Read about nuclear physics | 101 Discussions | Page 1

  1. B

    Nuclear physics - solar neutrinos interacting

    For the first part I thought you'd have either, p + anti-v -> n + e+ and n + v -> p + e-, but I thought it'd probably be the latter as it's a 'normal' neutrino not an anti neutrino? But do I need to include the actual elements in the equation? For the second part I have multiplied the density...
  2. A

    Forbidden beta decay form factors

    My idea was to consider first the structure of the matrix element and to see if there are any possible constraints that we could use for parametrization. If I am not mistaken, we are dealing with the hadronic decay governed by QCD which conserves parity. Since we have a derivative operator...
  3. S

    Applying least squares to measurement of nuclei masses and Q-value

    Consider the problem in the attached image. The difference between A and B is 0.0020(20). How does one use the least squares method, particularly in matrix form, to find the best value of the masses of A and B respectively, as well as the Q-value? Aren't more measurements needed for the masses...
  4. Adams2020

    What is the recoil energy of a nucleus produced in its first energy level?

    Table: To solve, using the conservation of energy: E0=(m(deutron)+m(16O)-m(17O)-m(p))c^2 so: E0=(2.014+15.994-16.999-1.008)931.5=0.93 MeV. so using the conservation of energy: 14.95+0.93=16.62+0+E' E'=- 0.74 MeV But the energy sign has become negative. I also calculated for the first excited...
  5. Adams2020

    I The surface area of an oblate ellipsoid

    In "An Introduction to Nuclear Physics by W. N. Cottingham, D. A. Greenwood" for the surface area of an oblate ellipsoid, the following equation is written for small values of ε : The book has said this without proof. I found the following formula for the desired shape: No matter how hard I...
  6. Adams2020

    Mass difference due to electrical potential energy

    I do not really know the relationship between potential energy and mass difference. Isn't the difference in mass of protons and neutrons due to their quarks? (the neutron is made of two down quarks and an up quark and the proton of two up quarks and a down quark.) Please help.
  7. Stephen Bulking

    I Units of amu

    I was finding the energy required to separate tritium into it's component parts, the binding energy when it hit me that how could 1amu= 931.2 MeV and 1.66e-27 kg at the same time?
  8. P

    I Necessity of Quantum Gravity given Planck scales for nuclear physics

    In the solutions (page 6, points ii) and iii)), https://ocw.mit.edu/courses/physics/8-04-quantum-physics-i-spring-2013/assignments/MIT8_04S13_ps1_sol.pdf, it is mentioned that given that the Planck mass is about 20 orders of magnitude larger than a proton and that the Planck length is about 20...
  9. A

    A Energy needed to convert a bound proton to a neutron?

    Hey everyone, I've got a question on converting bound protons into neutrons. a. What are some methods used to achieve the proton-to-neutron conversion in atomic nuclei? I'm familiar with particle scattering off a proton in the nucleus. I'm also aware of (n,p) reactions. Are there any other...
  10. Rifat amin

    Software for nuclear cross-section measurement and Irradiation yield

    I work in research paper on medical isotope production. I need a software where i can measure the cross section and Irradiation Yield like TALYS and EMPIRE. If you ask me why i don't use TALYS then the reply is I can't install it on my PC. so i am looking for alternate software where i can do...
  11. A

    A "Reversal" of Nuclear Decay in Beta Emitters

    Hello all, I've got a question on nuclear decay "reversal" in beta emitters. I've been researching the Cowan-Reines experiment, which used neutrinos to convert protons into neutrons. Recently, I found out that the particle which hits the proton need not necessarily be a neutrino in order to...
  12. E

    Balance these nuclear equations

    I was thinking that these reactions have something to do with the conservation of leptons but I am not certain.
  13. patric44

    The Q factor of the nuclear reaction problem?

    after using the conservation of energy and momentum for a nuclear interaction i arrived to the following equation for the q factor as the book did , but cant get my head around deriving the second equation from the Q equation ? i will appreciate any help . thanks
  14. JD_PM

    Finding a method to compute the magnetic moment of an even-odd nucleus

    I am having difficulties computing the magnetic moment for an even-odd (proton-neutron) nucleus. The formula is: $$\mu_J=g_J\times j\times \mu_N$$ I checked this helpful post...
  15. JD_PM

    I Angular momentum of an Odd-Odd nucleus (in its ground state)

    What I know is the following: The total angular momentum of the nucleus is just the total sum of the angular momentum of each nucleon. If the nucleons are even the total angular momentum in the ground state will simply be ##0+##. If the odd number of nucleons is close to one of the magic...
  16. J

    Possible spins and parities of an odd-odd nucleus

    I'm actually not even 100% sure about the formulas, as in my book they explain j, s and l quite unclearly. Could anyone give me a proper explanation as how to see these and if i'm using them correctly. What i tried to do was determine the proton and neutron angular momentum, spin and parity...
  17. 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?
  18. C

    Nuclear Reaction - How to determine variables as much as possible

    Hey Guys, exercise: "It is desired to study the first excited state of 16O which is at energy of 6.049 MeV. Using the (alpha, n) reaction on target of 13C, what is the minimum energy of incident alphas which will populate the excited state? So, i suggest to define first the reaction equation...
  19. D

    I Can any element be photodisintegrated

    Can any element be photodisintegrated or are there certain elements that can't be photodisintegrated?
  20. D

    241Cm alpha decay to 237Pu

    I understand that In general, the branching ratio for a particular decay mode is defined as the ratio of the number of atoms decaying by that decay mode to the number decaying in total. But I can’t get this specific branching ratio.
  21. JD_PM

    Nucleon-nucleon scattering; why can we assume ##l=0##?

    I have found the following explanation: Isn't ##l \hbar = mvR## (semi-classical argument) wrong? I'd state ##mvR = \sqrt{l(l+1)} \hbar## instead. Text is coming from Introduction to Nuclear Physics; Krane, pages 87 and 88.
  22. DHO232

    I Does a photon experience time while interacting with the weak force?

    Long time reader, first time posting here in physics forums. I know that according to relativity photons have no proper time. I also know that a photon of sufficient energy can interact with a nucleus's nuclear force via the weak interaction resulting in pair production. I was looking at a...
  23. JD_PM

    A Spin-eigenstates of Deuterium

    I am studying the deuterium's nucleus. As we know, there are just two eigenstates for a spin 1/2 particle: either spin up or spin down. Thus, over the whole nucleus, you get 4 possible combinations: 1) Spin up-spin up 2) Spin up-spin down 3) Spin down-spin up 4) Spin down-spin down If you...
  24. JD_PM

    Nuclear An "Introduction to Nuclear Physics" book

    Hi, I am wondering what's the best (or one of the best) available books on Introduction to Nuclear Physics. I started reading Krane's, which is a good book. However I am looking for more options. I am most interested in books which give a deep insight into physics concepts without lacking of...
  25. JD_PM

    A How to explain the nuclear radius of Uranium 238 using QM

    I am studying how to determine the nuclear charge radius from direct measurement of the Coulomb energy differences of nuclei. My book says that there is strong evidence which suggests that the nuclear force does not distinguish between protons and neutrons. Thus changing a proton into a...
  26. JD_PM

    I Nuclear physics exercises translation from Dutch to English

    Google translator does not really help me translating these exercises. May you help me out? If this is not the site I should I ask for translation of physics texts, may you tell me where should I ask for that?
  27. A

    A Influence on Neutron spectrum due to energy loss of beam

    Suppose some protons are impacted on a Lithium target to produce neutrons with energies close to the proton energy. If one considers Energy-loss due to proton-target collision (ionization of the target atoms), will this kind of energy loss influence neutron energy spectrum? I am asked by my...
  28. A

    What’s the relation between activity and half-life

    I’m confused because there are two equations: 1) A=λN 2) A=A0exp^-(λt) If half-life increases, λ decreases, and A decreases according to 1); but, If half life increases, λ decreases, hence exp^-(λt) decreases, A should decreases according to 2) Why is this so? Where went wrong? Thanks!
  29. S

    I Am I understanding the Geiger-Nuttall law correctly

    Geiger–Nuttall rule relates the decay constant of a radioactive isotope with the energy of the alpha particles emitted. Roughly speaking, it states that short-lived isotopes emit more energetic alpha particles than long-lived ones. - wiki I am trying to understand why there is an inverse...
  30. S

    Calculate velocity of the fastest neutron inside a 96Mo nucl

    Homework Statement Calculate the velocity of the fastest neutron in a 96Mo nucleus and, based on this, explain whether or not we are safe to consider such nucleons in a non-relativistic way. Hint: first calculate the Fermi energy. Homework Equations Fermi energy from Fermi gas model...
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