Coherent Absorption Dynamics: The Dual Role of Off-Diagonal Couplings in Weakly Bound Nuclei

[2601.08245] Coherent Absorption Dynamics: The Dual Role of Off-Diagonal Couplings in Weakly Bound Nuclei Skip to main content Search Submit Donate Log in Nuclear Theory arXiv:2601.08245 (nucl-th) [Submitted on 13 Jan 2026 ( v1 ), last revised 27 Aug 2026 (this version, v3)] Title: Coherent Absorption Dynamics: The Dual Role of Off-Diagonal Couplings in Weakly Bound Nuclei Authors: Hao Liu , Jin Lei , Zhongzhou Ren View PDF HTML (experimental) Abstract: Disentangling reaction mechanisms in weakly bound nuclei remains a long-standing challenge, complicated by the common practice of treating absorption as an incoherent sum of channel contributions. Within the continuum-discretized coupled-channels (CDCC) framework, we apply the generalized optical theorem [Nucl. Phys. A 842, 48 (2010)] and show that the total absorption cross section, $\sigma_A \propto -\langle\Psi|W|\Psi\rangle$, decomposes as $\sigma_A = \sigma_D + \sigma_B + \sigma_{int}$, where $\sigma_{int}$ is a coherent interference term between channel components. For the systems and complex fragment-target optical potentials considered, $\sigma_{int}$ is negative and comparable in magnitude to the direct absorption terms. The off-diagonal imaginary couplings play a dual role: they redistribute flux among channels and generate $\sigma_{int}$, which is required for flux-balance consistency. In calculations for $d+^{93}$Nb and $^6$Li$+^{59}$Co/$^{208}$Pb, retaining the full non-diagonal coupling matrix nearly doubles the breakup-channel absorption for the heavy target, while reducing the total absorption through $\sigma_{int}$. Neglecting the off-diagonal imaginary couplings $W_{ij}$ ($i \neq j$) is not merely an approximation but leads to a systematically biased physical picture: the total absorption is overestimated while the breakup absorption component is severely underestimated. Experimental analyses that employ incoherent-sum models to extract direct and breakup cross sections from data will inherit this bias. The full coupling matrix is therefore essential for mechanism-resolved cross-section extraction, and we advocate that experimentalists adopt full-coupling CDCC calculations as the standard for consistent interpretation of absorption data in weakly bound systems. Comments: 12 pages, 6 figures, 3 tables. Published version Subjects: Nuclear Theory (nucl-th) Cite as: arXiv:2601.08245 [nucl-th] (or arXiv:2601.08245v3 [nucl-th] for this version) https://doi.org/10.48550/arXiv.2601.08245 Focus to learn more arXiv-issued DOI via DataCite Journal reference: Phys. Rev. C 113, 054601 (2026) Related DOI : https://doi.org/10.1103/bgwc-x5wj Focus to learn more DOI(s) linking to related resources Submission history From: Jin Lei [ view email ] [v1] Tue, 13 Jan 2026 06:05:02 UTC (148 KB) [v2] Mon, 19 Jan 2026 08:19:51 UTC (146 KB) [v3] Thu, 27 Aug 2026 05:25:16 UTC (177 KB) Full-text links: Access Paper: View PDF HTML (experimental) TeX Source view license Current browse context: nucl-th < prev | next > new | recent | 2026-01 References & Citations INSPIRE HEP NASA ADS Google Scholar Semantic Scholar export BibTeX citation Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer ( What is the Explorer? ) Connected Papers Toggle Connected Papers ( What is Connected Papers? ) Litmaps Toggle Litmaps ( What is Litmaps? ) scite.ai Toggle scite Smart Citations ( What are Smart Citations? ) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv ( What is alphaXiv? ) Links to Code Toggle CatalyzeX Code Finder for Papers ( What is CatalyzeX? ) DagsHub Toggle DagsHub ( What is DagsHub? ) GotitPub Toggle Gotit.pub ( What is GotitPub? ) Huggingface Toggle Hugging Face ( What is Huggingface? ) ScienceCast Toggle ScienceCast ( What is ScienceCast? ) Demos Demos Replicate Toggle Replicate ( What is Replicate? ) Spaces Toggle Hugging Face Spaces ( What is Spaces? ) Spaces Toggle TXYZ.AI ( What is TXYZ.AI? ) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower ( What are Influence Flowers? ) Core recommender toggle CORE Recommender ( What is CORE? ) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. 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