Fri·Apr 25, 2025Friday·April 25, 2025

1. 01*

   Charge Radii Measurements of Exotic Tin Isotopes in the Proximity of $N=50$ and $N=82$

   F.P. Gustafsson🇨🇭 · L. V. Rodríguez🇩🇪 · R.F. Garcia Ruiz🇺🇸 · T. Miyagi🇩🇪 · S.W. Bai🇨🇳 · D.L. Balabanski🇷🇴 · C.L. Binnersley🇬🇧 · M.L. Bissell🇬🇧 · K. Blaum🇩🇪 · B. Cheal🇬🇧 · T.E. Cocolios🇧🇪 · G.J. Farooq-Smith🇧🇪 and 42 other authors

   We report nuclear charge radii for the isotopes ${}^{104-134}$Sn, measured using two different collinear laser spectroscopy techniques at ISOLDE-CERN. These measurements clarify the arch-like trend in charge radii along the isotopic chain and reveal an odd-even staggering that is more pronounced near the $N=50$ and $N=82$ shell closures. The observed local trends are well described by both nuclear density functional theory and valence space in-medium similarity renormalization group calculations. Both theories predict appreciable contributions from beyond-mean-field correlations to the charge radii of the neutron-deficient tin isotopes. The models, however, fall short of reproducing the magnitude of the known $B(E2)$ transition probabilities, highlighting the remaining challenges in achieving a unified description of both ground-state properties and collective phenomena.

   nucl-exnucl-thPRL(2025)·22 citations
2. 02*

   Investigation of the Excited States of ${}^{114}\mathrm{Sn}$ Using the GRIFFIN Spectrometer at TRIUMF

   N. K. Syeda🇨🇦 · P. Spagnoletti🇨🇦 · C. Andreoiu🇨🇦 · C.M. Petrache🇫🇷 · D. Annen🇨🇦 · R.S. Lubna🇨🇦 · V. Vedia🇪🇸 · A. Algora🇪🇸 · A. Babuf · G.C. Ball🇨🇦 · S. Bhattacharjee🇨🇦 · R. Caballero-Folch🇨🇦 and 34 other authors

   The semi-magic ${}^{110-122}\mathrm{Sn}$ isotopes display signs of shape coexistence in their excited $0^{+}$ states, which, in contrast to the spherical $0^{+}$ ground states, are deformed. This paper investigates the nuclear structure of ${}^{114}\mathrm{Sn}$ using the competing ${\beta }^{+}$ decay and electron capture of a radioactive beam of ${}^{114}\mathrm{Sb}$ produced at the TRIUMF-ISAC facility using the GRIFFIN spectrometer. This study will allow for an in-depth understanding of the excited $0^{+}$ states in ${}^{114}\mathrm{Sn}$, by focusing on their decay patterns. In the present experiment, transitions at 856.2-keV and 1405.0-keV, which were observed in an earlier ${\beta }^{+}$ decay study but not placed in the ${}^{114}\mathrm{Sn}$ level scheme, have been assigned to the level scheme in connection to the $0_3^{+}$ level at 2156.0-keV. Properly assigning these transitions refines the level scheme and enhances our understanding of the nuclear structure in ${}^{114}\mathrm{Sn}$.

   nucl-exNPA(2025)·1 citation
3. 03*

   Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q${}^2$

   Y.P. Zhang · Z.H. Ye🇨🇳 · D. Nguyen🇺🇸 · P. Aguilera🇫🇷 · Z. Ahmed🇺🇸 · H. Albataineh🇺🇸 · K. Allada🇺🇸 · B. Anderson🇺🇸 · D. Anez🇨🇦 · K. Aniol🇺🇸 · J. Annand🇬🇧 · J. Arrington🇺🇸 and 87 other authors

   We present results from the Jefferson Lab E08-014 experiment, investigating short-range correlations (SRC) through measurements of inclusive quasi-elastic scattering from ${}^2$H, ${}^3$He, ${}^4$He, ${}^{12}$C, ${}^{40}$Ca, and ${}^{48}$Ca. The kinematics were selected to isolate scattering from SRCs, yielding a plateau in the A/${}^2$H cross-section ratios due to the universal two-body structure of the 2N-SRCs in light and heavy nuclei. We observe approximate plateaus in the A/${}^2$H ratios and provide the first extractions of the A/${}^2$H ratio for ${}^{40}$Ca and ${}^{48}$Ca. We also examine the A/${}^3$He ratio, aiming to identify three-nucleon SRCs (3N-SRCs). Following the approach for isolating 2N-SRCs, searching for 3N-SRC dominance involved measuring the A/${}^3$He cross section ratio at modest-to-large $Q^2$ values and looking for a plateau ratios for $x\text{gtorder}2.5$. This was not observed in the data, and in fact increasing $Q^2$ values moved the data \textit{further away} from the predicted plateau. We show here that, when analyzed in terms of the struck nucleon's light-cone momentum, the data exhibited the expected trend, progressively approaching the predicted 3N-SRC plateau. These observations suggest that future measurements at higher energies may facilitate a definitive isolation and identification of 3N-SRCs.

   nucl-exhep-phPLB(2026)·7 citations
4. 04*

   Evidence for neutron-induced $\mathbf{\gamma }$-ray emissions in the vicinity of the $\mathbf{Q}$ value of ${}^{76}\text{Ge}$ $0\nu \beta \beta$ decay

   Marie Pichotta🇩🇪 · Toralf Döring🇩🇪 · Hans Fritz Rudolf Hoffmann🇩🇪 · Konrad Schmidt🇩🇪 · Ronald Schwengner🇩🇪 · Steffen Turkat🇩🇪 · Birgit Zatschler🇩🇪 · Kai Zuber🇩🇪

   Neutrinoless double-beta decay of nuclei represents one of the most promising methods for uncovering physics beyond the Standard Model. In this context, ${}^{76}$Ge stands out as a particularly attractive candidate, as it can serve as an intrinsic component in semiconductor detectors. If the neutrinoless process occurs in ${}^{76}$Ge, its signature would appear as a distinct peak at the $Q$ value of 2039 keV. A neutron activation measurement was performed on a germanium sample isotopically enriched in ${}^{76}$Ge at the DT neutron generator of TU Dresden. The measurement confirmed the presence of $\gamma$ rays with energies of 2033.1$\pm$0.5 keV, 2035.5$\pm$0.4 keV, and 2040.22$\pm$0.26 keV originating from the decays of ${}^{74}$Ga and ${}^{76}$Ga. These $\gamma$ rays lie in close proximity to the expected neutrinoless double-beta decay signal of ${}^{76}$Ge.

   nucl-exPRC(2025)·0 citations
5. 05*

   Measurement of the Parity-Violating Asymmetry in the N to $\Delta$ Transition at Low $Q^2$

   D. Adhikari · T. Alshayeb · D. Androic · D.S. Armstrong · A. Asaturyan · K. Bartlett · R.S. Beminiwattha · J. Benesch · F. Benmokhtar · R.D. Carlini · J.C. Cornejo · S. Covrig Dusa and 61 other authors

   We report the measurement of the parity-violating asymmetry in the N to $\Delta$ transition via the $e^{-}+p\to e^{-}+{\Delta }^{+}$ reaction at two different kinematic points with low four-momentum transfer Q${}^2$. Measurements were made with incident electron beam energies of 0.877 and 1.16 GeV, corresponding to $Q^2$ values of 0.0111 and 0.0208 (GeV/c)${}^2$, respectively. These measurements put constraints on a low-energy constant in the weak Lagrangian, $d_{\Delta }$, corresponding to a parity-violating electric-dipole transition matrix element. This matrix element has been shown to be large in the strangeness-changing channel, via weak hyperon decays such as ${\Sigma }^{+}\to p\gamma$. The measurements reported here constrain $d_{\Delta }$ in the strangeness-conserving channel. The final asymmetries were -0.65 +- 1.00 (stat.) +- 1.02 (syst) ppm (parts per million) for 0.877 GeV and -3.59 +- 0.82 (stat.) +- 1.33 (syst.} ppm for 1.16 GeV. With these results we deduce a small value for $d_{\Delta }$, consistent with zero, in the strangeness-conserving channel, in contrast to the large value for $d_{\Delta }$ previously reported in the strangeness-changing channel.

   nucl-exPRC(2025)·0 citations
6. 06*

   A physics-embedded Bayesian neural network for predicting the energy dependence of fission product yields with fine structures

   Jingde Chen🇨🇳 · Yuta Mukobara🇮🇹 · Kazuki Fujio · Satoshi Chiba🇯🇵 · Tatsuya Katabuchi · Chikako Ishizuka🇯🇵

   We present a physics-embedded Bayesian neural network (PE-BNN) framework that integrates fission product yields (FPYs) with prior nuclear physics knowledge to predict energy-dependent FPY data with fine structure. By incorporating an energy-independent phenomenological shell factor as a single input feature, the PE-BNN captures both fine structures and global energy trends. The combination of this physics-informed input with hyperparameter optimization via the Watanabe-Akaike Information Criterion (WAIC) significantly enhances predictive performance. Our results demonstrate that the PE-BNN framework is well-suited for target observables with systematic features that can be embedded as model inputs, achieving close agreement with known shell effects and prompt neutron multiplicities.

   ↳ nucl-thnucl-exphysics.data-anPRC(2026)·0 citations
7. 07*

   Exploring the giant monopole resonance in superheavy nuclei: A theoretical perspective

   S. Kumar🇮🇳 · Jeet Amrit Pattnaik🇮🇳 · S. K. Singh🇮🇳 · R. N. Panda🇮🇳 · M. Bhuyan🇮🇳 · S. K. Patra🇮🇳

   Within the relativistic mean field framework, in an extended Thomas-Fermi approximation, we calculate the binding energy and charge distribution radius for the latest superheavy nuclei, synthesised in various laboratories, with atomic numbers $Z=110-118$. The binding energy and radii are compared with the results obtained from relativistic Hartree calculations along with the experimental data, wherever available, to check the reliability of the methods. The calculations are extended to estimate the giant monopole resonances to understand the collective vibration of the nucleons for such superheavy nuclei. The giant monopole resonances obtained from scaling calculations are compared with the constraint computations. Furthermore, the results are compared with other known methods, such as the relativistic Random Phase Approximation (RPA) and time-dependent mean field calculations, along with some known lighter nuclei, specifically Zr isotopes (N = 42-86) and O isotopes (N = 10-36). Finally, the nuclear compressibility of the superheavy nuclei is predicted from the energy obtained in the breathing mode.

   ↳ nucl-thnucl-exPhys.Part.Nucl.Lett.(2026)·0 citations
8. 08*

   Directed and elliptic flow of light nuclei and hypernuclei in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=3$ GeV: Coalescence vs. Statistical Fragmentation

   Tom Reichert🇩🇪 · Manjunath Omana Kuttan🇩🇪 · Apiwit Kittiratpattana🇹🇭 · Nihal Buyukcizmeci🇹🇷 · Alexander Botvina🇩🇪 · Jan Steinheimer🇩🇪 · Marcus Bleicher🇩🇪

   The harmonic flow coefficients of light nuclei and hypernuclei in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=3$ GeV are investigated using the Ultra-relativistic Quantum Molecular Dynamics transport model. For the Equation-of-State we employ a density and momentum dependent potential from the Chiral-Mean-Field model. Light nuclei and hypernuclei production is described at kinetic freeze-out via a coalescence mechanism or with a statistical multi-fragmentation calculation. The directed flow $v_1$ of p, d, t, ${}^3$He, ${}^4$He as well as the $\Lambda$, ${}_{\Lambda }^3$H and ${}_{\Lambda }^4$H is shown to approximately scale with mass number $A$ of the light cluster in both calculations. This is in agreement with the experimental results for the directed flow measured by STAR. Predictions for the directed and elliptic flow of (hyper)nuclei at further RHIC-FXT and FAIR energies show that the scaling properties should improve as the beam energy is increased.

   ↳ nucl-thnucl-exPRC(2025)·5 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.