{"paper":{"title":"Disentangling the neutron skin of $^{48}$Ca from nuclear radius effects through $^{48}$Ca+$^{48}$Ca and $^{48}$Ti+$^{48}$Ti flow observables","arxiv_id":"2610.38424","primary_cat":"nucl-th","submitted_at":"2026-10-28T08:08:43+00:00","version_compiled":"v1"},"notice":"Every quoted sentence is the authors' text from the arXiv listing abstract. Labels and probabilities are the outputs of classifier-1.13.0 on the question bank abstract-p1-20260923, exactly as returned. No sentence in this record was written by a language model.","schema":"pith.compiled-record/v0","status":"compiled","abstract":{"source":"arXiv listing abstract v1","sentences":[{"i":0,"p":0.74,"id":"s0","own":false,"role":"gap","text":"The thickness of the neutron skin ($\\Delta r_{np}$) in $^{48}$Ca remains uncertain.","hedge":{"p":0.98,"label":"asserted"},"own_p":0.04,"main_claim_p":0.02,"quantitative":false,"quantitative_p":0.04,"role_probabilities":{"gap":0.74,"method":0.0,"result":0.0,"background":0.26,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":1,"p":0.97,"id":"s1","own":false,"role":"background","text":"CREX and ab initio calculations point to a thin skin, while many energy density functionals prefer larger values.","hedge":{"p":0.85,"label":"asserted"},"own_p":0.04,"main_claim_p":0.02,"quantitative":true,"quantitative_p":0.62,"role_probabilities":{"gap":0.03,"method":0.0,"result":0.0,"background":0.97,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":2,"p":0.62,"id":"s2","own":false,"role":"background","text":"Relativistic heavy-ion collisions can probe the skin through its geometric imprint on the quark-gluon plasma, but a thicker skin also changes the overall nuclear size, so the two effects are hard to separate.","hedge":{"p":0.79,"label":"asserted"},"own_p":0.04,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.14,"role_probabilities":{"gap":0.37,"method":0.0,"result":0.0,"background":0.62,"limitation":0.01,"future_work":0.0,"contribution":0.0,"interpretation":0.0}},{"i":3,"p":0.69,"id":"s3","own":true,"role":"method","text":"We resolve this by systematically comparing $^{48}$Ca+$^{48}$Ca and $^{48}$Ti+$^{48}$Ti collisions at $\\sqrt{s_{NN}}=5.02$ TeV using the AMPT model with string melting.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.94,"main_claim_p":0.04,"quantitative":true,"quantitative_p":0.91,"role_probabilities":{"gap":0.0,"method":0.69,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.31,"interpretation":0.0}},{"i":4,"p":0.98,"id":"s4","own":true,"role":"method","text":"For $^{48}$Ca, we take a zero-skin baseline and skins at the CREX lower and upper bounds.","hedge":{"p":0.9,"label":"asserted"},"own_p":0.89,"main_claim_p":0.02,"quantitative":true,"quantitative_p":0.77,"role_probabilities":{"gap":0.0,"method":0.98,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.02,"interpretation":0.0}},{"i":5,"p":0.98,"id":"s5","own":true,"role":"method","text":"As size references, we add $^{48}$Ti and a skin-free $^{48}$Ca with the same density parameters as $^{48}$Ti, which separates size from skin effects.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.88,"main_claim_p":0.03,"quantitative":false,"quantitative_p":0.32,"role_probabilities":{"gap":0.0,"method":0.98,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.02,"interpretation":0.0}},{"i":6,"p":0.99,"id":"s6","own":true,"role":"method","text":"The sensitivity to the $^{48}$Ti radius is tested using two choices for its Woods-Saxon radius, one of which reproduces the experimental rms radius.","hedge":{"p":0.91,"label":"asserted"},"own_p":0.87,"main_claim_p":0.02,"quantitative":true,"quantitative_p":0.53,"role_probabilities":{"gap":0.0,"method":0.99,"result":0.0,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.01,"interpretation":0.0}},{"i":7,"p":0.96,"id":"s7","own":true,"role":"result","text":"We find that the neutron skin is a purely geometric perturbation; the medium's transport response coefficients are unchanged, first-moment observables exhibit only modest sensitivity to $\\Delta r_{np}$, while second-moment observables respond much more strongly.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.96,"main_claim_p":0.67,"quantitative":true,"quantitative_p":0.93,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.96,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.04}},{"i":8,"p":0.79,"id":"s8","own":true,"role":"result","text":"The final-state covariance between flow and mean transverse momentum fluctuations, with its normalized correlation, is the most promising measurable probe.","hedge":{"p":0.72,"label":"asserted"},"own_p":0.88,"main_claim_p":0.42,"quantitative":false,"quantitative_p":0.19,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.79,"background":0.0,"limitation":0.0,"future_work":0.01,"contribution":0.01,"interpretation":0.19}},{"i":9,"p":0.95,"id":"s9","own":true,"role":"result","text":"The radius-matched $^{48}$Ca follows $^{48}$Ti closely, and the position of $^{48}$Ti relative to the skin configurations depends on its radius.","hedge":{"p":1.0,"label":"asserted"},"own_p":0.9,"main_claim_p":0.09,"quantitative":true,"quantitative_p":0.75,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.95,"background":0.0,"limitation":0.0,"future_work":0.0,"contribution":0.0,"interpretation":0.05}},{"i":10,"p":0.78,"id":"s10","own":true,"role":"interpretation","text":"These collisions, analyzed with second-moment and shape-size correlators, offer a promising independent constraint on the $^{48}$Ca neutron skin at the LHC.","hedge":{"p":0.86,"label":"hedged_possibility"},"own_p":0.71,"main_claim_p":0.52,"quantitative":false,"quantitative_p":0.08,"role_probabilities":{"gap":0.0,"method":0.0,"result":0.03,"background":0.0,"limitation":0.0,"future_work":0.03,"contribution":0.16,"interpretation":0.78}}]},"compiled":{"main_claim":{"p":0.55,"text":"These collisions, analyzed with second-moment and shape-size correlators, offer a promising independent constraint on the $^{48}$Ca neutron skin at the LHC.","location":"abstract s10","hedge_strength":{"p":0.86,"label":"hedged possibility"}},"provenance":{"route":{"via":"TypeSafe API","model":"classifier-1.13.0","endpoint":"https://api.typesafe.ai/v1/systemone","provider":"TypeSafe"},"packing":"one request per paper","requests":1,"input_tokens":8489,"cost_usd_reported":0.0},"compiled_at":"2026-10-30","bank_version":"abstract-p1-20260923","model_version":"classifier-1.13.0","abstract_states":{"claims_first":0.06,"states_limitation":0.39,"human_participants":0.01,"controlled_comparison":0.95,"randomized_assignment":0.01,"states_quantitative_result":0.26,"compares_with_prior_results":0.86,"mentions_code_or_data_availability":0.02},"evidential_basis":{"p":1.0,"value":"simulation or computation","probabilities":{"argument":0.0,"literature":0.0,"proof_or_derivation":0.0,"analysis_of_existing_data":0.0,"observation_or_experiment":0.0,"simulation_or_computation":1.0}},"contribution_type":{"p":0.99,"value":"simulation study","probabilities":{"review":0.0,"method_or_tool":0.01,"empirical_study":0.0,"simulation_study":0.99,"theoretical_result":0.0,"dataset_or_benchmark":0.0,"position_or_commentary":0.0}},"contribution_statement":{"p":0.98,"text":"We resolve this by systematically comparing $^{48}$Ca+$^{48}$Ca and $^{48}$Ti+$^{48}$Ti collisions at $\\sqrt{s_{NN}}=5.02$ TeV using the AMPT model with string melting.","location":"abstract s3"}},"coverage":{"tier":"abstract","levels_run":["P abstract"],"not_examined":["full text","figures and tables","references and citing sentences","relations to other papers"],"sources_read":["arXiv listing abstract v1"],"levels_not_run":["S sections","T body sentences","C citations","R cross-paper relations"],"sentences_examined":11,"sentences_in_abstract":11},"measured_accuracy":{"url":"https://pith.science/accuracy","measured_on":"2026-10-02","method":"two independent model families labelled a fresh random sample blind; 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