Abstract
The neutron rich carbon isotope 15C is the only known case of an almost “pure” 2s1/2 single-neutron halo ground state configuration. At collision energies around the Coulomb barrier the reaction dynamics is expected to be dominated by single neutron transfer and breakup. To investigate these effects, we have measured the scattering of 15C with a 208Pb target at 65 MeV at the HIE-ISOLDE facility in CERN (Geneva, Switzerland). The preliminary data demonstrates the presence of a strong long-range absorption pattern in the angular distribution of the elastic cross section. The results are discussed in the framework of Optical Model calculations.
Highlights
Nuclear systems such as 6He, 11Li or 11Be are known to have an extended neutron distribution, the socalled neutron halo [1]
The preliminary data demonstrates the presence of a strong long-range absorption pattern in the angular distribution of the elastic cross section
At Coulomb barrier energies (~ 5 MeV/u), the halo structure manifests itself with a strong absorption pattern in the angular distribution of the elastic cross sections, where the nuclear rainbow completely disappears [3]
Summary
Nuclear systems such as 6He, 11Li or 11Be are known to have an extended neutron distribution, the socalled neutron halo [1]. Halos are formed in weakly bound nuclei close to the neutron drip line, where the valence neutrons can tunnel out the barrier with larger probability. The presence of a halo can be probed at high collision energies by the observation of narrow momentum distribution in the breakup fragments and large interaction cross sections [2]. At Coulomb barrier energies (~ 5 MeV/u), the halo structure manifests itself with a strong absorption pattern in the angular distribution of the elastic cross sections, where the nuclear rainbow completely disappears [3]. We investigate the scattering of 15C with a 208Pb target at 65 MeV at the HIE-ISOLDE facility at CERN (Geneva, Switzerland) (experiment IS619) to elucidate its behaviour
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