What is Nucleus: Definition and 420 Discussions

nuCLEus is a proposed mixed-used development complex planned for the Gateway District of downtown Cleveland, Ohio, United States. The project won unanimous approval from the Cleveland Planning Commission in November 2014, and recently received schematic design approval from the City of Cleveland in March 2019 after a thoughtful redesign to fit the city's growing population and needs in downtown Cleveland.Robert L. Stark of Cleveland-based Stark Enterprises is the lead developer on the nuCLEus.
The $300M mixed-use project will encompass approximately two million square feet in the heart of the city at the intersection between East Fourth Street, Prospect Avenue and Huron Road, connecting many of the venues in the Central Business District.
nuCLEus will serve as a mixed-use, vertically integrated space with a mix of Class A office space, retail, restaurants and residential living divided between two distinct, 24 floor towers.

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  1. M

    Primordial Black Hole as nucleus for gravitic atom

    I'd like to consider a primordial black hole in the absence of Hawking radiation. When you consider the case of a primordial black hole with a Schwarzschild radius on the same order as the radius of a proton, I calculate its mass to be at around 6.75x10^11 Kg. If I then calculate the...
  2. D

    Decay Method and Time of Nucleus

    Hi, I have a question regarding the types of decay and the time of decay for an atomic nucleus. Do all nuclei have a set decay time and method, (by method I mean Alpha, Beta, Gamma decay). i.e. does Uranium only decay via beta decay over a set time? Or can an nucleus decay by any of the...
  3. D

    Comparison of Mass-Energy: Electron Cloud vs. Nucleus in Ground State Atoms

    Hi, I had a previous post "Total Energies" asking about the total energy of an electron and proton separately in a "stable," ground state, hydrogen atom and I got no response (well one short one). Later I realized an isolated hydrogen atom is not stable; it at least needs to bond into H2, but...
  4. P

    Why don't electrons stick to the protons in a nucleus?

    Positive electrical charges attract negative electrical charges. The protons in nucleuses (or nucleii? if that's how it's spelled) have positive electrical charges. Electrons have negative electrical charges. So why don't electrons stick to the protons in a nucleus instead of orbitting...
  5. G

    Excitation levels (gamma ray spectrum) of a single proton nucleus

    where can I get information about the excitation levels (gamma ray spectrum) of a single proton nucleus?
  6. M

    Ground state energy of nucleus

    How do we compute the energy of the ground state using nuclear shell model?
  7. Q

    Nucleus stability: Neutron & Proton Ratio

    Hi I'm looking for a good description (high-school to 1st year level) why the ratio of protons to neutrons matters for stability. Single neutrons are unstable, but in a nucleus they are stable and the more nucleons you have the greater the strong force. So why can't you have stable isotopes...
  8. TrickyDicky

    Is the Proton Always Confined at the Core of an Atom?

    I have next to zero knowledge about nuclear physics but after giving some thought to the dynamics of the electron cloud in the atom and its kinetic energy I realized that the motion of the nucleons in the atom is not so frequently discussed and I was wondering ,for instance, in the case of the...
  9. T

    Calculating Speed to Reach 1.11 fm from Oxygen Nucleus

    Homework Statement The oxygen nucleus 16O has a radius of 2.91 fm. With what speed must a proton be fired toward an oxygen nucleus to have a turning point 1.11 fm from the surface? Homework Equations Kinetic energy = 1/2 mv^2 Potential energy = 1/4(pi)Enot * q/radius min The...
  10. S

    Why is there no odd-even staggering for electronic binding energies?

    hi, I am wondering why even numbers of protons, or neutrons, or electrons, are more stable that odd numbers? i have read this on wikipedia: http://en.wikipedia.org/wiki/Oddo-Harkins_rule " In elements with even atomic numbers, protons are paired, with each member of the pair...
  11. L

    Electrons not inside the nucleus?

    an unstable neutron decays to electron, proton and anti neutrino. if that being the case, why electrons are not inside the nucleus?
  12. L

    Do electrons stay in orbit around the nucleus in the same way

    We stay in orbit around the sun? Our own planet's kinetic energy keeps it from succumbing to the Sun's gravity, same concept with the electrons, this time Gravity being electromagnetic force right? Edit: Damnit, wrong section...
  13. C

    Is it Possible for Nuclei to Emit Visible Photons?

    Can a nucleus in an atom emit visible light . I am aware that the nucleus has discrete energy levels, And it seems that they only emit gamma rays, but could we make them emit visible photons. I have just begun to study very basic nuclear physics in my classes. And i am taking EM theory...
  14. J

    Electrons bound to the nucleus/ Bohr hypothosis

    Question: If we assume that an electron is bound to the nucleus (assume a H atom) in a circular orbit, then the Coulomb force is equal to the centripetal force: mv^2/r= ke^2/r^2 In the Bohr hypothesis, angular momentum, L = mvr is...
  15. L

    Exploring Electron Energy and Distance from Nucleus

    Why do electrons have more energy the further they are from the nucleus?
  16. A

    How Is the Minimal Distance Between a Proton and a Nucleus Determined?

    Homework Statement A proton is fired at a nucleus containing Z protons and N neutrons, with a kinetic energy K. Show that the minimal distance r_0 = [(Ze^2) / 4pi*epsilon_0] * (1/K) Homework Equations E=(q/4pi*epsilon_0) * (r-r' / |r-r'|^3) The Attempt at a Solution I know that at...
  17. Z

    The space between an atom's nucleus and it's electrons

    Earlier today I was thinking about what is in between the very few molecules of hydrogen floating around in interstellar space (dark matter?), and a question came to me. What is in the space between the nucleus of an atom and the electrons that surround that nucleus? The space would be too...
  18. R

    Exploring the Spherical Shape of the Nucleus: A Scientific Inquiry

    Why nucleus is spherical in shape in its stable state?
  19. alemsalem

    Energy levels of the HE4 nucleus

    what i mean is could it be possible for an alpha particle to acquire energy (by collision or from emission) and subsequently emit a gamma ray?? or does only have one (ground) state??
  20. A

    Wave solution of nucleus alongwith that of electrons required

    While solving the Schrodinger equation for Hydrogen atom, we use the reduced mass and get the wave functions of the electron. I like to get the wave functions of the nucleus as well as that of the electron. This may probably need to avoid using the reduced mass concept. Is this problem...
  21. R

    Lifetime of a decaying nucleus changes with temperature?

    hello, does the mean lifetime of a decaying nucleus changes with temperature? I generally think that mean lifetime of a given nucleus doesn't change with temperature. thanks for your valuable input.
  22. P

    Understanding Fission Reactions: Calculating Energy & Mass in Joules and MeV

    How do we determine the values of any given fission reaction? How do we answer questions like: A decrease in mass of 3.48x10(to the power of -28) kg occurs. Express the energy equivalent of this in terms of joules and MeV. I keep reading and reading but can't understand. I search online...
  23. D

    Nucleus Ratio of nucleons between surface and core

    Homework Statement We suppose the nucleon density of a spherical nucleus where r<R1 is constant, and where R1<r<R2 the density linearly decreases to 0 at R2. We call the surface nucleons (Number Ns) the number of nucleons contained in the volume R1<r<R2 and core nucleons (Nc) the number...
  24. K

    Formation of 17O Nucleus from 14N + Alpha Particle

    Homework Statement An alpha particle is bombarded on 14 N. As a result a 17 O nucleus is formed, and a particle is emitted. This particle is a: (a) neutron (b) proton...
  25. G

    Calculating the Minimum Proton Speed Near a Lead Nucleus

    1. Predict the minumum speed of a 20.0MeV proton as it passes within 1.0x10^-13 meters of a lead nucleus having 82 protons. (Note: 1eV = 1.6x10^-19 Joules) 2. How do I start off? 3. All i can think of is to get a charge for the lead nucleus by using q=ne which is the number of...
  26. L

    Calculations Involving Binding Energy of Nucleus

    Homework Statement The binding energy of a nucleus is given by: E_{b}=a_{1}A-a_{2}A^{\frac{2}{3}}-a_{3}Z^{2}A^{-\frac{1}{3}}-a_{4}\left(Z-\frac{A}{2}\right)^{2}A^{-1}\pm a_{5}A^{-\frac{1}{2}} For a given set of isobars, A constant, E_{b} will be maximised at the value of Z that satisfies...
  27. L

    Calculating Properties of Nucleus

    Homework Statement 1. Write down an approximate expression for the mass of a nucleus in terms of mass number A and nucleon mass m_{n} 2. Assuming that the nucleus is spherical, find an expression for the volume of this nucleus in terms of A and r_{0} 3. Find a numerical value for the...
  28. L

    Distance of alpha particle to gold nucleus

    1. The predictions of Rutherford's scattering formula failed to correspond with experimental data when the energy of the incoming alpha particles exceeded 32MeV. This can be explained by the fact that the predictions of the formula apply when the only force involved is the electromagnetic force...
  29. Y

    Question about size of nucleus.

    if anybody tell me is the of hydrogen and carbons nucleus is same or not.please explane it deaply
  30. S

    Is the space between the electron shell and nucleus a perfect vacuum?

    Is the space between the electron shell and nucleus a perfect vacuum?
  31. N

    What determines shape of dust nucleus?

    Is a dust nucleus, dust attached to air? If water vapor molecules, attach themselves to dust nucleus in building visible [to the eye] snowflake, I'm supposing flake takes on shape of the dust. Does this mean "air" is shaped too? Don't laugh; I'm most confused!
  32. A

    Neutron collides elastically with a helium nucleus

    "neutron collides elastically with a helium nucleus" Homework Statement A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 40° from the neutron's initial...
  33. 0

    At what distance from a carbon nucleus is the electric potential 2.1 V?

    Homework Statement At what distance from a carbon nucleus is the electric potential 2.1 V? Carbon atoms have 6 electrons in the atomic shell. Homework Equations v= K Q / r^2 OR K Q / r (NOT SURE) The Attempt at a Solution use voltage potential for point charge Using either v= K Q / r^2...
  34. J

    Accounting for moving nucleus in Bohr theory

  35. A

    Hydrogen atom vs hydrogen nucleus.

    Homework Statement A hydrogen atom has a diameter of approximately 1.06x10^-10 m, as defined by the diameter of the spherical electron cloud around the nucleus. The hydrogen nucleus has a diameter of approximately 2.40x10^-15 m. (a) For a scale model, represent the diameter of the hydrogen...
  36. K

    Difference between nucleus and nuclide

    1. Homework Statement What is the different between nucleus and nuclide? Homework Equations N/A The Attempt at a Solution Initially, i think that they mean the same things but now i know it isn't so i am seeking for answer
  37. L

    The forces in an atomic nucleus

    In an atomic nucleus, there is protons, and neutrons. The protons are positively charged and the repel each other. However, there is an "opposing" that helps to keep the nucleus in a piece instead of breaking apart. Does anyone know what kind of force is this? And what causes this force to be...
  38. J

    A couple of questions about the spin of a nucleus?

    Hi, I have a couple of questions about the spin of an atomic nucleus. Say I had a carbon-12 nucleus, which is 6 protons and 6 neutrons. The Pauli exclusion principle tells us that these should be arranged in shells determined by their orbital angular momenta and spins. So, the shell...
  39. E

    Binding energy calculation of a nucleus

    Hello, I'd appreciate feedback on my calculation of binding energy, just wanted to check if I'm on the right track w/ regards to calculation steps (and thought process). I'll try to be as clear as possible, please give me input if there's some notations / steps I should correct and keep...
  40. N

    Is an atom's nucleus a single particle?

    Is an atom's nucleus a single particle? Take for example the nucleus of a lithium atom which contains three protons and three neutrons. Do the wavefunctions of these three protons and three neutrons merge together to form a single particle, in the case of the lithium's nucleus, a...
  41. T

    Force between particles in nucleus

    Homework Statement The nucleus of a zinc atom has 30 protons and 35 neutrons, and a diameter of 4.00 x 10^-13 m. What is the minimum repulsive electrostatic force between two protons in the nucleus. Homework Equations The Attempt at a Solution Not sure how to approach this. I...
  42. N

    Elastic Collision between a neutron and helium nucleus.

    Homework Statement A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 41° from the neutron's initial direction. The neutron's initial speed is 6.2 x10^5 m/s...
  43. D

    Stress-Strain of Alloy with 100μm Nucleus Size

    as depicted in the diagram below the stress strain for an alloy with an average nucleus size of 100 micron find 1)the modulus of elasticity for the alloy 2) the yielding stress for 1) i assume that the red line is meant to be at 0.0005 therefore E=dσ/dε=100e6/0.0005 E=200Gpa...
  44. J

    Electric quadrupole moment and nucleus shap

    The nuclear electric quadrupole moment is a parameter which describes the effective shape of the ellipsoid of nuclear charge distribution. A non-zero quadrupole moment Q indicates that the charge distribution is not spherically symmetric. By convention, the value of Q is taken to be positive if...
  45. Q

    Recoil speed of an atomic nucleus

    Homework Statement An atomic nucleus is in an excited state. It decays to its ground state with the emission of a gamma ray having energy, Egamma = 24.0 keV. The nucleus has a mass of 9.53e-26 kg. What is the recoil speed of the nucleus? (Note: This may be an inelastic collision)Homework...
  46. A

    Electrons entering the area Atom's nucleus

    A while back I recall reading an article regarding artificially forcing electron particle waves into the surrounding nucleus of an Atom and that the result would shrink the size of the atom. Can an Atom hold more than the normal amount of electrons, if so is there a maximum?
  47. K

    What Is an Isoscalar Nucleus?

    What is an isoscalar nucleus? I guess it should be a nucleus with isospin T=0. In the place where I encountered it, it seems to refer to a nucleus with equal number of neutrons and protons. An isoscalar target should necessarily have equal number of neutrons and protons. But as far as I...
  48. B

    Atomic Nucleus: How Does It Get Energy?

    How does the nucleas of an atom get energy?
  49. J

    Calculating avg distance from nucleus

    Homework Statement Calculate the avg. distance from the Hydrogen nucleus for an electron in 2p. Homework Equations <r> = int[r^3 |R|^2]dr from 0->infinity For Hydrogen 2p, R = (1/a)^3/2 (1/(2*sqrt(sigma))*sigma*exp(-sigma/2) where sigma = r/a The Attempt at a Solution I get 1/4a^4 (24...
  50. matt_crouch

    How to calculate the density of an iron nucleus

    Homework Statement An iron nucleus has a radius of 5.4x10^-15 and a mass of 9.3x10^-26 what is its mass per unit volume in kg/m^3 Homework Equations Area of a sphere = 4/3(pi)r^3 Density= M/V The Attempt at a Solution i basically plugged everything into the equations so...
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