That phrase has no direct connection to S.N. Ghoshal or nuclear physics. If you meant to search for something else (e.g., a scientist's biography, or a different "S.N. Ghoshal" related to media/lifestyle), please clarify.
For exam preparation and competitive depth, focus on these key concepts frequently highlighted in the Google Books entry for S.N. Ghoshal : sn ghoshal nuclear physics pdf hot
Understanding how protons and neutrons occupy energy levels, leading to the famous "magic numbers" (2, 8, 20, 28, 50, 82, 126) that indicate nuclear stability. That phrase has no direct connection to S