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

J. Birkhan; M. Miorelli; S. Bacca; S. Bassauer; C. A. Bertulani; G. Hagen; H. Matsubara; P. Von Neumann-Cosel; T. Papenbrock; N. Pietralla; V. Yu Ponomarev; A. Richter; A. Schwenk; A. Tamii

doi:10.1103/PhysRevLett.118.252501

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

J. Birkhan, M. Miorelli, S. Bacca, S. Bassauer, C. A. Bertulani, G. Hagen, H. Matsubara, P. Von Neumann-Cosel, T. Papenbrock, N. Pietralla, V. Yu Ponomarev, A. Richter, A. Schwenk, A. Tamii

Theoretical and Computational Physics

Research output: Contribution to journal › Article › peer-review

143 Scopus citations

Abstract

The electric dipole strength distribution in Ca48 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 first extraction of the electric dipole polarizability αD(Ca48)=2.07(22) fm3. Remarkably, the dipole response of Ca48 is found to be very similar to that of Ca40, consistent with a small neutron skin in Ca48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca48 of 0.14-0.20 fm.

Original language	English
Article number	252501
Journal	Physical Review Letters
Volume	118
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.118.252501
State	Published - Jun 23 2017

Funding

We thank W. Nazarewicz and X. Roca-Maza for useful discussions, and J. Lynn for a critical reading of the manuscript. This work was supported by the DFG, Grant No.SFB 1245, JSPS KAKENHI Grant No.JP14740154, MEXT KAKENHI Grant No.JP25105509, NSERC Grant No.SAPIN-2015-00031, the U.S. DOE Grants No.DE-FG02-08ER41533 (Texas A&M University-Commerce), No.DE-FG02-96ER40963, and No.DE-SC0008499 (NUCLEI SciDAC collaboration), and the Field Work Proposal ERKBP57 at Oak Ridge National Laboratory (ORNL). TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. Computer time was provided by the INCITE program. This research used computing resources at TRIUMF and of the Oak Ridge Leadership Computing Facility supported by the U.S. DOE under Contract No.DE-AC05-00OR22725. This manuscript has been authored by UT-Battelle, LLC under Contract No.DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive paid-up irrevocable worldwide license to publish or reproduce the published form of this manuscript or allow others to do so for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan.

Funders	Funder number
United States Government
U.S. Department of Energy
Oak Ridge National Laboratory
Texas A and M University-Commerce
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Deutsche Forschungsgemeinschaft	1245
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology

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10.1103/PhysRevLett.118.252501

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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. Y., Richter, A., Schwenk, A., & Tamii, A. (2017). Electric Dipole Polarizability of Ca 48 and Implications for the Neutron Skin. Physical Review Letters, 118(25), Article 252501. https://doi.org/10.1103/PhysRevLett.118.252501

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title = "Electric Dipole Polarizability of Ca 48 and Implications for the Neutron Skin",

abstract = "The electric dipole strength distribution in Ca48 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 first extraction of the electric dipole polarizability αD(Ca48)=2.07(22) fm3. Remarkably, the dipole response of Ca48 is found to be very similar to that of Ca40, consistent with a small neutron skin in Ca48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca48 of 0.14-0.20 fm.",

author = "J. Birkhan and M. Miorelli and S. Bacca and S. Bassauer and Bertulani, {C. A.} and G. Hagen and H. Matsubara and {Von Neumann-Cosel}, P. and T. Papenbrock and N. Pietralla and Ponomarev, {V. Yu} and A. Richter and A. Schwenk and A. Tamii",

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Birkhan, J, Miorelli, M, Bacca, S, Bassauer, S, Bertulani, CA, Hagen, G, Matsubara, H, Von Neumann-Cosel, P, Papenbrock, T, Pietralla, N, Ponomarev, VY, Richter, A, Schwenk, A & Tamii, A 2017, 'Electric Dipole Polarizability of Ca 48 and Implications for the Neutron Skin', Physical Review Letters, vol. 118, no. 25, 252501. https://doi.org/10.1103/PhysRevLett.118.252501

TY - JOUR

T1 - Electric Dipole Polarizability of Ca 48 and Implications for the Neutron Skin

AU - Birkhan, J.

AU - Miorelli, M.

AU - Bacca, S.

AU - Bassauer, S.

AU - Bertulani, C. A.

AU - Hagen, G.

AU - Matsubara, H.

AU - Von Neumann-Cosel, P.

AU - Papenbrock, T.

AU - Pietralla, N.

AU - Ponomarev, V. Yu

AU - Richter, A.

AU - Schwenk, A.

AU - Tamii, A.

PY - 2017/6/23

Y1 - 2017/6/23

N2 - The electric dipole strength distribution in Ca48 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 first extraction of the electric dipole polarizability αD(Ca48)=2.07(22) fm3. Remarkably, the dipole response of Ca48 is found to be very similar to that of Ca40, consistent with a small neutron skin in Ca48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca48 of 0.14-0.20 fm.

AB - The electric dipole strength distribution in Ca48 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 first extraction of the electric dipole polarizability αD(Ca48)=2.07(22) fm3. Remarkably, the dipole response of Ca48 is found to be very similar to that of Ca40, consistent with a small neutron skin in Ca48. The experimental results are in good agreement with ab initio calculations based on chiral effective field theory interactions and with state-of-the-art density-functional calculations, implying a neutron skin in Ca48 of 0.14-0.20 fm.

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

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