Study of transfer reactions induced by a 16C beam

Abstract : Recent experiments have evidenced the existence of new shell gaps at N=14 and 16 in the neutron-rich oxygen isotopes, associated with the vanishing of the N=20 shell gap. The aim of this work is to investigate the possible appearance of these new magic numbers in the neutron-rich carbon isotopes by locating the 0d5/2, 1s1/2 and 0d3/2 neutron orbitals in 17C with the 16C(d,p)17C transfer reaction. The experiment was carried out at the GANIL facility. A 16C beam at 17.2 AMeV produced by fragmentation was used to bombard a CD2 target. The light ejectiles were detected using the TIARA silicon strip array while a Si-Si-CsI telescope was placed at 0 degree to identify beam-like residues. In addition, four HPGe EXOGAM clover detectors were used to measure the gamma-rays emitted by 17C bound excited states. The measured angular distributions confirm the spin and parity assignments of 3/2+, 1/2+ and 5/2+ for the ground state and the first and second excited states located at 217 keV and 335 keV, respectively. The spectroscopic factors deduced for these excited states indicate a large single particle strength, in agreement with shell model calculations. On the other hand, the spectroscopic factor of the ground state reveals an important 0d3/2 component, largely underestimated by the shell model. With a strong ℓ=0 valence neutron configuration and a low separation energy, the first excited state of 17C appears as a very good one-neutron halo candidate.
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  • HAL Id : tel-01522695, version 1

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Xesus Pereira Lopez. Study of transfer reactions induced by a 16C beam. Nuclear Experiment [nucl-ex]. Université de Caen Normandie, 2016. English. ⟨tel-01522695⟩

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