{
  "annotation_id": "244f19ca-9675-4471-8838-2c4965df574c",
  "date_created": "2026-02-17T05:53:15.436000Z",
  "date_modified": "2026-02-17T05:53:15.436000Z",
  "file_hash": "1f6c392e88e88d45ecbc0390015e53a9bdf930675be44f3aec8c1dcea93cec04",
  "private": false,
  "record": {
    "abstract": "Disentangling reaction mechanisms in weakly bound nuclei remains a long-standing challenge, often compounded by the treatment of absorption as an incoherent sum of channel contributions. Within the Continuum-Discretized Coupled-Channels (CDCC) framework, we derive a generalized coupled-channel optical theorem and show that the total absorption cross section, $\\sigma_{\\mathrm A}\\propto -\\langle\\Psi|W|\\Psi\\rangle$, decomposes as $\\sigma_{\\mathrm A}=\\sigma_{\\mathrm D}+\\sigma_{\\mathrm B}+\\sigma_{\\mathrm{int}}$, where $\\sigma_{\\mathrm{int}}$ is a coherent interference term between channel components. For the systems and fragment-target optical potentials considered, $\\sigma_{\\mathrm{int}}$ is negative and comparable in magnitude to the direct absorption terms. The off-diagonal imaginary couplings play a dual role, redistributing flux among channels and generating $\\sigma_{\\mathrm{int}}$, which is required for flux-balance consistency. Calculations for $d+{}^{93}\\mathrm{Nb}$ and ${}^{6}\\mathrm{Li}+{}^{59}\\mathrm{Co}/{}^{208}\\mathrm{Pb}$ show that retaining the full non-diagonal coupling matrix substantially enhances breakup-channel absorption for heavy targets while reducing the total absorption through interference effects. Neglecting off-diagonal imaginary couplings therefore leads to a systematically biased physical picture, overestimating total absorption and severely underestimating breakup contributions, implying that experimental analyses based on incoherent-sum models inherit this bias. Full-coupling CDCC calculations are thus essential for consistent, mechanism-resolved extraction of absorption cross sections in weakly bound systems.",
    "arxiv_id": "2601.08245",
    "authors": [
      "Hao Liu",
      "Jin Lei",
      "Zhongzhou Ren"
    ],
    "categories": [
      "nucl-th"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "title": "Coherent Absorption Dynamics: The Dual Role of Off-Diagonal Couplings in Weakly Bound Nuclei",
    "url": "https://arxiv.org/abs/2601.08245",
    "version": "v1"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "612a3b40-5b18-4f27-bcfd-fbd9d3e8e610",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}