Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Structure and Dynamics of Nuclei V

HK 29.4: Talk

Tuesday, March 29, 2022, 16:45–17:00, HK-H6

Perturbative inclusion of core excitation in a structure model of one-neutron halo nuclei — •Live-Palm Kubushishi and Pierre Capel — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany

Halo nuclei are exotic nuclear structures found near the dripline and thus short-lived. In standard reaction models, halo nuclei are described as simple two or three-body systems: an inert core with one or two weakly bound neutrons. However, some breakup data suggest that the structure of the core, and in particular its excitation to its excited states, can play a role in the dynamics of the reaction [1]. In this talk, we propose a simple structure model to account for that effect. Here we consider the example of the one-neutron halo nucleus ¹¹Be. To improve our description of the ¹⁰Be core without resorting to a purely microscopic model, we use a collective one: the rigid rotor. We assume the core to be weakly deformed, which we treat at the first order of perturbations to couple it to its 2⁺ first excited state, and we add this degree of freedom to the halo effective field theory description of ¹¹Be [2]. Our calculations were performed using the R-matrix method on a Lagrange mesh. In this context, we have been able to reproduce with a good agreement, the coupled-channels results [3] and improve the halo-EFT model [2] with respect to ab initio results [4].
[1] R. de Diego, et al., Phys. Rev. C 95, 044611 (2017).
[2] P. Capel, et al., Phys. Rev. C 98, 034610 (2018).
[3] F.M. Nunes, et al., Nucl. Phys. A 596, 171 (1996).
[4] A. Calci, et al., Phys. Rev. Lett. 117, 242501 (2016).