Speaker
Description
Nuclei that present a three-body character have attracted special interest over the past few decades. Of particular relevance is the case of Borromean two-neutron halo nuclei, e.g., 6He, 11Li or 14Be, which exhibit exotic features in nuclear collisions [1]. The correlations between the valence neutrons, often described in terms of pairing, are known to play a fundamental role in shaping the properties of these systems [2,3]. The evolution of these correlations beyond the driplines gives rise to two-neutron emitters, e.g., 13Li, 16Be or 26O [4]. Since they have a marked core+N+N character, three-body models are a natural choice to analyze their structure and processes involving them [5, 6]. The description of the continuum in three-body nuclei, however, is not an easy task. In Ref. [7] we proposed a method to characterize few-body resonances from the time evolution of the lowest eigenstates of a resonant operator in a discrete basis, with the aim of studying the population of these systems in knockout reactions. The relative-energy distributions in their decay can be computed by solving an inhomogeneus equation with a source term involving the resonance eigenstate [8]. The method has been applied to 16Be [9] and 13Li [10], showing signatures of direct two-neutron decay, and in good agreement with recent experimental observations. These unpublished results will be presented, together with prospects for future developments and applications.
[1] I. Tanihata, et al., Prog. Part. Nucl. Phys. 68, 215 (2013).
[2] Esbensen H., Bertsch G. F. and Hencken K., Phys. Rev. C, 56 (1997) 3054.
[3] Hagino K. and Sagawa H., Phys. Rev. C, 72 (2005) 044321.
[4] Z. Kohley, et al., Phys. Rev. Lett. 110, 152501 (2013).
[5] M. V. Zhukov, et al., Phys. Rep. 231, 151 (1993).
[6] A. E. Lovell, F. M. Nunes and I. J. Thompson, Phys. Rev. C 95, 034605 (2017).
[7] J. Casal and J. Gómez-Camacho, Phys. Rev. C 99, 014604 (2019).
[8] J. Casal and J. Gómez-Camacho, in preparation (2024).
[9] B. Monteagudo et al., submitted for publication (2024).
[10] P. André et al., submitted for publication (2024).
