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High Energy, Nuclear, Particle Physics

- Properties, relationships, and interactions of subatomic particles. Exp. & theo. physics of nuclei & elementary particles
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Jan16-12 Greg Bernhardt
God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...
Jul18-14 12:32 PM
ChrisVer
187 62,222
rules Sticky Thread Pinned: Forum Rules
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:41 AM
ZapperZ
1 25,862
Hi, I'm confused about a statement about the change in final/initial states of the daughter/parent atom in an alpha...
Mar7-13 07:32 AM
mfb
3 872
Hi, I'm a student of Nuclear Engineering (MS level) at University of Dhaka, Bangladesh. I completed my Honours and...
Mar6-13 08:32 AM
Einj
1 663
I am fairly new to nuclear chemistry and I was just curious as how to find the half life of a helium nucleus. Would it...
Mar6-13 08:03 AM
Vanadium 50
9 1,143
Not sure if applicable here but I was doing some reading on ITER the fusion reactor. I have read about "Test Blanket...
Mar4-13 09:31 PM
Astronuc
1 755
Since the pi^0 decays to two photons its C-parity is +1, but its isospin ket is $$|1,0\rangle,$$ which makes it a...
Mar1-13 05:03 AM
Bill_K
3 682
(1) What do people make of NASA'a page on Low Energy Nuclear Reactions? (2) Is there anything to the...
Feb25-13 08:09 AM
ZapperZ
6 2,498
In a vandee graff generator, there is a way to charge the belt via friction with the lower roller. There are lower...
Feb24-13 11:56 PM
plasmon
0 609
Why is it that those atoms, with atomic numbers of 90 and 92 have much, much longer half lives than atoms like Radon,...
Feb24-13 05:48 PM
Bill_K
8 1,318
edit* -Delete
Feb24-13 12:49 PM
FeynmanIsCool
0 690
Hi can anyone explain what a quadratic divergence is? and if so how it effects the mass of the scalar field i.e why ...
Feb24-13 08:51 AM
andrien
3 868
What are the accepted numbers for the decay rate and lifetime of Z-> mu+mu- and Z-> e+e- decays??? also what is the...
Feb24-13 05:23 AM
mfb
2 1,235
If two quarks are in a S=1 state, are they in either ##|\uparrow \uparrow \rangle ## or ## |\downarrow \downarrow...
Feb23-13 07:12 PM
Gregg
5 878
I've been trying to understand the exact differences of a particle and its corresponding antiparticle.I know maybe the...
Feb23-13 08:46 AM
Shyan
10 1,247
Hi I have a question about a popular science article from BBC, you can ofcourse read the whole article but the part...
Feb23-13 07:28 AM
Simon Bridge
6 1,274
Hello, now I'm reading Peskin Shroeder. I have a question about the Casimir operator on page 500 in Chapter 15. ...
Feb22-13 10:35 PM
Wonchu
2 875
I seem remember hearing that spin-1 was ruled out but since reading this paper I am unable to find any info on spin-1...
Feb22-13 08:19 AM
Bill_K
2 172
Hello, I am a PhD student in geology in need of help from a physicist! Can somebody spot the mistake in my...
Feb21-13 02:57 PM
mfb
1 876
Hi, i have a question, what's about Einstein 'information keeping' law in matter and antimatter annihilation process,...
Feb21-13 01:43 PM
mfb
1 621
My question has a few sub-questions. How long does an area stay contaminated, say after a bomb? A reactor leak? ...
Feb21-13 10:01 AM
mfb
5 2,878
I am reading the paper "Covariant Action for a D=11 Five-Brane with the Chiral Field" and want to make an analog for...
Feb21-13 08:30 AM
rbwang1225
2 1,486
In this articlehttp://arxiv.org/abs/0802.3525, the authors present the inhomogeneous equation $$\ddot{\phi}_2 +...
Feb20-13 10:52 AM
Forhad3097
2 1,072
If we tried to make elements higher than Helium in a terrestrial fusion reactor, what elements could we realistically...
Feb20-13 08:58 AM
Astronuc
16 2,045
Various news outlets are reporting a AAAS talk by Joe Lykken which appears to be about vacuum instability based on the...
Feb20-13 12:26 AM
bcrowell
2 1,172
I would like to hear opinions on the variation in decay rates as described by Fischbach and coworkers and how (if at...
Feb19-13 11:58 PM
bcrowell
3 1,290
As objects approach the speed of light, according to Special Relativity, they gain mass. But when this happens, what...
Feb19-13 05:52 PM
mfb
4 835
So apparently a neutral pion is a superposition of u\bar{u} and d\bar{d}. I'm having trouble understanding what this...
Feb19-13 06:37 AM
andrien
2 851
http://cosmiclog.nbcnews.com/_news/2013/02/18/17006552-will-our-universe-end-in-a-big-slurp-higgs-like-particle-suggest...
Feb19-13 02:15 AM
fzero
1 2,265
In my book it says for the ##\pi N ## state: ##|\pi N; \frac{3}{2},\frac{3}{2}\rangle =|\pi ;1,1\rangle | N;...
Feb18-13 11:51 AM
Gregg
4 738
If you have a meson in the states ## ^3S_1## and ## ^1S_0 ## this means that ##J^P = 1^+ ## and ## 0^+## doesn't...
Feb18-13 11:22 AM
Gregg
0 516
You Know all the LHC machine at CERN, and the CMS detector (Compact Muon Solenoid) This detector run a CMSSW ( CMS...
Feb18-13 06:58 AM
Vanadium 50
6 933
Hello! Im studying Quamtun Field Theory, more concretely, Greens functions of Klein-Gordon equation. I can...
Feb18-13 04:28 AM
javiepe
0 535
Hey, I'm trying to get my head around neutral Kaon oscillations. As far as I understand it neutral Kaons can...
Feb17-13 03:22 PM
mfb
8 884
This comes form the wiki article on quarks: Does that mean that when two Quarks come as close to each other as...
Feb17-13 06:48 AM
Bill_K
2 2,192
Hello! Im currently taking a course in RQM and have some questions for which I didnt get any satisfactory answers on...
Feb17-13 06:39 AM
Kontilera
9 1,083
I have some basic questions about gravitons. If you have two particles with mass, do they "exchange" gravitons, if...
Feb16-13 09:41 AM
negru
14 1,482
News reports have it at 4.9 magnitude and a depth of 1 kilometer The USGS appears to have it at 5.1 and the depth...
Feb13-13 02:12 AM
Borek
1 768
How do gravitons mediate the force of gravitation in universe ?
Feb12-13 09:56 AM
tom.stoer
5 1,213
I am considering the occurence of an incident circularly polarised EM wave on a ground state hydrogen atom. The...
Feb12-13 04:50 AM
andrien
4 872
Basically i'm trying to find out how to find the maximum distance between two deuterium nuclei in order to overcome...
Feb10-13 02:03 PM
bcrowell
1 874
The parity operator has eigenvalues of +/- 1 and particles can have intrinsic parity of +/- 1. What does it matter?...
Feb10-13 08:06 AM
mfb
1 698

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