<p>In what astronomical scenario beta decay happen? I suppose that this process can happen in many astrophysical events, but where is more probable? or is it unlikely to manifest?</p>

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2021-11-21T00:46:39.600Z
This looks like an assignment you have been given. Is it? What is the background or context to you asking this question?
James K
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2021-11-21T01:12:26.980Z
Hint: how are neutrons created?
PM 2Ring
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2021-11-21T08:59:41.007Z
@PM2Ring Inverse beta decay ?
ProfRob
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2021-11-21T12:34:15.047Z
@ProfRob I assume the OP is interested in all forms of astrophysical beta decay, but surely the positron emission in the p-p chain is the most prominent. FWIW, I'd just call that beta+ decay. According to https://en.wikipedia.org/wiki/Inverse_beta_decay inverse beta decays involves a neutron or proton being hit by a lepton. That seems like a sensible convention to me, but I'm not a real particle physicist. ;)
PM 2Ring
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2021-11-21T15:08:06.187Z
Most of the neutrons in the universe were created by inverse beta decay $ p + e \rightarrow n +\nu $, with either free protons or in nuclei.
ProfRob
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2021-11-21T18:58:22.757Z
Were they, or were they formed directly out of "free" quarks?  Wikipedia suggests that barogenesis produces a n:p ratio of about 1:1, and then neutrons react with positrons and neutrinos to produce protons resulting in a n:p ratio of 1:6.  While some neutrons would be formed from protons by the inverse process, most neutrons are primordal. They were formed directly from quarks as the temperature dropped below 10^12 K.  I am well out of my depth here.  Not waving but drowning.
James K
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2021-11-22T09:33:52.947Z
I was only talking about the neutrons being created in the modern universe. Certainly, most neutrons are in the primordial helium produced during Big Bang nucleosynthesis.
PM 2Ring
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2021-11-27T23:44:53.507Z
@JamesK I´m creating a game using the standard model, and the idea is to be educative, so i want to put it in context, i wanna know if it happens in star core´s when they are at principal secuence phase or i dont know in the surface of a neutron star
martín canullán
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2021-11-28T03:10:56.950Z
@JamesK that´s something to start, thanks very much.
martín canullán
<astrophysics>
Beta decay in astronomy
martín canullán
# Beta decay in astronomy

(Asked by: username_0 on 2021-11-21)

In what astronomical scenario beta decay happen? I suppose that this process can happen in many astrophysical events, but where is more probable? or is it unlikely to manifest?

**Tags:** astrophysics
> **Comments:**
> **username_1**: This looks like an assignment you have been given. Is it? What is the background or context to you asking this question?  
> **username_2**: Hint: how are neutrons created?  
> **username_3**: @PM2Ring Inverse beta decay ?  
> **username_2**: @ProfRob I assume the OP is interested in all forms of astrophysical beta decay, but surely the positron emission in the p-p chain is the most prominent. FWIW, I'd just call that beta+ decay. According to https://en.wikipedia.org/wiki/Inverse_beta_decay inverse beta decays involves a neutron or proton being hit by a lepton. That seems like a sensible convention to me, but I'm not a real particle physicist. ;)  
> **username_3**: Most of the neutrons in the universe were created by inverse beta decay $ p + e \rightarrow n +\nu $, with either free protons or in nuclei.  
> **username_1**: Were they, or were they formed directly out of "free" quarks?  Wikipedia suggests that barogenesis produces a n:p ratio of about 1:1, and then neutrons react with positrons and neutrinos to produce protons resulting in a n:p ratio of 1:6.  While some neutrons would be formed from protons by the inverse process, most neutrons are primordal. They were formed directly from quarks as the temperature dropped below 10^12 K.  I am well out of my depth here.  Not waving but drowning.  
> **username_2**: I was only talking about the neutrons being created in the modern universe. Certainly, most neutrons are in the primordial helium produced during Big Bang nucleosynthesis.  
> **username_0**: @JamesK I´m creating a game using the standard model, and the idea is to be educative, so i want to put it in context, i wanna know if it happens in star core´s when they are at principal secuence phase or i dont know in the surface of a neutron star  
> **username_0**: @JamesK that´s something to start, thanks very much.  

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