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.

7h
comment Protons and Neutrons Overshoot Actual Mass?
@userLTK's comment is bang on: binding energy represents the energy needed to get the pieces apart again.
8h
comment Protons and Neutrons Overshoot Actual Mass?
Your math is telling you exactly what you expect: that the carbon nucleus is a bound system.
9h
comment Did Pope John Paul II perform a miracle?
Even with references, would this add anything to the existing answer?
11h
comment Why do electrons, according to my textbook, exist forever?
@doc The theories that have had staggering success predicting properties of existing particles and the existence of of originally unknown particles are quite clear on the matter: the lepton number associated with a captured electron goes with the neutrino leaving zero leptons behind with the neutron. And while I'm not aware of any neutrino observations associated with electron capture we have all the other neutrino--nucleon processes. By contrast, confining an electron inside a neutron would cost more energy than is available. So no, "cold storage" is not a good alternative.
12h
comment What is precisely the energy scale of a process?
Rather than focusing on $s$ in particular it might be better to take the more general approach of looking at the mass of the exchange line of the leading diagram be it $s$, $t$, or $u$.
13h
comment If transitioning into academic position, should I buy my PhD graduation cap and gown?
My institution expects you to provide your own regalia for commencment ceremonies. As does my father-in-law's. Mind you, in both places you need only attend once a year, and it is common to borrow a robe from a colleague if your own is unavailable.
1d
comment Computer Science student with nascent interest in Physics
My first two years in college I was trying to do the preparation for both the CS and the Physics majors. At some point you'll have to chose one to be your job and the other to be a non-professional interest, but don't let that stop you from digging in: either way you end up choosing the preparatory work for the other will help you and set you aside from some of your peers.
1d
comment What is a body's momentum really equal to?
Again, outdated in the opinion of most professional users of relativity.
1d
comment What is a body's momentum really equal to?
@hft Most people who do relativity for their job dropped the relativistic mass and associated framing decades ago. Outdated is not much of an overstatement. It is true that there is some professional resistance to this change so I won't be adamant about the point, but I'd dearly like to sit every high-school science teacher in the US down and tell them to just stop already. It only confuses students as we see here.
1d
comment Formulas are flickering in the preview as I type
This has been a problem at least once before. But I thought it had been dealt with.
1d
comment How come the length of a wire does not affects on the circuit current?
The length enters two ways: in the size of the motional EMF and in the resistance of the wire. Now ask yourself how each of these things scales with length and how current scales with the resistance and EMF.
1d
comment When will physics understand it is the 'dark mass' not the 'dark matter'?
I've considered trying to get together a "What do I do if people think I'm a crank?" document on the off chance that someone out there actually has a point and it isn't getting the attention it deserves because of the originators behavior. One of the points would be 'Use the vocabulary of the discipline. The meaning of words is defined by their shared use, and trying to tell us that you have the "real" word or the "real" meaning, is invariably interpreted as a sign that you don't know the science you are trying to criticize.' That's my advice. Take it or leave it.
2d
comment What counts as undergraduate research?
If you name ends up on a peer reviewed publication there won't be any questions...
2d
comment Why do undergraduate admissions in the U.S take into account nonacademic criteria?
Universities routine skim a cut (called "overhead") from research grants, and some of that goes into the general budget. The funding agencies keep an eye on overhead levels so there is a limit to how much general funding can be developed in this way, but some definitely is.
2d
answered Where would the dark matter particle fit inside a picture of the standard model?
2d
comment What is the meaning of " Ψ is not a measurable quantity in itself"?
I'm a little confused by the question, that sentence means exactly what it says: you can't measure $\psi$. Did you expect that it was hiding something more subtle?
2d
comment Clarification regarding conceptual doubts
@Giffyguy I admit it has been a couple of years since I was really active on Stack Overflow, but while I was it was clearly a site for programmers and not for people just learning to program. It works fine for students once they can frame their questions in a programmer-like way and didn't ask for (a) their homework to be done for them or (b) something for which they should have Read The Furnished Manual. In other words the rules there are (or perhaps were, as I said I have not been active much recently) more like those on Physics SE than Math SE.
2d
comment Clarification regarding conceptual doubts
If you are using area51, then individual Stack Exchange users are the people you need to reach. And their interest will be a personal matter. Things you can do: mention it here; mention it in chat (but don't get spammy about it, please); create a on-site add for the proposal and collect enough votes that it starts showing up on the main site.
2d
comment Does the Advanced Photon Source use electrons or positrons?
The reason for preferring electrons would almost certainly be current. Capturing and cooling large number of positrons is challenging, which presumably limits the currents that can be achieved. Electrons, on the other hand, are plentiful. (And the APS uses some insane currents by usual accelerator standards.)
Apr
24
comment Is it possible to generate energy by the moon orbit?
See also: physics.stackexchange.com/questions/6400/… physics.stackexchange.com/questions/9290/…
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