Nuclear Definition and 997 Threads

Hello, I'm attempting to model a 300x300x300 cm room in MCNP with a doorway and walk-in section, but I'm struggling with some of the cell definitions, particularly in the Z plane. I've attached the input deck below. It is fairly short, so it's probably going to be a relatively quick fix. Any...

Phys. Rev. Lett. 134, 063002 – Published 11 February, 2025 https://journals.aps.org/prl/ Probing New Bosons and Nuclear Structure with Ytterbium Isotope Shifts Menno Door1,2,*,†, Chih-Han Yeh3,*,‡, Matthias Heinz4,5,1,§, Fiona Kirk3,6, Chunhai Lyu1, Takayuki Miyagi4,5,1, Julian C. Berengut7...

Hey everyone, I’m starting my masters in nuclear engineering in about 6 months. The thing is I graduated six years ago, so I’m a bit rusty(more than a bit actually), so I’d appreciate any advice on which math and physics topics I should review to be ready for the program.

Hello Dear Experts. I need help with the calculation of total thermal power in nuclear reactors. Can someone explain the general mathematical approach or provide useful formulas for this calculation? Thanks!

Hey all. I am creating an MCNP input deck but my geometry is appearing red in the vised plot and I am receiving errors relating to the geometry and material card sections. Could anyone potentially help me figure this issue out?

Im a younger student who has a profound appreciation for particle, theoretical, and nuclear physics.

Dear aerospace guys, From time to time, I think about nuclear thermal propulsion. As a nuclear enthusiast, I'd love to see nuclear reactors in space. Regarding Nuclear Thermal Propulsion (NTP), I understand that it theoretically offers a higher specific impulse compared to chemical propulsion...

Some time has passed since this accident happened but this morning I couldn't sleep and a though occurred. Back in 2011 when the tsunami flooded the diesel generators and knocked out offsite power to the Fukushima power plant, yet the reactors themselves were ok and their ability to work (at...

I was scrolling through YouTube and saw this video: The video showcases the Project Orion rocket. Project Orion was a theoretical spacecraft propulsion concept which uses nuclear explosions to propel a rocket. Opening the comment I further learned that it was discontinued due to Nuclear Test...

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

Hello Physics Forums, I come from the math/statistics side. I have no formal Physics training beyond basic physics in university. But I do work with some hardcore nuclear medicine physicists... the kind that build their own novel PET/SPECT scanners and stuff like that. Anyway, my mathematical...

Hello all, I have a question for those with knowledge of Nuclear Physics career outlook. I am at a point where I need to decide soon. I know I want to go to grad school, I know I want to study Nuclear Physics, but I'm a little torn between which method of study to undergo. I would not mind...

Hello, I recently had radioactive iodine treatment for thyroid cancer. Took 98.9 mci of RAI on 8/28. I was away from my children for 4.5 days and kept the appropriate amount of distance from my husband in the first few days of isolation (not sleeping in the same bed, six or more feet away from...

In what cases the force of the strong nuclear interaction (between nucleons or between quarks) is the force of repulsion? Thank you.

PF should keep up with the times https://www.livescience.com/planet-earth/nuclear-energy/physicists-solve-nuclear-fusion-mystery-with-mayonnaise :wink:

Assuming I have a given wavelength λ of the hydrogen spectrum and I want to calculate the nuclear mass of the isotope, is my approach correct? Rydberg-formula: $$\frac{1}{\lambda} = R_M \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right)$$ with $$R_M = \frac{R_\infty}{1 + \frac{m_e}{M}}$$...

There are reports of a series of problems at the Rostov Nuclear Power Plant. Shutdowns, regional power outages, radiation releases, and runs on iodine. Is 1.5 million curies a lot to release?

Joining this forum to learn and talk about next generation nuclear. I'm a chemical engineer currently in pharma (process R&D for small molecule drugs, a rather different field, at a Japanese company) interested in contributing to next generation nuclear. Especially interested in chemistry...

Hi everyone, I'm trying to compare 3 different fuels and MCNP and I want to recover the burnup of each. When I do that however, I get identical numbers for burnup, which doesn't make sense to me, as they have different materials (LEU vs LEU+ vs a thorium-based fuel). Does anyone know what...

I hope this is the right forum right now I’m a 2nd year physics student in the United States and I’m really interested in nuclear/plasma physics. The thing is that I know the U.S. has great national labs to do internships at and good graduate schools here but I’m also interested in studying...

This question is in the book " Introduction to nuclear engineering by Lamarsh" Chapter3: I think it's pretty basic but I couldn't find the proper way to prove it, and now I even suspect that it's not a correct question. My attempt solution: I would very much appreciate your help. Thanks in...

Yes,, I know, it may not be the most obvious route but I had already submitted the subject preference list to the university and there is no way to change it. (Therefore, I beg you to not make me regret my choice, since, there is just no way to revert it) . The math I am going to learn from...

I'm taking my next steps as my main dream is to have a pHD work in a research setting like a lab that's harder said then done. I got accepted into a BS program that's nuclear medicine and I'll be doing some more physics as well so hopefully the goal is to learn more physics and there...

I've been a long-standing member of PF a few decades ago, and now I take up things again after more than 10 years of absence. I'm into nuclear scientific instrumentation, with a special interest in theoretical physics (but not as theoretical as in my younger years). I've a degree in electrical...

Conservation of charge: The sum of the charges on all the particles before and after a reaction are the same I was considering this reaction: n + 3 He → 3 H + p + 0,764 MeV Making the charge balance I have: 0 + 0 (2protons + 2 electrons) → 0 (1proton + 1electron) + 1 (proton) There is...

Hey all. Quick questions for all you NEs and nuclear lovers out there. I am currently finishing up HS and need to decide a major for college. I am trying to decide between EE and NE, but am strongly considering NE. I have always loved nuclear energy and anything related to nuclear in general...

I am thinking about lambda, the nuclear decay constant and what it actually means. I have built spreadsheet models looking at decay using lambda to determine the decay for each time period and then comparing the number left to that determined by using e ˆ- lamda x time. These are my...

Are there any big HEP conferences (with papers or podcasts available online to non-participants) coming up soon?

If we consider a nuclear decay in which element X decays into Y and an alpha particle, we can see that the total energy released is ##c^2(-m(\alpha) -m(y) + m(x))##. If we replace ##m(alpha)## with ##s(alpha) - be(\alpha)/c^2##, and similarly for the other particles, X and Y, we can see that...

A California company Kairos has received a permit to build a non power producing salt cooled nuclear reactor at Oak Ridge Tennessee.The reactor is considered safer since it uses a low-pressure mixture of molten fluoride salts of Lithium and Beryllium called FliBe. Molten salt reactors are not...

Is it possible to create something like a circuit powered by the strong nuclear force rather than the electromotive force of a battery? If so, what would be examples of some conductors and resistors that could go in such a circuit?

Blogger about nuclear energy and enthusiastic amateur photographer.

If you are lucky enough to have copious amounts of hydropower, you may be able to. But aside from that, I can't see how it can be done. In Australia, we have a policy of net zero by 2050, but it is beyond me how you can do it without nuclear. However, Australia has banned nuclear...

Is it realistic to switch from atomic theory to nuclear or high energy theory?

Sorry for bad english, does anyone know where I can purchase a spherical vacuum chamber made from metal, that preferably ships internationally ?

https://www.utilitydive.com/news/nuscale-uamps-terminate-small-modular-nuclear-reactor-smr-project-idaho/699281/ Published Nov. 9, 2023

I am looking but I could not find the complete list of fissionable and fissile isotopes. Do you know where I could look?

Here, SP stands for source probability. But probability needs to be normalized. Here values in SP3, SP4 are larger than 1, It means that SP is not ordinary probability here. But what actually SP represent here?

Working on a project where I need to model nuclear reactions with different fuel pellet shapes. Does anyone have recommendations for software that's good for this? Any advice or experiences are also welcome!

A colleague (PhD Physics, no weapons experience) asked me (MA Physics, with DoD work experience) about the Betatron nuclear trigger in the early Fifties. I know it used a toroidal accelerator to produce an electron beam impacting a Beryllium target, but I don't remember (and cannot find) any...

A bellows failed at the LHC near IP8 (LHCb). It has been replaced and the sector is cooling. Beam is expected on or near September 11. There will not be enough time to return to high luminosity pp running, so the run plan for the rest of the year is low luminosity special pp running and heavy...

Hello, After some time away I've gotten back into MCNP. I've been in the field of Nuclear Engineering for over ten years, but I recently changed jobs and need to use MCNP. I'm trying to get my skills back up, since I haven't been using it as much in my old job. Looking forward to some great...

Particle display in visual editor of mcnp input file only shows particles inside source, I am interested to see particle path towards tally region. Plz guide thanks

How do you know which binding energy shell to use? In the solution it uses K and L2. Why specifically L2 and not L3 or L1 for example? And what should I do with the information to omit electrons lower than 20kev? I initially thought that meant to omit the electron binding energies lower than...

Hello! I am not sure if this is the best place for this question, but I want to make a simple illustrative drawing (for a presentation given to people both with and without physics knowledge) of a nuclear magnetic octupole moment. For example for a magnetic dipole I can use a magnet as a...

The problem comes with solutions. However, I dont get the 3 steps in the solutions. Why do they calculate decay for 120min in step 3? And why is only the daughter nuclide relevant and no granddaughter? There might be something lacking in my knowledge about nuclear reactions. Also, I don't know...

The SNO+ Experiment in Canada is still in development, but analysis of early antineutrino detections as published in Physics Review Letters and as referenced in the SNO+ results page are believed to be from appear to be the from Ontario reactors 240Km away.

En=0 Ek(B)=0 Q=Ek3(α)+Ek4(Li) --Q=Ek3(1+m3/m4) (1) p3=p4 /^2 -- 2*m3*Ek3=2*m4*Ek4 --- Ek4=m3/m4 * Ek3 (2) (1) and (2) Ek4= m3/(m3+m4) * Q, but I'm not sure how to find m3 or m4 and if this is true

From which site and article can I find a table or information about alpha emitting radionuclides used in nuclear medicine?

Hi all I am a little bit confused about the definition of angular frequency in the context of nuclear rotation, some times its defined in the regular way as $$ E=\hbar \omega $$ and other time from the rigid rotor formula $$ E=\frac{\hbar^{2}}{2I} J(J+1) $$ where ##I## is the moment of inertia...