Two-Neutron Halo is Unveiled in ^{29}F

Abstract

We report the measurement of reaction cross sections (σ_{R}^{ex}) of ^{27,29}F with a carbon target at RIKEN. The unexpectedly large σ_{R}^{ex} and derived matter radius identify ^{29}F as the heaviest two-neutron Borromean halo to date. The halo is attributed to neutrons occupying the 2p_{3/2} 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 ^{27}F but are challenged for ^{29}F.

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Item Type:	Article
Authors/Creators:	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. (sc2950@york.ac.uk) 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. https://orcid.org/0000-0002-9113-3778 Prochazka, A. Scheidenberger, C. Schrock, P. Shimizu, Y. Steppenbeck, D. Sakurai, H. Suzuki, D. Suzuki, H. Takechi, M. Takeda, H. Takeuchi, S. Taniuchi, R. https://orcid.org/0000-0002-8057-7074 Wimmer, K. Yoshida, K.
Copyright, Publisher and Additional Information:	© 2020 American Physical Society. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details
Dates:	Accepted: 8 May 2020 Published: 5 June 2020
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Health Sciences (York) The University of York > Faculty of Arts and Humanities (York) > Philosophy (York) The University of York > Faculty of Sciences (York) > Biology (York) The University of York > Faculty of Sciences (York) > Physics (York)
Depositing User:	Pure (York)
Date Deposited:	21 Jul 2020 16:00
Last Modified:	17 Sep 2025 02:04
Published Version:	https://doi.org/10.1103/PhysRevLett.124.222504
Status:	Published
Refereed:	Yes
Identification Number:	10.1103/PhysRevLett.124.222504
Related URLs:	http://www.scopus.com/inward/record.url?... http://arxiv.org/abs/2005.09492v1
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:163580

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Two-Neutron Halo is Unveiled in ^{29}F

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