Referat and Exam of Roman Pritula

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Re: Referat by Roman Pritula

New postby Roman_Pritula_MEPhI on Wed 11 Jan 2012 21:45

Спасибо за пояснение, что-то не пришло в голову, что отношение может просто единицей быть.
В таком случае, получается, что некорректно будет использовать формулу ρHe/ρB = 2*(n/p)/(1+n/p) для расчета доли первичного гелия? Так как получим отсутствие первичных протонов и 100% гелия.
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Re: Referat by Roman Pritula

New postby Maxim Khlopov on Wed 11 Jan 2012 22:55

Dear Roman,
Why, the formula gives you correctly almost 100% of He.
However, free proton (and neutron) abundance is not zero.
There should be some small amount of frozen out free neutrons and protons.
Please, estimate this amount
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Re: Referat by Roman Pritula

New postby Roman_Pritula_MEPhI on Thu 12 Jan 2012 13:35

Спасибо за пояснение.
Постарался всё учесть в третьей версии.
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Re: Referat by Roman Pritula

New postby Maxim Khlopov on Thu 12 Jan 2012 14:11

Dear Roman,
To make the final version, please, correct missprints and make corrections following my comments in the attached text. The essential is to estimate the amount of free protons in your model
I wait for the final version to admit you to exam
Regards
M.Yu.Khlopov
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Weakless_Pritula_3Cor.doc
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Re: Referat by Roman Pritula

New postby Roman_Pritula_MEPhI on Thu 12 Jan 2012 15:52

Максим Юрьевич, верно ли будет для оценки концентрации водорода исходить из того, что образование гелия завершится, когда температура снизится до значения энергии связи гелия, и оставшиеся на этот момент протоны останутся свободными?
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Re: Referat by Roman Pritula

New postby Maxim Khlopov on Thu 12 Jan 2012 16:31

Dear Roman,
Freezing out of free protons takes place, when the rate of n+p -> D + gamma reaction becomes smaller, than the rate of expansion. This condition determines (in case n/p=1) the abundance of protons, which remain free.
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Re: Referat by Roman Pritula

New postby Roman_Pritula_MEPhI on Thu 12 Jan 2012 17:41

Четвертый вариант реферата.
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Re: Referat by Roman Pritula

New postby Maxim Khlopov on Thu 12 Jan 2012 18:28

Dear Roman,
Though I cannot consider this text as perfect, we can stop at this moment work on it.
You are admitted to exam tomorrow
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Exam of Roman Pritula

New postby Maxim Khlopov on Mon 16 Jan 2012 15:41

Exam of Roman Pritula
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