Recent content by ORF

Dear experts, I noticed that super-heated water (liquid water with temperature above 100*C) undergoes boiling when pushed outside the meta-stable equilibrium. I was wondering, is the heat capacity of liquid water above 100*C the same as liquid water with temperature between 0*C and 100*C...

There are 2 approaches to determine if radioactive elements are newly produced in explosive astrophysical sites . One is based on the so-called optical transient: the opacity of the gas will change as the radioactive elements decay (beta or whatever), so the timescale of the change if given by...

The (alpha,n) reactions are the biggest source of background in low background laboratories, and a hot topic of research. The cross section of the reaction is extremely low, and it is challenging to measure. See this conference slides for further details.

In your step function, you can interrogate the step object what process happened, and if it is of interest you can get further information. Please see this topic in Geant4 forums for further details

Hi, I was told that "Every behavior beyond our most primal behaviors are learned/acquired behaviors". Is it true? If so, is there any room to choose what behavior to learn? Thank you for your time Cheers, ORF

Hi, I have a class master_t which is composed by two other classes, dev_a, dev_b. I would like that a member function from the dev_b object (within master_t) could use a member function of dev_a object (within master_t). This is a minimal working code, where line 26 implements this feature...

Hi, I think ENSDF/XUNDL databases are what you are looking for. You shall try first ENSDF (Evaluated data), https://www.nndc.bnl.gov/ensdf/ and if the data is not complete, you may try XUNDL (Unevaluated data), https://www.nndc.bnl.gov/ensdf/ensdf/xundl.jsp This is how XUNDL webpage looks...

Hi, thanks for your very complete explanation. After normalizing the pdf it converges nicely. I hope I can continue from it. Thanks, ORF

Thanks, but that example is exactly as the one in the documentation (replacing beta distro by exp). I would like to do unbinned and binned likelihood fits using a custom pdf/fitting function. Thank you for your time.

Hi, In this case the result is wrong. For other simple fitting function it complains either convergence is very slow or directly it reaches 100 iterations and it stops without converging. Probably there is something wrong with my code. Still, this method is for unbinned data. Is there any...

Hi, Thanks! It is a nice starting point. However this way of defining our own fitter seems quite primitive (for example, I would need to write another junk of code for calculating the covariance matrix). Is there any method like curve_fit but using Maximum Likelihood? Thank you for your...

Hi, I have been using Python for a while now, but so far for Least-squares fits using curve_fit from Scipy. I would like to start using Likelihood method to fit binned and unbinned data. I found some documentation in Scipy of how to implement unbinned likelihood fit, but I have not managed to...

Hi Many things in this thread... :) I will start by direct answer to the OP, and then other side notes Q: What is the heaviest isotopes synthesized during r-process? There is no experimental data available. According to nucleosynthesis calculations, which take into account very heavy...

Hi, You may find this database quite useful https://www.nndc.bnl.gov/ensdf/ Just put the source you are looking for, and it retrieves the all the reported measurements of that nucleus. Cheers, ORF

Well, to uncover new physics one may need something else apart from higher energy, for example, detector/technical development in some other part of the experimental setup.