Neutrons Definition and 224 Threads

How much do the neutron fields (including the reflector) weaken on the reactor protection?

Statistical mechanics might as well be Klingon as far as I can read it, so interpreting an academic physics paper can be tricky. Still, this paper here https://arxiv.org/pdf/2004.12065 struck me as intriguing. I'm pretty sure this paper is about the innards of protons and neutrons, which I find...

I am trying to solve a problem from Thorne and Blandford: Modern classical physics, chapter 3, problem 21: Neutron diffusion in nuclear reactor. I am struggling with how the equation, from which this should be calculated, should look like. I watched some videos where they did the derivation a...

I have long pondered the question of whether it is possible to extinguish an ongoing atomic explosion. From a practical standpoint, it is certainly possible that currently it is a supernatural, if not impossible, task. However, from a theoretical standpoint, I cannot stop thinking about all...

Why can't we construct a particle consisting of only neutrons? Why are there nuclei of ##_2^3He## (2 protons and 1 neutron) and ##_2^4He## (2 protons and 2 neutrons) but there is no ##_2^{50}He##? Maybe a first approach might be that neutrons and protons interact with each other not through the...

I have been banging my head against this for a few weeks now; tweaking the simulation, adjusting my calculations, and searching around the web to try to find an answer. I can't post questions on CERN's Fluka help forum so this seemed like the best option. I really appreciate any help you can...

Hi PF, I am new here. I'm trying to perform a risk assessment to enumerate, and then take steps to mitigate, the risks posed by building a fusor and performing nuclear fusion. The risks as I see it are: 1. Electrical hazards posed by the high voltage equipment 2. Potential fuel-air explosion...

14MeV neutrons in MCNP interact with carbon without producing alpha particles and protons, yes Questions about my cross section data? I've tried ENDFB8/B7.1, JEFF3.3, JENDL5, CENDL3.2 without any results, but if you use phys:n model, it looks like alpha particles will be produced, but it doesn't...

Besides the energetic preference (lower threshold, and more phase space above)? Antineutrino capture is a weak process, so it can and does change quark flavour. p+ν=n+e+ is actually uud+ν=udd+e+ that is u+ν=d+e+ But given enough energy (like cosmic ray neutrinos), do antineutrinos also get...

I'm trying to understand why neutrons don't just continually bind into large masses. As I understand it proton binding in a nucleus is governed mostly by the strong nuclear force which attracts at close distance and electromagnet force that repels. So for protons to bind, they must have enough...

I was reading another article when this headline from June 22 caught my attention. Collisions hint that four neutrons form a transient isolated entity https://www.nature.com/articles/d41586-022-01634-x An experiment firing helium-8 nuclei at a proton target has generated evidence that four...

If a magnetar is a neutron star, how do the neutrons composing the star generate a magnetic field? A neutron has zero charge, so it generates no magnetic field.

Can you tell the difference between two neutrons in an alpha particle? In one alpha particle, we know that the sum of the spins of two neutrons is zero. Can a neutron with upspin and a neutron with downspin be distinguished from each other? Or can't you tell because it's superimposed?

Hello, I am a student who started studying MCNP. I'm not used to writing in English, so I'd appreciate it if you could understand even if there were grammatical errors in my thread. I want to check the energy of gamma rays from neutrons reacting with matter. So, I wrote this in the content of...

Hi Is it possible to get two neutrons to fuse together to form helium? If so, would it not make cold fusion possible?

When we learn about the scattering of a particle, the context is usually a charge shooting towards a Coulomb potential. With some assumptions, we can derive the scattering cross-section pretty reasonably. Therefore, the scattering cross-section of different elements in X-ray spectroscopy is...

Lets say, in zero gravity space, you have an incredibly precise collider that slams protons and electrons into each other as perfectly as possible such that all momentum is canceled out and the resulting neutron has no velocity relative to the observer. As protons and electrons continue to...

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...

https://www.theonion.com/physicists-hail-major-breakthrough-after-discovering-ne-1844363984 "Confirming the search for the mysterious Godfather particle was finally over, physicists at the University of Chicago hailed what they call a major breakthrough Monday after discovering neutrinos are...

How do you turn fertile material to fissile without fissioning when they are afterwards are hit with neutrons again?

Could the mysterious force of gravity be the force of neutrons being attracted to each other? (There is nothing to suggest this it was a random thought that occurred to me this morning.)

Regarding electricity generation from a fusion reactor: I can't seem to find any discussion about the percentage of fusion product neutrons that can be realistically caught in the thermal blanket to utilise the energy they carry from the fusion reaction. The neutrons from fusion have to be...

Does one neutron or more than one make different when they interact with the nuclei? what is the result that could happen if one neutron or neutrons hit the nuclei? I'm not sure but I think the neutrons are the most confusing particles to deal with. I wish you guys can help me Thanks

For Elastic neutron interactions with matter, they mentioned that the neutron will collide with atomic nucleus and the recoil nuclei quickly become ion pairs and loose energy through excitation and ionization. How does this nuclei become ion pair? It is when the neutron interact with it and...

Surely the real efficiency of Fusion power is the percentage of neutrons that can be caught to extract kinetic energy from. I am assuming it is the neutron that is carrying the nuclear energy that can be recovered from the fusion reaction. Now I'm pretty sure neutrons cannot be focused, so the...

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)?

I where looking for elements that can absorpt neutrons without generating radioactive materials, and I found that most of them in Earth are suitable. I found that could work: C, O, Si, S, N, H The most common isotopes can receive one or two neutrons being stable, but if a neutron would be...

Please let me know if the following reaction is possible for high energy electrons colliding with neutrons or neutron-rich nuclei: n+e^{-}\to \Delta^{-}+\nu_e.\tag{1} If it is forbidden for some conservation law or for some other reason, please give me an explanation why. This reaction is...

Homework Statement Fission, the process that supplies energy in nuclear power plants, occurs when a heavy nucleus is split into two medium-sized nuclei. One such reaction occurs when a neutron colliding with a 235U (uranium) nucleus splits that nucleus into a 141Ba (barium) nucleus and a 92Kr...

if we teleport a small amount of millimeter cube of a neutron star outside it, will it remain still as a very dense heavy neutron clump or will it revert back into its components (iron) or will the neutron destabilize and turn into cosmic radiation of neutrons which then turn back into hydrogen?

Hello everybody! I am TanX. I was reading about neutrons in a gravitational field, which was based on the Grenoble experiment ( Institute Laue - Langevin ) conducted in 2002. I have put a link down here to the research papers below ( Refer to page number 17 in the booklet for the important...

Neutron and proton are themselves not composed of mesons, then how do they emit these particles inside the nucleus?

Does anyone have a reference to a good explanation of this experiment. I am looking at https://quantummechanics.ucsd.edu/ph130a/130_notes/node323.html I am unable to comprehend the reasoning by which it determines the parity of the two neutrons in the final state. Particularly when it says the...

Homework Statement A collection of neutrons, nominally at rest, are confined in a region 1.0 nm wide on the x-axis at a height of 50 cm above a neutron detector. The neutrons are released and fall under the influence of gravity towards the detector which records the horizontal position of the...

Homework Statement A collimated beam of thermal neutrons emerges from a nuclear reactor and passes through a speed selector into a detector. The number of neutrons detected in a second with speeds in the range 4000 to 4010 m s−1 is twice as large as the number per second detected with speeds in...

Homework Statement Estimate the velocity of thermal neutrons at 25 degrees celcius Homework EquationsThe Attempt at a Solution I attempted to use KE=0.5mv^2 but I realized that I didn't know the Kinetic energy

Homework Statement An isotope of which element has a mass number of 111 and has 5 more neutrons A- Antimonu B- Cadmium C- Iodine D- Tin E- Xenon Homework EquationsThe Attempt at a Solution I don't know where to start

Hi, As you may know, the following equation gives the number of neutrons absorbed per cm3/sec in a resonance region. Fa=Φav∫∑a(E) dE So, it is said in Lamarsh, introduction to nuclear engineering, that Φav depends on temperature. I do not get this because I know that the flux is something we...

I understand that there are fuel rods, water control rods. I also understand that fuel rods are metal tubes filled with special U235 pellets. Finally, I understand that water slows the neutrons down enough to collide. How do the neutrons and U235 nuclei get out of the metal encased fuel rod...

If star start from a big ball of hidrogen and the all the neutron to make helium. Thx for help!

My physics is not good, please kindly don't judge my physics. In some molecular weight calculator to get mono-isotope neutral mass for atoms listed below. In FTICR, we could find these difference. For example, m/z 101.960035, ^1H^35Cl^16O3^18O m/z 101.952838, ^1H^37Cl^16O4 Here is my question...

Is there any type interaction between neutron and matter other than strong interaction? When a neutron elastically or inelastically scattered, does the strong interaction still govern the whole process? Thank you!

When a target material is irradiated with neutrons, a number of nuclear reactions are possible. For the slow neutron activation of 28Si, 29Si is created. Determine what is created if 28Si is irradiated with fast neutrons. Then, consult the National Nuclear Data Centre...

Hello, I am reading about this and I have a question , so let me explain how I understood this and please correct where I am wrong. I will ask about nuclear reactors because obviously in bombs only prompt neutrons matter since there is no need for any control only an exponential increase in...

Hi, As we know, neutron does not have charge so it can not interact with any other particle with coulombic force. But in the reactor core fast neutrons can be slowed down. Does strong interaction govern this slowing down process?Thank you.

Hi, I have a question related to 238U. I know of course that it can fission with neutrons above 1 MeV, but there is a elevated risk it would absorb the neutron and produce 239Pu instead. Let's assume you have a ram of metallic 238U, with perhaps 0,7% 235U, and that you collide it very very...

Hello guys ! How are you ? So, I am a senior student and we're studying nuclear transformations. Well long story short our teacher tell us that in a nuclear reactor we make a surface with cadium to absorb the neutrons ! And than a problem was created in my head ! Please help ! I don't...

I apologize in advance for not being familiar with LaTex. 1. Homework Statement One thousand neutrons are in an infinite square well, with walls x=0 and x=L. The state of the particle at t=0 is : ψ(x,0)=Ax(x-L) How many particles are in the interval (0,L/2) at t=3? How many particles have...

Reading this article - http://hyperphysics.phy-astr.gsu.edu/hbase/particles/proton.html#c4 there is a statement - "A free neutron will decay with a half-life of about 10.3 minutes but it is stable if combined into a nucleus." So is it only free neutrons that decay into protons? In...

Hi there, I have a problem to solve in Cosmology which says: "Write the formulas for the quantum kinetic energy of neutrons, protons and electrons as well as the formula for the gravitational energy for a neutron star that is comprised of free neutrons, protons and electrons in a ratio of Nn ...