Proton Distribution Radii of O 16-24: Signatures of New Shell Closures and Neutron Skin

S. Kaur, R. Kanungo, W. Horiuchi, G. Hagen, J. D. Holt, B. S. Hu, T. Miyagi, T. Suzuki, F. Ameil, J. Atkinson, Y. Ayyad, S. Bagchi, D. Cortina-Gil, I. Dillmann, A. Estradé, A. Evdokimov, F. Farinon, H. Geissel, G. Guastalla, R. JanikR. Knöbel, J. Kurcewicz, Yu A. Litvinov, M. Marta, M. Mostazo, I. Mukha, C. Nociforo, H. J. Ong, T. Otsuka, S. Pietri, A. Prochazka, C. Scheidenberger, B. Sitar, P. Strmen, M. Takechi, J. Tanaka, I. Tanihata, S. Terashima, J. Vargas, H. Weick, J. S. Winfield

Research output: Contribution to journalArticlepeer-review


The root mean square radii of the proton density distribution in O16-24 derived from measurements of charge changing cross sections with a carbon target at ∼900A MeV together with the matter radii portray thick neutron skin for O22-24 despite O22,24 being doubly magic. Imprints of the shell closures at N=14 and 16 are reflected in local minima of their proton radii that provide evidence for the tensor interaction causing them. The radii agree with ab initio calculations employing the chiral NNLOsat interaction, though skin thickness predictions are challenged. Shell model predictions agree well with the data.

Original languageEnglish
Article number142502
JournalPhysical Review Letters
Issue number14
StatePublished - Sep 30 2022
Externally publishedYes


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