# What is Nucleus: Definition and 415 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. ### I Electrostatic force exerted on an electron inside a nucleus

This is SAMPLE PROBLEM 25-7 from "Physics" by Resnik, Halliday, and Krane, in the chapter "Electric Field and Coulomb's Law". After describing the behavior of uniformly charged spherical shells: follows a sample problem: The solution to (a) goes to say that the volume inside R/2 is 1/8 of the...
2. ### B The Mystery of Excited Electrons: Are They Moving Away from the Nucleus?

when an electron is excited to the conduction band is it move further from the nucleus? Are free electrons in the conduction band further from valence electrons? I saw this picture that seems problematic to me. what do you think?
3. ### Electric field at surface of lead-208 nucleus

For this problem, The solution is, However why is ## r = (208)^{1/3}(1.20 \times 10^{-15} m)## Many thanks!
4. ### I Movement of protons between orbital bands in the nucleus

What would happen if the protons started to have orbital movements with energy gain and loss, changing orbital bands, at the same time as the electrons?
5. ### What causes the radioactive decay of an unstable nucleus?

A philosopher whose work I'm using in a paper uses a radium atom's decay as an example of a "spontaneous power," or an uncaused event. My professor, though, says "quantum fluctuations" cause radioactive decay. What are these fluctuations, and do we know what causes them? It's a college paper, so...
6. ### Nuclear shell model of double magic nucleus 132Sn

The independent particle energies for protons and neutrons around the exotic doubly magic core 132Sn are shown in the figure below, where π refers to protons and ν to neutrons. Using the nuclear shell model and using this figure as a guide, answer to the following questions: a)Estimate Jπ...
7. ### I Separation of Plasma into positive nucleus and negative electrons

Im wondering if plasma is possible to be separated into a positive nucleus and negative electrons and contained within a magnetic bottle ? If possible, what is the most efficient method of achieving it ?
8. ### The density of a proton (hydrogen nucleus)

First of all i want is to check if my answer is right or not because i am really not sure about my answer. Because the length is given in the form of a diameter we will divide that by 2 so we get it in the form of radius, 2.4fm / 2 = 1.2fm = r Then we will convert the radius from "fm" to "m" so...
9. ### Probability of electron in hydrogen nucleus for 1s and 2s wave-functions

For this problem, Is it as simple as using the probability density function, P = Ψ2 and plugging in the radius value given to me? So essentially I am just squaring the wave function and plugging in?
10. ### B Is it the nucleus or a proton at the center?

Which one is closer to reality, is it this picture https://en.wikipedia.org/wiki/Hydrogen#/media/File:Hydrogen_atom.svg or this https://www.naturphilosophie.co.uk/heart-hydrogen-atom/? The reason why I asked the question is according to the picture of hydrogen atom at Wikipedia, which is the...
11. ### I Shooting an electron past a positive nucleus (trajectory)

An electron is shot horizontally. There is a proton located somewhere else, but not in the horizontal path of the electron. Is there a distance of closest approach, and how do you derive it? A physical explanation would be appreciated too.
12. ### I Do nucleons have a lower energy state when bound in a nucleus?

But when I look at the definition of binding energy that doesn't make seem to make sense. It looks as though they had more energy when they were together and when they were separated that energy turned to mass (the mass defect)? Am I looking at this right? I also don't understand this...
13. ### Engineering I can't understand the question -- Calculate the E-field in the electron cloud around a heavy atom's nucleus

I tried to use the formula for electric field intensity but I feel like something is missing.
14. ### Binding energy per nucleon of the nucleus

How exactly would it then be calculated? Here's what I have tried: proton mass: 1.007276 amu Neutron mass: 1.008665 amu Sulphur-34 mass: 33.9678668 amu Calculation: 1.##(16\cdot1.007276)+(18\cdot1.008665)+(16 \cdot0.000549)=34.28117## 2.##34.28117-33.9678668=0.3133032## 3. 1 atomic mass...
15. ### How to find electromagnetic force between nucleus and electron?

Hello, I'm new here and honestly I'm not a physics student. I'm studying engineering and so, understand little of physics. I am trying to find the bond force of graphene's free electron. That means, the electromagnetic force by which the electron is bound to the nucleus. I can only calculate it...
16. ### Energy transferred to nucleus in pair-production

In most textbooks, the recoil energy of the nucleus is ignored as it absorbs so little energy, and since its main role in the reaction is to absorb some of the photon's momentum without absorbing much energy. I'm tempted to say that the nucleus gets the maximum energy when the kinetic energy of...
17. ### 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...
18. ### A Distribution of protons inside a large nucleus

For medium to large nuclei, common sense suggests that protons should not be uniformly distributed inside the nucleus. Assuming the protons inside the nucleus are mobile (but supposing that it doesn't make sense to consider the nucleus a "conductor", in which case all charge would reside on the...
19. ### Binding Energy of a Nucleus

This is an example from my textbook that I am having trouble understanding. So the binding energy of Beryllium-8 is positive 56.6 MeV, so it means the nuclide is stable, right? My textbook seems to use the reference of positive binding energy as being stable. And so that means alpha decay for...
20. ### B Why does the nucleus become unstable as the number of nucleons increases?

Hi, I'd appreciate it if you could help me with the queries below. Please try to keep it as simple as possible because I have only basic understanding. Source: https://www.nde-ed.org/EducationResources/HighSchool/Radiography/radioactivity.htm Source...
21. ### B Why don't electrons fall into the nucleus?.

The first result to this question in Google gives this: "An electron in an atom spreads out according to its energy. The states with more energy are more spread out. All electron states overlap with the nucleus, so the concept of an electron "falling into" or "entering" the nucleus does not...
22. ### I Can an electron in the 1s orbital be indefinitely far from the nucleus?

Is it possible for an electron in the 1s orbital of an hydrogen atom to be indefinitely far from the nucleus in a given instant? From the Schrodinger equation we can see that the radial probability is NEVER zero, so it would be possible to see an electron in the moon, for example. But if I...
23. ### B Why are protons allowed in the nucleus?

Feynman said in one of his lectures that electrons can't just fall down into the nucleus since the uncertainty principal wouldn't let them have a known position and momentum at the same time. The problem I have with this is that protons seem quite happy in the nucleus. Is my objection fair...
24. ### Understanding How to Scale an Atom's Nucleus

Actually i was solving a basic physics problem that says : an atom has nucleus size 10^-15m and it is scaled upto the tip of pin 10^-5m . tell the size of atom. I saw this ques already solved here but i just can't understand how size of nucleus can be increased,...
25. ### I Nucleus energy levels, neutron energy

From what I read I see that for example a radioactive nucleus is a nucleus in an excited state and when it transitions back to it's stable state (changes from one element to another due to radioactive decay) one of the ways this happens is that the nucleus emits a energetic photon with a...
26. ### B Neutron Decay Outside of a Nucleus Near Absolute Zero

Does neutron decay outside of the nucleus occur faster, slower, or at the same speed when the environment it is in is near absolute zero? Do any external factors affect the speed of a neutron decaying?
27. ### How can I calculate the smallest speed of a proton in a nucleus?

My approach: Assuming non-relativistic velocity: $$p = mv$$ $$mvL = \frac{\bar{h}}{2}$$ $$v = \frac{\bar{h}}{2mL} = \frac{h}{4\pi mL}$$ $$v = (6.626*10^-34) / (4pi * 1.67*10^-27 * 4.3*10^-15)$$ $$v = 7.34*10^6 = .0245c$$ This answer is incorrect. What have I done wrong? --- Edit: My...
28. ### I Why can we not produce a "giant" nucleus?

In Condensed Matter Physics there are "giant" molecules that are macro bodies(e.g crystals).But why in Nuclear Physics we can not produce a "giant" nucleus?
29. ### Rotational energy of a nucleus

Summary: I want to show by using the rotational energy formula that ##E(2^+) = 92 KeV##? But I got ##E(2^+) = 3096KeV##. Below is what I've done. There must be something I am missing. [Moderator's note: Moved from a technical forum and thus no template.]
30. ### 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...
31. ### I Electric dipole moment of the nucleus of an atom

Summary: Why is the electric dipole moment of the nucleus of an atom equal zero? Summary: Why is the electric dipole moment of the nucleus of an atom equal zero? I read about the hyperfine interactions that cause the altering of the energy levels of the nuclues of an atom. Under the...
32. ### The Density of a Nucleus

I have the solution to the problem but I think I found either a typo or steps that were not included. I think I have made sense of the problem but I would like to double check that I'm doing this right. Thanks. ρn = mn/Vn mn ≈ ma Rn = 10-5Ra This is were I am having issue. The solution says...
33. ### Momentum transfer between d-electrons and the nucleus in ferromagnetism?

If a copper wire is wound around a piece of iron, nickel or cobalt, and a voltage is applied to the wire, it takes a longer amount of time for the current to reach its maximum value, than if the iron were replaced with a different material, such as glass— a phenomenon known as inductance. My...
34. ### The volume of the nucleus to the volume of the electron

i'am trying to find the ratio between the volume of the nucleus for the hydrogen atom to its electron , but when i try to use the previous equations it seems wrong as i'am getting a low number like if the electron is bigger . i used the the classical electron radius as it was the only thing that...
35. ### 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...
36. ### 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...
37. ### Calculate the mass defect of a carbon-12 nucleus

My attempt: Proton 1.00728ux6+ Neutron 1.00866ux6=12.09564u 12.09564u-11.9967u=0.09894u E=mc^2 E=0.09894x(3.00x10^8ms-^1)^2
38. ### 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?
39. ### I Neutrons inside a nucleus

Hello! Why can't we have as many neutrons as we want inside a nucleus? I understand that for protons you have the Coulomb repulsion, but what leads to an increase of energy when adding more neutrons (which in turns lead to beta decay or fission)?
40. ### What happens/takes place in the molybdenum nucleus

This is not so much of a problem as I'm just interested If anyone knows what happens. It does relate to my homework problem tho because I had to write what Molybdenium decays into from beta which is Molybdenum-99/42Technetium-99m/43
41. ### Binding energy and excited nucleus question

this is from a website on why gamma rays are released what i don't understand is, why is the mass defect lead to a gamma radiation to be formed. If the nucleus is excited and dexcites the change in energy levels would cause a photon to be released. yet here it says the mass defect is the source...
42. ### Electron's Nucleus

Hi does an electron by itself have a nucleus?
43. ### 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...
44. ### 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...
45. ### B Electron scattering off of a nucleus

If I'm scattering electrons off of an atomic nucleus, can I infer any information about the duration of time the electron was accelerating by looking at the wavelength of the emitted bremsstrahlung radiation? I am wondering if it would be possible to derive a time interval between electron...
46. ### Probability of decay of a nucleus

Homework Statement I want to know why probability disintegration per second of a radioactive nucleus does not depend on time lived by it. Homework Equations N/N(initial)=e^(-λt) The Attempt at a Solution According to the above equation, the probability should increase with the passage of...
47. ### 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...
48. ### How is the motion of an electron around nucleus?

How electron revolves around orbitals? Is the velocity uniform or accelerated?
49. ### When the nucleus of H atom is neutral?

The nucleus of the H atom is neutral when it has two electrons and one proton (when forming a covalent bond) or it has one electron and one proton.
50. ### 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...