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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
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:41 AM
ZapperZ
1 25,932
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 62,493
Anyone of you guys read this month's Scientific American?? The one on that our inflationary model of our Universe may...
Mar9-09 02:34 AM
malawi_glenn
23 3,193
Hey, I've been a little confused on the concept of gravitons. I know that they are the messenger particle of the...
Mar7-09 03:16 PM
pallidin
10 2,737
There seems to be a strong theory that the electron could be a 'naked' singularity or maximal Kerr black hole (maximal...
Mar8-09 06:43 PM
George Jones
11 4,855
Any ideas here? For that matter, why should the spin of each particle always be the same? Or can we do no better...
Mar9-09 02:31 AM
cragar
20 7,973
Imagine you have electron and positron (leptons) falling towards each other. The interaction between these two is...
Mar2-09 01:46 PM
Bob S
30 3,765
Why in an linear accelerator, like the Cock Croft Walton accelerator, in which protons would strike a solid piece of...
Mar3-09 10:59 PM
Bob S
2 3,331
I'm just learning renormalization in QFT and have a few basic questions: 1) It seems to me that renormalization has...
Mar1-09 02:59 PM
Bob_for_short
9 3,301
Im trying to make a partical excelerator for school using - ions but i cant find any b prints or any one who can help...
Mar2-09 01:26 PM
Bob S
1 1,976
If quantum gravity exists, then gravitons are responsible; however, it seems to me as if a body of matter would need...
Mar10-09 08:46 PM
humanino
13 2,195
Hi all, I was wondering what effect does gravity have on a subatomic particle? I know that physicists have been...
Mar1-09 03:41 PM
Vanadium 50
8 3,705
I want to get myself clear on sometihng fundamental, so please correct any of my thinking. As I understand it, an...
Mar13-09 08:35 PM
Bob S
10 1,727
I understand that they are looking for, and are hopefully close to finding the Higgs Boson, either with the Tevatron...
Mar3-09 04:41 PM
Dusty_Matter
23 3,060
I'm having some doubts about the standard idea of N14 + energetic Neutron > C14 + Proton. Is it possible that the...
Mar15-09 10:25 PM
silverslith
9 3,449
Hey all, I had a somewhat technical question concerning recent news events. My background in physics and mathematics...
Mar2-09 09:15 PM
hamster143
2 1,993
This is perhaps a stupid question but: When we use natural units and set h=c=1, do we choose appropriate units so...
Mar3-09 10:43 AM
blechman
10 2,304
I have heard many people use the term power counting before but I cant find any explanation of what it means. All I...
Mar2-09 05:36 PM
distanceless
1 4,708
Context: In beta-decay the kinetic energy of the electron is continuous. This led Pauli to the conclusion, that the...
Mar3-09 12:04 PM
jtbell
3 2,607
When I studied renormalisation for the Ising model the procedure was to sum over every second spin and then find a new...
Mar5-09 04:53 AM
genneth
1 1,064
I have a decent understanding of neutron-induced reactions in heavy nuclei (fission, capture), but less so when light...
Mar11-09 07:33 PM
Bob S
3 4,187
Some papers I am looking over at the moment mention both additive and multiplicative renormalisations. What is the...
Mar9-09 06:21 PM
Bobhawke
5 5,710
What is the minimal mass of a neutron star, if the semi empirical mass formula is used?
Mar6-09 06:57 AM
malawi_glenn
11 3,230
Hello, It may not be the best place to ask but that is the best place I found :) So I have been trying to...
Mar6-09 08:02 PM
hamster143
4 2,795
I have been going through some papers on lattice QCD lately, and many of them mention "topological charge". I was...
Mar6-09 10:12 PM
humanino
1 5,466
i cant seem to find any straightforward descriptions of it for why+when its needed. Plus im really confused as to how...
Mar7-09 05:29 AM
malawi_glenn
1 1,327
http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/lepton.html how were these things measured+discovered? are any...
Mar7-09 06:04 AM
dangerbird
2 1,556
I'm taking 5 mins (hours) during some down-time to remind myself of some theory. Taking a simple Abelian Higgs model,...
Mar8-09 04:27 PM
bomanfishwow
2 1,590
Is there any on-line reference which describes the interaction of high energy (> 100 Mev) gamma rays with matter. ...
Mar10-09 10:28 PM
humanino
8 1,911
are antimatter particles the explanation for why particles in a bubble chamber seam to disappear? ive read some on...
Mar14-09 05:39 AM
malawi_glenn
8 1,521
Would anyone notice (unless they were looking for it) that the mass of a particle species had a span, rather than a...
Mar11-09 01:44 AM
Phrak
8 1,745
In Antimatter production in a labratory, does anyone know the principle element used to generate antimatter such as...
Mar11-09 08:15 AM
Vanadium 50
3 4,098
Ok, well I'm sorry if this is the wrong section but it has to do with energy and nuclear physics. I have to present...
Mar11-09 06:31 PM
Bob S
3 1,362
Hello all, lets think we have a segmented gamma-ray detector. when a gamma-ray interacts several segment of the...
Mar12-09 02:50 PM
Bob S
1 1,394
1. The Standard model is an SU(3)xSU(2)xU(1) symmetric theory. To me this means that if you choose any 3 members of...
Mar13-09 02:42 PM
hamster143
11 1,708
I am reading a paper right now on lattice QCD that presents a "method ...
Mar13-09 11:08 PM
Bobhawke
3 1,687
The Gell-Mann - Nishijima relation can be rearranged to show that there is an absolutely conserved quantity which is...
Mar14-09 12:27 PM
Jonathan Scott
3 2,492
Hi everybody When fast neutrons hit isolated protons (eg. hydrogen cores in paraffin) the neutrons kinetic energy...
Mar15-09 12:00 PM
Astronuc
2 2,122
Hi, I've been measuring the flux of cosmic ray muons as a function of zenith angles. I have calculated the flux but do...
Mar17-09 05:02 AM
Vanadium 50
1 1,476
Sorry for this being a really general question but I am a bit confused what it means when it is stated that a particle...
Mar17-09 08:08 AM
Meir Achuz
3 1,240
Hello! I was wondering if someone could help me with a problem of units! I'm currently deriving probability...
Mar16-09 09:33 AM
clem
1 1,912
Hi, I'm trying to remind myself of exactly what, physically, is the difference between V and A couplings. Now, a...
Mar17-09 05:32 AM
bomanfishwow
6 1,474

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