Nuclear Experiment·nucl-ex
5 papers—3 primary·2 cross-listed·reconstructed*
Victor V. Flambaum🇦🇺 · Junlan Jin🇨🇳 · Dmitry Budker🇩🇪
We present a possibility of direct resonance production of pionic atoms (Coulomb bound states of a negative pion and a nucleus) with a rate of up to per second using the gamma-ray beams from the Gamma Factory.
H. Heylen (1,2,3)🇨🇭 · C.S. Devlin (4)🇬🇧 · W. Gins (2,5)🇧🇪 · M.L. Bissell (6)🇬🇧 · K. Blaum (3)🇩🇪 · B. Cheal (4)🇬🇧 · L. Filippin (7)🇧🇪 · R.F. Garcia Ruiz (1,6)🇨🇭 · M. Godefroid (7)🇧🇪 · C. Gorges (8)🇩🇪 · J.D. Holt (9,10)🇨🇦 · A. Kanellakopoulos (2)🇧🇪 and 15 other authors
Hyperfine spectra of Al () have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the atomic transition. For the first time, mean-square charge radii of radioactive aluminum isotopes have been determined alongside the previously unknown magnetic dipole moment of Al and electric quadrupole moments of Al. A potentially reduced charge radius at may suggest an effect of the shell closure, which is visible in the Al chain, contrary to other isotopic chains in the shell. The experimental results are compared to theoretical calculations in the framework of the valence-space in-medium similarity renormalization group using multiple sets of two and three-nucleon forces from chiral effective field theory. While the trend of experimental magnetic dipole and electric quadrupole moments is well reproduced, the absolute values are underestimated by theory, consistent with earlier studies. Moreover, both the scale and trend of the charge radii appear to be very sensitive to the chosen interaction.
J. Adamczewski-Musch (4) · A. Belyaev (7) · A. Blanco (1) · C. Blume (8) · C. Charlotte (8) · D.S. Borisenko (12) · C. Charlotte (8) · L. Chlad (16) · P. Chudoba (16) · I. Ciepał (2) · A. Derichs (24, 11) · D. Dittert (5) and 119 other authors
A feasibility study has been performed in order to investigate the performance of the HADES detector to measure the electromagnetic decays of the hyperon resonances , and as well as the production of double strange baryon systems and in p+p reactions at a beam kinetic energy of 4.5 GeV. The existing HADES detector will be upgraded by a new Forward Detector, which extends the detector acceptance into a range of polar angles that plays a crucial role for these investigations. The analysis of each channel is preceded by a consideration of the production cross-sections. Afterwards the expected signal count rates using a target consisting of either liquid hydrogen or polyethylene are summarized.
V. Sharma🇹🇼 · L. Singh🇹🇼 · H.T. Wong🇹🇼 · M. Agartioglu🇹🇼 · J.-W. Chen🇹🇼 · M. Deniz🇹🇷 · S. Kerman🇹🇷 · H.B Li🇹🇼 · C.-P. Liu🇹🇼 · K. Saraswat🇹🇼 · M.K. Singh🇹🇼 · V. Singh (TEXONO Collaboration)🇮🇳
Neutrino-nucleus elastic scattering () provides a unique laboratory to study the quantum-mechanical (QM) coherency effects in electroweak interactions. The deviations of the cross-sections from those of completely coherent systems can be quantitatively characterized through a coherency parameter . The relations between and the underlying nuclear physics in terms of nuclear form factors are derived. The dependence of cross-section on for the various neutrino sources is presented. The -values are evaluated from the measured data of the COHERENT CsI and Ar experiments. Complete coherency and decoherency conditions are excluded by the CsI data with at and with at , respectively, verifying that both QM superpositions and nuclear many-body effects contribute to interactions.
We present an Standard Model calculation of the inner radiative corrections to Gamow-Teller decays. We find that \textit{a priori} contributions arise from the photonic vertex correction and box diagram. Upon evaluation most elastic contributions vanish due to crossing symmetry or cancellation between isoscalar and isovector photonic contributions, leaving only the polarized parity-odd contribution, i.e., the Gamow-Teller equivalent of the well-known axial box contribution for Fermi decays. We show that weak magnetism contributes significantly to the Born amplitude, and consider additional hadronic contributions at low energy using a holomorphic continuation of the polarized Bjorken sum rule constrained by experimental data. We perform the same procedure for the Fermi inner radiative correction through a combination of the running of Bjorken and Gross-Llewellyn Smith sum rules. We discuss heavy flavor, higher-twist, and target mass corrections and find a significant increase at low momentum from the latter. We find and for axial and vector inner radiative corrections, respectively, resulting in , which allows us to extract for the first time to our knowledge. We discuss consequences for comparing experimental data to lattice calculations in beyond Standard Model fits. Further, we show how some traditional decay calculations contain part of this effect but fail to account for cancellations in the full result. Finally, we correct for a double-counting instance in the isospin mirror decay extraction of , the up-down matrix element of the Cabibbo-Kobayashi-Maskawa matrix, resolving a long-standing tension and leading to increased precision.
* 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.