Mod-01 Lec-23 Vibrational and Rotational levels

[@artashesasoyan6272]

ROTATIONAL MODES (53:30): The reason that there are no odd numbers of the angular momentum in rotational mode {0*hbar/(2I), 2*hbar/(2I), 4*hbar/(2I), ...} is because the nuclei is a quantum object and its wavefunction has a positive parity. In other words, as he says, the nuclei has a mirror symmetry, so its (spacial part of) wavefunction must be symmetric psi(-x) = psi(x) even function has a "+" parity. So in order to have a positive parity (-1)^L the angular momentum L must be even!

[@shabirdar8281]

Awesome Sir. Allah bless you.

[@fortunemhlanga7651]

Best lecture ever for Nuclear Physics.

[@artashesasoyan6272]

Thank you, your lecture gave me a basis to understand theoreical books.

[@PrashantKumar-vq4nb]

#GOAT

[@CoyBoyRoy]

Excellent lecture. Thank you so much.

[@ParthPaTeL-wm3kt]

Very very informative, thank you sir

[@VishalSingh-ur6hc]

Why we have nuclear rotation only in even even nuclei not odd odd nuclei

[@surajpradhan8606]

Because, there are very few odd-odd nuclei and all of them have low mass number A. The deformation of nuclear shape is appreciable for nuclei having A > 150. So, that's why rotational energy for odd-odd nuclei is not that important.

[@ashishapatil19]

@@surajpradhan8606 Then what about Odd A nuclei? [( Even -odd) (odd- even) combination]

[@aryasingh8794]

Is it not possible to interpret that during vibration of an atom or molecule . .since electron possess spin angular momentum there might be possibility that nuclei are also in motion

[@jiregnaamsalu6725]

thank you very much!! interesting

[@shilpab9]

very nice sir :) tqsm :)

[@anesurrahaman7825]

thnxs

[@sayujya3]

What is this lambda means

[@ashishapatil19]

To distinguish shape changing nuclei from normal nuclei, in case of vibration, l= lambda and ml = mu is considered.