{
  "id": "2306.08377",
  "version": "v1",
  "published": "2023-06-14T09:08:20.000Z",
  "updated": "2023-06-14T09:08:20.000Z",
  "title": "Manipulation of Giant Multipole Resonances via Vortex $γ$ Photons",
  "authors": [
    "Zhi-Wei Lu",
    "Liang Guo",
    "Zheng-Zheng Li",
    "Mamutjan Ababekri",
    "Fang-Qi Chen",
    "Changbo Fu",
    "Chong Lv",
    "Ruirui Xu",
    "Xiangjin Kong",
    "Yi-Fei Niu",
    "Jian-Xing Li"
  ],
  "categories": [
    "nucl-th"
  ],
  "abstract": "Traditional photonuclear reactions primarily excite giant dipole resonances, making the measurement of isovector giant resonances with higher multipolarties a great challenge. In this work, the manipulation of collective excitations of different multipole transitions in nuclei via vortex $\\gamma$ photons has been investigated. We develop the calculation method for photonuclear cross sections induced by the vortex $\\gamma$ photon beam using the fully self-consistent random-phase approximation plus particle-vibration coupling (RPA+PVC) model based on Skyrme density functional. We find that the electromagnetic transitions with multipolarity $J< m_\\gamma$ are forbidden for vortex $\\gamma$ photons due to the angular momentum conservation, with $m_\\gamma$ being the projection of total angular momentum of $\\gamma$ photon on its propagation direction. For instance, this allows for probing the isovector giant quadrupole resonance without interference from dipole transitions using vortex $\\gamma$ photons with $m_\\gamma=2$. The electromagnetic transitions with $J>m_\\gamma$ are strongly suppressed compared with the plane-wave-$\\gamma$-photon case, and even vanish at specific polar angles. Therefore, the giant resonances with specific multipolarity can be extracted via vortex $\\gamma$ photons. Moreover, the vortex properties of $\\gamma$ photons can be meticulously diagnosed by measuring the nuclear photon-absorption cross section. Our method opens new avenues for photonuclear excitations, generation of coherent $\\gamma$ photon laser and precise detection of vortex particles, and consequently, has significant impact on nuclear physics, nuclear astrophysics and strong laser physics.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-06-14T09:08:20.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "giant multipole resonances",
      "excite giant dipole resonances",
      "self-consistent random-phase approximation plus",
      "random-phase approximation plus particle-vibration",
      "reactions primarily excite giant"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}