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Supernova remnant (SNR)\,W28 is well known for its classic hadronic scenario,in which the TeV cosmic rays (CRs) released at the early stage of this mid-agedSNR are illuminating nearby molecular clouds (MCs). Overwhelming evidences haveshown that the northeast of the SNR (W28-North) has already encountered withthe MC clumps. Through this broken shell -- W28-North, we believe the CRs withenergy down to $<$1\,GeV to be able to be injected into nearby MCs. To furthertestify this hadronic scenario, we first analyse the 9 years Fermi-LAT datain/around W28 with energy down to 0.3\,GeV. Our Fermi-LAT analysis display a10-200 GeV skymap which spatially matches well with the known TeV sources --HESS\,J1801-233 (W28-North), HESS\,J1800-240\,A,\,B\,\&\,C (240\,A\,B\,\&\,C).At low energy band, we has discovered a 0.5-1\,GeV blob located to the south of240\,B\,\&\,C, and a low flux of 0.3-1\,GeV at 240\,A. A hadronic model isbuild to explain our analysis results and previous multi-wavelengthobservations of W28. Our model consists of three CR sources: The run-away CRsescaped from a strong shock; The leaked GeV CRs from the broken shell --W28-North; And the local CR sea. Through modelling the SNR evolution, CRacceleration\,\&\,releasing, we have explained the GeV-TeV emission in/aroundSNR\,W28 (except for 240\,A) in one model. Both the damping of the magneticwaves by the neutrals and the decreased acceleration efficiency are taken intoaccount in our model due to the mid-age of SNR W28.

Leaked GeV CRs from a broken shell: Explaining 9 years Fermi-LAT data of SNR W28