What is Absorbtion: Definition and 59 Discussions

Neutron capture is a nuclear reaction in which an atomic nucleus and one or more neutrons collide and merge to form a heavier nucleus. Since neutrons have no electric charge, they can enter a nucleus more easily than positively charged protons, which are repelled electrostatically.Neutron capture plays a significant role in the cosmic nucleosynthesis of heavy elements. In stars it can proceed in two ways: as a rapid process (r-process) or a slow process (s-process). Nuclei of masses greater than 56 cannot be formed by thermonuclear reactions (i.e., by nuclear fusion) but can be formed by neutron capture.
Neutron capture on protons yields a line at 2.223 MeV predicted and commonly observed in solar flares.

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  1. A

    Absorbtion and Emission of Photons

    I'm somewhat confused about the emission of photons when electrons go down an energy level. What sentence could I use to help me comprehend this process? This is what I was thinking: When electrons absorb photons from electromagnetic radiation, the electrons have more energy and thus it moves to...
  2. A

    Question about energy and absorbtion

    ((I don't really know where to post this)) What exactly would it take for a human to absorb energy from another human or anything for that matter, and use it. I don't think it is probable, I just wan't to know what it would take. A few questions I have: 1.) If it could happen in...
  3. A

    Question about energy and absorbtion

    ((I don't really know where to post this)) What exactly would it take for a human to absorb energy from another human or anything for that matter, and use it. I don't think it is probable, I just wan't to know what it would take. A few questions I have: 1.) If it could happen in...
  4. N

    Thermal Physics - Absorbtion of oxygen in a magnetic field

    Question: Suppose that at most one O_2 can be bound to a heme group (see Problem 8), and that when \lambda(O_2) = 10^{-5} we have 90 percent of hemes occupied by O_2. Consider O_2 as having a spin of 1 and a magnetic moment of 1 \mu_B. How strong a magnetic field is needed to change the...
  5. F

    What is the equation for light intensity decrease through glass?

    Any help here would be appreciated so much.. Is there an equation that links distance of glass traveled through to light intensity on the other side? Obviously, the light intensity will decrease as the light travels through greater amounts of glass, but is there an trend I am looking for...
  6. S

    Absorbtion Spectrum: Atom Sublevels & Compounds

    Hello, Am I correct in thinking that the sublevels of an atom dictate its absorbtion spectrum? Also why is that a compound can absorb the same spectrum at every point, rather than individual atoms absorbing their respective spectrums? Thanks, -Scott
  7. S

    Photon/Electron absorbtion in atoms

    Hi guys, I have this question I can do the first part but not the second, any help would be appreciated. Thanks in advance! :cool: o:) --------------------------------------------------------------------------- http://img381.imageshack.us/img381/6778/ocau9rj.th.jpg Question 1 A photon...
  8. matthyaouw

    Alcohol absorbtion through skin.

    Ok, I'm drinking a whisky (a rather fine Islay blend too) and I'm increasingly noticing that the feeling in my upper lip is vanishing where the drink passes over it. I can only assume that I'm directly absorbing the alcohol through my skin, and the neurones in there are blind drunk. Am I right...
  9. M

    How does density affect wave absorption in substances?

    Hi, Is there an equation or a formula or ratio or something similar that relates the density of an object to how much it absorbs energy from the wave moving through it? Thanks MarkySims
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