PaperPanorama

Nuclear Experiment·nucl-ex

Tue·Aug 11, 2026

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 01

    High Precision Fundamental Physics Experiments at JLab with Spin-transparent Storage Rings of Low-energy Polarized Electron Beams

    Vladimir Khachatryan · Riad Suleiman · Alberto Accardi · Carlos Ayerbe Gayoso · Marco Battaglieri · Devesh Bhattarai · Silviu Covrig Dusa · Yaroslav Derbenev · Forrest Friesen · Joseph Grames · Paul Guèye · Tyler J. Hague and 17 other authors

    A breakthrough in fundamental physics experiments measuring particle spin precession may happen if spin-transparent storage rings become adopted tools for such experiments. We present a new design of highly specialized table-sized storage rings, which use low-energy polarized electron beams and Mott polarimetry. Based on the spin transparency ansatz, the spin precession stemming from the magnetic dipole moment is canceled at any beam energy after an electron's turn along the periodic orbit in the ring. Meanwhile, a spin precession induced by the fundamental physics of interest, e.g., the electron's permanent electric dipole moment (EDM) and/or ultralight-dark-matter-mediated forces such as axions, will accumulate. However, capitalizing on such types of rings is not only desirable for measurements of EDMs and axion searches relevant to violation and matter-antimatter asymmetry in the Universe, but may also find very promising applications in quantum computing.

    nucl-exhep-phhep-thphysics.acc-ph+10 citations
  2. 02

    Tensor analyzing power in the reaction at photon energies 350-680 MeV

    V. V. Gauzshtein · A. I. Fix🇷🇺 · V. I. Ivanov · D. M. Nikolenko · I. A. Rachek · Yu. V. Shestakov · D. K. Toporkov · A. V. Yurchenko · S. A. Zevakov · G. N. Baranov · A. V. Bogomyagkov🇷🇺 · V. M. Borin and 21 other authors

    We present measurements of the tensor analyzing power in the reaction at photon energies -~MeV. The experiment was performed at the VEPP-3 storage ring using an internal tensor-polarized deuterium gas target and a tagged quasi-real photon beam. The data were obtained for proton emission angles -. Comparison with modern meson-baryon calculations shows generally satisfactory agreement within the present uncertainties. A theoretical analysis of an extended data set, covering the energy range from threshold to 680~MeV and including both the new data and the previous results from 2007, is presented.

    nucl-ex0 citations
  3. 03

    Alpha Particle Induced Collision Cascade Fusion

    Sandeep Puri · Noah D'Amico · Andrew Gillespie · Ian Jones · Cuikun Lin🇺🇸 · Bo Zhao · R. V. Duncan

    We report experimental and computational investigations of a collision-cascade mechanism to induce deuterium-deuterium (D-D) fusion. Evidence of neutron production was observed from a pressurized deuterium target exposed to energetic alpha particles emitted by a source. A 5-mCi alpha source was placed within a chamber containing pressurized deuterium gas, and neutron emission was monitored for 18 h using two Mirion SN-S neutron detectors. Alpha particles incident on pressurized deuterium gas produced an average excess of 74 neutrons after background subtraction, corresponding to a fusion neutron rate of 2.24 n/s. With LiD in the pressurized deuterium, the average excess increased to 268 neutrons, corresponding to 8.1 n/s. Since D-D fusion branches into two equally likely pathways, these correspond to a fusion rate near 4.5 and 16.2 fusions per second, respectively. MCNP simulations incorporating experimental geometry, source activity, and detector configuration predicted neutron yields within 5.4% of the measured values and reproduced the detector response within experimental uncertainty. The tight agreement between measured and simulated neutron counts suggests that energetic alpha-particle interactions within the deuterium may contribute to measurable D-D fusion reactions through the D(d,n) channel.

    nucl-ex0 citations
  4. 04

    Quest for an Understanding of Pion and Kaon Structure

    Zhen-Ni Xu🇪🇸 · Daniele Binosi🇮🇹 · Craig D. Roberts🇨🇳 · José Rodríguez-Quintero🇪🇸

    The emergence of massless (Nambu-Goldstone) bosons in association with a dynamically global broken symmetry is a long known and widespread phenomenon in physics. However, practically nothing is known about the expressions of Nambu--Goldstone boson character on the internal structure of these bound states. Indeed, their structure is often ignored. In strong interactions, pions and kaons are the (would-be) Nambu-Goldstone bosons and experiments underway or planned at existing or anticipated high-energy, high-luminosity facilities will gather data that it is hoped will enable maps to be drawn of their internal structure. Meanwhile, theory and phenomenology find themselves in something of a quagmire. Herein, we provide a snapshot of the current status, highlighting issues under debate and identifying areas that deserve greater attention so that best use can be made of what is likely to be a huge volume of data delivered in the next decade or so.

    ↳ hep-phhep-exhep-latnucl-ex+11 citation
  5. 05

    Long-lived opposite-parity states and the onset of octupole collectivity in atomic nuclei

    Bui Minh Loc · Hoang Thai An · Nguyen Le Anh · Panagiota Papakonstantinou · Naftali Auerbach

    Octupole deformation in atomic nuclei is of interest for both nuclear structure and precision tests of fundamental symmetries, but identifying regions of octupole collectivity remains challenging. We analyze low-energy spectra of odd-mass nuclei and uncover a previously unrecognized empirical regularity that serves as a signature of octupole collectivity in neighboring even-even systems. The observed patterns, which can be understood within a core-coupling picture, are consistent with previous theoretical studies and lead to predictions for neutron-rich and proton-deficient nuclei. These findings provide a simple empirical guide for identifying promising candidates for future experiments and microscopic calculations.

    ↳ nucl-thnucl-ex0 citations
  6. 06

    A Gaussian Process framework for constraining the nuclear equation of state from microscopic calculations with correlated uncertainties

    Y. G. Lee · J. Kim🇰🇷 · T. Zhao🇨🇳 · C. Drischler🇺🇸

    We present constraints on the nuclear equation of state (EOS) from microscopic asymmetric matter calculations at zero temperature based on chiral nucleon-nucleon and three-nucleon interactions. The constraints include the saturation point, the isospin dependence of the incompressibility, and the symmetry energy, as well as the crust-core transition density of neutron-star matter. To quantify and propagate correlated uncertainties from noisy many-body calculations to derived observables, we introduce GPDiff, an efficient JAX-based Python package for multivariate Gaussian process (GP) regression with automatic differentiation. After training, GPDiff enables joint predictions of the EOS and derivatives of arbitrary order with respect to the input variables, including mixed partial derivatives. In this initial application, we analyze recent high-order many-body perturbation theory calculations of asymmetric matter up to about twice saturation density and explore nonstationary change-surface kernels, a class of input-dependent kernels, for modeling the EOS. GPDiff is broadly applicable to microscopic nuclear EOS calculations at zero and finite temperature and provides a versatile package for GP-based uncertainty quantification and inference of the nuclear EOS.

    ↳ nucl-thastro-ph.SRnucl-ex0 citations

Affiliations

first authorsco-authorsvia INSPIRE