Nuclear fission Definition and 88 Threads

Stars have mass. This mass has a gravitational pull. The nuclear fission of the star pushes against the effects of gravity. Why doesn't the gravity reduce as the star burns more and more of the hydrogen/helium/carbon that it's made up of? In other words, how can a black hole be created when the...

I'm working on a Python-based project to simulate fission energy containment. Details and GitHub link for collaboration coming soon. Looking forward to contributions.

How did you find PF?: Searched for some forum about mechanical engineering in Google Do pulsed nuclear fission reactors have any chances to be used in nuclear power? If the answer is "no" is that just because of no need in pulsed operation mode while having a common one, are there any more...

(112 x 8.36 + 122 x 8.51) - 235 x 7.59 = 190.89 MeV My question is what should I do about the incoming neutron on the left that starts the fission. My thinking is that it does not have any binding energy and therefore I left it out of the calculation. Is that correct? Thank you

I'm learning about nuclear fission for fun, well based on my research, 82% of the time that uranium-235 absorbs a neutron it will fission, the uranium-235 will briefly turn into an excited uranium-236 and after that, it will split, the other 18% of the time it will just emit radiation and...

If I am not mistaken, binding energy is the energy required to separate the constituents of the nucleus, and is always a positive number. However, if splitting elementary particles in the nucleus apart requires energy, then why do fission reactions release energy?

How do I create a nuclear fission reactor? if you can link me up to any places to buy the things or any other sites that would be good.

Just joined the forum after youtubes algorithm suggested a story documenting the ‘Chicago Pile’. I ended up watching a bunch of other power plant videos becoming more confused with each one. I apologize up front as I know nothing about the field of nuclear physics and not even sure if I’ll even...

This week I read through the chapter "Energy from the Nucleus" inside the familiar intro physics textbook Halliday, Resnick, Walker. I found it fascinating that there is evidence from a uranium mine in West Africa that there may likely have been a nuclear fission natural reactor that went...

The nuclear fission reaction is: ##U_{92}^{235} + n^{1}_{0} \to Ba_{56}^{141} +Kr_{36}^{92} + 3 ~n^{1}_{0} ## I am not sure about the number of neutrons produced. Is it 2 or 3? 2 is from the number of neutrons on the RHS - number of neutron on LHS 3 is from the number of neutrons on RHS only...

Summary:: Calculate the amount of energy in joules generated from 2 kg of uranium fuel if the uranium 235 represents 0.7% of the metal and every fission releases 200 MeV. Hi! I am stuck in this question from my exercise book : Q. Calculate the amount of energy in joules generated from 2 kg...

Good day everyone, I've recently been researching direct energy conversion schemes for nuclear fission, and I have a question on the basic physics behind the device (specifically on how it converts kinetic energy to electricity). In essence, the "basic" scheme for fission DEC devices is that...

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...

as far as i understand nuclear fission is the splitting of a heavy nucleus cause of a added neutron the energy you get is cause of the lost mass from binding energy. but i also read that the nuclear fission products undergo beta decay which emits beta particles gamma rays and antineutrinos so...

Summary:: How do high-enriched uranium reactors compare with low-enriched uranium reactors? Hello, I'm doing some research for a book, and there's some information about fission reactors I just can't find. I am comparing HEU fission reactors with LEU fission reactors ... even ballpark figures...

Is there any phenomenon in nature that resembles or is analogous to nuclear fission?

There are already 4 generations of nuclear fission reactors. (Compare https://en.wikipedia.org/wiki/Nuclear_reactor#By_generation.) However among these, there does not seem to be a (maximum) safe nuclear fission reactor design, which immediately stops the nuclear chain reaction when the reactor...

Hi all, I struggle to understand how energy is conserved I fission. If the binding energy per nucleon increases, surely the mass defect simply accounts for that difference to conserve energy before and after. How does the mass defect account for the kinetic energy of the fission fragments as well?

The atomic nuclei consist out electrons, protons and neutrons (with only exception of hydrogen, that does have a neutron). Thus, it would be straightforward, that there existed a corresponding radiation for each nucleus component, when a nucleus decays. There is an electron radiation (beta...

In a simple nuclear fission reaction an uranium atom breaks into krypton and barium releasing around 200MeV. Binding energy per nucleon (BE/A) of uranium = 7.6 MeV And binding energy per nucleon of krypton an barium is just larger than that of uranium. So in my view, around 200 MeV is used to...

Hi all , I have a very simple doubt in the basics of radioactivity . Nuclear fission is the splitting of the nucleus of a heavy atom such as U23592 by bombarding with slow neutrons into two lighter nuclei with a simultaneous release of huge amount of energy . Now my doubt is that - Can a...

Hi, I have learned that, in a nuclear fission or an alpha decay, the available energy released is the difference of masses between the initial nuclide (+ eventually some other initial particles) and the output particles, times c^2 (as E = mc^2). I'm fine with that. But I wonder : what about...

http://physics.stackexchange.com/questions/249809/why-only-light-nuclei-are-able-to-undergo-nuclear-fusion-not-heavy-nuclei Can anyone please explain me - what is similar between Nuclear fission & Nuclear fusion? Why are only light nuclei able to undergo nuclear fusion, not heavy nuclei? I am a...

Nuclei of unstable isotopes spontaneously fission in a way that is measured in half-life. So for a particular nucleus at a given time, it is a probability of some amount, thus is a QM fluctuation? Then what is going on in reactors which in effect modify the nucleus half life by introducing extra...

I was watching an explanation (found here: youtu.be/yTkojROg-t8 ) on nuclear fission. In the video, he described the process of fission to happen one a random neutron smashes into a uranium nucleus. This causes the necleus to split into krpyton and barium, taking part of the nucleon and...

How could an element and all its atoms die? With nuclear fusion they combine atoms, so are they also making elements?...is it possible to make an element shooting the right number of p+,n, & e- and then contain it/save it for later?

When neutrons are fired at atoms, if at higher speeds they will behave as waves, wander through and scatter, (which can produce something similar to x-ray diffraction images), but if slowed to the right "thermal energy" speed, they will be captured by (say) U-235, making the U atom unstable...

Its been a long time since I've studdied chemistry, I used to have a pretty decent understanding of it, but I've forgotten some of it. I remember that the energy produced from a fission reaction has to do with the number of bonds being broken, and that bonding energy released is obscenely high...

Homework Statement I've attached the question I'm having trouble with. Homework Equations The Attempt at a Solution I got an answer of 1.70375 * 10^-3 for the binding energy of a nucleus of uranium 235. For the third part, "When a uranium-235 nucleus undergoes fission..." I read the value of...

is it possible to create a bike involving nuclear fission and fusion . by using any nuclear reactant.

According to the experimental curve of Binding Energy per nucleon vs Mass no. , we have come to know that heavier nuclei having less B.E. are fissionable. We have also learned from Neutron vs Proton curve that those nuclei having N/P>1 can show radioactivity. But my question is why not all heavy...

Homework Statement (a) What processes changes atomic number by 1? What are the favourable conditions? How do you tell a neutrino is involved? How can we use this to understand the mass of this particle? (b) Use semi empirical mass formula to explain why odd-odd isobars are unlikely, while...

Hi, I'm currently doing an assignment on nuclear physics. One of the questions in said assignment is asking me to state the decays which usually happen within a nuclear power plant, as well as stating the fission products, explaining what's happening, and showing the equation. One of the sites...

Homework Statement Our instructor asked to find 6 nuclear fission equations related to 235u. I found only 1-2 example. But none of them has shown the steps about fragments to be stable and thermal energy created in that equation. I know it was a mistake. Please help me out. Homework...

How did they arrive at this expression? I understand the ##Q^2## term in the nominator and the ##r = r_0 (A)^{\frac{1}{3}}## term in the denominator. Where did the ##\frac{\alpha}{2}## term come from? Putting in Z=40, A=100 gives ##3.3 \times 10^{14} J##, not ##65 MeV##. The energy term...

So I was reading this article about http://www.wired.com/2013/09/plutonium-238-problem/all/ and it got me thinking about possible substitutes. This is what I came up with. You make thin sheets of beryllium mixed with some kind of alpha particle emitter. You also make thin sheets of some...

A person said: "However uranium-235 (U235) makes up only 0.72% of normal uranium metal and has to be separated from the remainder (mostlyuranium-238) in special factories which makes uranium-235 (U-235) a little more expensive. An uranium-235 (U-235) atomic has three neutrons less than an...

Homework Statement [/B] Suppose the main water pipe breaks in a nuclear power plant, shutting off the water flow. If the control rods fall immediately into place, stopping the chain reaction, is there still a problem? Yes, because radioactivity continues to create lots of thermal energy. (A)...

Homework Statement I have been able to complete all questions apart from part e) Homework Equations Beta minus decay involves electron emission Beta plus decay involves positron emission Electron capture takes in an electronThe Attempt at a Solution I believe that because there is an...

i want this book- can anyone help me? Vandenbosch, R. and J. R. Huizenga. Nuclear Fission, Academic, New York, 1973.

Hi everyone, I'm an engineer and not a physicist, so forgive me if something sounds stupid. Question: Is it possible to know, which way products of nuclear fission (u-235) will go? Imagine a sheet of single (or few) atom layer crystal of U-235, that is irradiated by neutron source from...

I am confused about spontaneous fission. My basic understanding is that like α-decay the tunnel effect is responsible. We have a potential barrier caused by the superposition of surface tension energy and coulomb potential through which an energised nuclear fragment can tunnel with a certain...

Homework Statement Homework Equations The Attempt at a Solution (a) Shown. (b) W = 975 MeV (c) Initially nucleus has volume V. Splits into two smaller particles each with charge Q/2, and volume V/2. So for each particle, Q/2 and R*(1/2)1/3 So, W' ~ 2 *...

In a nuclear fission of the uranium for example, the uranium atom can be subdivided in Kr and Ba + 2 neutrons + energy dissipated. This energy comes from the mass defect of the uranium in relation to Kr+Ba+2 neutrons. Is this energy full released in the form of photons? Is this energy full used...

During nuclear fission a heavy nucleus of low binding energy splits into two middle mass nuclei with high binding energy ! From where does this energy suddenly come from ?? And why is the binding energy of heavy nuclei lesser than that of middle mass nuclei ??

For our last physics and chemistry project at Tully High, we broke the record for the Largest Nuclear Fission Model with mousetraps and ping pong balls! The record can be viewed via the following link

Does it give a lot or is nuclear fission only powerful when you have a large quantity?

Homework Statement not an equation as such. new to this but i wanted to know what the conditions for nuclear fission are? other than high temperatue and pressure Homework Equations "state the conditions for fusion and hence explain why it has proved difficult to maintain a sustainable...

Hi, My textbook says that only Uranium and Plutonium are fissionable but it doesn't say why. Do smaller isotopes become bigger when they are bombarded by neutrons instead of spitting apart? Thanks

Fission type nuclear bombs and nuclear reactors use neutron bombardment to trigger the fission reaction but why not protons? Protons can repel the like electromagnetic fields of the other protons in the atomic nucleus so why not bombard the nucleus with protons instead?