Neutron Scattering: Why Hydrogen is Negative

  • Thread starter Thread starter nittopuran
  • Start date Start date
  • Tags Tags
    Neutron Scattering
nittopuran
Messages
1
Reaction score
0
A very simple question, but needs to know proper explanation. Why the neutron scattering from hydrogen is negative while deuterium and almost all other atom has positive scattering?
 
Physics news on Phys.org
What quantity are you saying is positive or negative?
 
I don't even know what "negative scattering" could possibly mean. I think you may have a language issue.
 
He means negative scattering length. According to http://mightylib.mit.edu/Course%20Materials/22.101/Fall%202004/Notes/Part3.pdf the spin-spin part of the interaction is stronger than the S-wave interaction for np scattering. Presumably this leads to the phase shift, though the reference only describes the calculation of the cross section.
 
Last edited by a moderator:

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

I Understanding Coherent Neutron Scattering in Hydrogen Molecules
Replies
7
Views
2K
I Questions about neutron interactions
Replies
20
Views
3K
A Energy needed to convert a bound proton to a neutron?
Replies
1
Views
2K
B Can a hydrogen atom become a neutron?
Replies
5
Views
3K
I Why Doesn't Proton Decoupling Affect Hydrogen and Helium Formation?
Replies
3
Views
2K
I Negative Q-value for 7Li(alpha,n) reaction
Replies
18
Views
4K
B What Are the Key Safety Concerns When Building a Fusor for Nuclear Fusion?
Replies
1
Views
2K
A Thomson - Rayleigh Scattering: Rotational & Vibrational Energy Levels
Replies
12
Views
2K
I Can proton/neutron decay be avoided in some conditions?
Replies
3
Views
3K
B Gamma spectroscopy, Compton edge
Replies
21
Views
4K

Hot Threads

Recent Insights

Back
Top