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Fundamentals in Nuclear Physics: From Nuclear Structure to by Jean-Louis Basdevant, James Rich, Michael Spiro

By Jean-Louis Basdevant, James Rich, Michael Spiro

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Quantum optics: quantum theories of spontaneous emission

The aim of this text is to check spontaneous emission from numerous diversified viewpoints, even though a wide a part of it will likely be dedicated to the quantum statistical theories of spontaneous emission that have been constructed lately, and to discussing the interrelations between diversified ways.

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109) conspires to conserve a quantity associated with a time-independent operator A. 109) and its Hermitian conjugate. We see that the expectation value is time independent if the operator commutes with H. In nuclear physics, we are generally interested in transitions between states and we would like to see how selection rules that constrain the transitions are generated. Consider the transition amplitude of a system from an initial state |i to a final state |f , both eigenstates of a Hamiltonian H0 , due to a transition Hamiltonian HT .

12. The most important contributions to the nucleon–nucleon potentials in the s = 0 state (left) and the s = 1 state (right) (the so-called Paris potential). The two central potentials VC depend only on the relative separations. 59) is responsible for the deuteron binding and for its quadrupole moment. The spin-orbit potential is VSO . 38 1. 61) where L is the orbital angular momentum operator for the nucleon pair. 12 shows the most important contributions to the nucleon– nucleon potential [23].

6. For this nucleus, their are groups of excited states with energies ¯ ω(n + 3/2) En = h n = 0, 1, 2..... 39) More striking are the rotational levels of 242 Pu in the same figure. The classical kinetic energy of a rigid rotor is L2 /2I where L is the angular momentum and I is the moment of inertia about the rotation axis. For a quantum rotor like the 242 Pu nucleus, the quantization of angular momentum then implies a spectrum of states of energy L2 h2 J(J + 1) ¯ = J = 0, 2, 4...... 40) 2I 2I where J is the angular momentum quantum number.

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