41,374 reputation
356133
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 44
visits member for 4 years, 8 months
seen 9 hours ago

Experimental nuclear and particle physicist. These days I'm teaching, but I've spent a lot of time on nucleon structure in fixed target electron scattering and neutrino oscillations using reactors and beam sources.

Been reading Zemansky & Dittman's book on thermodynamics recently. Quote: ``The concept of temperature is rich in interpretations and levels of abstraction.'' Nice.


Jul
17
comment Is double-slit experiment dependent on rate at which electrons are fired at slit?
Related: physics.stackexchange.com/q/76162
Jul
17
comment Why does noble gas electron configuration have low energy?
Note that the filling rule minimizes the energy of an entire system, not necessarily the energy of a single atom. That is, if you can considerably reduce the energy of one atom at the cost of slightly increasing the energy of another, you are still ahead of the game and the system can bond.
Jul
17
comment Fundamental question about dimensional analysis
@ChrisDrost Please see thew edit history. Concerning who wrote which parts of the answer.
Jul
17
comment How do quarks have no spatial extent?
Various related questions: physics.stackexchange.com/q/32476 physics.stackexchange.com/q/117114 physics.stackexchange.com/q/70067 physics.stackexchange.com/q/34437 I know, several of those are related to electrons, but the size issues are the same.
Jul
16
answered Physics journals that focus on expository work
Jul
16
comment Are non-atomic electrons scattered exactly like electrons in atoms?
You won't see the whole beam scattered the same way, but of course it's been observed. Where do you think the idea came from?
Jul
16
comment Diffraction pattern without a slit
Every diffraction question is answered by Huygens' principle. Learn it. Love it. Live it. (Well, for hard ones is really helps to have Fesnel's mathematical infrastructure too.)
Jul
16
comment C60 orbital calculation
Is this primarily a visualization question? Or is it a physics one? If the former then Computational Science might be a better home. Just request migration in either a flag or a comment and a moderator will get to it eventually.
Jul
15
comment Can an electron in an atom have insufficient energy to achieve an energy level, or orbital, and what happens to this electron when this occurs?
The reaction can't proceed if there is zero phase space for the final state...
Jul
15
comment Gravitational lensing experimental data
You don't find much raw (or even processed data) on the open web. Even experiments which have a mandate to make the work public (like the Sloan Digital Sky Survey) require you to dig around a little bit to find out how the data you want is labeled. And that is not a problem: the amount of work involved in getting the data (even if you have to email a colleague and ask for it) is tiny compared to the work involved in analyzing it. People here have told you what to look for, and that is all I would expect of a colleague.
Jul
15
revised Radioactive decay as pure radiation of neutrinos and antineutrinos?
added 282 characters in body
Jul
15
comment Why the absolute temperature used in radiation equation of Stefan Boltzmann law ?
And they'd involve various powers of $273.15$ as well.
Jul
15
comment Matter: how much of it exists?
@glance It is worth noting that most matter creating (destroying) processes create (destroy) equal number of matter particle and anti-matter particles, which by the normal way of accounting these things is a wash. Changing the mass of systems is an exception is not generally referred to a matter creation or destruction, though that is a matter of conventional vocabulary rather than something obviously different.
Jul
15
comment Gravitational lensing experimental data
There are a number of observation using the sun as $M$ during eclipses, and you could compare the overall MACHO data set with some assumptions about the distribution of impact parameters and angular velocities (I doubt thee is much statistical significance in a single MACHO event, but there are a lot of them).
Jul
15
comment Kinetic Theory of Liquids
In addition to @Jon's nice suggestion one might compare the thermal energy of the particles to escape energy from the edge of the bulk (i.e. energy needed to overcome surface tension, which results from those same inter-atomic forces Jon was talking about). But I am not aware of any spherical-cow models that work well with liquids the was traditional kinetic theory works for dilute gasses.
Jul
15
answered Radioactive decay as pure radiation of neutrinos and antineutrinos?
Jul
15
comment Pure hydrogen star
Even population III stars should have about 25% helium and a tiny admixture of light metals owing to big bang nucleosynthesis.
Jul
15
comment Fundamental question about dimensional analysis
@pentane If you feel strongly about it, why not take it to meta so that we can see how the user base feels about it? Ass aside the delete un-delete was a test when I noticed that I had been assume that I couldn't delete the answer because of the accept (which is the usual case) but had been ignoring my moderator status (which ought to empower me to delete anything).
Jul
15
comment Fundamental question about dimensional analysis
@pentane Generally yes, but as Jubilee has not returned it seems that this answer is going to remain accepted unless I wield moderator powers to delete it completely. I'd have done that if alancalcitti had written an answer based on the paper.
Jul
14
revised Fundamental question about dimensional analysis
added 218 characters in body