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Recent high-resolution X-ray spectroscopy revealed possible presence ofcharge exchange (CX) X-ray emission in supernova remnants (SNRs). Although CXis expected to take place at outermost edges of SNR shells, no significantmeasurement has been reported so far due to the lack of nearby SNR samples.Here we present an X-ray study of SNR G296.1$-$0.5, which has a complicatedmultiple-shell structure, with the Reflection Grating Spectrometer (RGS)onboard XMM-Newton. We select two shells in different regions and find that inboth regions O VII line shows a high forbidden-to-resonance ($f/r$) ratio thatcannot be reproduced by a simple thermal model. Our spectral analysis suggestsa presence of CX and the result is also supported by our new radio observation,where we discover evidence of molecular clouds associated with these shells.Assuming G296.1$-$0.5 has a spherical shock, we estimate that CX is dominant ina thin layer with a thickness of 0.2--0.3\% of the shock radius. The result isconsistent with a previous theoretical expectation and we therefore concludethat CX occurs in G296.1$-$0.5.

Charge Exchange X-ray Emission Detected in Multiple Shells of Supernova Remnant G296.1-0.5