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Title: Electric Dipole Polarizability of Ca 48 and Implications for the Neutron Skin

Abstract

The electric dipole strength distribution in 48Ca between 5 and 25 MeV has been determined at RCNP, Osaka, from proton inelastic scattering experiments at forward angles. Combined with photoabsorption data at higher excitation energy, this enables the rst extraction of the electric dipole polarizability D(48Ca) = 2:07(22) fm3. Remarkably, the dipole response of 48Ca is found to be very similar to that of 40Ca, consistent with a small neutron skin in 48Ca. The experimental results are in good agreement with ab initio calculations based on chiral e ective eld theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in 48Ca of 0:14 - 0:20 fm.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [1];  [5];  [1];  [1];  [1];  [7];  [8]
  1. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik
  2. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
  3. TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
  4. Texas A & M Univ., Commerce, TX (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Osaka Univ. (Japan); Tokyo Women's Medical Univ. (Japan)
  7. Technische Univ. Darmstadt (Germany). Inst. fur Kernphysik; Max Planck Inst. fur Kernphysik, Heidelberg (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  8. Osaka Univ. (Japan)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1394473
Alternate Identifier(s):
OSTI ID: 1366338
Grant/Contract Number:  
AC05-00OR22725; FG02-08ER41533; FG02-96ER40963; SC0008499
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 25; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Birkhan, J., Miorelli, M., Bacca, S., Bassauer, S., Bertulani, C. A., Hagen, G., Matsubara, H., von Neumann-Cosel, P., Papenbrock, T., Pietralla, N., Ponomarev, V. Yu., Richter, A., Schwenk, A., and Tamii, A. Electric Dipole Polarizability of Ca48 and Implications for the Neutron Skin. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.118.252501.
Birkhan, J., Miorelli, M., Bacca, S., Bassauer, S., Bertulani, C. A., Hagen, G., Matsubara, H., von Neumann-Cosel, P., Papenbrock, T., Pietralla, N., Ponomarev, V. Yu., Richter, A., Schwenk, A., & Tamii, A. Electric Dipole Polarizability of Ca48 and Implications for the Neutron Skin. United States. doi:10.1103/PhysRevLett.118.252501.
Birkhan, J., Miorelli, M., Bacca, S., Bassauer, S., Bertulani, C. A., Hagen, G., Matsubara, H., von Neumann-Cosel, P., Papenbrock, T., Pietralla, N., Ponomarev, V. Yu., Richter, A., Schwenk, A., and Tamii, A. Fri . "Electric Dipole Polarizability of Ca48 and Implications for the Neutron Skin". United States. doi:10.1103/PhysRevLett.118.252501. https://www.osti.gov/servlets/purl/1394473.
@article{osti_1394473,
title = {Electric Dipole Polarizability of Ca48 and Implications for the Neutron Skin},
author = {Birkhan, J. and Miorelli, M. and Bacca, S. and Bassauer, S. and Bertulani, C. A. and Hagen, G. and Matsubara, H. and von Neumann-Cosel, P. and Papenbrock, T. and Pietralla, N. and Ponomarev, V. Yu. and Richter, A. and Schwenk, A. and Tamii, A.},
abstractNote = {The electric dipole strength distribution in 48Ca between 5 and 25 MeV has been determined at RCNP, Osaka, from proton inelastic scattering experiments at forward angles. Combined with photoabsorption data at higher excitation energy, this enables the rst extraction of the electric dipole polarizability D(48Ca) = 2:07(22) fm3. Remarkably, the dipole response of 48Ca is found to be very similar to that of 40Ca, consistent with a small neutron skin in 48Ca. The experimental results are in good agreement with ab initio calculations based on chiral e ective eld theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in 48Ca of 0:14 - 0:20 fm.},
doi = {10.1103/PhysRevLett.118.252501},
journal = {Physical Review Letters},
number = 25,
volume = 118,
place = {United States},
year = {2017},
month = {6}
}

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