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Nuclear Theory·nucl-th

Monday·June 10, 2024

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    Barrier distribution extraction via Gaussian process regression

    Kyle Godbey

    This work presents a novel method for extracting potential barrier distributions from experimental fusion cross sections. We utilize a simple Gaussian process regression (GPR) framework to model the observed cross sections as a function of energy for three nuclear systems. The GPR approach offers a flexible way to represent the experimental data, accommodating potentially complex behavior without introducing strong prior assumptions. This method is applied directly to experimental data and is compared to the traditional direct extraction technique. We discuss the advantages of GPR-based barrier distribution extraction, including the capability to quantify uncertainties and robustness to noise in the experimental data.

    nucl-th1 citation
  2. 02

    Nonspherical Pauli-forbidden states in deformed halo nuclei: Impact on the resonant states in the particle rotor model

    Shin Watanabe · Antonio M. Moro

    Background: An important aspect of reducing nuclear many-body problems to few-body models is the presence of Pauli forbidden (PF) states, which are excluded in fully antisymmetrized calculations. Insufficient treatments of PF states in deformed halo nuclei underscore the need for model refinement. Purpose: We propose a new method utilizing Nilsson states as PF states in the orthogonality condition model, and investigate the impact of PF states on the properties of resonant states. Method: We investigate the scattering states of within the Particle Rotor Model (PRM) framework based on a deformed core and two-body model. We compare several methods for eliminating PF states and test them with the experimental data. Results: Our model successfully reproduces the experimental excitation function for elastic scattering cross section by properly eliminating PF states. The same calculation predicts the presence of a low-energy bump in the inelastic scattering excitation function, although its position is overestimated by about 1 MeV compared to experimental data. Conclusion: This study extends the applicability of the PRM, offering a comprehensive approach for exploring structures and reactions of loosely bound nuclei like B. Future integration with the continuum discretized coupled channels (CDCC) method promises to further advance the research.

    nucl-thPRC(2024)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE