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2 results on '"S. V. Pineda"'

1. Implications of the ^{36}Ca-^{36}S and ^{38}Ca-^{38}Ar difference in mirror charge radii on the neutron matter equation of state

Author

B. A. Brown, K. Minamisono, J. Piekarewicz, H. Hergert, D. Garand, A. Klose, K. König, J. D. Lantis, Y. Liu, B. Maaß, A. J. Miller, W. Nörtershäuser, S. V. Pineda, R. C. Powel, D. M. Rossi, F. Sommer, C. Sumithrarachchi, A. Teigelhöfer, J. Watkins, and R. Wirth

Subjects
Physics, QC1-999
Abstract

Charge radii of the unstable ^{36}Ca and ^{38}Ca nuclei were recently determined and used to compute differences in charge radii between mirror nuclei ΔR_{ch} for the ^{36}Ca−^{36}S and ^{38}Ca−^{38}Ar mirror pairs. Given the correlation between ΔR_{ch} and the slope of the symmetry energy L at the nuclear saturation density, we deduce L=5–70 MeV, which rules out a large fraction of models that predict a “stiff” equation of state. This is the most precise determination of L in this model based on electromagnetic probes of nuclear ground states. The determined range is consistent with earlier analyses from both laboratory experiments and astrophysical observations, including the recent detection of gravitational waves from the merger of two neutron stars.

Published
2020
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2. Proton superfluidity and charge radii in proton-rich calcium isotopes

Author

B. Maaß, A. Klose, Wilfried Nörtershäuser, Felix Sommer, Paul-Gerhard Reinhard, C. Kujawa, Witold Nazarewicz, Yuan Liu, D. M. Rossi, Chandana Sumithrarachchi, D. Garand, Jeremy Lantis, P. F. Mantica, J. Watkins, A. Teigelhöfer, Kei Minamisono, A. J. Miller, and S. V. Pineda

Subjects
Physics, Proton, Nuclear Theory, General Physics and Astronomy, Charge (physics), 01 natural sciences, Effective nuclear charge, 010305 fluids & plasmas, Charge radius, 0103 physical sciences, Atomic nucleus, Nuclear force, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nuclear density
Abstract

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 theory1. 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 interaction2 and a state-of-the-art theoretical method can successfully explain the behaviour of charge radii from the lightest to the heaviest Ca isotopes. 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. Spectral study on 36,37,38Ca isotopes and calculations based on density functional theory reveal the interplay between charge radii and nucleonic pairing correlations.

Published
2019

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