Spectroscopy of C13 above the α threshold with α+Be9

Abstract

In this work we reinvestigate the spectroscopy of 13 C at excitation energies larger than the α emission threshold (E x > 10.648 MeV) by means of a comprehensive R-matrix fit of experimental data concerning α + 9 Be collisions at low energies. Owing to the analysis of many reaction channels in a broad energy range, we improved the current knowledge on the level scheme of 13 C, by contributing to remove uncertain J π assignments for several states. Some tentative speculations on the existence of molecular bands associated to cluster structures in this nucleus are also discussed.

Editorial: Nuclear structure and dynamics with stable and unstable beams

“…For example, reactions between light nuclei produce a mine of information on the structure of ground and excited states of such few-body systems. In recent times, many of such investigations have been focused on the study of α-clustering rearrangement both in self-and non-self conjugate nuclei (see, e.g., [1][2][3][4]), a peculiar phenomenon that is linked to the presence of long-range correlations in nuclear forces. Nuclear reactions involving αclustered systems are also a powerful tool to explore the competition between low-energy reaction mechanisms, such as elastic scattering and α-transfer Lichtenthäler Filho et al [5]; Lépine-Szily et al [6].…”

“…Furthermore, nuclear reactions induced by weakly bound projectiles as deuterons and/or 3 He are still of paramount importance for the understanding of shell-model predictions in proton-rich or neutron-rich nuclei, even for particularly exotic nuclear systems [13,14]. In this respect, the availability of new, unstable, neutron rich beams triggered the development of new cryogenic d or 3 He target to be used in transfer experiments in inverse kinematics [15]. Another important tool to study the structure of excited states of nuclei far from the stability line is linked to the analysis of reactions induced by weakly bound 6,7 Li 10,11 B projectiles [16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”