Not really. This is one of the myths we Americans like to tell ourselves, but the Japanese Surrender had a lot more to do with the fact the USSR entered the Pacific War. Japan's goal in 1945 was not to win. They knew they were done. It was to get a favorable peace. One that let them keep some of their gains in China. When the USSR entered the war on August 8th, and started rolling up their Armies in a few days, they knew they had no real options. Eithere Japan could be entirely occuppied by the US, or partioned like Germany. And there were enough horror stories about what the soviets were doing in East Germany to make that an easy pick. The bombs, on the other hand, didn't do that much damage. They were relatively low kilotons, we had devastated Japans cities with conventional bombing and killed far more people that way.