On the hard $gamma$-ray spectrum of the potential PeVatron supernova remnant G106.3+2.7

The Tibet AS$gamma$ experiment has measured $gamma$-ray flux of supernova remnant G106.3+2.7 up to 100 TeV, suggesting it {being} potentially a PeVatron. Challenge arises when the hadronic scenario requires a hard proton spectrum (with spectral index $approx 1.8$), while {usual observations and numerical simulations prefer} a soft proton spectrum {(with spectral index $geq 2$)}. In this paper, we explore an alternative scenario to explain the $gamma$-ray spectrum of G106.3+2.7 within the current understanding of acceleration and escape processes. We consider that the cosmic ray {particles} are scattered by the turbulence driven via Bell instability. The resulting hadronic $gamma$-ray spectrum is novel, dominating the contribution to the emission above 10,TeV, and can explain the bizarre broadband spectrum of G106.3+2.7 in combination with leptonic emission from the remnant.