Proton Definition and 836 Threads

If I look at the lower limits on the proton decay lifetime \tau set by, say, Super-Kamiokande, I'll see different lower limits depending on what the proton could decay into, eg. \tau_{min}(p \rightarrow K^{+} \overline{\nu}) < \tau_{min}(p \rightarrow \mu^{+} \pi^{0}) < \tau_{min}(p \rightarrow...

Homework Statement A proton is accelerated to an energy 5Mev in a cyclotron with AC pd of 1KV and the frequency of 8MHz applied to dees. Calculate the number of times proton would have to pass the dees to reach the energy 5MeV? Homework Equations F=BQV=MV^2/r The Attempt at a Solution...

Homework Statement So my teacher set us half term homework and one of the questions was state the relative size of a proton a neutron and an electron Homework Equations Not sure about equations The Attempt at a Solution Im a bit confused because everyone in my class got Proton: 1 Neutron: 1...

Homework Statement For a model of a proton's charge distribution, : [/B] I have to find the constant of normalisation for rho. Homework EquationsThe Attempt at a Solution [/B] I wrote p(r)=p_0 * (e^-r/R)/r I then wrote it as p_0^2 * integral from -infinity to +infinity of (e^-(r/)^2)/r^2 =...

Homework Statement A photon beam is incident on a proton target (at rest). Particle X (and nothing else) with rest mass M=1.232GeV/c2 is then produced. Use m_p =0.938GeV/c2 as the proton mass. a) What is the energy of the photon beam, in terms of GeV? b) What is the momentum of the moving...

If an event has probability occurring say 1/100000000000000000000000000000000 times.. if you do the experiment 100000000000000000000000000000000 times.. you are supposed to get the hit at least once? This is the proton decay experiment.. it's more than the above probability figure.. but if you...

Hi, To my knowledge about BSM (which is not much), all of them require or predict proton decay. Do you know of some of them which do not? Thanks, Ohad

I want to know what is the source of electron and proton get their charge ?

Homework Statement An electron that has a velocity with x component 2.1 × 106 m/s and y component 3.1 × 106 m/s moves through a uniform magnetic field with x component 0.035 T and y component -0.16 T. (a) Find the magnitude of the magnetic force on the electron. (b) Repeat your calculation for...

Why does everyone assume that particles decay is an ergodic random process? After all T is not a symmetry of the Standard Model and I don't see any reason why ensamble averages should be equal to time averages.

Essentially what would it take to create a man-made neutron ballast/balloon (free neutrons under pressure contained in a vessel ) Essentially a pure neutron star on a small scale. In larger scale during a stars collapse protons and electrons essentially are forced to occupy the same space acting...

Question, let's say I'm in space and I have acces to fast nuclear reactor and a lot of Liquid Oxygen, could I convert a decent portion of the neutron into Protons using Oxygen 16 Neutron activation? How effective would it be? I found the following document on Oxygen neutron activation...

When protons, due to their electric charge, interact with photons are the quarks somehow also involved in this same electric interaction? After all, the quarks do have fractional electric charges. Thanks in advance.

1.e problem statement, all variables and given/known data Two positrons and two protons are kept on the four corners of a square of side a. Positrons are kept at vertices A and C and protons are kept at B and D. let q denote the charge on both positron as well as the proton. So what is the...

Hello, For a given excitation energy, why a nucleus "choose" to evaporate preferentially a neutron or a proton? I mean, let us take for example the isotope 208Pb. Its neutron separation energy is 7367.87 keV while its proton separation energy is 8004 keV. If this isotope has an excitation energy...

How Carbon-14 effectively gains a proton but no electrons when decaying to Nitrogen-14...?

Is it right to say that 'modern physics has no deep explanation of the nature of charge' in electrons and protons?

Hi, Does an Atom's Type have to do with the number of protons and neutrons it has? Or are they completely unrelated? Just curious. Thanks :)

Homework Statement In a fixed target experiment a particle of mass M and kinetic energy T strikes a stationary particle of mass M. By evaluating s, t and u in the laboratory frame and using the above relation, or otherwise, show that the kinetic energy T' of the particle scattered elastically...

Homework Statement A proton moves through a uniform magnetic field given by = (10−25.3(j-hat) + 30(k-hat))mT. At time t1, the proton has a velocity given by = vx + vy(j-hat)+ (2.0 km/s)(k-hat) and the magnetic force on the proton is B = (4.46 ✕ 10−17 N) + (1.76 ✕ 10−17 N)(j-hat). At this...

Homework Statement A proton is in a place where the electric potential is V, and as a result it has a potential energy E. If you replace the proton with an alpha particle (twice the charge of the proton and four times the mass) in the same place, it will experience an electric potential...

Homework Statement What will be the final velocity of a proton (when it is very far away) if it it released from rest at the center of a uniformly charged hoop and given a slight push in one direction. assume it follows the axis of the hoop. mass of proton: m = 1.67x10-27 kg charge of proton: q...

Mentor note: Thread got moved to the homework section How close can two protons get if one is at rest and the other has a kinetic energy equal to the average energy at T =107 K? I know that the kinetic energy of the moving proton is 3/2kT, but what is the kinetic energy of the proton at rest...

Homework Statement A proton is moving at speed v from infinity toward a second stationary proton, as shown below. Determine the minimal distance between them. http://s27.postimg.org/lmw3d21j7/Untitled.png Homework Equations W = \frac{kq_1q_2}{r} E_k = \frac{mv^2}{2} The Attempt at a...

Homework Statement Homework Equations The Attempt at a Solution

In the CODATA table of physical constants, there are very precise numbers given for mass of electron and mass of proton. And an even more precise number for proton electron mass ratio. But when you divide the mass of proton by the mass of electron, you don't get the same number as the proton...

Hi all, I'm new to the forum so I hope this is the right place to pose this question. I've managed to find answers to nearly all of the questions I've had regarding certain aspects of physics on the forums, but haven't seen this addressed anywhere. According to Wikipedia (...

Dear PF Forum, Just out of curiosity. What happens when an anti proton hits a 'normal' neutron? According to this: https://en.wikipedia.org/wiki/Proton https://en.wikipedia.org/wiki/Neutron A proton has 2 up quarks, 1 down quark A neutron has 1 up quark, 2 down quarks. 1. Does anti proton has 2...

The book I'm reading is discussing the physics of semiconductors. I'm having a hard time understanding a passage in section introducing n-type semiconductors. (Phosphorus is used as the impurity) The book says: "At normal operating temperatures, this extra electron breaks its bond with the...

Well I'm in grade 11 and for an investigation I decided I'd observe the behavior of protons once the neutrons and electrons are removed from the atom. Specifically I want to observe how the acceleration at which the protons move apart from each other varies with the mass of the atom (i.e. #...

Homework Statement 1.0 mA proton beam accelerated through potential difference of 1 keV. Determine the volume charge density of the beam after acceleration assuming uniform current distribution within diameter of 5mm, with zero current outside of this. Particle starting from rest. Final answer...

Hello Forum members, I am very interested in pursuing a degree in Medical Physics and I have found the field of proton therapy to be quite interesting. I have been looking at various CAMPEP accredited programs to see which ones have strong proton therapy research faculty members and facilities...

1. Imagine a universe where electrons and protons have positive and negative electric charges, respectively. Could an atom consisting of one electron and one proton exist in this universe?2. None.3. My first thought was that such an universe already exists (ours) since an atom with a negatively...

Imagine a universe where electrons and protons have positive and negative electric charges, respectively. Could an atom consisting of one electron and one proton exist in this universe?

Homework Statement Homework Equations Principle of conservation of momentum, Σpi=Σpf The Attempt at a Solution Since the nucleus is stationary, initial momentum is zero. Unified atomic mass constant, a.m.u = 1.66 x 10^-27 Mass of the new nucleus: (A-4) x a.m.u Mass of proton: 4 x a.m.u 0=...

Homework Statement A high energy photon moving to the right strikes a proton that is moving to the right at a speed u/c= 0.40 in the laboratory frame, creating a proton and a neutron: γ + p → p + n For the purposes of this question, assume that protons and neutrons have an equal mass m. a) What...

Homework Statement So I'm trying to find the final velocity of a proton that is being accelerated by a particle accelerator, just before it collides with a particle. All I have is its kinetic energy just before collision: 4.7066×10^(-13) J. I thought I should use KE = 1/2 mv^2 but then...

Founding this : http://arxiv.org/abs/1502.05314 if I understood correctly the radius of the proton is smaller using muons instead of electrons. Could this be due to the fact that the gravitation force becomes repulsive at small distances so that the particles are kind of compressed by it ? I...

Hi dears,i have a question about atom,in classic physics ,(Bohr theory) when a electron swing away a proton it have not radiates magnetic waves because if electron radiates magnetic wave it will drop on proton ,and atom will be Unstable! my question is ,in quantum mechanics that uses orbitals...

Quarks join up with other quarks to form composite particles like protons and neutrons, but in the center of something like a nucleus, how do they know which quarks are in THEIR proton or neutron? When all the quarks are together and it becomes a "soup" of quarks, why doesn't it form things like...

Homework Statement Suppose a hollow metal shell (outer radius 25.3 cm, inner radius 5.2 cm) carries charge Q = -7.99 pC. There is a tiny hole in the sphere, so small that it does not affect the charge distribution or the electric field created by the charge. An proton is released from rest at...

The answer according to my booklet is 1.6734×10-24 (g), but I don't understand how we got this answer. proton: 1.6725×10-24 neutron: 1.6748×10-24 electron: 0.0009×10-24 To get the mass, I added protons with neutrons, but I got 3.3473×10-24. What am I doing wrong?

Hi, I am new here. I am just reading over my notes for stable and unstable nuclei and I came across this sentence: 'Large nuclei require a higher neutron proton ratio as this adds more nuclear attraction without adding repulsion'. I was wondering why the large ratio would reduce repulsion? Thank...

What is so special about the Higgs field that causes protons to decay?

Hello there, I'm starting S382 astrophysics with the OU. The course book says "The proton-proton chain converts four hydrogen nuclei (protons) into a ^4_2He nucleus, two positrons that quickly collide with electrons and are annihilated, and two neutrinos. Hence, branch I of the p-p chain may be...

How much force (<10kN) is needed to compress two protons into each other? When it happens, when they are annihilated, the energy of the released gamma rays E=Mp *c^2 ? or some are carried away by short-lived byproducts? Regards Karoly

Why do all wakefield accelerators seem to use either electrons or positrons? Is there any reason you would have difficulty creating a laser driven proton plasma wakefield accelerator? (that is, in comparison to an electron accelerator) Thanks.

How do protons oscillate? Do they move back and forth with a constant velocity, or sort of like a mass on a spring? If so, what is the frequency of oscillation? Thanks

I'm trying to calculate the SU(5) model's prediction for the lower limit of a proton decay lifetime, for the channel p \rightarrow \pi^{0} e^{+}. I'm following this paper: arXiv:hep-ph/0504276v1 It contains the following equation: As far as I can tell this actually contains a prediction...

I have some confusion over some diagrams involved in proton decays in SU(5). I've seen a few like this that look weird to me. Here is one I found where the colored Higgs triplet does the job: Straight away I don't know what to make of this because I've only ever seen diagrams where fermions are...