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Title: Charge radii of neon isotopes across the sd neutron shell

Abstract

We report on the changes in mean square charge radii of unstable neon nuclei relative to the stable {sup 20}Ne, based on the measurement of optical isotope shifts. The studies were carried out using collinear laser spectroscopy on a fast beam of neutral neon atoms. High sensitivity on short-lived isotopes was achieved thanks to nonoptical detection based on optical pumping and state-selective collisional ionization, which was complemented by an accurate determination of the beam kinetic energy. The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate {sup 17}Ne up to the neutron-rich {sup 28}Ne in the vicinity of the ''island of inversion.'' Within this range the charge radius is smallest for {sup 24}Ne with N=14 corresponding to the closure of the neutron d{sub 5/2} shell, while it increases toward both neutron shell closures, N=8 and N=20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes. In the neutron-deficient isotopes, structural changes arise from the onset of proton-halo formation for {sup 17}Ne, shell closure in {supmore » 18}Ne, and clustering effects in {sup 20,21}Ne. On the neutron-rich side the transition to the island of inversion plays an important role, with the radii in the upper part of the sd shell confirming the weakening of the N=20 magic number. The results add new information to the radii systematics of light nuclei where data are scarce because of the small contribution of nuclear-size effects to the isotope shifts which are dominated by the finite-mass effect.« less

Authors:
 [1]; ; ; ; ; ;  [1]; ;  [2];  [3];  [4];  [5]
  1. Institut fuer Physik, Universitaet Mainz, D-55099 Mainz (Germany)
  2. Physics Department, CERN, CH-1211 Geneva 23 (Switzerland)
  3. Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany)
  4. Laboratorium voor Vaste-Stoffysica en Magnetisme, K.U.Leuven, B-3001 Leuven (Belgium)
  5. Institut fuer Kernphysik, TU Darmstadt, D-64289 Darmstadt (Germany)
Publication Date:
OSTI Identifier:
21596744
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.84.034313; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DEFORMATION; DETECTION; IONIZATION; KINETIC ENERGY; LASER SPECTROSCOPY; NEON 17; NEON 18; NEON 20; NEON 21; NEON 24; NEON 28; NEUTRON-DEFICIENT ISOTOPES; NEUTRONS; NITROGEN 14; NITROGEN 20; NUCLEAR HALOS; NUCLEAR RADII; SENSITIVITY; SPECTRAL SHIFT; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; ELEMENTARY PARTICLES; ENERGY; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FERMIONS; HADRONS; ISOTOPES; LIGHT NUCLEI; MILLISECONDS LIVING RADIOISOTOPES; MINUTES LIVING RADIOISOTOPES; NEON ISOTOPES; NITROGEN ISOTOPES; NUCLEAR PROPERTIES; NUCLEI; NUCLEONS; ODD-ODD NUCLEI; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES; SPECTROSCOPY; STABLE ISOTOPES

Citation Formats

Marinova, K, Laboratory of Nuclear Reactions, Joint Institute of Nuclear Research, 141980 Dubna, Geithner, W, Kappertz, S, Kloos, S, Kotrotsios, G, Neugart, R, Wilbert, S, Kowalska, M, Keim, M, Blaum, K, Lievens, P, and Simon, H. Charge radii of neon isotopes across the sd neutron shell. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.034313.
Marinova, K, Laboratory of Nuclear Reactions, Joint Institute of Nuclear Research, 141980 Dubna, Geithner, W, Kappertz, S, Kloos, S, Kotrotsios, G, Neugart, R, Wilbert, S, Kowalska, M, Keim, M, Blaum, K, Lievens, P, & Simon, H. Charge radii of neon isotopes across the sd neutron shell. United States. doi:10.1103/PHYSREVC.84.034313.
Marinova, K, Laboratory of Nuclear Reactions, Joint Institute of Nuclear Research, 141980 Dubna, Geithner, W, Kappertz, S, Kloos, S, Kotrotsios, G, Neugart, R, Wilbert, S, Kowalska, M, Keim, M, Blaum, K, Lievens, P, and Simon, H. Thu . "Charge radii of neon isotopes across the sd neutron shell". United States. doi:10.1103/PHYSREVC.84.034313.
@article{osti_21596744,
title = {Charge radii of neon isotopes across the sd neutron shell},
author = {Marinova, K and Laboratory of Nuclear Reactions, Joint Institute of Nuclear Research, 141980 Dubna and Geithner, W and Kappertz, S and Kloos, S and Kotrotsios, G and Neugart, R and Wilbert, S and Kowalska, M and Keim, M and Blaum, K and Lievens, P and Simon, H},
abstractNote = {We report on the changes in mean square charge radii of unstable neon nuclei relative to the stable {sup 20}Ne, based on the measurement of optical isotope shifts. The studies were carried out using collinear laser spectroscopy on a fast beam of neutral neon atoms. High sensitivity on short-lived isotopes was achieved thanks to nonoptical detection based on optical pumping and state-selective collisional ionization, which was complemented by an accurate determination of the beam kinetic energy. The new results provide information on the structural changes in the sequence of neon isotopes all across the neutron sd shell, ranging from the proton drip line nucleus and halo candidate {sup 17}Ne up to the neutron-rich {sup 28}Ne in the vicinity of the ''island of inversion.'' Within this range the charge radius is smallest for {sup 24}Ne with N=14 corresponding to the closure of the neutron d{sub 5/2} shell, while it increases toward both neutron shell closures, N=8 and N=20. The general trend of the charge radii correlates well with the deformation effects which are known to be large for several neon isotopes. In the neutron-deficient isotopes, structural changes arise from the onset of proton-halo formation for {sup 17}Ne, shell closure in {sup 18}Ne, and clustering effects in {sup 20,21}Ne. On the neutron-rich side the transition to the island of inversion plays an important role, with the radii in the upper part of the sd shell confirming the weakening of the N=20 magic number. The results add new information to the radii systematics of light nuclei where data are scarce because of the small contribution of nuclear-size effects to the isotope shifts which are dominated by the finite-mass effect.},
doi = {10.1103/PHYSREVC.84.034313},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}