Two-Neutron Halo is Unveiled in F 29

We report the measurement of reaction cross sections (σexR) of 27,29F with a carbon target at RIKEN. The unexpectedly large σexR and derived matter radius identify 29F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p3/2 orbital, thereby vanishin...

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Veröffentlicht in:	Physical review letters 2020-06, Vol.124 (22), Article 222504
Hauptverfasser:	Bagchi, S., Kanungo, R., Tanaka, Y. K., Geissel, H., Doornenbal, P., Horiuchi, W., Hagen, G., Suzuki, T., Tsunoda, N., Ahn, D. S., Baba, H., Behr, K., Browne, F., Chen, S., Cortés, M. L., Estradé, A., Fukuda, N., Holl, M., Itahashi, K., Iwasa, N., Jansen, G. R., Jiang, W. G., Kaur, S., Macchiavelli, A. O., Matsumoto, S. Y., Momiyama, S., Murray, I., Nakamura, T., Novario, S. J., Ong, H. J., Otsuka, T., Papenbrock, T., Paschalis, S., Prochazka, A., Scheidenberger, C., Schrock, P., Shimizu, Y., Steppenbeck, D., Sakurai, H., Suzuki, D., Suzuki, H., Takechi, M., Takeda, H., Takeuchi, S., Taniuchi, R., Wimmer, K., Yoshida, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	NUCLEAR PHYSICS AND RADIATION PHYSICS
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Zusammenfassung:	We report the measurement of reaction cross sections (σexR) of 27,29F with a carbon target at RIKEN. The unexpectedly large σexR and derived matter radius identify 29F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p3/2 orbital, thereby vanishing the shell closure associated with the neutron number N=20. The results are explained by state-of-the-art shell model calculations. Coupled-cluster computations based on effective field theories of the strong nuclear force describe the matter radius of 27F but are challenged for 29F.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.124.222504