Halo Effects in the Low-energy Scattering of $^{15}$C with Heavy Targets

J.D. Ovejas , A. Knyazev , I. Martel , O. Tengblad , M.J.G. Borge , J. Cederkäll , N. Keeley , K. Rusek , C. García-Ramos , L.A. Acosta , A.A. Arokiaraj , M. Babo , T. Cap , N. Ceylan , G. de Angelis , A. Di Pietro , J.P. Fernández , P. Figuera , L. Fraile , H. Fynbo , D. Galaviz , J.H. Jensen , B. Jonson , R. Kotak , T. Kurtukian (1) , M. Madurga , G. Marquínez-Durán , M. Munch , A.K. Orduz (2) , R. Honório , A. Pakou , T. Pérez , L. Peralta , A. Perea , R. Raabe , M. Renaud , K. Riisager , A.M. Sánchez-Benítez , J. Sánchez-Segovia , O. Sgouros , V. Soukeras , P. Teubig , S. Viñals , M. Wolińska-Cichocka , R. Wolski , J. Yang

1 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 GANIL - Grand Accélérateur National d'Ions Lourds

The neutron-rich carbon isotope 15C was postulated to be a halo nucleus (Sn = 1215 keV, S2n = 9395 keV) according to different high-energy experiments. If so, it would be the only halo nucleus exhibiting a “pure” s-wave structure of the ground state. At low collision energies, the effect of this halo structure should manifest as a strong absorption pattern in the angular distribution of the elastic cross section, with a total suppression of the nuclear rainbow due to the large neutron transfer and breakup probabilities, enhanced by the halo configuration. The IS619 experiment, carried out at the HIE-ISOLDE facility at CERN (Switzerland), is the first dynamical study of this nucleus at energies around the Coulomb barrier. It aims to probe the halo structure via the measurement of the elastic cross section on a high-Z 208Pb target. Preliminary results of the elastic cross section are discussed and compared to Optical Model calculations.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique des accélérateurs [physics.acc-ph]

J.D. Ovejas, A. Knyazev, I. Martel, O. Tengblad, M.J.G. Borge, et al.. Halo Effects in the Low-energy Scattering of $^{15}$C with Heavy Targets. 36th Mazurian Lakes Conference on Physics, Sep 2019, Piaski, Poland. pp.731, ⟨10.5506/APhysPolB.51.731⟩. ⟨hal-02886887⟩