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Nuclear Theory·nucl-th

Monday·February 11, 2019

12 papers—3 primary·9 cross-listed

All12Primary3Cross-lists9
  1. 01

    Complete Glauber calculations for proton-nucleus inelastic cross sections

    S. Hatakeyama · W. Horiuchi

    We perform a parameter-free calculation for the high-energy proton-nucleus scattering based on the Glauber theory. A complete evaluation of the so-called Glauber amplitude is made by using the factorization of the single-particle wave functions. The multiple-scattering or multistep processes are fully taken into account within the Glauber theory. We demonstrate that proton- C, Ne, and Si elastic and inelastic scattering ( and ) processes are very well described in a wide range of the incident energies from 50 MeV to 1 GeV. We evaluate the validity of a simple one-step approximation andfind that the approximation works fairly well for the inelastic processes but not for where the multistep processes become more important. As an application, we quantify the difference between the total reaction and interaction cross sections of proton-C, Ne, and Si collisions.

    nucl-thNPA(2019)·17 citations
  2. 02

    Direct probing of the cluster structure in Be via -knockout reaction

    Mengjiao Lyu · Kazuki Yoshida · Yoshiko Kanada-En'yo · Kazuyuki Ogata

    Background: Recent theoretical and experimental researches using proton-induced -knockout reactions provide direct manifestation of -cluster formation in nuclei. In recent and future experiments, -knockout data are available for neutron-rich beryllium isotopes. In Be , rich phenomena are induced by the formation of -clusters surrounded by neutrons, for instance, breaking of the neutron magic number . Purpose: Our objective is to provide direct probing of the -cluster formation in the Be target through associating the structure information obtained by a microscopic theory with the experimental observables of -knockout reactions. Method: We formulate a new wave function of the Tohsaki-Horiuchi-Schuck-Röpke (THSR) type for the structure calculation of Be nucleus and integrate it with the distorted wave impulse approximation framework for the -knockout reaction calculation of BeHe. Results: We reproduce the low-lying spectrum of the Be nucleus using the THSR wave function and discuss the cluster structure of the ground state. Based on the microscopic wave function, the optical potentials and -cluster wave function are determined and utilized in the calculation of Be()He reaction at 250 MeV. The possibility of probing the clustering state of Be through this reaction is demonstrated by analysis of the triple differential cross sections that are sensitively dependent on the -cluster amplitude at the nuclear surface. Conclusions: This study provides a feasible approach to validate directly the theoretical predictions of clustering features in the Be nucleus through the -knockout reaction.

    nucl-thPRC(2019)·16 citations
  3. 03

    Les Houches Lectures on Effective Field Theories for Nuclear and (some) Atomic Physics

    U. van Kolck🇫🇷

    These lectures are a pedagogical -- not comprehensive -- introduction to the applications of effective field theory in the context of nuclear and atomic physics. A common feature of these applications is the interplay between nonperturbative physics (needed at leading order to produce nonrelativistic bound states and resonances) and controlled perturbative corrections (crucial for predictive power). The essential ideas are illustrated with the simplest nuclear EFT, Pionless EFT, which contains only contact interactions and, with minor changes, can be adapted to certain atomic systems. This EFT exploits the two-body unitarity limit, where renormalization leads to discrete scale invariance in systems of three and more bodies. Remarkably complex structures then arise from very simple leading-order interactions. Some of the challenges and rewards of including long-range forces -- pion exchange in Chiral EFT for nuclear systems or Van der Waals forces between atoms -- are briefly described.

    nucl-thcond-mat.quant-gashep-phLes Houches Lect.Notes(2020)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE