Mon·Jan 29, 2024Monday·January 29, 2024

1. 01*

   Ground-state mass of ${}^{22}$Al and test of state-of-the-art \textit{ab initio} calculations

   M.Z. Sun · Y. Yu🇨🇦 · X.P. Wang · M. Wang🇨🇳 · J.G. Li🇨🇳 · Y.H. Zhang🇨🇳 · K. Blaum🇩🇪 · Z.Y. Chen🇨🇳 · R.J. Chen · H.Y. Deng🇨🇳 · C.Y. Fu · W.W. Ge🇨🇳 and 24 other authors

   The ground-state mass excess of the $T_z=-2$ drip-line nucleus ${}^{22}$Al is measured for the first time to be $18103(10)$ keV using the newly-developed B$\rho$-defined isochronous mass spectrometry method at the cooler storage ring in Lanzhou. The new mass excess value allowed us to determine the excitation energies of the two low-lying $1^{+}$ states in ${}^{22}$Al with significantly reduced uncertainties of 51 keV. Comparing to the analogue states in its mirror nucleus ${}^{22}$F, the mirror energy differences of the two $1^{+}$ states in the ${}^{22}$Al-${}^{22}$F mirror pair are determined to be $-625(51)$ keV and $-330(51)$ keV, respectively. The excitation energies and the mirror energy differences are used to test the state-of-the-art \textit{ab initio} valence-space in-medium similarity renormalization group calculations with four sets of interactions derived from the chiral effective field theory. The mechanism leading to the large mirror energy differences is investigated and attributed to the occupation of the $\pi s_{1/2}$ orbital.

   nucl-exCPC(2024)·17 citations
2. 02*

   On the detection of alpha emission from a low-voltage DC deuterium discharge with palladium electrodes

   Erik P. Ziehm · George H. Miley

   The possibility of nuclear reactions within a low voltage DC deuterium discharge with palladium electrodes is addressed. The solid-state nuclear track detector known as CR-39 was chosen to investigate the emission of energetic charged particles from the electrodes. A partially automated imaging platform and feature classification process was developed to scan the CR-39 surface and detect tracks. Typical discharge parameters were 10 Torr deuterium, 5-7 mm electrode gap distance, 20-40 mA/cm${}^2$ current density, and -500 $\pm$ 100 V cathode bias. After discharge treatments to varied ion-cathode fluences, tracks formed in CR-39 which consistently corresponded to 138 $\pm$ 21 keV alpha particles emitted from the palladium electrodes. The track densities for deuterium discharges were often $\sim$100 times above controls with hydrogen and helium. Currently, there are no known mechanisms to accelerate ions to these energies within the apparatus. The production of energetic alpha particles with no source of helium or a means to accelerate the ions to such high energies indicate a nuclear origin. From particle trajectory estimates based on track geometries, it was concluded the reactions originated at the Pd electrodes and not from external sources such as atmospheric radon or cosmic rays.

   nucl-exphysics.ins-det0 citations
3. 03*

   Role of Coulomb interaction in elastic pion-proton scattering from holography

   Yu-Peng Zhang🇨🇳 · Xun Chen🇨🇳 · Xiao-Hua Li🇨🇳 · Akira Watanabe🇨🇳

   Differential cross sections of the elastic pion-proton scattering are investigated at very small momentum transfer in a holographic QCD model, considering both the strong and Coulomb interaction in the Regge regime. The strong interaction is described by the Pomeron and Reggeon exchange, and the Coulomb interaction is characterized by the one photon exchange. The two interactions are linked through an interference term and we only need to determine a single adjustable parameter involved in this term. As to the parameters for the strong interaction, we can utilize the values determined in the previous studies. The differential cross sections can be predicted without any additional parameters, and it is shown that our predictions are consistent with the experimental data. We explicitly show the momentum transfer dependence for the interference effect. The energy dependence of the contribution ratios for each component is also discussed.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2024)·4 citations
4. 04*

   Direct WIMP detection rates for transitions in isomeric nuclei

   M.V Smirnov🇩🇪 · G. Yang🇺🇸 · Yu.N. Novikov🇷🇺 · J.D. Vergados🇬🇷 · D. Bonatsos🇬🇷

   The direct detection of dark matter constituents, in particular the weakly interacting massive particles (WIMPs), is central to particle physics and cosmology. In this paper we study WIMP induced transitions from isomeric nuclear states for two possible isomeric candidates: ${}^{180}\mathrm{Ta}$ and ${}^{166}\mathrm{Ho}$. The experimental setup, which can measure the possible decay of ${}^{180}\mathrm{Ta}$ induced by WIMPs, was proposed. The corresponding estimates of the half-life of ${}^{180}\mathrm{Ta}$ are given in the sense that the WIMP-nucleon interaction can be interpreted as ordinary radioactive decay.

   ↳ hep-phnucl-exnucl-thNPB(2024)·4 citations
5. 05*

   Long-lived doubly charged scalars in the left-right symmetric model: catalyzed nuclear fusion and collider implications

   Evgeny Akhmedov🇩🇪 · P. S. Bhupal Dev🇺🇸 · Sudip Jana🇩🇪 · Rabindra N. Mohapatra🇺🇸

   We show that the doubly charged scalar from the $SU(2{)}_R$-triplet Higgs field in the Left-Right Symmetric Model has its mass governed by a hidden symmetry so that its value can be much lower than the $SU(2{)}_R$ breaking scale. This makes it a long-lived particle while being consistent with all existing theoretical and experimental constraints. Such long-lived doubly charged scalars have the potential to trigger catalyzed fusion processes in light nuclei, which may have important applications for energy production. We show that it could also bear consequences on the excess of large ionization energy loss ($dE/dx$) recently observed in collider experiments.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2024)·8 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.