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Open research questions in Nuclear physics research studies

37 unresolved questions extracted from the limitations and future-work sections of 617 Nuclear physics research studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • This document resolves two open problems of the Projective Dynamic Logo (PDL) programme: OP13 (derivation of the spin-orbit splitting from axioms C1–C4) and OP14 (derivation of the sub-shell filling rates governing the valley of nuclear stability).

    The Filling-Rate Table of D40 Vindicated, an Equation Error Corrected, and the Simplified Rule of D47v1 Refuted · 2026 · DOI

  • In conjunction with the polarized deuteron beams provided by the polarized ion source at RIKEN, the system enables measurement of the spin correlation coefficients—for which data remain scarce—along with the deuteron and proton analyzing powers in d – p elastic scattering.

    New measurement system for the spin correlation coefficients in deuteron–proton elastic scattering · 2026 · DOI

  • Based on the CPPM framework, we successfully predicted the [Formula: see text] decay half-lives of 14 candidate nuclei (Z=118, 120), providing a significant theoretical foundation and reference for further research on the [Formula: see text] decay of superheavy nucleus.

    Systematic study of proximity potential models for α-decay half-lives in superheavy nuclei within the CPPM framework · 2026 · DOI

  • The result is treated as an empirically significant test case in which the standard counting description is insufficient, while a controlled analysis requires a null model, an operator residual, a shell-channel compatibility matrix, non-closure and closure estimators, and a PASS/FAIL procedure.

    Shell Selection of Proton–Neutron Pairing as a Nuclear Anchor of the Relational Interpretation of USC. BKT-31 · 2026 · DOI

  • Three open problems are declared: derivation of E_N from TT-DAV invariants without external anchor (N-1a), extension to heavier nuclei (N-1b), and a priori derivation of the inter-domain link coefficient e = φ⁴ + δ_I (N-1c).

    TT-DAV Framework — Working Note N-1 · 2026 · DOI

  • Because the three directions are equivalent, it is a natural alternative to present the shapes as spanning representations of the permutation group of the three coordinate axes, denoted S xyz cannot change the degree of an expression, so one is limited to the small subspaces of shapes of the same degree, further reduced by grouping wave functions belonging to the blocks Ik, according to the analysis above.

    Bosonic content of three-fermion highest-spin states · 2026 · DOI

  • Over the past two decades, studies of the migration of magic numbers have been significantly extended to extremely neutron- rich systems, primarily through the in-beam γ-ray spectroscopy following the knockout reactions. Neutron-rich N = 20 and 28 nuclei are flagship cases of the disappearance of canonical magic numbers in the Segré chart, forming an extended region of deformation by merging two IOIs. It should be emphasized that excited 0+ states are bandheads of unfavored configurations and are key for understanding the competition between shell gaps and many-body correlations. However, for many nuclei within the IOI, such as 30, 32Ne, 34,36,38Mg, the locations of the 0+ 2 states remain unknown. This is primarily because these low-lying 0+ 2 states often do not decay via γ transitions, requiring particle detection to determine their excitation energies. The STRASSE system [93], consisting of a thick LH2 target and a silicon tracker, has been developed to perform simultaneous in-beam γ and missing-mass spectroscopy at the RIBF, offering a unique opportunity to study these states. While the emergence of the new N = 32 and 34 magic numbers is well established in the Ca region, their evolution below Z = 18 towards more neutron-rich systems remains an open question. The nucleus 48S (Z = 16, N = 32) involves two spin-orbit splitting subshells. Its first in-beam γ-ray spectroscopy would offer key information about the shell evolution in this region. Looking ahead, next-generation RI-beam facilities will further advance these studies. Following the planned upgrade of the RIBF, a new scintillator array, HYPATIA [94], comprising about one thousand HR-GAGG (Ce) and CeBr3 detectors, is under construction. With the 2 pμA238U primary beam at the upgraded RIBF, HYPATIA will enable the γ-ray spectroscopy of extremely exotic nuclei such as 60Ca using (p, 2p) reactions with secondary-beam intensities at the level of ∼ 1 pps [95]. Notably, the HIAF facility in China is entering the commissioning phase. Its high beam energy, ranging from several hundred MeV/u to a few GeV/u, will increase the fraction of fully stripped heavy ions, offering an excellent platform to study shell evolution via knockout reactions in the heavier mass region, such as the structure of neutron-rich N = 126 nuclei. A thick liquid hydrogen target dedicated to such studies at HIAF is now under construction. The stage is set for continued fruitful advances in understanding exotic nuclear structure.

    Exploring the migration of magic numbers in neutron-rich systems via knockout reactions · 2026 · DOI

  • The current local optical-model analysis focuses on elastic scattering data fitting but does not systematically quantify how well the derived potential parameters predict reaction cross-sections (inelastic scattering, breakup, or transfer) for deuteron-induced reactions on 3He to 16O. Validation against independent reaction channel data is needed to confirm the physical meaningfulness of the nucleus-specific potentials.

    Optical model for deuteron-induced elastic scattering on light nuclei from 3He to 16O · 2026 · DOI

  • The phenomenological optical-model analysis demonstrates that nucleus-specific and energy-variable fit potentials outperform global parameterizations, but the physical basis for the systematic variation in imaginary potential components across the isotopic chain from 3He to 16O has not been fully elucidated. Future dedicated studies should correlate these potential variations with specific nuclear structure features and reaction mechanisms for each target nucleus.

    Optical model for deuteron-induced elastic scattering on light nuclei from 3He to 16O · 2026 · DOI

  • The Woods-Saxon potential description successfully describes central potential parameters across 3He to 16O, but the slightly larger diffuseness observed in weakly bound and cluster-like nuclei requires systematic investigation of how surface absorption and volume absorption components vary with nuclear structure. This should be formalized with extended nuclear-structure-dependent parameterizations beyond the current phenomenological approach.

    Optical model for deuteron-induced elastic scattering on light nuclei from 3He to 16O · 2026 · DOI

  • Global optical model potentials with fixed mass and energy dependent parameterizations fail to capture nucleus-specific reaction mechanisms such as deuteron breakup, transfer, and cluster effects in lithium-, beryllium-, and boron-isotopes. Future work should develop explicit channel coupling treatments that quantitatively account for these inelastic processes in light nuclei optical-model analysis across the 3He to 16O range.

    Optical model for deuteron-induced elastic scattering on light nuclei from 3He to 16O · 2026 · DOI

  • The systematic treatment of single escape peak contributions (31% for 1763 keV, 4.1% for 1951 keV in the dysprosium measurement) lacks detailed methodology documentation. A comprehensive procedure for identifying and correcting single and double escape peaks across the full energy range of prompt gamma-ray measurements on lanthanide elements requires establishment.

    Prompt gamma rays from the inelastic scattering of fission neutrons on samarium and dysprosium · 2026 · DOI

  • The partial cross sections for gamma-ray production from (n,n′γ) and (n,γ) reactions on samarium and dysprosium isotopes lack direct comparison with theoretical predictions from nuclear structure models or evaluated nuclear data libraries. Validation of the measured fission-neutron spectrum-averaged partial cross sections against ENDF/JEFF database values for all 140 samarium and 148 dysprosium lines would establish systematic uncertainties.

    Prompt gamma rays from the inelastic scattering of fission neutrons on samarium and dysprosium · 2026 · DOI

  • Unresolved gamma-ray doublets are noted at multiple energy levels (e.g., 308 and 311 keV, 980 and 983 keV, 1554 and 1556 keV, 1582 and 1586 keV) in the samarium and dysprosium inelastic scattering spectra. High-resolution spectroscopy measurements or theoretical calculations of transition strengths for these specific doublets are needed to resolve individual isotopic contributions to the observed prompt gamma-ray lines.

    Prompt gamma rays from the inelastic scattering of fission neutrons on samarium and dysprosium · 2026 · DOI

  • The detection limit for dysprosium (1.6 mg) is significantly higher than for samarium (0.6 mg) when using the 184.8 keV line of 162Dy. This performance gap due to competing radiative capture contributions in 162Dy and 164Dy requires investigation of alternative gamma-ray lines or isotopes to improve the detection sensitivity for dysprosium in prompt gamma-ray analysis with fission neutrons.

    Prompt gamma rays from the inelastic scattering of fission neutrons on samarium and dysprosium · 2026 · DOI

  • The correction procedures for (n,γ) neutron capture interferences in dysprosium gamma-ray measurements remain incomplete and inaccurate. The residual distribution shift from 0.82 ± 0.05 to 1.16 ± 0.10 after corrections indicates systematic errors in the interference accounting methodology that require refinement of the correction algorithm for inelastic scattering measurements on dysprosium isotopes.

    Prompt gamma rays from the inelastic scattering of fission neutrons on samarium and dysprosium · 2026 · DOI

  • The calculations were performed with fixed heating efficiency parameters, but the actual heating efficiency in real astrophysical r-process events (neutron star mergers, core-collapse supernovae) remains observationally unconstrained. Connecting theoretical heating efficiency values used in reaction network calculations to observational constraints from kilonova electromagnetic signatures requires dedicated investigation.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • The effect of finite-temperature β-decay rates on energy release during the very early phase of nucleosynthesis (when baryon density is still high and NSE applies) is noted as potentially affecting temperature evolution, but this feedback mechanism between early-stage heating and subsequent abundance pattern modification has not been quantitatively characterized or validated against full hydrodynamical simulations.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • Nuclear heating efficiency was parameterized with only two values (ϵ = 0.5 and 1.0) and showed small differences, but the study lacks systematic investigation of how varying heating efficiency across the broader range (0 < ϵ < 1) affects final abundance patterns, particularly for the rare-earth peak and third r-process peak regions in both MHD and ADM conditions.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • The study shows that finite-temperature β-decay rate effects are more pronounced in MHD conditions than ADM conditions because ADM trajectories remain in highly neutron-rich regions (Ye < 0.15) where temperature effects are minimal. The interaction between temperature-dependent β-decay rates and the specific electron fraction (Ye) evolution in different astrophysical environments requires systematic investigation across a broader range of neutron-richness conditions.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • The finite-temperature β-decay rates were calculated using only the FT-PNRQRPA framework for nuclei with 20 ≤ Z ≤ 60. The applicability and potential differences when using alternative theoretical frameworks for calculating temperature-dependent β-decay rates in this and adjacent mass regions, particularly for the rare-earth and third r-process peak regions, remains unexplored.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • The study assumes shock or viscous heating is not negligible and notes that careful subtraction of approximated nuclear heating from hydrodynamical simulations would be required to avoid double counting. However, the specific methodology for accurately quantifying and separating shock/viscous heating contributions from nuclear reheating in r-process nucleosynthesis calculations has not been developed or tested across different astrophysical scenarios.

    Effect of Finite-temperature <i>β</i> -decay Rates on the Rapid Neutron Capture Process · 2026 · DOI

  • Ongoing developments aim to implement the nuclear structure model through the deformed Quasi-particle Random Phase Approximation (QRPA) to generate the microscopic optical potential to describe the pairing and deformation targets.

    Collective excited states at small amplitude in neutron elastic scattering at low-energies · 2026 · DOI

  • Recent studies have performed to address nucleon scattering off nuclei with pairing correlations by employing the Jost function formalism based on the Hartree-Fock-Bogoliubov (HFB) theory, but this remains an active area requiring further development.

    Collective excited states at small amplitude in neutron elastic scattering at low-energies · 2026 · DOI

  • The MOP generated from nuclear structure model is primarily applicable to double closed shell target nuclei that are well described within the RPA, limiting applicability to other nuclear systems.

    Collective excited states at small amplitude in neutron elastic scattering at low-energies · 2026 · DOI

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37 open questions have been extracted from the limitations and future-work passages of 617 Nuclear physics research studies papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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