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Nuclear Theory·nucl-th

Tuesday·February 25, 2025

21 papers—6 primary·15 cross-listed

All21Primary6Cross-lists15
  1. 01

    A systematic study of initial state quark energy loss in fixed target proton nucleus collision

    Sourav Kanti Giri🇮🇳 · Partha Pratim Bhaduri🇮🇳 · Biswarup Paul🇮🇳 · Santosh K. Das🇮🇳

    In this article, we investigate parton energy loss in cold nuclear matter by studying the ratio of Drell-Yan production cross sections in fixed-target proton-nucleus (p + A) collisions. We analyze Drell-Yan production cross-section data from the Fermilab E866 and E906 experiments using two different quark energy loss parametrization models and various parton distribution functions for 800 GeV and 120 GeV proton beams incident on light and heavy nuclear targets. The sensitivity of the energy loss parameter on the employed parton distribution function has been thoroughly investigated. Our results have been used to predict the target mass dependence of Drell-Yan production in upcoming proton-induced collisions at SPS and FAIR.

    nucl-thnucl-exEPJC(2025)·5 citations
  2. 02

    The effect of three-body nucleon-nucleon interaction on the ground state binding energy of the light nuclei

    F. Kamgar · G. H. Bordbar · S. M. Zebarjad · M. A. Rastkhadiv

    We calculate the ground state binding energies of the light nuclei such as 4He, 6Li, 12C and 14N by considering the effect of three-body nucleon-nucleon interaction. We use the effective twobody potential obtained from the lowest order constrained variational (LOCV) calculations of the nuclear matter for the Reid68, AV14, UV14, and AV18 nuclear potentials in different channels. To calculate the ground state binding energy, we implement the local density approximation by using the harmonic oscillator wave functions while the effect of three-body interaction is considered by employing the UIX potential. We compare the obtained two-body ground state binding energy with the energy related to the three-body effect. We also compare the obtained values with the experimental data and also work of others, and show that the results are relatively acceptable. We compute the root mean-square radius Rrms of the above nuclei for the Reid68, AV14, UV14, and AV18 potentials and compare the results with the experiment. We also obtain the contribution of different channels by matching to the experimental values of the quadrupole moments and magnetic dipole moments. Furthermore, we calculate the three-body cluster energy of the above nuclei and compare the results with that of nuclear matter. According to the obtained results, we see that the three-body cluster energy contribution is small. For example, for 4He nuclide, this value is 0.079 MeV with the Reid68 potential.

    nucl-thhep-phNPA(2025)·0 citations
  3. 03

    Effect of potential-energy-model inaccuracies on predictions of fission-fragment mass distributions based on the Brownian shape-motion method

    Peter Möller🇸🇪 · Christelle Schmitt🇫🇷

    Moller and Randrup presented a comprehensive calculation, based on the Brownian shape motion (BSM) method, of fission-fragment charge distributions [Phys. Rev. C 91 (2015) 044316 ] which obtained that ``a new region of asymmetry'' appeared for approximately and . Available experimental results at the time, except for the observation of symmetric fission of Ir by Itkis et al. [Yad. Fiz. 52 (1990) 944], agreed with these predictions apart for minor differences in the transition regions between predicted symmetric and asymmetric fission. It was argued [Phys. Rev. C 91 (2015) 044316 ] that the inaccurate results for Ir were related to inaccuracies in the calculated potential-energy surface and that such inaccuracies are related to the (in)accuracies of the calculated ground-state masses for the corresponding mass splits. We present here more detailed discussions and investigate if differences between the fission-fragment mass yields presented in [Phys. Rev. C 91 (2015) 044316 ] and experiment can occur in other regions of fissioning nuclei.

    nucl-thPRC(2025)·0 citations
  4. 04

    Pauli Blocking effects in Nilsson states of weakly bound exotic nuclei

    P. Punta · J. A. Lay · A. M. Moro · G. Colò

    The description of weakly bound nuclei using deformed few-body models has proven to be crucial in the study of reactions involving certain exotic nuclei. However, these core+valence models face the challenge of applying the Pauli exclusion principle, since the factorisation of the system does not allow complete antisymmetrization. Therefore, states occupied by core nucleons should be blocked for the valence nucleons. We aim to study C and C, which are good examples of weakly bound exotic nuclei with significant deformation where the valence shell is partially filled. The structure of C and C is described with deformed two-body models where a Nilsson Hamiltonian is constructed using Antisymmetrized Molecular Dynamic calculations of the cores. Different methods of blocking occupied Nilsson states are considered using the BardeenCooperSchrieffer formalism: without blocking, total blocking and partial blocking. The latter also takes into account pair correlations to some extent. These models are later used to study CC, CC and CC transfer reactions within the Adiabatic Distorted Wave Approximation. In the first case, the results are compared with experimental data. A good reproduction of the structure of C is found, significantly improving the agreement in the CC reaction including blocking effects. The C spectrum is better reproduced considering blocking, in particular, the partial blocking method that considers the pairing interaction provides the best description. Promising results are shown for the study of transfer reactions involving weakly bound exotic nuclei, by highlighting the effect of blocking occupied Nilsson states. We envision to extend the models to the study of breakup reactions and to newly discovered halo nuclei.

    nucl-thPRC(2025)·4 citations
  5. 05

    Cabibbo-Kobayashi-Maskawa unitarity deficit reduction via finite nuclear size

    M Gorchtein🇩🇪 · V Katyal🇮🇳 · B Ohayon🇮🇱 · B K Sahoo🇮🇳 · CY Seng🇺🇸

    We revisit the extraction of the CKM matrix element from the superallowed transition decay rate of AlMg, focusing on finite nuclear size effects. The decay rate dependence on the Al charge radius is found to be four times higher than previously believed, necessitating precise determination. However, for a short-lived isotope of an odd element such as Al, radius extraction relies on challenging many-body atomic calculations. We performed the needed calculations, finding an excellent agreement with previous ones, which used a different methodology. This sets a new standard for the reliability of isotope shift factor calculations in many-electron systems. The value obtained from our analysis is lower by than the corresponding value in the previous critical survey, resulting in an increase in by . Adopting from this decay alone reduces the CKM unitarity deficit by one standard deviation, irrespective of the choice of .

    nucl-thhep-phnucl-exphysics.atom-ph+1PRResearch(2025)·13 citations
  6. 06

    Three-body calculation of deuteron-nucleus scattering using microscopic global optical potential

    A. Deltuva · D. Jurčiukonis · D. Likandrovas · J. Torres Fernandez

    We test microscopic global optical potential in three-body calculations of deuteron-nucleus scattering. We solve Faddeev-type equations for three-body transition operators. We calculate differential cross section and analyzing power for the deuteron elastic scattering and breakup in collisions with C, O and Mg nuclei, and find a reasonable agreement with available experimental data. Comparison with respective predictions using phenomenological optical potentials reveals systematic deviations in particular kinematic regimes.

    nucl-thnucl-exFew Body Syst.(2024)·1 citation

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first authorsco-authorsvia INSPIRE