Beta Definition and 384 Threads

Beta decay, quantum fluctuations, even random vacuum polarizations are all manifestation of collapse, isn't it? The arguments being that in pure unitary wave function, there will be no phase randomization of any kind. Do you consider beta decay as example of decoherence? For decoherence to...

Hi everyone, I have another (probably too) simple question for particle physicists on this forum, but I often realize that my understanding of QFT is still rather poor. Do you know where I can find the electroweak beta function explicitly written down (at one-loop, of course)? I would like to...

In my circuits/active devices course we had to make amplifier designs with various type of transistors (BJT, JFET, MOSFET). In each design the transistor beta parameter played an important role in deciding which resistors to use in the final amplifier circuit. This beta parameter changes widely...

I am familiar with the proton:neutron ratio and stability but what about this instability actually causes a quark to emit a boson and change flavour? And what does this have to do with the weak nuclear force? Thanks

Homework Statement There is a radioactive source plaed in front of the GM counter to predict the kind of radiation emmitted by the source. 1 : When the GM counter moves 5 cm away from the source, the count rate drops significantly. 2 : When a 5mm aluminium sheet is inserted...

Why is the Emax of beta energies larger than Q? This should violate energy conservation, unless the differences in binding energies themselves are only averaged values. What I'm actually asking, is why is Q = E_average of emitted particles? At least, according to this page...

Hello, over the past few days I've been looking at glowing ionization tubes on YouTube. there seems to be this innate correlation and association between ionization chambers and noble gasses, like xenon, argon and neon. i was wondering is it possible for oxygen or nitrogen to glow like them ...

Homework Statement Using the special relativity formulae p = mv / [1 - (v/c)2] E2 = p2c2 + m2c4 derive linear relations between: (i) momentum and mass; (ii) energy and mass; (iii) energy and momentum, which involve only c, c2, β = v/c, and γ (= 1/sqrt(1 - β2)) The attempt at a solution I am...

<< Thread moved to the HH forums from the technical engineering forums, so no HH Template is shown >>[/color] The model: The goal: 1. Create a three phase voltage 2. Do a alpha-beta transformation 3. Do a Cartesian to Polar transformation 4 Check the output angle The expected result: Since...

Energy of beta ray and neutrino is equal Q=M(mass) of nucleous before-M of nucleous after,so it about 1Mev.But the mass of W boson is 80 MeV,so the least energy of electron and neutrino must be 80 MeV. Why there is the difference?Why does it seem that energy were not conservation?

Hello fellas! Ok, so we have the isotope Nickel-58 which can decay (still theoritically) to Iron-58 through double beta decay plus (bb+), my question is... imagine this decay is actually demonstrated (just figure it), so the transmutation into the iron isotope actually works... would the ejected...

Homework Statement 1) Calculate the Q-value for the electron emission beta decay of Co-60 * 2) Calculate the Q-value for the positron emission beta decay of Mg-23 * * (both correct to 6 significant figures) Atomic Masses (u) electron = 0.0005485803 Co-60 = 59.9338222 Ni-60 = 59.9307906...

In section 19.5 of Peskin it is stated that if a scale transformation ##\varphi \rightarrow e^{-\sigma}\varphi(xe^{-\sigma})## is a symmetry of a theory then there is a current ##D^{\mu} = \Theta^{\mu\nu}x_{\nu}## (here ##\Theta^{\mu\nu}## is the Bellifante energy-momentum tensor) with...

Why is the central electrode in a Geiger-Muller tube always positive (and not negative)? Many thanks!

Homework Statement Consider; p+p \rightarrow d + e^+ + \nu_e Assume the binding energy of deuteron is 2.2MeV, calculate the maximum energy that the positron can have. Homework Equations m_p=938.28MeV/c^2 m_n=939.566MeV/c^2 m_d=1875.6MeV/c^2 The Attempt at a Solution Assuming the neutrino was...

I'm doing high school physics and if a question says something like: A radioactive source gives count rate of 110 counts per second Can you say that the ACTIVITY is also 110 bq? My second question is how would a gieger counter detect gamma radiation? It is the least ionising of all three...

Homework Statement If we have a beta + deca: $$^{22}_{11}Na(3^+)\rightarrow ^{22}_{10}Ne(2^+)+ e^+ +\nu $$ with $t_{1/2}=2.6 years$, what is the energy balance at this decay, if you know that $^{22}_{10}Ne(2^+)$ is an excited state of $^{22}_{10}Ne$ with $1.25 MeV$ larger energy. Homework...

Homework Statement Homework Equations See below. The Attempt at a Solution We have β+ decay ##X_{Z}^{A} \rightarrow Y_{Z-1}^{A}+ e^{+}+\upsilon _{e}## which leads to the mass condition ##M(A,Z)>m(A,Z-1)+2m_{e}##. We have electron capture ##X_{Z}^{A} + e^{-}\rightarrow Y_{Z-1}^{A}+ \upsilon...

Could anyone explain in laymen terms what really the beta function does as said in Beta Function:https://en.wikipedia.org/wiki/Beta_function .I know that gamma function is used to find the factorial of real numbers but when it comes to beta function I can't get what really beta function does.I...

For β- we have: ##M(A,Z)>M(A,Z+1) + m_{e} - m_{e}## An electron is removed from the atom and therefore we need to take that away from the M(A,Z+1) term But for β+ we have been given: ##M(A,Z)>M(A,Z+1) + m_{e} + m_{e}## What is this saying? A positron is emitted, therefore shouldn't we minus...

Hello, I was wondering if someone could explain to me what does it meant that a beta particle has a range of energies ? Thanks

Homework Statement Consider a sample of size 5 from a uniform random distribution (0,1) . Computer the probability that the median is in the interval (1/4, 3/4). [/B]Homework Equations I guess... The Pdf of beta is and median is...I'm not sure...I would guess 1/2?[/B]The Attempt at a...

We consider the following beta decay: ^A_ZX \rightarrow ^A_{Z+1} Y + e^{-} + \nu_e The Fermi golden rule is given by: \Gamma = \frac{2\pi}{\hbar} |A_{fi}|^2 \frac{dN}{dE_f} Reaction amplitude is given by ##A_{fi} = G_F M_{nucl} ## while density of states is given by ##dN = \frac{4 \pi...

I heard that one of Euler's Beta/Gamma function identities models the strong force. I was just wondering how it did this. (This might be a stupid question) How do we measure the strong force, and how is it a function of two variables?

Homework Statement The ##B^+## meson decays through the weak interaction. One of its decay channels is . If a ##B^+## is traveling with a total energy of 9.90 GeV, calculate the range of possible energies the produced may have. (i.e. determine the minimum and maximum values of its energy.)...

Hello, I've recently started studying Nuclear physics and would appreciate help from someone who could clarify my doubt. Given Problem: 19O -> 19F + e + v Calculate the Q-value in the given decay using following data: Atomic masses: 19O 19.003576u 19F 18.998403u The problem that I'm having...

Hi, I'm just trying to get my head around beta decay and would appreciate it if someone could correct me if I'm wrong. Beta minus decay involves the transformation of a neutron into a proton, electron and electron antineutrino. This is all mediated by the weak nuclear force and involves W and Z...

Homework Statement Use the periodic table to find the daughter nucleus after a gold nucleus (Au) undergoes beta decay. What would be the result if the gold nucleus had undergone alpha decay instead? Homework EquationsThe Attempt at a Solution Beta Decay: A=196.96655 Z=80 Au Alpha Decay...

Homework Statement If ##X_1,..,X_n## is a random sample and has a density ##f_X(x)=6x(1-x)## for ##0<x<1##. Let ##X_{(1)}=\min(X_1,..,X_n)##. Find the ##E(X_{(1)})## (Expected Value)? Homework Equations There is an uploaded picture of the pdf I used. The Attempt at a Solution "I've been...

I've started studying physics at a basic level and I've ready that beta decay takes place when the number of neutrons exceed the number of protons in a nucleus. Why does this excess number of neutrons compared to protons make the nucleus unstable? Also, what does an unstable nucleus mean?

Homework Statement from the physics fact in the photo, i know that the daughter nucleus is a positive ion... but , referring to the part 2 , finding the mass loss in beta decay in terms of atomic mass , it says that A_(z+1) Y has extra one orbitting electron comapred to the parent nucleus. this...

Hi everyone I have a question and that question is" are alpha and beta and also gamma rays behavior is similar to a wave ?" For example if we set up an experiment as same as Young's interference experiment, are these rays acting as same as light in this experiment. Thanks

If I want to take the wedge product of $$\alpha = a_i\theta^i $$ and $$\beta = b_j\theta^j$$ I get after applying antisymmetrization,$$ \alpha \Lambda \beta = \frac{1}{2}(a_ib_j - a_jb_i)\theta^i\theta^j$$ My question is it seems to me that antisymmetrization technique doesn't apply to the...

Homework Statement in the first photo of my note , it says that the product nucleus has Z electrons[FONT=Verdana] (not Z+1) electrons , whereas for the 2nd part of my note , it says that the atomic masses of the product nucleus( which has A nucelon mumber and Z+1 proton number) , it has one...

If I have a scalar field $$\alpha$$ and a Dirac particle $$\beta$$ and its anti particle $$\overline{\beta}$$ such that the three couple to give a vertex factor of $$-ik$$ when evaluating the Feynman diagram (where k is an arbitrary constant). How do I evaluate the first order diagram of...

Interestingly, I seem to have an integral I have posted before, but I want to take a different approach to it. $\int_{0}^{1} \frac{\ln(1+x)}{1+x^2} \,dx$ The beta function states, $B(x,y) = \int_{0}^{1} {t}^{x-1}({1-t}^{y-1}) \,dx$ So, I was just thinking if there a possible way to compute...

So in beta decay I know a neutron can decay into, proton, electron and antineutrino (Or, neutrino, since they're both the same?) But anyhow, regardless of the neutrino, in neutron stars electron degeneracy doesn't hold and electrons combine with photons to form neutrons. But isn't that...

Anyone able to explain Beta decay?

Hello, I am interested in computing the optimal depth of a copper absorber for Sr-90 decay electrons. I want to find a way to simulate a beta decay spectrum in C++. Have you got any idea or possible documentation on where I could start?? Thank you!

How W- boson decay into electron and anti neutrino?

I have a set of scored items with the scores in the interval [0,1]. Roughly speaking the distribution of scores is about 50% equal to 0 and then sloping steeply downward all the way toward one or near to one. I want to fit this data to a distribution and use that down the road in some...

In certain forms - including the logarithmic - a number of the trigonometric and hyperbolic functions can be used to sum series having Riemann Zeta and Dirichlet Beta functions (in the general series term). In this tutorial, we explore some of these connections, and present a variety of Zeta and...

Hi all, I am currently trying to calculate the beta function for scalar QCD theory (one loop for general su(n)). I therefore need to calculate the Feynman rules in order to apply them to the one loop diagrams. Unfortunately I am getting very confused with what the Lagrangian for scalar QCD...

Homework Statement The open loop response A(jw) of particular op-amp is measured and is shown. The top figure shows magnitude plot of A(jw) in dB and the bottom figure shows the phase plot of A(jw). Determine the value of β in order to have a stable feedback amplifier? Homework...

Hi, i am new here. Thought it would be good to sign up as i have just started hitting the books in preparation for my AS Level exams. So this is my first question. I think i may have done this question correctly, but i was just seeing what other people think as i am not 100% sure about it...

In beta decay, is the W boson created by the change of a quark or does it cause the change? Also, I don't fully understand where the W bosons come from or how they are created. If someone could please explain this to me, I'm very confused.

Thank you for any help that you can offer. Did I answer the questions? Homework Statement What is the minimum value of Beta which would cause a source? current source? https://scontent-a.xx.fbcdn.net/hphotos-prn1/t1.0-9/1959374_10151945917195919_465523700_n.jpg Homework Equations Beta =...

Guys can you please tell me how fast/slow Alfven waves propogate in High/Low Beta Plasma? I need to derive equation cannot find any clue on that! Please be so kind to help me please!:rolleyes:

I've read about why it would be nearly impossible for an individual to construct a working home built nuclear reactor (of any variety), but I've never understood why a home built nuclear battery couldn't be constructed (think Henry Moseley's work). The size and power output would be impractical...

I know lead is a great shield against gamma particles due to its extraordinary density, but I wonder if it can also block beta particles, or is it transparent to them due to being electrically conductive? Thanks ahead of time for your responses!