Proton superfluidity and charge radii in proton-rich calcium isotopes

Miller, Andrew J.; Minamisono, Kei; Klose, A.; Garand, David; Kujawa, C.; Lantis, J. D.; Liu, Yuan; Maaß, B.; Mantica, P. F.; Nazarewicz, W.; Nörtershäuser, W.; Pineda, S. V.; Reinhard, P. -G.; Rossi, D. M.; Sommer, F.; Sumithrarachchi, C.; Teigelhöfer, A.; Watkins, J.

doi:10.1038/s41567-019-0416-9

Title: Proton superfluidity and charge radii in proton-rich calcium isotopes

Journal Article · 11 February 2019 · Nature Physics

DOI: https://doi.org/10.1038/s41567-019-0416-9 · OSTI ID:1528704

Miller, Andrew J. ^[1];

^[1];

^[2]; Garand, David ^[1]; Kujawa, C. ^[2]; Lantis, J. D. ^[1];

^[3]; Maaß, B. ^[4]; Mantica, P. F. ^[1]; Nazarewicz, W. ^[1];

^[4]; Pineda, S. V. ^[2]; Reinhard, P. -G. ^[5]; Rossi, D. M. ^[4]; Sommer, F. ^[4]; Sumithrarachchi, C. ^[1]; Teigelhöfer, A. ^[6]; Watkins, J. ^[1]

Michigan State Univ., East Lansing, MI (United States)
Augustana College, Sioux Falls, SD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Technische Universität Darmstadt (Germany)
Universität Erlangen (Germany)
TRIUMF, Vancouver, BC (Canada)

We report that one of the most important global properties of the atomic nucleus is its size. Experimentally determined nuclear charge radii carry unique information on the nuclear force and complex dynamics of protons and neutrons moving inside the nucleus. The intricate behaviour of charge radii along the chain of Ca isotopes, including the unexpectedly large charge radius of neutron-rich ⁵²Ca, poses a daunting challenge for nuclear theory. Here we present the measurements of the charge radii of proton-rich isotopes ^36,37,38Ca, whose properties are impacted by the interplay between nuclear superfluidity and weak binding. Calculations carried out within nuclear density functional theory show that the combination of a novel interaction and a state-of-the-art theoretical method can successfully explain the behaviour of charge radii from the lightest to the heaviest Ca isotopes. Lastly, through this model, we show how the new data on ^36,37,38Ca elucidate the nature of nucleonic pairing in weakly bound proton-rich isotopes.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-00OR22725; NA0002924; SC0013365; SC0018083

OSTI ID:: 1528704

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 5 Vol. 15; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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