Beta Definition and 384 Threads

Homework Statement One could imagine that beta decay was due to a electron initially inside the nucleus and than leaving it. Proof by using Heisenberg uncertainty principle that this is not possible. There is a hint which says you can use energy spectra and values for the energy of beta...

Beta Function Demonstration Problem. I pushed the "Enter" key by accident and the topics name got ruined. Good Day to everyone, I have this problem, (In the context of the Gamma and Beta functions) I have to demonstrate that: Homework Statement Demonstrate that...

During beta negative decay, in an unstable isotope, a neutron is converted into a proton, electron, and antineutrino. The electron and antineutrino are ejected from the atom and the proton remains in the nucleus to become the new daughter element. For a beta negative decay reaction for some...

Homework Statement \int_1^{\infty}\frac{dx}{x^2(x-1)^{1/2}} Homework Equations \int_0^1t^{x-1}(1-t)^{y-1}\,dt \int_0^\infty\dfrac{t^{x-1}}{(1+t)^{x+y}}\,dt, The Attempt at a Solution Hi all, I have another beta function problem. This time I'm unsure how to deal with the limits, as the...

Homework Statement \int_{-2}^{2}\left(\frac{2-x}{2+x}\right)^{1/2}\hspace{1mm}dx Homework Equations B(p,q) = \int_0^{\infty}\frac{y^{p-1}}{(1+y)^{p+q}}\hspace{1mm}dy The Attempt at a Solution I am completely stuck on this one, just a total mental block. The answer in the book...

Hello I am re-reading some of my old textbooks and have come across a simplified (non-relativistic) term used to correct the beta decay spectrum for the coulomb effect of the nucleus on the ejected beta particle. The expression is; F(Z,E) = (2*Pi*n) / (1 - exp(-2*Pi*n)) where n =...

hi i'm new so i hope i am writing this in the correct part of the forums this is the question i have been given: --- What is the energy Q released when ^{131}_{\ 53}{\rm I}decays and ^{131}_{\ 54}{\rm Xe} is formed? The atomic mass of ^{131}_{\ 53}{\rm I} is 130.906118 \rm u and the...

Because electrons are known to be participants in the beta-decay reaction, electron density has been shown to influence the rate of beta decay: http://prl.aps.org/abstract/PRL/v98/i25/e252501 http://www.phys.ncku.edu.tw/mirrors/physicsfaq/ParticleAndNuclear/decay_rates.html...

I do not get the concepts of the parity change and how do I find the deta (l) for beta decay. Please Help! Classify the following decays according to their degree of forbiddenness, all ground states decays. 89Sr (5/2+) -> 89Y (1/2-) 26Al (5+) -> 26Mg (2+) 97Zr (1/2+) -> 97Nb (1/2-)...

Homework Statement The quadratic equation x^2 + kx + 2k = 0 where k is a non-zero constant, has roots \alpha and \beta. Find a quadratic equation with roots \frac{\alpha}{\beta} and \frac{\beta}{\alpha}. {one is meant to be inverted - the code isn't working properly :( } Homework...

With this mechanism a nuclear proton can capture an inner orbit electron and change to a neutron with the emisssion of a neutrino.Can this mechanism also operate with free protons if ,say, bombarded by free electrons?I have tried researching this but have found no reference other than a Wiki...

Homework Statement A 14C nucleus, initially at rest, emits a beta particle. The beta particle is an electron with 127 keV of kinetic energy. A) What is the speed of the beta particle? B) What is the momentum of the beta particle? C) What is the momentum of the nucleus after it emits...

Homework Statement {}^{12}_{7}N undergoes \beta^{+} decay. i. Write the corresponding equation. ii. Calculate the decay energy, Q. Homework Equations M\left({}^{12}N\right)=12.018613u m_{e}=0.511\frac{MeV}{c^{2}} The Attempt at a Solution i. For the equation...

Homework Statement Why is the inverse Beta decay forbidden for a free proton? Homework Equations p -> n + e(+)(positron) + v (neutrino) The Attempt at a Solution Is it because, the change in the Q value must be the same for each decay?

Hi all, In Polchinski's string theory text he asserts (volume 1, section 3.4) that the trace of the energy-momentum tensor of a classically scale -invariant theory becomes proportional in the quantum theory to the beta function of the coupling, as a general point of QFT. This makes a kind of...

Whenever I try to compress files & make an Archive of them using WinRar , I am presented with 6 Compression method choices - Store , Fastest , Fast , Normal , Good & Best . Regardless of whichever Option I choose , the file or collection of files is only compressed to 98 or 99% of the original...

Beta particles are fast moving electrons emitted by the nuclei of certain atoms. When beta particles enter a material they may be deflected, and after penetrating a short distance into the material, may be moving in any direction. Some of these particles may have their motion reversed by their...

I've heard that that origin of String Theory was in Gabriele Veneziano's analysis of the Euler beta function in relation to the strong force. I was wondering if anyone could refer me to a paper or derivation describing how this function ended up describing particles as strings.

Hi, I was wondering about something in my notes that I don't quite understand. In positive beta decay in nuclear physics, we have a proton becoming a neutron and kicking out a positron and an electron neutrino (which is assumed massless here). In the expression for the energy released, Q =...

Do we know why radioactive nuclei only decay through emission of alpha and beta particles? There is spontaneous fission in some cases, of course, but what I mean to ask is, why should just a proton or just a neutron or a particle X with 2 protons and 3 neutrons, or whatever else not be emitted...

Homework Statement If you were given 4 cookies, each emitter different ray 1)Alpha, 2)Beta,3) Gamma , 4)neutron You have to make decision of the following: a)eat one of the cookies b)dispose one of the cookies at storage facility called WHIP c)put one of the cookies in your pocket...

Most accepted theories make sense, but the energies involved in the beta decay of a neutron into a proton confuses me. How can a down quark change into an up quark by emiting an electron and an anti electron neutrino via a w boson, the figures don't add up! Using the figures of mass it goes...

I was reading a text, describing the following disintegration: ^{234}_{90}Th\xrightarrow{}~^{0}_{-1}e+~^{234}_{91}Pa However, I prefer to understand it as, ^{234}_{90}Th\xrightarrow{}~e^{-}+~^{234}_{91}Pa Of course, the above two equations are missing out the antineutrino. Could someone...

Hi all, when an atom goes through a beta decay, say 32 phosphorus. The final state is then 16 protons, 16 neutrons, and 15 electrons. This seems to be an ion of sulfur. My question is, does the atom remain in a positively charged state? or does it ionize it suuroundings and captures an...

Hi all, I find difficulties in recognizing between alpha and beta Glucose. Can anybody explain briefly how can I differentiate between them ?

what is the difference between a beta particle and an electron in terms of its behaviour and physical properties like mass etc..?

I have been learning particle physics lately but it's been mostly from a theoretical perspective and not a mathematical one so I have yet to come across any such math but my curiosity is peaked. From what I understand it, this is the process: n \rightarrow p + W^{-} Followed by...

Can someone please clarify beta decay for me. As I understand it, in B- decay, a neutron turns into a proton, electron, and anti-neutrino, then the electron and anti-neutrino are ejected. But from this example, it looks like there are two additional electrons as a result of decay. 19/8 O ->...

Hi, I am not sure whether this falls into a math category or here, I hope you can help me. I came across a problem in a book [bare with me, please] (Fundamentals of engineering electromagnetics by Cheng) and asked my electromagnetics profesor, but his response did not help me into getting to the...

Hello everyone, Newbie here. I am student/enthusiast of science but tend to stay away from physics. This excerpt is written by creationist John Woodmorappe concerning accelerated nuclear decay done in the lab, and I was wondering if there was anyone here would like to critique it. I'm not...

I'm trying to understand the energy spectrum of neutrinos ejected from the sun. Any suggestions on a book that covers this aspect of beta+ decay? I'm just not sure how to treat the kinematics of a fusion reaction or decay- only collisions. Thanks.

The beta function for QED is given by: \beta=\frac{e^3}{16 \pi^2}*\frac{4}{3}*(Q_i)^2 where (Q_i)^2 represents the sum of the squares of the charges of all Dirac fields. For one generation, for the charge squared you have (2/3)^2 for the up quark, (-1/3)^2 for the down quark, but this is all...

Hi there! The experiment: I'm counting Gamma and beta rays emitted from gamma and beta cylindrical sources, for counting I'm using a simple GM counter, which has nearly the same cylindrical shape (i mean diameter). As we all know this are electromagnetic emissions, so they distance must...

In beta decay, positron emission, how come the condition for decay is: M_p > M_d + 2m_e Thats: atomic mass of parent > "daughter + twice the mass of an electron. I'm sure there is some simple way of showing it, but I can't seem to find it! Also, is the most stable isobar on an atomic...

Homework Statement There are three different reactions we did in class. B-: 6C14 --> 7N14 + e- B+: 6C11 --> 5B11 + e+ Nuclear rxn: alpha particle + 7N14 --> 8O17 + e+ Homework Equations Q tot = (mass inital - mass final) * 931.5 MeV Charge balance The Attempt at a Solution In...

I understand that a beta plus decay emits positron and beta minus decay emits electron. For the calculation of kinetic energy of the particle released, you take into account the mass of electron for beta plus, but why is it that you DON'T take into account the mass of electron for beta minus? I...

How does one integrate \int_0^\infty e^{-\beta x^2}\cos{(bx)} dx for positive beta and real b ? I was thinking maybe differentiation under the integral sign would do the trick, but I can't get anywhere.

Homework Statement \int_{0}^{3}\sqrt[3]{\frac{3-x}{x^2}}\: \mathrm{d}x 2. The attempt at a solution I'm pretty sure I have to use Euler's Beta function, so I tried to change the limits to 0 and 1 by setting x = 3·u (so dx = 3·du). However there must be some mistake when I did it because I...

We have a surface that is 10 cm x 10 cm. That surface is uniformly covered with a radioactive material. When radioactive material decays, it has a equal probability of emitting radioactive particles, in this case beta particles, in any direction (360 degrees). We have a detector that...

I am researching Turkish cymbal making technology and I discovered and learned that they made in beta phase. Beta phase comes within % 23 to % 25 tin ratio and 625 to 780 - not exactly , you must look to diagram - degrees heat. I found few phase diagrams and it seems to me there is only one...

I understand the physical changes in beta decay that eventually lead to the virtual particle, a W- boson being formed. However I do not understand the physical changes that take place, which eventually lead to an antineutrino being emitted. What changes take place in the W- boson, that make it...

Homework Statement Let A, B,be two non empty sets of real numbers with supremums 'alpha' and 'beta' respectively, and let the sets A+B and AB be defined by: A+B={a+b / a belongs to A, b belongs to B}, AB= {ab / a belongs to A, b belongs to B}. Show that alpha+beta is a supremum of A+B...

In my A-level Physics course we have been talking about nuclear decay. When an nucleus decays by beta emission the proton number increases. My teacher described a neutron as "an electron and a proton" so that the overall charge is 0. To me this sounds like a simplification. what's really going...

Here is a beta decay related question: Masses are from Particle Data Group (http://pdg.lbl.gov/2008/listings/contents_listings.html) Neutron has udd quarks. Mass is approximately 2.5, 5, 5 MeV. Total 12.5 MeV Products are: 1. Proton. uud quarks. Mass approx 2.5, 2.5, 5 MeV 2. Electron...

This sounds like a silly question but if Z (atomic number) is defined as the number of protons in a nucleus. Why does Z=-1 for a beta minus particle? (since it is just an electron) I know what is happening with the decay that a up quark turns into a down quark so that a neutron turns...

My first post - Hi everyone. I've been reading about boson mass and speed for a couple of hours but I can't seem to find answers. - What is the speed of the W boson during beta decay? If it has a huge mass shouldn't it be a lot slower than leptons? - I assume the electron and...

Exponential Attenuation and Beta Particle Range (solved) Homework Statement I am given a beta emitter and its atomic mass, as well as the atomic mass of its daughter, which have a difference of 0.0034 amu. I am to determine the range of the particles in air. Homework Equations I am given...

Hello! I've been quite puzzled by this question and its solution. Explain why beta-particles penetrate through matter more easily compared with alpha-particles having the same KE? The answer given goes: The mass of beta-particles are much smaller than those of alpha-particles, hence the...

I am designing an experiment to investigate how the number of beta particles scattered backwards depends on the thickness of a foil and the proton number of the foil material.I have decided on the source Sr-90 for beta emissions.i know what to do to. I will have the beta particles fired at the...

Homework Statement The actual question I'm working on is to find the Method of moments for \theta for a beta distribution where the parameters are m = n= \theta Homework Equations What I need help with is to get started, I know that E(X)=1/2 for this question so that it does not...