is what makes SBS uniquely capable
With first runs complete, the program targets nucleon form factors, TMDs, and GPD tests up to Q2 about 10 (GeV/c)2.
Laser-cooled 137BaF targets sub-0.1% parity-violation precision
A full slowing-to-detection toolbox projects ~100x better sensitivity than molecular beams and first access to 19F.
Lifetime, not centrality, controls resonance survival
In Au+Au collisions at 19.6 and 200 GeV, the reconstructable fraction of short-lived resonances is ordered by intrinsic lifetime.
Complex-plane zeros alone reproduce the QCD crossover line
The curvature emerges from the zeros without inputting the known real-axis result
· “QCD Chiral Crossover Line from Lee-Yang Edge Singularities”
Neural operator returns tokamak equilibria in 2.8 ms at 0.05% error
It recovers X-points to 0.2 cm and the O-point to 0.03 cm, so speed-critical loops can afford full equilibrium calls.
