[NTG-context] Nuclear reactions

[NTG-context] Nuclear reactions

[Gavin via ntg-context]

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Hi list,

I’m writing nuclear reactions. When add prescripts to atomic symbols with two letters, (Be, Sr, Xe, etc.) the prescripts split the atoms! (See output below.) 

\starttext
Text:   \lohi[left]{4}{10}Be.
Reaction:
\startformula
  {\rm U}^^{235}__{92} + n \rightarrow {\rm Sr}^^{94}__{38} + {\rm Xe}^^{140}__{54} + 2n
\stopformula 
\stoptext

I looked at \chemical and \molecule, but could not find a way to make isotopes with those. Any ideas?

Gavin


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Re: [NTG-context] Nuclear reactions

[Gavin via ntg-context]

Hi List,

I am still interested in knowing if there is a good way to do nuclear reactions using \chemical. But I found something that works for my current needs:

\define[1]\Sr{\mathord{\rm Sr}__{38}^^{#1}}
\define[1]\Xe{\mathord{\rm Xe}__{54}^^{#1}}
\define[1]\U{\mathord{\rm U}__{92}^^{#1}}

\starttext
Reaction:
\startformula
  \U{235} + n \rightarrow \Sr{94} + \Xe{140} + 2n
\stopformula 
\stoptext

Since I will be writing many reactions with a dozen or so different atomic symbols, it makes sense to create a command for each atomic symbol that adds the correct atomic number and takes the mass number as an argument.

Hope someone else can benefit. I still getting used to ConTeXt's treatment of {…}, which does not appear to be TeX's way.

Gavin


> On Apr 15, 2023, at 11:19 AM, Gavin <gavinpublic@comcast.net> wrote:
> 
> Hi list,
> 
> I’m writing nuclear reactions. When add prescripts to atomic symbols with two letters, (Be, Sr, Xe, etc.) the prescripts split the atoms! (See output below.) 
> 
> \starttext
> Text:   \lohi[left]{4}{10}Be.
> Reaction:
> \startformula
>  {\rm U}^^{235}__{92} + n \rightarrow {\rm Sr}^^{94}__{38} + {\rm Xe}^^{140}__{54} + 2n
> \stopformula 
> \stoptext
> 
> I looked at \chemical and \molecule, but could not find a way to make isotopes with those. Any ideas?
> 
> Gavin
> 
> <PastedGraphic-1.pdf>

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Re: [NTG-context] Nuclear reactions

[Hans Åberg via ntg-context]

> On 15 Apr 2023, at 19:19, Gavin via ntg-context <ntg-context@ntg.nl> wrote:
> 
> I’m writing nuclear reactions. When add prescripts to atomic symbols with two letters, (Be, Sr, Xe, etc.) the prescripts split the atoms!

One can use Unicode superscript and subscript numbers, as in ²³⁵₉₂U, which is easier to read. For input, an editor supporting text substitutions might be used.


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Re: [NTG-context] Nuclear reactions

[Tomáš Hála via ntg-context]

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Hi Gavin,

maybe you have solved your problem yet.

\startformula
 {\null}^^{194}__{38}{\rm Sr}
or  {\hbox{Xe}}^^{140}__{54}.
\stopformula

Better, ConTeXt way could be the variation on \chem:

\unexpanded\def\isotope#1#2#3{\dontleavehmode\begingroup\null\lohi[left]{#2}{#3}#1\endgroup}
\isotope{Sr}{38}{194}
or (with more logical order of parameters)
\unexpanded\def\isotope#1#2#3{\dontleavehmode\begingroup\null\lohi[left]{#1}{#2}#3\endgroup}
\isotope{38}{999}{Sr}

Or for text and math modes together:

\unexpanded\def\isotope#1#2#3{%
\ifmmode\begingroup\null^^{#1}__{#2}{\rm#3}\endgroup%
   \else\dontleavehmode\begingroup\null\lohi[left]{\tfx #1}{\tfx#2}\rm#3\endgroup%
\fi}

\isotope{999}{38}{Sr}
\startformula
\isotope{999}{38}{Sr}
\stopformula

You can do it either way, whichever way suits you better.

Tomáš


________________________________
Od: ntg-context <ntg-context-bounces@ntg.nl> za uživatele Hans Åberg via ntg-context <ntg-context@ntg.nl>
Odesláno: sobota 15. dubna 2023 22:41
Komu: mailing list for ConTeXt users <ntg-context@ntg.nl>
Kopie: Hans Åberg <haberg-1@telia.com>
Předmět: Re: [NTG-context] Nuclear reactions


> On 15 Apr 2023, at 19:19, Gavin via ntg-context <ntg-context@ntg.nl> wrote:
>
> I’m writing nuclear reactions. When add prescripts to atomic symbols with two letters, (Be, Sr, Xe, etc.) the prescripts split the atoms!

One can use Unicode superscript and subscript numbers, as in ²³⁵₉₂U, which is easier to read. For input, an editor supporting text substitutions might be used.


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Re: [NTG-context] Nuclear reactions

[Alan Braslau via ntg-context]

On Sat, 15 Apr 2023 12:02:28 -0600
Gavin via ntg-context <ntg-context@ntg.nl> wrote:

> Hi List,
> 
> I am still interested in knowing if there is a good way to do nuclear
> reactions using \chemical.

From the chemical manual:

As in mathematical typesetting mode, subscripts and superscripts can
precede text. Thus, isotopes (such as this alpha particle, for
example), can be written as: \chemical{^4_2He^{2+}}. But compare the
alignment of \chemical{_{92}^{238}U} with
\chemical{\lohi[left]{92}{238}U}.

I have not used chemical formulas for some time, but

\chemical{^{235)_{92}U,+,$n$,->,^{94}_{38}Sr,+,^{140}_{54}Xe,+,$2n$}

"->" and "GIVES" are synonyms, as are "+" and "PLUS"
(also MINUS, SINGLE, DOUBLE, TRIPLE, EQUILIBRIUM, MESOMERIC with ascii
and unicode synonyms).

Alignment can be altered using \lohi[left]{92}{235} 
(remember left is flushright)


There is also "display mode" for chemical formulae:

\startchemicalformula
    \chemical{text}
    \chemical{text}{below}
    \chemical{text}{above}{below}
\stopchemicalformula

where above and below can be used for labels, etc.

Alan
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