Low-lying single-particle structure of 17C and the N = 14 sub-shell closure

Description

The first investigation of the single-particle structure of the bound states of 17C, via the d(16C, p) transfer reaction, has been undertaken. The measured angular distributions confirm the spin-parity assignments of 1/2+ and 5/2+ for the excited states located at 217 and 335 keV, respectively. The spectroscopic factors deduced for these states exhibit a marked single-particle character, in agreement with shell model and particle-core model calculations, and combined with their near degeneracy in energy provide clear evidence for the absence of the N = 14 sub-shell closure. The very small spectroscopic factor found for the 3/2+ ground state is consistent with theoretical predictions and indicates that the ν1d3/2 strength is carried by unbound states. With a dominant = 0 valence neutron configuration and a very low separation energy, the 1/2+ excited state is a one-neutron halo candidate.

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Consejo de Instalaciones Científicas y Tecnológicas de UKRI. Reino Unido P003885

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Agencia Estatal de Investigación de España. Programa Ramón y Cajal RYC-2010-06484 y RYC-2012-11585

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Ministerio de Economia, Industria y Competitividad (MINECO) de España No. FPA2013-46236-P

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Ministerio de Ciencia, Innovación y Universidades español y los fondos FEDER FIS2017-88410-P y RTI2018-098117-B-C21

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El programa de investigación e innovación Horizon 2020 de la Unión Europea Subvención No. 654002

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