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The sender generates $r$, can the receiver determine the value $r$ from the stealth address?

Thanks.

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Assuming that by stealth address you mean the output one time key, then no, it it not possible. r is the secret key corresponding to the R public key which gets included in the transaction. The recipient will use that public key only, and never learn r, using the fact that aR == rA.

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No. Only the sender knows r and the sender would only use/persist r to later prove a payment made. The receiver cannot derive r, which is a random scalar created by the sender and used as the point multiplier on the receivers public view key.

A great article on stealth addresses can be found here.

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