{
  "id": "1203.3687",
  "version": "v1",
  "published": "2012-03-16T12:39:38.000Z",
  "updated": "2012-03-16T12:39:38.000Z",
  "title": "Role of momentum transfer in the quenching of Gamow-Teller strength",
  "authors": [
    "T. Marketin",
    "G. Martínez-Pinedo",
    "N. Paar",
    "D. Vretenar"
  ],
  "comment": "23 pages, 7 figures, 3 tables, submitted to Physical Review C",
  "journal": "Phys. Rev. C 85, 054313 (2012)",
  "categories": [
    "nucl-th",
    "nucl-ex"
  ],
  "abstract": "The relativistic proton-neutron quasiparticle random phase approximation (pn-RQRPA) is applied in the calculation of the L=0 strength in charge-exchange reactions on $^{48}$Ca, $^{90}$Zr, $^{208}$Pb and nuclei in the Sn isotopic chain. The microscopic theoretical framework is based on the relativistic Hartree-Bogoliubov (RHB) model for the nuclear ground state. The calculation is fully self-consistent, i.e. the same interaction is used both in the RHB equations that determine the quasiparticle basis, and in the matrix equations of the pn-RQRPA. The inclusion of the higher-order terms that include the effect of finite momentum transfer, primarily the isovector spin monopole (IVSM) term, in the transition operator shifts a portion of the strength to the high-energy region above the Gamow-Teller (GT) resonance. The total strength is slightly enhanced in nuclei with small neutron-to-proton ratio but remains unchanged with increasing neutron excess. Based on the strength obtained using the full L=0 transition operator in the pn-RQRPA calculation, we have estimated the impact of the IVSM on the strength measured in the charge-exchagne reactions on $^{90}$Zr and found that the data are consistent with the Ikeda sum rule.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-03-16T12:39:38.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "25.40.Kv",
      "24.30.Cz",
      "21.60.Jz"
    ],
    "keywords": [
      "momentum transfer",
      "gamow-teller strength",
      "relativistic proton-neutron quasiparticle random phase",
      "proton-neutron quasiparticle random phase approximation",
      "transition operator"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review C",
      "doi": "10.1103/PhysRevC.85.054313",
      "year": 2012,
      "month": "May",
      "volume": 85,
      "number": 5,
      "pages": "054313"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1094096,
      "adsabs": "2012PhRvC..85e4313M"
    }
  }
}