Proton Definition and 813 Threads

Does this ever happen? p + \gamma \rightarrow n + e+ + \nu_e It seems possible, if the \gamma has enough energy, but I wonder if anyone can confirm that it happens.

Homework Statement Dear members, In proton proton cycle, Two protons fuse together to form a duetron with positron and nuetrino. Then duetron combine with another proton to form 2He3, which then combines with another 2He3 to give 2He4 The final reaction is 41H1+2e---> 2He4 Homework...

Homework Statement An electron and positron have mass me and separation R and are initially at rest. Find the time T it takes for them to collide. Homework Equations F=kq1q2/R2 The Attempt at a Solution My problem is that the force is not constant. Do I integrate the force then...

What accounts for the repulsion of the Electron & Proton say for instance in the hydrogen atom. The coulomb force "classically" is counteracted by the centrifugal force allowing for a stable orbit but this picture isn't correct in quantum mechanics, for a charge undergoing acceleration should...

I am not quite sure wheather this is the appropriate section. (since the question is about an experiment). I wondered about the following -when the Kamiokande-colaboration is going to release new results on proton decay bounds- since their last new bounds where in 2009 (Judging from their...

How many gluons are there in a proton? http://upload.wikimedia.org/wikipedia/commons/9/92/Quark_structure_proton.svg http://en.wikipedia.org/wiki/Proton Protons are spin-½ fermions and are composed of three quarks,[3] making them baryons (a sub-type of hadrons). The two up quarks and one...

why there is "ON" in every particle`s name?

Can the energy in the fields that make up an proton be fraction-ed into a pie chart? Don't we have quark, gluon, weak, electromagnetic field energy in a proton? Thanks for any help!

velocity of proton following a helical path?? need a bit of help Homework Statement A proton with an initial velocity given by (4.0 + 3.0 + 3.0)(105 m/s) enters a magnetic field given by (0.62 T). Describe the motion of the proton. The proton will follow a helical path with a velocity of...

I refer to the last paragraph of http://physicsworld.com/cws/article/news/46592 quote: A few hundred milliseconds later, the neutron is captured by a proton to form a deuteron Can someone please explain how a proton captures a neutron or provide links to articles describing this

http://img638.imageshack.us/img638/5747/asdfnt.jpg My workbook says that protons A & B are both more acidic than C, with the answer being A (I do get that A should be more acidic than B). [PLAIN][PLAIN]http://img52.imageshack.us/img52/9800/asdfmi.jpg I chose C though because...

Homework Statement A total of 3.22 106 electrons are placed on an initially uncharged wire of length 1.29 m. (a) What is the magnitude of the electric field a perpendicular distance of 0.396 m away from the midpoint of the wire? (b) What is the magnitude of the acceleration of a...

Is there a simple way to see how all the spin and orbital angular momentum of a protons parts (quarks and gluons) sum precisely to that of a spin 1/2 fermion? Thanks for any help!

Are the gluons that make up a proton or neutron considered virtual particles? Thanks for your help!

Homework Statement I am having trouble with a basic deflection problem - a single proton traveling through a magnetic field: v = Velocity of the proton = 6 000 000 meters per second (1/50th the speed of light, so no relativistic effects) B = magnetic field strength = 0.5 Tesla...

I don't know if this is the right place to post this but would a proton falling into a black hole experience tidal forces. If the proton is like a wave could we stretch the wave out, that is probably really bad wording. Or does the quantum of energy move all together?

I was wondering What would happen if one was to smash a High Energy Electron with a High Energy Proton let's say they both have a kinetic energy of 1 Tev.

We use oscillating electrons to communicate through space due to its charge. Can't we use protons to do the same thing since they also have charge? If yes then how come we don't, is it because they have more mass which would need more energy and thus is less efficient

Homework Statement A beam of photons, originally at rest, is accelerated horizontally between the plates of a parallel-plate capacitor, the potential difference of which is 1000 V and has a separation of 1.0 cm. The particle enters a region wher a uniform magnetic field, B=0.913T (directed out...

If you add up the g-factor for the electron, the proton and the neutron it is not exactly zero. Doesn't this calculate to a magnetic moment for every atom in the universe proportional to it's mass.

Help solving the speed for and electron, having same momentum as a proton at 0.62c?? Homework Statement A proton moves with a speed of 0.62c. Find the speed of an electron that has the same momentum. (Express the answer as the quantity of one minus a number times c.) Homework...

The quarks that make the proton are up, up and down with masses of around 2, 2 and 4 MeV/c^2 respectively. So, how come when added them together we arrive at a particle with the huge mass of about 931 MeV/c^2. The only reason I can think of to explain this mass difference is the mass...

I'm thinking about the thermodynamics of electron capture: p + e --- n + v(e) + energy (That is, proton absorbs electron to give neutron, electron neutrino and energetic photons.) This is thermodynamically disfavored given the substantial energy barrier to fusion to a neutron...

Particle Accelerator Problem, proton --> electron positron He guys, I could use some help on this problem. [PLAIN]http://img31.imageshack.us/img31/2039/physhw.jpg I got the energy of the photons: E = 2hc/lambda Energy of the electron and positron I believe are: E =...

I was hoping someone could point me in the direction of the best way to calculate the rest energy of a proton. I am a complete noob with the standard model, so please be gentle. My goal is to compare a calculation of the energy which accounts for the quark structure of the proton versus E=mc^2...

If the proton in the nucleus of, say a hydrogen atom, exerts an attractive force on an electron that is in orbit, why doesn't the electron move towards the proton? And does this have anything to do with the electric force being the centripetal force?

Homework Statement A proton of charge +e and mass mp enters a uniform magnetic field B =B\hat{i}with an initial velocity Vi = vix\hat{i}+ viy\hat{j}. Without assuming any circular motion, show that its veloc- ity v at any later time t is given by v(t) = vix\hat{i}+ viy cos(eBt/mp)\hat{j}-viy...

Homework Statement A 2.0-mm-diameter plastic bead is charged to –1.0 nC. A proton is fired at the bead from far away with a speed of 1.0 x 10^6 m/s, and it collides head-on. What is the impact speed? Homework Equations Conservation of energy: Kf + qVf= Ki + qVi Possibly U elect/ Electric...

The electromagnetic power radiated by a nonrelativistic particle with charge q moving with acceleration a is: P = \frac{q^2 a^2}{6 \pi \epsilon_0 c^3} If a proton is placed in a cyclotron with a radius of 0.500 m and a magnetic field of magnitude 0.350 T, what electromagnetic power...

I still don't understand antisymmetry and fermions. Is the proton wavefunction equal to this: |\psi_p>=\frac{1}{\sqrt{6}}\left(2|u\uparrow u\uparrow d \downarrow \rangle - |u\uparrow u\downarrow d \uparrow \rangle - |u\downarrow u\uparrow d \uparrow \rangle \right) or this...

Will black dwarfs eventually quantum tunnel into neutron stars if proton decay doesn't occur?

In MR there is the resonance condition that for a proton in a lower energy state, a photon with a frequency that matches the energy separation between states, E=hf, can transmission the proton to the higher energy state by absorbing said photon. The question then is how long does this...

Homework Statement A proton moves at a speed of 7.0 multiplied by 103 m/s as it passes through a magnetic field of 0.75 T. Find the radius of the circular path. Note that the charge carried by the proton is equal to that of the electron, but is positive. Homework Equations F=qvB Fc=mv^2/rThe...

Hello, I'm always seeing the energy of a particle being accelerated in a cyclotron expressed in MeV or GeV. How do I determine the velocity of a proton in m/s ? Thanks!

Homework Statement Im being asked what is the minimum energy requiered for the process e + p -> nutrino + nutron assumptions are: 1. Kinetic energy of proton is much lower from his rest mass, not true for the electron. 2. border line case is when nutrino energy is close to zero...

I posted an LHC question a while back but did not get a reply. I'll ask a somewhat different, simplified and more specific question. I hope I am asking the question correctly. How much inward radial force is needed to keep a proton going in a 27 km circular path at 7 Tev or a Lorentz factor...

The A level book that AS students have for the AQA course has a Feynman diagram of a proton decaying into a neutron - via a W boson, producing a beta+ and a neutrino. afaiaa, protons have a lifetime of 1033 years, so this doesn't seem a likely event. Is this just a 'fictional' event, put in the...

Homework Statement Which isomer with formula C6H12O2 has the following NMR spectrum? http://aceorganic.pearsoncmg.com/epoch-plugin/tempfiles/1869_4119.jpg [b]3. The Attempt at a Solution It's hard (and probably unhelpful) to list all the tries I've had at this.

Hi, i have the following exercise: At the HERA acceleratro of DESY in Hamburg electrons and protons were accelerated to E_e=27.5 GeV and E_p = 920GeV and brought to collision. A)How large is the reaction energy in the centre-of-mass system? B) What is the velocity of the HERA...

1. A) A proton with kinetic energy of 4.95 × 106 eV is fired perpendicular to the face of a large plate that has a uniform charge density of σ = +8.10 μC/m2. What is the magnitude of the force on the proton? B) How much work must the electric field do on the proton to bring it to rest...

I know that energy is equivalent to mass and that a proton is many times more massive than an electron and yet the charges are equal in magnitude in both. How is it the electron is able to match the protons charge with so much less mass? What is it about its configuration that enables it to...

I've read that the mass of a proton has been calculated using QCD. But I assume some measured values are inputs to this calculation? If so can anyone provide a list of all of the values used (speed of light, Plank's constant, mass of other particles?)

Very quick question here that's bugging me. I go to the LHC and send a proton around at 0.999999991c. After 5 seconds of that speed I stop it and take it out. Has the proton become younger or older, by x years, than when it was put in? Thanks!

When you imagine a proton in a certain place during an experiment and expect it to be everywhere else where does the proton appear?

According to fermilab link http://www.fnal.gov/pub/inquiring/questions/antimatter1.html Proton antiproton annihilation at rest releases 1.8 GeV energy, but compare this to annihilation at 2 GeV...

So if the total energy of a particle is E2 = m2c4 + c2p2 what about a charged particle, when you annihilate it you also destroy its electric field, so you get the field energy by collapsing it. how does this factor in?

I wanted to know the average total energies of an isolated hydrogen atom's electron and proton separately. I came across a lot of equations I could try to use, but I figured I'd ask to see if this information has already been approximated. Thanks

where can I get information about the excitation levels (gamma ray spectrum) of a single proton nucleus?

In the position representation, its true that we can use operators to represent the coulombic interaction between the proton and electron of a Hydrogen atom. I've never actually given any thought as to what the elements of such an operator would be (in matrix form of course). I know these...

Hi I'm looking for a good description (high-school to 1st year level) why the ratio of protons to neutrons matters for stability. Single neutrons are unstable, but in a nucleus they are stable and the more nucleons you have the greater the strong force. So why can't you have stable isotopes...