{
  "id": "1012.1803",
  "version": "v1",
  "published": "2010-12-08T16:52:37.000Z",
  "updated": "2010-12-08T16:52:37.000Z",
  "title": "Pygmy Resonances and Neutron Skins",
  "authors": [
    "J. Piekarewicz"
  ],
  "journal": "Phys.Rev.C83:034319,2011",
  "doi": "10.1103/PhysRevC.83.034319",
  "categories": [
    "nucl-th",
    "nucl-ex"
  ],
  "abstract": "Motivated by a recent experiment, the distribution of electric dipole strength in the neutron-rich 68Ni isotope was computed using a relativistic random phase approximation with a set of effective interactions that - although well calibrated - predict significantly different values for the neutron-skin thickness in 208Pb. The emergence of low-energy \"Pygmy\" strength that exhausts about 5-8% of the energy weighted sum rule (EWSR) is clearly identified. In addition to the EWSR, special emphasis is placed on the dipole polarizability. In particular, our results suggest a strong correlation between the dipole polarizability of 68Ni and the neutron-skin thickness of 208Pb. Yet we find a correlation just as strong and an even larger sensitivity between the neutron-skin thickness of 208Pb and the fraction of the dipole polarizability exhausted by the Pygmy resonance. These findings suggest that the dipole polarizability may be used as a proxy for the neutron skin.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-12-08T16:52:37.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "21.60.Jz",
      "21.10.Re",
      "24.30.Gd",
      "21.10.Gv"
    ],
    "keywords": [
      "neutron skin",
      "pygmy resonance",
      "dipole polarizability",
      "neutron-skin thickness",
      "relativistic random phase approximation"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review C",
      "year": 2011,
      "month": "Mar",
      "volume": 83,
      "number": 3,
      "pages": "034319"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 880000,
      "adsabs": "2011PhRvC..83c4319P"
    }
  }
}