Neutron Definition and 770 Threads

There is a good review article on inelastic neutron scattering experiments and results on hole-doped cuprate superconductors. One of the authors (Tranquada) was the first person to report experimentally on the possible existence of the stripe phase in such a compound using the same technique...

taking a set of questions and came across this one: "Capture of a neutron by nickel-60 produces a proton and what new element or isotope ? " I thought it was copper-61 since it goes through beta decay as indicated by the proton but supposedly it is not... please help

This is one of those old-high school questions that never got answered (And the search mechanism here doesn't narrow on quotemarks)-- A neutron decays to a proton, electron, antineutrino ... But the highspeed escaping electron is a charge moving relative to (away from) the proton opposite...

Is there anything in the observable universe that weighs more? 1 teaspoon = billion tons

A neutron can decay into a proton, a positron, and a neutrino. A proton is made up of two up quarks and a down quark. A neutron is made up of one up quark and two down quarks. An up quark has a charge of +2/3, and a down quark has a charge of -1/3. Given the statements above, can someone...

Basically the steady-state diffusion equation can be written in a form \nabla^2\phi\,+\,k^2\phi\,=\,S When S = 0, this is just the Helmholtz equation - http://mathworld.wolfram.com/HelmholtzDifferentialEquation.html See also -...

In the text I use for class, the examples and derivations for functions showing the neutron flux at some point, are all about sources within infinite mediums. Now I have a probelm where I must show that neutron flux, for a point source within a finite sphere, is found by the following equation...

I am to calculate everything in a non-relativistic state: a 15MeV photon is completely absorbed in colliding with a neutron initially at rest. Determine the speed of the neutron: conservation of momentum: E=\frac{hc}{\lambda} 15MeV=\frac{1240MeV nm}{\lambda} \lambda=8.2667x10^{-5}nm...

I assume that the neutron is a particle with finite size and is <really> a single particle (that is that it does not have any further structure or components-like nucleus) and lastly it is electric nutral. I hope that these assumptions are close to the experimental observations. I am making life...

neutrons are fermions, with half spin, as such the must not occupy the same quantum state (meaning the wave functions can't overlap - atleast not with a big probability density portion of each other). so, if neutron star is in the most dense state it can get, meaning its degenerate and every...

Hello, I'm new to this forum. I was hoping someone might be able to help me understand what the constituents of a neutron are. Last month I read a book that stated that the neutron was composed of 2 'd quarks' and 1 'u quark'... while the proton is composed of 2 'u quarks' and 1 'd quark'...

I was reading about neutron stars and wonder if anyone can help me with something that puzzled me , namely what happens to the electrons in such a mass of atomic neuclii? I can only see there might be 2 possibilities .Either 1) that the electrons are expelled from the atoms during the collapse...

I understand the difference between the two main Neutron decays but, is there an observable difference when an electron collides with a neutron compared to a positron colliding with a neutron? In particular, I need to know if there is a difference in the behaviour of the neutron.

what is deffrence between nutron energy spectrum and nutron flux

Is a neutron star held together mainly by the strong force? Are they dense enough so that this is the case, or is gravity the only thing to consider? What about black holes?

Neutron fluence at the reactor pressure vessel wall a comparison of French and German procedures and strategies in PWRs U. Jendrich (GRS), N. Tricot (IRSN) Abstract: While the neutrons within the core may take part in the chain reaction, those neutrons emitted from the core are basically...

A He4 nucleus, with a mass of 4 amu moving with speed v breaks up into a neutron 1amu and a He3 nucleus 3amu . If the neutron moves in a direction perpendicular to the direction of motion of the original He4 nucleus with speed 3v, what is the speed of the He3 nucleus? if the neutron moves...

Nasa team has solved a great mystery:http://www.nasa.gov/mission_pages/swift/bursts/short_burst_oct5.html

press release from NRAO http://www.nrao.edu/pr/2005/fastpulsar/ The fastest-moving neutron star ever seen, clocked at 1100 kilometers per second, a speed that will take it out of the Milky Way galaxy, was given its initial "kick-off" by the supernova that formed it. journal article...

What are they? :confused:

Why does a neutron not decay in some nuclei? Why does it decay in other nuclei? Is there some mechanism suppressing the d quark -> u quark + W- boson channel? I'm looking for a fundamental QFT / Standard Model explanation. Thanks!

http://arxiv.org/abs/astro-ph/0506364 Title: Neutron Diffusion and Nucleosynthesis in an Inhomogeneous Big Bang Model Authors: Juan F. Lara Comments: accepted for publication in Physical Review D This article presents an original code for Big Bang Nucleosynthesis in a baryon...

I have a question about the time scale for a certain type occurance causing a neturon star to explode, and a related question about the conditions of this occurrance. If you have a binary star system with one of the stars being a neutron star, I read that if the other star sucks off enough...

quasars are highly active but extremely distant galaxies, right?what kind of galaxies are they and do they represent an earlier stage of the lives of the conventional galaxies?i've a vague idea that quasars a galaxies in which the supermassive black holes at the centres are actively gobbling up...

Are Neutron Stars the major factors of Proton Stars? :http://arxiv.org/abs/astro-ph/0506092 Why do Neutron Stars evolve from Proton Star collapse, and what is the next evolving stage?..if any? :http://arxiv.org/abs/astro-ph/0506100 Can a further collapse occur that does 'not' produce...

What does a neutron star "look" like Hi, I have some questions for a scifi story I'm working on. First, what would a neutron star look like? What color are they, and how bright do they tend to be? By look like, I mean both seen from a theortical planet surface orbiting one (or mabye it would...

Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. The density of a neutron star is roughly 10^14 times as great as that of ordinary solid matter. Suppose we represent the star as a uniform, solid, rigid sphere...

undefined what mass does a neutron star hove and what is its life span? and any other information on the subject would not go un-apiretiated

At the centre of an atomic bomb, there is a neutron sprayer, something that can produce neutron streams. What is this component? how do they work? How do we produce free neutrons on particle accelerators? Thanks

http://www.physics.ubc.ca/~heyl/ns2005/prospectus.html Neutron Stars at the Crossroads of Fundamental Physics I. Organizers Jeremy Heyl – University of British Columbia Vicky Kaspi – McGill University Feryal Özel – University of Arizona Krishna Rajagopal – Massachusetts Institute...

Where can I find PDF "Black holes White Dwars and Neutron Stars" Gents, Could u pls advise me if you know where can i find book "Black holes White Dwars and Neutron Stars" Authors Shapiro, Tuekolsky (free PDF or DJVu or other format) Thks

What are the forces that give asteroids their shapes? And what shape do neutron stars that do not rotate around its axis have?

Hey guys, I know this is basic nuclear physics but I've forgotten how to do it. Given the atomic mass of Oxygen 16 (8p 8n), Oxygen 15(7n 8p) and Nitrogen 15(8n 7p), having found the average energy binding energy per nucleon (i think i have it right) find how much energy is required to remove...

one reason it's good is that it is written for the Wiley "Encyclopedia of Physics" http://arxiv.org/abs/physics/0503245 Neutron Stars Gordon Baym, Frederick K. Lamb Comments: Encyclopedia of Physics 3rd ed., R.G. Lerner and G.L. Trigg, eds., Wiley-VCH, Berlin Abstract: "This short...

Came across this forum while searching the net for help. It's great to have a forum dedicated to physics. So hi to everyone :) Now to business. I'm stuck with this question. If you weigh 660N on the earth, what would you weigh on the surface of a neutron star that has the same...

Is there a website where I can find out what isotope I have if I know it's half life and energies of the beta particles emitted?

with the use of the conservation of momentum.. Is it possible? what does it exactttly mean anyways? :bugeye:

When an atom experience beta decay, will the atom become ion? This is my deduction: 1.An atom will release an electron in beta decay. 2.The electron is replaced by the electon produced from the decay of neutron. 3.However, the proton number increase by one. It still need one more electron...

In ‘Introduction to Elementary Particles’, David Griffiths makes the following two statements: a neutron decays into a proton, an electron, and an antineutrino (1.8) And later: but the following decay is not observed an antineutrino plus a neutron decay into a proton and an electron...

A neutron at rest in the laboratory spontaneously decays into a proton, an electron, and a small essentially massless particle called a neutrino. Calculate the kinetic energy of the proton and the electron in each of the following cases: a) the neutrino has no kinetic energy b) the neutrino...

There are no neutron stars within 1000s of light years that we know of but there could be chunks of one much closer. The speculation of a planet X in our solar system has been written about many times and some think the new found planetoid Sedna may be that object.However, a much smaller object...

Question: The radius of a neutron star is 750 times smaller than the Earth's radius, and its mass is 1.8 times larger than the Earth's mass. What is the escape velocity from the surface of a neutron star? (Ignore the fact that, at high speeds, one should not really use mv^2/2 for the kinetic...

I've heard this explained numerous times, most recently in my General Relativity course today, where he talked about how smaller stars will collapse into white dwarfs, while more massive ones will overcome the electron fermi gas pressure, effectively forcing the electrons into the protons, so...

What do members think of this: http://arxiv.org/abs/astro-ph/0411163 ? Garth

Hello. I'm a little unsure of how to proceed on this problem... Here it is: A 3-Gev proton flux is monitored by measuring 24Na activity induced in 25 microm (6.85 microg/cm2) aluminum foil via 27Al(p, 3pn)24Na reaction (for 3 Gev protons, cross section = 9.1 mb). Exactly 15 hr after the end...

Einstein field equation gravitational potential: \nabla^2 \phi = 4 \pi G \left( \rho + \frac{3P}{c^2} \right) General Relativity gravitational pressure: P_e = \frac{c^2}{3} \left( \frac{\nabla^2 \phi}{4 \pi G} - \rho \right) Classical Yukawa Pressure: P_y = f^2 \frac{e^{-...

isn't a neutron more massive thatn a proton?

Question: What would it take to coax a deuterium atom to give up its neutron? In terms of input energy? Would you need to hit it with an energetic electron to have a reasonable chance of disassociation? Thanks!

If neutrons stay intact and get closer together than 10^-15 metres in a neutron star, would the exchange of mesons between neutrons stop and be replaced by the exchange of gluons, and would the gluons cause an attractive or repulsive force between neutrons? A repulsive force could stop the...

How can gravity overcome the degeneracy pressure of neutrons in a neutron star? Isn't such a thing the same as violating the uncertainty principle?