Read about nucleus | 23 Discussions | Page 1

  1. M

    I Nuclear energy levels

    Hi All. For the above energy level diagram, why do the energy levels spacings proceed to get smaller and smaller as the excitation energy increases?
  2. Nathan Warford

    B Nuclear Radius discrepancy

    I have seen numerous sources for radii of atomic nuclii of various elements. One of the most common is the simple equation r=1.2 fm×A⅓, which makes sense if the nuclear density is constant for all elements and all isotopes. However, I've also found a table of measured nuclear charge radii that...
  3. M

    Spin of a nucleus within an external magnetic field.

    When a nucleus is placed inside an external magnetic field, it aligns itself parallel to the field, as that is the most stable position for it to be in. In more technical terms: it acquires an alpha spin. When you shine radio waves at this nucleus, it absorbs energy and flips over anti-parallel...
  4. QuarkDecay

    A Nuclear and Atomic energy levels

    I've noticed that in the Shell Model of the nucleus, the order of the energy levels is 1s, 1p3/2, 1p1/2, etc. While in the atomic energy levels it goes 1S 2S 2P, ... But they still take the same amount of particles for each level in both the atomic and nucleus. Am I missing something here? Or...
  5. S

    I Why are higher magic numbers not accurately predicted?

    Why are higher magic numbers not accurately predicted if nuclear potential is assumed to be a central potential? Nuclei with magic numbers have a higher stability that those without. If we think of the nuclear potential as a central potential though these magic numbers aren't predicted...
  6. S

    I Distribution of nucleons in the nuclei

    What does this diagram tell us about the distribution of nucleons in the nuclei? - The diagram is from Krane Introductory Nuclear Physics I know that nucleons don't congregate around a central part of a nucleus, but instead have a constant distribution throughout. i.e. The number of nucleons...
  7. C

    I Pauli principle and coupling term in Weizsäcker formula

    Consider the pairing term in Weizsäcker formula. Here https://en.wikipedia.org/wiki/Semi-empirical_mass_formula#Pairing_term it is claimed that: I don't understand how Pauli exclusion principle should be the cause of this. This term comes from spin-spin interaction (or "coupling"), but I do...
  8. Kenneth Boon Faker

    B What does the 'space' inside an atom consist of?

    Atoms make up all the material stuff around us, but most of an atom is empty space. The nucleus at the centre of an atom (99.95 percent of its mass) is orbited by tiny electrons (only 0.05 percent or less of the overall atomic mass). And as you've probably heard, an analogy is to think of the...
  9. J

    I Binding energy help

    So we have a nucleus. Lets say its a helium nucleus. If I want to split this nucleus into its constituent nucleons, I must do work against the strong force which is holding it together. Now that I have done the work, the particles are no longer bound. I have done work against the strong force...
  10. K

    B What causes mass defect in the nucleus?

    Hi. I read that the mass of nucleons in nucleus of Oxygen-16 (or nucleus of another atom) is less than the sum of its nucleons if they were separated (also the mass of 8 protons and 8 neutrons). But why does nucleons have less energy in nucleus of atoms than if they were separated? What causes...
  11. weezy

    I A question about a particle's de Broglie wavelength

    For electron scattering experiment which measures charge radius of the nucleus, it's said that energies of scattering electrons (or protons) must be such that their wavelength size is of the same order as nuclear dimensions. While i understand why this must be true I'm not entirely sure. My...
  12. L

    Are pions produced in pairs?

    I thought only strange particles were produced in pairs via the strong interaction, however in my text book it states 'kaons, like pions are produced in pairs via the strong interaction'. Can particles that are not strange also be produced in this way?
  13. Sveral

    I Can resonance be used to split a molecule of CO2?

    Hello, interested, if the posibility of splitting atoms by using resonance is possible, if so, wheather or not I can use it for something else, thanks in advance.
  14. haseeb

    Solving potential of electron inside the nucleus

    Homework Statement I want to derive the following equation. It is the potential energy of an electron inside a nucleus assumed to be a uniformly charged sphere of R. Homework Equations V'(r) =( -Ze2/4∏ε0R)(3/2 - (1/2)(r/R)^2) The Attempt at a Solution I get E = Ze2r/(4∏ε0R3) But I am...
  15. D

    I Limit to the max size of a Nucleus

    Hi Everybody, I've seen that one of the reasons that elements past 137 can't be created is because any element past 137 would require electrons in inner orbitals to go faster than the speed of light, and past 137 they would have to. I have also heard that electrons don't literally orbit the...
  16. Garlic

    A Possibility of a stable mesonic nucleus

    Hello everyone, If a nucleus consisting solely of mesons has enough mesons in it, will it be stable? Mesons are bosons, therefore (unlike baryons) they aren't effected by the pauli exclusion principle, so they all can acquire the lowest energy state. In theory, if there are enough mesons, the...
  17. CrazyNinja

    Nucleus at the center?

    How do we know that the nucleus is at the center of the atom? I know about the Geiger/Marsden experiment and also of its results. They observed a few α-particles scattering almost at 180°. Hence they concluded that there must exist a high density, positively charged "center" in the atom. But on...
  18. ElegantSir

    The Nucleus and Radioactivity

    Homework Statement I have the question with a diagram posted in the thumbnail to make things easier. Homework Equations E = mc² The Attempt at a Solution The homework only had a single example for a question like this so im not 100% sure how to get the answer. So far I've added the 2 masses...
  19. Ryan Reed

    How do quarks determine which quarks to pair with?

    Quarks join up with other quarks to form composite particles like protons and neutrons, but in the center of something like a nucleus, how do they know which quarks are in THEIR proton or neutron? When all the quarks are together and it becomes a "soup" of quarks, why doesn't it form things like...
  20. M

    Nucleus internal dynamics

    The strong interaction keeps the quarks in very stable triplets or due to internal dynamics the quarks are re-arranged in nucleons from time to time?
  21. skepticwulf

    Empty space in atoms vs orbits

    We often read that atoms are mostly empty space. A common example is given as, if the atom was a big as a football stadium the nucleus would be as big as a tennis ball on the center and nearest electrons circling around at far side of seats or something like that. How does this reconcile with...
  22. Ryan Reed

    Are Electron Orbitals Static or Dynamic?

    Do the orbitals of electrons change positions within their energy level relative to the nucleus or are they statically "attached" to the nucleus? To try and put this into perspective, would the orbitals of the electrons be like nailing a balloon(orbital) straight to the ball(nucleus) or nailing...
  23. Ryan Reed

    Do Protons and Neutrons Move around in the Nucleus?

    Protons and Neutrons vibrate in place, but do they change positions within the nucleus? Let's say that there's a helium atom which has two protons and two neutrons. If the particles were set up on the corners of a square for easy representation with a neutron on the top left and top right, and a...
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