{
  "id": "1211.5871",
  "version": "v2",
  "published": "2012-11-26T07:26:45.000Z",
  "updated": "2012-12-04T03:05:19.000Z",
  "title": "Collective excitations of $Λ$ hypernuclei",
  "authors": [
    "K. Hagino",
    "J. M. Yao",
    "F. Minato",
    "Z. P. Li",
    "M. Thi Win"
  ],
  "comment": "8 pages, 5 figures. A talk given at XI International Conference on Hypernuclear and Strange Particle Physics (HYP2012), Oct. 1-5, 2012, Barcelona, Spain",
  "categories": [
    "nucl-th",
    "nucl-ex"
  ],
  "abstract": "We discuss low-lying collective excitations of $\\Lambda$ hypernuclei using the self-consistent mean-field approaches. We first discuss the deformation properties of $\\Lambda$ hypernuclei in the $sd$-shell region. Based on the relativistic mean-field (RMF) approach, we show that the oblate deformation for $^{28}$Si nucleus may disappear when a $\\Lambda$ particle is added to this nucleus. We then discuss the rotational excitations of $^{25}_{\\Lambda}$Mg nucleus using the three-dimensional potential energy surface in the deformation plane obtained with the Skyrme-Hartree-Fock method. The deformation of $^{25}_{\\Lambda}$Mg nucleus is predicted to be slightly reduced due to an addition of $\\Lambda$ particle. We demonstrate that this leads to a reduction of electromagnetic transition probability, $B(E2)$, in the ground state rotational band. We also present an application of random phase approximation (RPA) to hypernuclei, and show that a new dipole mode, which we call a soft dipole $\\Lambda$ mode, appears in hypernuclei, which can be interpreted as an oscillation of $\\Lambda$ particle against the core nucleus.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-12-04T03:05:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "collective excitations",
      "hypernuclei",
      "ground state rotational band",
      "mg nucleus",
      "three-dimensional potential energy surface"
    ],
    "tags": [
      "conference paper",
      "journal article"
    ],
    "publication": {
      "doi": "10.1016/j.nuclphysa.2012.12.077",
      "journal": "Nuclear Physics A",
      "year": 2013,
      "month": "Sep",
      "volume": 914,
      "pages": 151
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1203888,
      "adsabs": "2013NuPhA.914..151H"
    }
  }
}