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Questions related from Yigang Yang
The low energy neutron's scattering cross section is σs, when the target nucleus could be deemed as bound. However, when the target nucleus is unbound, the scattering cross section is...
21 March 2023 6,043 2 View
We know that: 1. in the gamma-dacay, photon carries parities of (-1)^L and (-1)^L+1 for electric and magnetic transition, respectively. 2. the parity is conserved in the gamma-dacay, hence the...
23 October 2019 4,050 0 View
In the elastic scattering cross section curves of the neutron with various nuclei, some "dips", which are interpreted as the interference between potential scattering and resonance scattering, can...
03 November 2017 4,575 2 View
W. Heitler and Sow-Hsin Chen have introduced the derivation of photo-electric effect's cross section in the books of "The quantum theory of radiation: pp204" and "Interactions of Photons and...
25 August 2016 5,358 1 View
In the eV~keV energy, the neutron elastic scattering cross section is usually constant (if no resonance) which is determined by the potenial scattering. But, when the neutron energy goes to cold...
17 August 2016 3,240 8 View
The diffusion of molecules (for example: BBr3) in the atmosphere of N2 of 1torr is needed. Could anyone tell me how I can simulate this? Thank you.
16 January 2015 1,708 3 View
There is no 0-0 gamma decay because the photon must carry at least 1hbar (its spin) of angular momentum. My question is: Why the orbital angular momentum (L) and spin momentum (S) of the photon...
13 January 2015 9,498 2 View
Why the spectrum of virtual photons, which are exchanged between the energetic electron and the target nucleus, can always involve higher multipoles? For example, virtual photons have more E2...
01 January 1970 6,390 2 View
