Tue·Jun 11, 2024Tuesday·June 11, 2024

1. 01*

   High-precision measurements of the atomic mass and electron-capture decay $Q$ value of ${}^{95}$Tc

   Zhuang Ge🇫🇮 · Tommi Eronen🇫🇮 · Vasile Alin Sevestrean🇷🇴 · Ovidiu Niţescu🇷🇴 · Sabin Stoica🇷🇴 · Marlom Ramalho🇫🇮 · Jouni Suhonen🇫🇮 · Antoine de Roubin🇧🇪 · Dmitrii Nesterenko🇫🇮 · Anu Kankainen🇫🇮 · Pauline Ascher🇫🇷 · Samuel Ayet San Andres🇪🇸 and 16 other authors

   A direct measurement of the ground-state-to-ground-state electron-capture decay $Q$ value of ${}^{95}$Tc has been performed utilizing the double Penning trap mass spectrometer JYFLTRAP. The $Q$ value was determined to be 1695.92(13) keV by taking advantage of the high resolving power of the phase-imaging ion-cyclotron-resonance technique to resolve the low-lying isomeric state of ${}^{95}$Tc (excitation energy of 38.910(40) keV) from the ground state. The mass excess of ${}^{95}$Tc was measured to be $-$86015.95(18) keV/c${}^2$, exhibiting a precision of about 28 times higher and in agreement with the value from the newest Atomic Mass Evaluation (AME2020). Combined with the nuclear energy-level data for the decay-daughter ${}^{95}$Mo, two potential ultra-low $Q$-value transitions are identified for future long-term neutrino-mass determination experiments. The atomic self-consistent many-electron Dirac--Hartree--Fock--Slater method and the nuclear shell model have been used to predict the partial half-lives and energy-release distributions for the two transitions. The dominant correction terms related to those processes are considered, including the exchange and overlap corrections, and the shake-up and shake-off effects. The normalized distribution of the released energy in the electron-capture decay of ${}^{95}$Tc to excited states of ${}^{95}$Mo is compared to that of ${}^{163}$Ho currently being used for electron-neutrino-mass determination.

   nucl-exnucl-thPLB(2024)·7 citations
2. 02*

   Search for the Chiral Magnetic Effect using Sliding Dumbbell Method in Isobar Collisions (${}_{44}^{96}Ru$+${}_{44}^{96}Ru$ and ${}_{40}^{96}Zr$+${}_{40}^{96}Zr$) at RHIC

   Jagbir Singh🇮🇳

   Experiments conducted in the last decade to search for the Chiral Magnetic Effect (CME) in heavy-ion collisions have been inconclusive. The Isobar program at RHIC was undertaken to address this problem. Also, a new approach known as the Sliding Dumbbell Method (SDM) has been developed to study the CME. This method searches for the back-to-back charge separation on an event-by-event basis.

   nucl-exProceedings of the DAE Symp. on Nucl. Phy…·0 citations
3. 03*

   Decay Energy Spectrometry for Improved Nuclear Material Analysis at the IAEA NML

   G.B. Kim · A.R.L. Kavner🇺🇸 · T. Parsons-Davis🇺🇸 · S. Friedrich🇺🇸 · O.B. Drury · D. Lee · X. Zhang🇨🇳 · N. Hines🇺🇸 · S.T.P. Boyd🇺🇸 · S. Weidenbenner · K. Schreiber · S. Martinson and 8 other authors

   Decay energy spectrometry (DES) is a novel radiometric technique for high-precision analysis of nuclear materials. DES employs the unique thermal detection physics of cryogenic microcalorimeters with ultra-high energy resolution and 100$\%$ detection efficiency to accomplish high precision decay energy measurements. Low-activity nuclear samples of 1 Bq or less, and without chemical separation, are used to provide elemental and isotopic compositions in a single measurement. Isotopic ratio precisions of 1 ppm - 1,000 ppm (isotope dependent), which is close to that of the mass spectrometry, have been demonstrated in 12-hour DES measurements of ~5 Bq samples of certified reference materials of uranium (U) and plutonium (Pu). DES has very different systematic biases and uncertainties, as well as different sensitivities to nuclides, compared to mass-spectrometry techniques. Therefore, the accuracy and confidence of nuclear material assays can be improved by combining this new technique with existing mass-spectrometry techniques. Commercial-level DES techniques and equipment are being developed for the implementation of DES at the Nuclear Material Laboratory (NML) of International Atomic Energy Agency (IAEA) to provide complementary measurements to the existing technologies. The paper describes details of DES measurement methods, as well as DES precision and accuracy to U and Pu standard sources to discuss its capability in analysis of nuclear safeguards samples.

   ↳ physics.ins-detnucl-ex2 citations
4. 04*

   A General Track Fit based on Triplets

   Andre Schöning🇩🇪

   This paper presents a general three-dimensional track fit based on hit triplets. The general track fit considers spatial hit and multiple Coulomb scattering uncertainties, and can also be extended to include energy losses. Input to the fit are detector-specific triplet parameters, which contain information about the triplet geometry (hit positions), the radiation length of the material and the magnetic field. Since the solution is given by an analytical closed-form, it is possible to use the same fitting code for all kind of tracking detectors. Fitting formulas are given for the global track fit as well as for the local hit triplets. The latter allows filtering out triplets with poor fit quality at an early stage of track reconstruction. The construction and fit of local triplets is fully parallelizable, enabling accelerated computation with parallel hardware architectures. Formulas for the detector-specific triplet parameters are derived for the two most commonly used field configuration for tracking detectors, namely a uniform solenoidal field and gap spectrometer dipole. An algorithm to calculate the triplet parameters for an arbitrary magnetic field configuration is presented too. This paper also includes a discussion of inherent track fit biases. Furthermore, a new method is proposed to accelerate track fitting by classifying tracking regimes and using optimal fit formulas.

   ↳ physics.ins-dethep-exnucl-exphysics.data-anNucl.Instrum.Meth.A(2025)·3 citations
5. 05*

   High precision measurements of alpha_s at the future EIC

   T. Kutz🇺🇸 · J. R. Pybus🇺🇸 · D. W. Upton🇺🇸 · C. Cotton🇺🇸 · A. Deshpande🇺🇸 · A. Deur🇺🇸 · W.B. Li🇺🇸 · D. Nguyen🇺🇸 · M. Nycz🇺🇸 · X. Zheng🇺🇸

   We present a projection study for the first moments of the inclusive spin structure function for the proton and neutron from simulated doubly-polarized e+p and e+3He collision data expected from the Electron-Ion collider. For detection and extraction of the neutron spin asymmetries from e+3He collisions, we used the double-tagging method which significantly reduces the uncertainty over the traditional inclusive method. Using the Bjorken sum rule, the projected results allow us to determine that the QCD coupling at the Z-pole alpha_s can be measured with a relative precision of 1.3%. This underscores the significance of the EIC for achieving precision determinations of alpha_s.

   ↳ nucl-thnucl-exPRD(2024)·10 citations
6. 06*

   Photon induced proton and anti-proton pair production with ultraperipheral heavy ion collisions at RHIC

   Cheng Zhang🇨🇳 · Li-Mao Zhang🇨🇳 · Ding Yu Shao🇨🇳

   We investigate proton-antiproton ($p\bar{p}$) pair production via photon-photon fusion in the ultra-peripheral collisions at RHIC, employing a joint impact parameter and transverse momentum dependent formalism. We consider proton exchange, $s$-channel resonance and hand-bag mechanisms, predicting differential distributions of $p\bar{p}$ production. Our theoretical predictions can be tested against future measurements at RHIC, to enhance our understanding of photon-photon interactions in strong electromagnetic fields.

   ↳ hep-phhep-exnucl-exnucl-thSCPMA(2025)·9 citations
7. 07*

   Long Range Azimuthal Correlation, Entanglement and Bell Inequality Violation by Spinning Gluons at the LHC

   Yuxun Guo🇺🇸 · Xiaohui Liu🇨🇳 · Feng Yuan🇺🇸 · Hua Xing Zhu🇨🇳

   We apply the recently developed concept of the nucleon energy-energy correlator (NEEC) for the gluon sector to investigate the long-range azimuthal angular correlations in proton-proton collisions at the LHC. The spinning gluon in these collisions will introduce a significant nonzero $\cos (2\varphi )$ asymmetries in both Higgs Boson and top quark pair productions. The genesis of the $\cos (2\varphi )$ correlation lies in the intricate quantum entanglement. Owing to the substantial $\cos (2\varphi )$ effect, the NEEC observable in Higgs Boson and $t\bar{t}$ production emerges as a pivotal avenue for delving into quantum entanglement and scrutinizing the Bell inequality at high-energy colliders.

   ↳ hep-phhep-exhep-thnucl-ex+1Research(2025)·26 citations
8. 08*

   Feasibility of the observation of ${\eta }^{\prime }$ mesic nuclei in the semi-exclusive ${}^{12}$C($p,dp$) reaction

   Natsumi Ikeno🇯🇵 · Yuko Higashi🇯🇵 · Hiroyuki Fujioka🇯🇵 · Kenta Itahashi🇯🇵 · Ryohei Sekiya🇯🇵 · Yoshiki K. Tanaka🇯🇵 · Junko Yamagata-Sekihara🇯🇵 · Volker Metag🇩🇪 · Mariana Nanova🇩🇪 · Satoru Hirenzaki🇯🇵

   We study theoretically the feasibility of the semi-exclusive ${}^{12}$C($p,dp$)$X$ reaction for the observation of ${\eta }^{\prime }$ mesic nuclei using the microscopic transport model JAM. The semi-exclusive measurements of the ($p,d$) reaction with protons from ${\eta }^{\prime }$ absorption are found to be significant for the observation of the ${\eta }^{\prime }$ bound states. Especially, the measurements of the energetic protons from ${\eta }^{\prime }$ non-mesic two-body absorption (${\eta }^{\prime }NN\to NN$) are considered to be critically important. The Green's function method is used to calculate the expected spectrum of forward going deuterons corresponding to the excitation energy spectrum of the ${\eta }^{\prime }\otimes {}^{11}$C system in the semi-exclusive measurement. The semi-exclusive measurements are shown to be important in general for the ${\eta }^{\prime }$ mesic nucleus observation.

   ↳ nucl-thnucl-exPTEP(2026)·7 citations
9. 09*

   Modeling inclusive electron-nucleus scattering with Bayesian artificial neural networks

   Joanna E. Sobczyk🇩🇪 · Noemi Rocco🇺🇸 · Alessandro Lovato🇺🇸

   We introduce a Bayesian protocol based on artificial neural networks that is suitable for modeling inclusive electron-nucleus scattering on a variety of nuclear targets with quantified uncertainties. Unlike previous applications in the field, which directly parameterize the cross sections, our approach employs artificial neural networks to represent the longitudinal and transverse response functions. In contrast to cross sections, which depend on the incoming energy, scattering angle, and energy transfer, the response functions are determined solely by the energy and momentum transfer to the system, allowing the angular component to be treated analytically. We assess the accuracy and predictive power of our framework against the extensive data in the quasielastic inclusive electron-scattering database. Additionally, we present novel extractions of the longitudinal and transverse response functions and compare them with previous experimental analysis and nuclear ab-initio calculations.

   ↳ nucl-thhep-exnucl-exPLB(2024)·9 citations
10. 10*

    Uncertainty quantification for $\mu \to e$ conversion in nuclei: charge distributions

    Frederic Noël🇨🇭 · Martin Hoferichter🇨🇭

    Predicting the rate for $\mu \to e$ conversion in nuclei for a given set of effective operators mediating the violation of lepton flavor symmetry crucially depends on hadronic and nuclear matrix elements. In particular, the uncertainties inherent in this non-perturbative input limit the discriminating power that can be achieved among operators by studying different target isotopes. In order to quantify the associated uncertainties, as a first step, we go back to nuclear charge densities and propagate the uncertainties from electron scattering data for a range of isotopes relevant for $\mu \to e$ conversion in nuclei, including ${}^{40,48}$Ca, ${}^{48,50}$Ti, and ${}^{27}$Al. We provide as central results Fourier-Bessel expansions of the corresponding charge distributions with complete covariance matrices, accounting for Coulomb-distortion effects in a self-consistent manner throughout the calculation. As an application, we evaluate the overlap integrals for $\mu \to e$ conversion mediated by dipole operators. In combination with modern ab-initio methods, our results will allow for the evaluation of general $\mu \to e$ conversion rates with quantified uncertainties.

    ↳ nucl-thhep-exhep-phnucl-exJHEP(2024)·13 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.