Wed·Sep 7, 2022Wednesday·September 7, 2022

1. 01*

   The Core of ${}^{25}$F studied by the ${}^{25}$F(-1p)${}^{24}$O reaction

   H. L. Crawford🇺🇸 · M. D. Jones · A. O. Macchiavelli🇺🇸 · P. Fallon · D. Bazin🇺🇸 · P. C. Bender🇺🇸 · B. A. Brown🇺🇸 · C. M. Campbell · R. M. Clark🇺🇸 · M. Cromaz🇺🇸 · B. Elman · A. Gade🇺🇸 and 10 other authors

   The ${}^{25}$F($5/2^{+})(-1p{)}^{24}$O reaction was studied at the NSCL using the S800 spectrometer. The experimental spectroscopic factor for the ground-state to ground-state transition indicates a substantial depletion of the proton $d_{5/2}$ strength compared to shell-model expectations. Our result supports the findings reported by Tang \textit{et al.}, from their study of the $(p,2p)$ reaction at RIBF. The overlap between the ${}^{25}$F and ${}^{24}$O ground-states is considerably less than anticipated if ${}^{24}$O acted as a robust and rigid doubly-magic core in ${}^{25}$F. We interpret the results within the framework of the Particle-Vibration Coupling (PVC) of a $d_{5/2}$ proton coupled to a quadrupole phonon of an effective core. This approach provides a good description of the experimental data by requiring an effective ${}^{24}$O* core with a phonon energy of $\hslash {\omega }_2$= 3.2 MeV, and a $B(E2)2.7$ W.u., softer and more collective than a bare ${}^{24}$O. Both the Nilsson deformed mean field and the PVC models appear to capture the properties of the effective core of ${}^{25}$F, suggesting that the additional proton tends to polarize the free, doubly magic ${}^{24}$O in such a way that it becomes either slightly deformed or a quadrupole vibrator.

   nucl-exnucl-th0 citations
2. 02*

   Simultaneous description of $\beta$ decay and low-lying structure of neutron-rich even- and odd-mass Rh and Pd nuclei

   K. Nomura🇭🇷 · L. Lotina🇭🇷 · R. Rodríguez-Guzmán🇰🇼 · L. M. Robledo🇪🇸

   The low-energy structure and $\beta$ decay properties of neutron-rich even- and odd-mass Pd and Rh nuclei are studied using a mapping framework based on the nuclear density functional theory and the particle-boson coupling scheme. Constrained Hartree-Fock-Bogoliubov calculations using the Gogny-D1M energy density functional are performed to obtain microscopic inputs to determine the interacting-boson Hamiltonian employed to describe the even-even core Pd nuclei. The mean-field calculations also provide single-particle energies for the odd systems, which are used to determine essential ingredients of the particle-boson interactions for the odd-nucleon systems, and of the Gamow-Teller and Fermi transition operators. The potential energy surfaces obtained for even-even Pd isotopes as well as the spectroscopic properties for the even- and odd-mass systems suggest a transition from prolate deformed to $\gamma$-unstable and to nearly-spherical shapes. The predicted $\beta$ decay $\log ft$ values are shown to be sensitive to the details of the wave functions for the parent and daughter nuclei, and therefore serve as a stringent test of the employed theoretical approach.

   ↳ nucl-thnucl-exPRC(2022)·9 citations
3. 03*

   Pion absorption from the lowest atomic orbital in 2H, 3H and 3He

   J. Golak🇵🇱 · V. Urbanevych🇵🇱 · R. Skibinski🇵🇱 · H. Witala🇵🇱 · K. Topolnicki🇵🇱 · V. Baru🇩🇪 · A. A. Filin🇩🇪 · E. Epelbaum🇩🇪 · H. Kamada🇯🇵 · A. Nogga🇩🇪

   The pi- + 2H -> n + n, pi- + 3H -> n + n + n, pi- + 3He -> n + d and pi- + 3He -> p + n + n capture reactions from the lowest atomic orbitals are studied under full inclusion of final state interactions. Our results are obtained with the single-nucleon and two-nucleon transition operators derived at leading order in chiral effective field theory. The initial and final three-nucleon states are calculated with the chiral nucleon-nucleon SMS potential up to N4LO+ augmented by the consistently regularized chiral N2LO three-nucleon potential. We found that absorption rates depend strongly on the nuclear pion absorption operator used, and its two-body parts change the rates by a few orders of magnitude. The final state interactions between nucleons generated by the two-nucleon forces are also important, while the three-nucleon interaction plays a visible role only in the pi- + 3He -> n + d reaction. Our absorption rate for the pi- + 2H -> n + n process is in good agreement with the experimental data from the hadronic ground-state broadening in pionic deuterium. The capture rates on 3He are also generally consistent with the spectroscopic data within error bars, though our central values are found to be systematically below the data. We show that for the three-body breakup processes the dominant contributions to the absorption rates arise from the quasi-free scattering and final-state interaction kinematical configurations.

   ↳ nucl-thnucl-exPRC(2022)·2 citations
4. 04*

   ALETHEIA: Hunting for Low-mass Dark Matter with Liquid Helium TPCs

   Junhui Liao · Yuanning Gao · Zhen Jiang · Zhuo Liang · Zebang OuYang · Zhaohua Peng · Fengshou Zhang · Lei hang · Jiangfeng Zhou

   Dark Matter (DM) is one of the most critical questions to be understood and answered in fundamental physics today. Observations with varied astronomical and cosmological technologies strongly indicated that DM exists in the Universe, the Milky Way, and the Solar System. Nevertheless, understanding DM under the language of elementary physics is still in progress. DM direct detection tests the interactive cross-section between galactic DM particles and an underground detector's nucleons. Although Weakly Interactive Massive Particles (WIMPs) are the most discussed DM candidates, the null-WIMPs conclusion has been consistently addressed by the most convincing experiments in the field. Relatively, the low-mass WIMPs region ($\sim$ 10 MeV/c${}^2$ - 10 GeV/c${}^2$) has not been fully exploited compared to high-mass WIMPs ($\sim$ 10 GeV/c${}^2$ - 10 TeV/c${}^2$). The ALETHEIA (A Liquid hElium Time projection cHambEr In dArk matter) experiment aims to hunt for low-mass WIMPs with liquid helium-filled TPCs (Time Projection Chambers). In this paper, we go through the physics motivation of the project, the detector's design, the R\&D plan, and the progress we have made since the project has been launched in the summer of 2020.

   ↳ astro-ph.IMhep-exnucl-exEur.Phys.J.Plus(2023)·11 citations
5. 05*

   Cross-channel constraints on resonant antikaon-nucleon scattering

   Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳 · Michael Doering🇺🇸 · Maxim Mai🇺🇸

   Chiral perturbation theory and its unitarized versions have played an important role in our understanding of the low-energy strong interaction. Yet, so far, such studies typically deal exclusively with perturbative or nonperturbative channels. In this letter, we report on the first global study of meson-baryon scattering up to one-loop order. It is shown that covariant baryon chiral perturbation theory, including its unitarization for the negative strangeness sector, can describe meson-baryon scattering data remarkably well. This provides a highly non-trivial check on the validity of this important low-energy effective field theory of QCD. We show that the $\bar{K}N$ related quantities can be better described in comparison with those of lower-order studies, and with reduced uncertainties due to the stringent constraints from the $\pi N$ and $KN$ phase shifts. In particular, we find that the two-pole structure of $\Lambda (1405)$ persists up to one-loop order reinforcing the existence of two-pole structures in dynamically generated states.

   ↳ hep-phhep-exnucl-exnucl-thPRL(2023)·60 citations
6. 06*

   Synthesis of cold and trappable fully stripped HCI's via antiproton-induced nuclear fragmentation in traps

   G. Kornakov (1) · G. Cerchiari (2) · J. Zieliński (1) · L. Lappo (1) · G. Sadowski (3) · M. Doser (3) ((1) Warsaw University of Technology · (2) Institut für Experimentalphysik Universität Innsbruck · (3) CERN)

   The study of radioisotopes as well as of highly charged ions is a very active and dynamic field. In both cases, the most sensitive probes involve species trapped in Penning or Paul traps after a lengthy series of production and separation steps that limit the types and lifetimes of species that can be investigated. We propose a novel production scheme that forms fully (or almost fully) stripped radionuclei in form of highly charged ions (HCI's) directly in the trapping environment. The method extends the range of species, among them radioisotopes such as ${}^{21}$F, ${}^{100}$Sn or ${}^{229}$Th, that can be readily produced and investigated and is complementary to existing techniques.

   ↳ physics.atom-phnucl-exnucl-thPRC(2023)·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.