Fission Definition and 321 Threads

Hi, a simple question from an amateur: Why does Lithium fission produce energy instead of consuming it? (https://www.world-nuclear.org/information-library/current-and-future-generation/lithium.aspx) I always thought that fission of heavy elements produces energy, and fusion of light elements...

Energy = ##\frac{2000}{235}## x 6.02 x 1023 x 0.7% x 200 x 1 x 106 x 1.6 x 10-19 = 1.15 x 1012 J But the answer is 1.15 x 109 J I am off by a factor of 1000. Where is my mistake? Thanks

Where can I find information about the ~82% of U-235 nuclear fission happening and ~18% not happening?

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?

Main nuclear fuel is U-235. Actinium series to stable Pb-207 includes 7 alpha and 4 beta decays. Total energy yield 46,4 MeV. In the main branch, the 4 beta decays carry around 3 MeV energy. Meaning the alpha decays are about 43 MeV... and they have high biologic effectiveness, around 20...

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.

What are the most important fission products should I include/care about that comes out from the MCNP output?

In this thread, @haruspex presented a very deliberate point about the role of electrons in a nuclear fission reaction (he might have said or meant something else but I will present my version of it). The problem that we have before us can be stated, as candidly as my linguistic faculty of mind...

I am trying to solve part b of this problem. I know the particles are moving at first and are at rest right after fission per the question. Using the relativistic Kinetic Energy equation and the energy between two charges I believe I can solve for r, the radius between the two charges. I am a...

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...

Its unclear to me what exactly these tests entailed and how much today is still top secret. They involved inertial confinement fusion with x-rays from a fission explosion. never see this discussed - forgetting about political issues with fission, how feasible is a fusion reactor utilizing...

Summary:: Help needed on how to calculate on spontaneous fission and effect from alpha decay Heat from alpha decay from Pu-238 is used to generate direct current. At the beginning (1977) it generated 470W, how large is the effect now? And if the efficiency between the electricity and heat...

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...

What is defined as "fission"? Isotopes that undergo "fission" under influence of fast neutrons, though not slow neutrons, are classified as "fissionable". Is Be-9 fissionable? What is the dividing line between "fission" and "cluster decay"?

Assumptions: 1) Fusion reactors are easily obtainable. Every spacecraft or hover-car has one. 2) Fusion reactors are neutron sources. 3) Neutron sources are the "difficult bit" in the enrichment of uranium and plutonium. 4) Uranium and plutonium are "freely" available in asteroids or...

I am trying to simulate fission product ejection from thin fissile films in gas filled detectors (fission chamber). Does MCNP 6.2 produce recoil fission products that will be transported through the system? I have enabled "heavy ion physics" (#), tried options 3 and 5 for NCIA on the neutron...

Hi everybody, I am trying to score fission spectrum in MCNP for a kcode calculation. I would like to check at which energy neutrons produced by fission are generated. I have no idea how to perform since tallies are usually volume or material dependent and I just want to build a spectrum...

I'm not sure where to start

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...

a dusty plasma design : https://www.nasa.gov/pdf/718391main_Werka_2011_PhI_FFRE.pdf has nuclear fuel held in place by electromagnetic fields. It uses a very massive moderator around the fuel to slow and reflect neutrons back to the fuel, to enable continued fission. But, there is one kind of...

Whats the minimum kinetic energy a neutron must have in order to trigger the fission of for example a lithium core ?

There are a lot of fission products accumulated in the fuel pellet and gap in the fuel cladding during PWR operation. Howeve, some iodine and noble gas will release to the primary loops in case of fuel failure. The fission product release rate can be described as the escape rate coefficent which...

Homework Statement: Calculate energy released in the reactions below, and compare them (see full question below) Homework Equations: a) FISSION: 1g of U-235 splits into La-148 + Br-87 b) FUSION: 0.5g of D2O with 0.5g of T20 creates He-4 and a neutron useful equations: E = Δm(c^2) Hey, can...

Hello, Quick question: in fission, which is a nuclear reaction, a large element is hit with neutrons and broken/split into two smaller elements while lots of energy is released. Does the starting element, which must be large in size (like uranium-235 or plutonium-239) need to be an element that...

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

In fusion reactions, lighter nuclei are combined into heavier ones (atomic mass increases); so the direction is from left to right (shown on the diagram). Therefore, in the fusion of 'light elements' the total final binding energy is higher (the related arrow points upward); so ##B_2-B_1>0## and...

The best-known classes of nuclear transmutations are fission and fusion: Nuclear Fusion Under normal condition, nuclei do not stick together; because they repel each other at large distances (due to the electrostatic repulsion 'barrier') and thus the strong nuclear force cannot act. But if these...

Hi, i am new to simulation and for my thesis i have to make a simple simulation by using mcnp4c2. Is anybody familiar with this version of MCNP? I need to calculate the fission reactions per second in a geometry of a spherical sub critical reactor of Uranium with low percentage of U 235 with...

Hi, I haven't studied much nuclear physics and would be very grateful if someone could answer a few basic questions I had about fission in the fuel rods on how the water is actually heated in the reactor core: 1) I don't know if I have this correct but is it that the way the water is heated in...

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. My high school physics book doesn't elaborate the idea of binding energy and how it's related to fissions and fuisions adequately in a way that made me have wrong thoughts about these ideas. What i understand after doing some research is that: - Binding energy is the energy that has to be...

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...

So I was trying to debunk a conspiracy theory involving bombs and I realized that I have a small problem with Einstein's equation: E=mc2 To be honest I haven't really understood how it's used... I mean, how far should the fission go until as much energy as E=mc2 is released? Does the matter have...

Does terrestrial spontaneous fission or natural fission create unstable isotopes similar to nuclear fission in reactors?

Hi, I've been wondering about this a lot and I didn't find a satisfactory answer by myself. My professor said that in order to promote a fission reaction you need to provide a certain amount of energy (like in a chemical reaction you need to overcome the activation energy) and the easiest way...

Looking at a humble smoke detector - a metal plate with some alpha source on one side. I guess the fission products / apha etc emitted in one direction are absorbed into the metal, and the opposite direction go into space. So there should be a minute net force ? Would that be useful as a "sail"...

I use ENSDF to get information about gamma energies and emission abundances for various nuclides. Now I need to know data about Cf-252, in particular the abundance of spontaneous fission and the average number of emitted neutrons per fission. Where can I find this information there? Just as a...

If energy is released during nuclear fission, why is the mass of the products (the two new nuclei and fission neutrons) greater than the mass of the original nuclei? In accordance to E=mc^2, shouldn't the release of energy result in the products having a lesser mass than the original nuclei?

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...

Homework Statement An unstable nucleus with mass M is in an excited state with excitation energy E* and undergoes spontaneous fission into two daughter nuclei "1" and "2" and zero fast neutrons. What will be the kinetic energy KE (in MeV) of the daughter nucleus "1"? M = 233.9493amu E* =...

I would like to learn the initial quantities of all fission products for a 50% fission (nuclear yield) of 1g of U235. I roughly understand that that there could be over 200 fission products produced upon nuclear fission of U235. Is there any tools available for the above estimation ? Learned...

Hello. My name is Dom Napolitano and I would like to create a thread on Nuclear Power Technology.

If you set up a proton beam, intersected the proton beam with an electron beam, and made sure the electron beam (or possibly the proton beam) was high enough energy to compensate for the missing electron anti-neutrino, could you produce a neutron beam? Could the neutron beam then be used to...

In Wikipedia I read that Uranium-235 is a nuclear is fuel in fission reactors, also that Uranium-235 is split (fission) and energy is revealed. But in some images showing how nuclear reactors work, they show Uranium dioxide as nuclear fuel elements. In Wikipedia, it's written that the oxides...