[Halld-cpp] [EXTERNAL] Re: C++ classes for the 208Pb FFs

[Rory Miskimen]

Richard, I think for the B.H. calculation you probably just want the charge FF, i.e. the Fourier transform of the charge density, and a real number, correct? Maybe Ilya and I should converse on this.   I do have a Fortran code that calculates the charge FF from a model independent parameterization (Fourier Bessel) of the charge density (B. Frois et al.).  Rory


> On Jul 9, 2021, at 3:42 PM, Richard Jones <richard.t.jones at uconn.edu> wrote:
> 
> Ilya,
> 
> Sure, that works. I will take whatever you can share with me and parameterize it for use within a Monte Carlo generator.
> 
> -Richard Jones
> 
> On Fri, Jul 9, 2021 at 10:41 AM Ilya Larin <ilarin at jlab.org <mailto:ilarin at jlab.org>> wrote:
> 
>  Hello Richard and Elton.
> 
> I do have Fortran code for the lead FF.
> The approach we used takes into account
> internal absorption (reducing FF value accordingly) and thus it gives a complex value
> (like in optics light absorption can be described as an imaginary part of the refraction index).
> I can look it up. It takes about a few seconds for the Fourier Bessel
> nucleus density model to calculate the value. For the low Q^2 values
> it needs more accuracy since the region of integration
> proportional to 1/Q, so it takes even longer.
> 
> Let me know if it is what you are asking.
> 
>  Thank you.
>  Ilya
> 
> 
> От: Halld-cpp <halld-cpp-bounces at jlab.org <mailto:halld-cpp-bounces at jlab.org>> от имени Richard Jones <rjones30 at gmail.com <mailto:rjones30 at gmail.com>>
> Отправлено: 7 июля 2021 г. 17:12
> Кому: Elton Smith <elton at jlab.org <mailto:elton at jlab.org>>
> Копия: halld-cpp at jlab.org <mailto:halld-cpp at jlab.org> <halld-cpp at jlab.org <mailto:halld-cpp at jlab.org>>
> Тема: [Halld-cpp] [EXTERNAL] Re: C++ classes for the 208Pb FFs
>  
> Elton,
> 
> Having them in fortran is just as good, I can do the translation.
> 
> -rtj
> 
> On Wed, Jul 7, 2021 at 4:51 PM Elton Smith <elton at jlab.org <mailto:elton at jlab.org>> wrote:
> *Message sent from a system outside of UConn.*
> 
> 
> Dear colleagues,
> 
> Richard has requested that we provide him with C++ classes for the 208Pb form factors. I do not think we have them immediately available, but we should be able to provide them. In fact it might be useful to have them packaged systematically in that way for our own benefit. We should discuss how best to get this done at our next meeting. Any volunteers?
> 
> Thanks, Elton
> 
> 
> 
> ------------------------------------
> Elton Smith
> Jefferson Lab MS 12H3
> 12000 Jefferson Ave STE 4
> Newport News, VA 23606
> (757)269-7625
> 
> 
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