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

被引：156

作者：

Birkhan, J. ^{[1
]}

Miorelli, M. ^{[2
,3
]}

Bacca, S. ^{[2
,4
]}

Bassauer, S. ^{[1
]}

Bertulani, C. A. ^{[5
]}

Hagen, G. ^{[6
,7
]}

Matsubara, H. ^{[8
,9
]}

von Neumann-Cosel, P. ^{[1
]}

Papenbrock, T. ^{[6
,7
]}

Pietralla, N. ^{[1
]}

Ponomarev, V. Yu. ^{[1
]}

Richter, A. ^{[1
]}

Schwenk, A. ^{[1
,10
,11
]}

Tamii, A. ^{[8
]}

机构：

[1] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[2] TRIUMF, 4004Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[3] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T IZ4, Canada

[4] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

[5] Texas A&M Univ Commerce, Dept Phys & Astron, Commerce, TX 75429 USA

[6] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

[7] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[8] Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan

[9] Tokyo Womens Med Univ, Shinjuku Ku, 8-1 Kawada cho, Tokyo 1628666, Japan

[10] GSI Helmholtzzentrum Schwerionenforschung GmbH, ExtreMe Matter Inst EMMI, D-64291 Darmstadt, Germany

[11] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 25期

基金：

加拿大自然科学与工程研究理事会;

关键词：

PHOTONUCLEAR CROSS-SECTIONS; EQUATION-OF-STATE; SYMMETRY ENERGY; PROTON-SCATTERING; GIANT-RESONANCES; NUCLEAR-FORCES; EXCITATION; COLLISIONS; DENSITIES; MATTER;

D O I：

10.1103/PhysRevLett.118.252501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electric dipole strength distribution in Ca-48 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 alpha(D) (Ca-48) = 2.07(22) fm(3). Remarkably, the dipole response of Ca-48 is found to be very similar to that of Ca-40, consistent with a small neutron skin in Ca-48. 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 Ca-48 of 0.14-0.20 fm.

引用

页数：6

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