Emergence of the N=16 shell gap in 21O

B. Fernandez-Dominguez , J. S. Thomas , W. N. Catford , F. Delaunay , S. M. Brown , N. A. Orr , M. Rejmund , N. L. Achouri

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H. Al Falou N. A. Ashwood D. Beaumel Y. Blumenfeld B. A. Brown R. Chapman M. Chartier N. Curtis C. Force G. de France S. Franchoo J. Guillot P. Haigh F. Hammache M. Labiche V. Lapoux R. C. Lemmon F. Marechal A. Moro B. Martin X. Mougeot B. Mouginot L. Nalpas A. Navin N. Patterson B. Pietras E. C. Pollacco A. Leprince A. Ramus J. A. Scarpaci N. de S\'er\'eville I. Stefan O. Sorlin G. Wilson

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classification ⚛️ nucl-ex

keywords beenstatesemergencefirstobservedshellassignmentbeam

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The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were observed at excitation energies of 4.76 +- 0.10 and 6.16 +- 0.11. The spectroscopic factor deduced for the lower of these interpreted as a 3/2+ level, reveals a rather pure 0d3/2 single-particle configuration. The large energy difference between the 3/2+ and 1/2+ states is indicative of the emergence of the N=16 magic number. For the higher lying resonance, which has a character consistent with a spin-parity assignment of 3/2+ or 7/2-, a 71% branching ratio to the first 2+ state in 20O has been observed. The results are compared with new shell model calculations.

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Emergence of the N=16 shell gap in 21O

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