PaperPanorama
FAQ

Nuclear Theory·nucl-th

Monday·July 25, 2022

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 01

    The European Muon Collaboration effect from short-range correlated nucleons in a -rescaling model

    Rong Wang🇨🇳 · Na-Na Ma🇨🇳 · Tao-Feng Wang🇨🇳

    In this paper, we examine the hypothesis that the nuclear EMC effect comes merely from the N-N SRC pairs inside the nucleus and that the properties of N-N SRC pair are universal among the various nuclei, using the conventional -rescaling model for the EMC effect. With the previously determined effective mass of the short-range correlated nucleon and the number of N-N SRC pairs estimated, we calculate the EMC effect of various nuclei within the -rescaling approach. From our calculations, the nuclear EMC effect due to the mass deficits of the SRC nucleons is not enough to reproduce the observed EMC effect in experiments. We speculate that the internal structure of the mean-field single nucleon is also obviously modified, or there are more origins of the EMC effect beyond the N-N SRC configuration (such as the cluster), or the universality of N-N SRC pair is violated noticeably from light to heavy nuclei.

    nucl-thhep-phCPC(2023)·12 citations
  2. 02

    Ab initio calculation of the decay spectrum of He

    Garrett B. King🇺🇸 · Alessandro Baroni🇺🇸 · Vincenzo Cirigliano🇺🇸 · Stefano Gandolfi🇺🇸 · Leendert Hayen🇺🇸 · Emanuele Mereghetti🇺🇸 · Saori Pastore🇺🇸 · Maria Piarulli🇺🇸

    We calculate the spectrum in the decay of He using Quantum Monte Carlo methods with nuclear interactions derived from chiral Effective Field Theory and consistent weak vector and axial currents. We work at second order in the multipole expansion, retaining terms suppressed by , where denotes low-energy scales such as the reaction's -value or the electron energy, and the pion mass. We go beyond the impulse approximation by including the effects of two-body vector and axial currents. We estimate the theoretical error on the spectrum by using four potential models in the Norfolk family of local two- and three-nucleon interactions, which have different cut-off, fit two-nucleon data up to different energies and use different observables to determine the couplings in the three-body force. We find the theoretical uncertainty on the spectrum, normalized by the total rate, to be well below the permille level, and to receive contributions of comparable size from first and second order corrections in the multipole expansion. We consider corrections to the decay spectrum induced by beyond-the-Standard Model charged-current interactions in the Standard Model Effective Field Theory, with and without sterile neutrinos, and discuss the sensitivity of the next generation of experiments to these interactions.

    nucl-thhep-phnucl-exPRC(2023)·36 citations

Affiliations

first authorsco-authorsvia INSPIRE