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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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God particle is 'found': Scientists at Cern expected to announce on Wednesday Higgs boson particle has been discovered...
Jul11-12 01:13 AM
tom.stoer
178 34,435
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 21,056
the idea is let us supppose we have a well behaved theory where only logarithmic divergences of the form ...
Aug15-09 11:31 AM
genneth
1 759
I'm trying to understand the energy spectrum of neutrinos ejected from the sun. Any suggestions on a book that covers...
Aug12-09 01:11 AM
Vanadium 50
1 1,324
I understand that when , say, several protons and neutron come together to from a nucleus they loose some mass and...
Aug17-09 05:15 AM
fatra2
1 1,096
When I look at a nuclear level scheme, there are many gamma ray transitions from energy levels of say, spin 4 to spin...
Aug19-09 02:59 PM
Vanadium 50
1 1,038
I have worked out the total spin for the elements up to Neon however I hit a snag with Nitrogen and Fluorine. The...
Sep4-09 09:59 PM
PeterDonis
1 896
I have a question about the nature of matter on earth, the most stable form of hadrons which exist on earth are made...
Sep1-09 12:43 AM
Vanadium 50
1 903
When writing a reactivity in dollars, what is the proper notation? Would it be 0.43$ or $0.43? or is it just 0.43?...
Sep10-09 03:20 PM
Astronuc
1 2,979
I have been learning particle physics lately but it's been mostly from a theoretical perspective and not a...
Sep11-09 07:01 AM
Astronuc
1 8,637
If an nuclide can be fissioned by thermal neutrons does that always mean it can be fissioned by fast neutrons. If not...
Sep13-09 05:14 PM
Astronuc
1 3,711
How is fusion initiated with a laser? What are the difficulties that are preventing physicists from using it?
Sep14-09 10:11 AM
Bob S
1 911
Is anyone here familiar (more or less) with the new type of telescope called IACT, Imaging Air Cherenkov Telescope. ...
Sep16-09 12:59 AM
Vanadium 50
1 730
I can't find the value of the Yukawa coupling g, for neutron-proton scattering for example, where the Yukawa potential...
Sep20-09 05:47 PM
clem
1 2,616
Quark physics is completely out of my depths but I was wondering if, in a nucleon, they assume certain orbitals like...
Sep21-09 08:31 AM
clem
1 882
When it is said that the relative strength of weak interaction is \ 10^{-5},what does this mean? On calculation I...
Sep22-09 04:36 PM
hamster143
1 3,620
Hi everyone! Can somebody briefly explain me what the GIM Mechanism (Glashow, Iliopoulos, and Maiani) is and why does...
Sep24-09 10:57 AM
humanino
1 4,277
The Higgs particle is said to be required for mass. Does this mass in this case mean inertia? Surely all that is...
Sep26-09 06:51 AM
krishna mohan
1 1,174
Where does most of the heat energy in fission reactions come from? -Does it come from radiation emitted from...
Sep28-09 10:18 AM
QuantumPion
1 1,060
Hi I have a question about Lorentz invariant measures, consider an integral of the form: \int d\mu(p)...
Nov12-09 04:19 PM
hamster143
1 2,725
Is there a defined distance at which Electromagnetism starts exerting more force than the strong nuclear force? So...
Oct6-09 11:40 AM
Meir Achuz
1 969
I'm trying to calculate the pauli-lubanski pseudo vector for different representations of the poincare group. The...
Oct6-09 08:11 PM
Wriju
1 2,225
Hi, I am trying to understand relations between Homology/CoHomology and Homotopy group..I am familiar with Hurewicz...
Oct7-09 11:04 PM
Haelfix
1 1,093
what is the difference between a beta particle and an electron in terms of its behaviour and pysical properties like...
Oct9-09 10:26 AM
Bob_for_short
1 910
Hi, I am having much trouble on this particular question. Here it is: Four “point” gamma ray sources are...
Oct10-09 01:00 PM
Astronuc
1 2,850
An American physicist is investigating the possibilities of the development of a hyperdrive at the LHC. If you're not...
Oct11-09 10:28 PM
vanesch
1 792
In what relation to each other are the direction of spin vector and direction of polarisation vector.... for example...
Oct13-09 05:45 AM
Vanadium 50
1 1,659
If there are three vectors a=(1,0,0) and b=(0,1,0) what vector will be a+ib (i - is a complex) Is it possible to...
Oct12-09 04:16 PM
Phiphy
1 952
Anybody knows what is the physical meaning of hypercharge in electroweak theory?
Oct14-09 03:07 PM
Ben Niehoff
1 1,021
Where can I get reliable information on the cross section of various substances: boric acid, O2, Uranium, water, etc?
Oct16-09 10:22 PM
Bob S
1 1,226
I have a theoretical question. When doing canonical quantization, and writing the equation for he time evolution of...
Oct23-09 06:23 AM
Bob_for_short
1 805
I've been wondering ever since I read about mesons, how they can exist. Shouldn't the particle anti-particle pair...
Oct24-09 09:25 AM
Vanadium 50
1 2,595
Hello guys, I have a large amount of data... and I was wondering if there is a Time Of Flight (TOF) calculator out...
Oct27-09 12:08 PM
Bob S
1 3,870
What is an isoscalar nucleus? I guess it should be a nucleus with isospin T=0. In the place where I...
Oct27-09 07:44 AM
Vanadium 50
1 2,587
Hi, did I understand this correct: The Yukawa matrices are the couplings of the particles to the Higgs filed. They are...
Nov22-09 06:47 AM
ansgar
1 2,192
Here are two pages showing examples of the Cherenkov radiation: http://physics.syr.edu/hep/rich.html...
Nov15-09 11:38 AM
Vanadium 50
1 1,458
Can anyone walk me through this calculation? I'm not completely sure how to do it (merely a student). So is this...
Nov22-09 04:48 AM
Vanadium 50
1 732
http://cmsdoc.cern.ch/cms/performance/FirstBeam/pictures221109/CollisionEvent.png Garrett Lisi has mirrored the...
Nov23-09 04:05 PM
xepma
1 3,075
I have 2 questions... I was told that the transmutation of Li-7 to Be-8 by proton collisions at energies below the...
Nov27-09 10:50 AM
bcrowell
1 1,726
Hi i just wanted to clarify a few things to do with nuclear physics so if anyone could help me that would be great. ...
Nov30-09 10:09 AM
Astronuc
1 2,072
Hi I'm trying to do a question on nuclear decay chains. The question is: Bi-210 decays to Po-210 by beta decay...
Dec1-09 11:06 PM
Astronuc
1 4,336
What is a realistic timeline for the LHC initial experiments? ie. with a machine this massive and complicated, how...
Dec1-09 02:32 PM
Vanadium 50
1 1,490

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