PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·September 13, 2024

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    Computing the QRPA Level Density with the Finite Amplitude Method

    Antonio Bjelčić · Nicolas Schunck

    We describe a new algorithm to calculate the vibrational nuclear level density of an atomic nucleus. Fictitious perturbation operators that probe the response of the system are generated by drawing their matrix elements from some probability distribution function. We use the Finite Amplitude Method to explicitly compute the response for each such sample. With the help of the Kernel Polynomial Method, we build an estimator of the vibrational level density and provide the upper bound of the relative error in the limit of infinitely many random samples. The new algorithm can give accurate estimates of the vibrational level density. Since it is based on drawing multiple samples of perturbation operators, its computational implementation is naturally parallel and scales like the number of available processing units.

    nucl-thComput.Phys.Commun.(2025)·1 citation
  2. 02

    Color transparency in hard collisions

    A.B. Larionov🇷🇺

    As one of the predictions of perturbative QCD, the effect of color transparency has been the focus of attention in the community studying modifications of hadrons in nuclear medium for several decades. The search for this effect in reactions involving heavy nuclei can be complicated by uncertainties in nuclear characteristics (nucleon density distributions and wave functions), which can affect the interpretation of experiments. In this work, we consider the reaction at GeV/c caused by hard elastic scattering, in which these uncertainties are actually reduced to the behavior of the deuteron wave function at large momenta. It is shown that for transverse momenta of the spectator neutron GeV/c the choice of the deuteron wave function cannot affect the identification of the color transparency effect. A simple method for studying color transparency in collisions is also suggested based on the identification of quasi-free interactions.

    nucl-thhep-exhep-phnucl-ex0 citations
  3. 03

    Quantifying the breakdown scale of pionless effective field theory

    Andreas Ekström🇸🇪 · Lucas Platter🇺🇸

    We use Bayesian statistics to infer the breakdown scale of pionless effective field theory in its standard power counting and with renormalization of observables carried out using the power-divergence subtraction scheme and cutoff regularization. We condition our inference on predictions of the total neutron-proton scattering cross section up next-to-next-to leading order. We quantify a median breakdown scale of approximately 1.4. The 68% degree of belief interval is . This result confirms the canonical expectation that the pion mass is a relevant scale in low-energy nuclear physics.

    nucl-thhep-phPLB(2025)·14 citations
  4. 04

    First complete description of low-lying spectroscopy in No

    D. D. Dao🇫🇷 · F. Nowacki🇫🇷

    In this work, we report the first complete shell-model description of low-lying structures of No. Employing the Kuo-Herling effective interaction, the calculations are performed within the Discrete Non-Orthogonal Shell Model recently implemented with the angular-momentum Variation After Projection applied on non-axial wavefunctions. Our calculations show a striking agreement with the experimentally known spectroscopy: the \textit{Yrast} band, the (), () and () isomers together with associated bands. We reproduce the recently measured Gallagher-Moszkowski splitting between the () and () band heads. We predict the appearance of a second state, in excellent agreement with recent new observation. In addition, we systematically examine the ground state spectra, dipole and spectroscopic quadrupole moments of even-even, odd-even, odd-odd nuclei from to , which are favourably reproduced. The present description of No shows the ability of the Shell Model framework to describe the low-lying properties for such an exotic nucleus at the frontier of modern experimental nuclear physics research.

    nucl-thPRC(2026)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE