# Can nuclear weapons explosion produce neutrino pluse ?

Can nuclear weapons explosion produce "neutrino pluse"?

Can nuclear weapons explosion produce "neutrino pluse"?

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Meir Achuz
Homework Helper
Gold Member

Yes, but neutrinos are completely harmless.

Yes, but neutrinos are completely harmless.
Well, they are not _completely_ harmless, but energy released through conventional pathways is much more damaging than neutrinos.

With nukes, you don't even have to worry (much) about direct gamma radiation. Any person close enough to the epicenter to suffer radiation sickness, will most likely get killed by the combination of the shockwave and infrared radiation.

Astronuc
Staff Emeritus

To my knowledge, neutrinos are not generated during the fission process - just fission products (two nuclei), neutrons and gamma rays, and photons from X-rays to infrared as ionized atoms regain electrons (recombination). The neutrinos come afterward from the beta decays of the fission products - and that would be seconds, minutes, hours or days later (depending on the radionuclide).

In a nuclear weapon, the fission reaction is over in a matter of microseconds, as it is prompt supercritical until the fissile material is dispersed (it vaporizes).

Besides - neutrinos have a very low cross-section for interaction with matter.

don’t neutrinos pass through our body every second from the sun .

Thank you "Astronuc"^_^

"Hydrogen Bomb" explosion can produce "neutrino pluse" ?

As we know,during ''core-collapse supernova"explosion, the hot temprature can produce numerous neutrinos and antineutrinos .During SN1987a, here we on earth detected them.

During the nuclear explosion, the temprature is very very hot in the explosion center,if the temprature is hot enough to produce "neutrino-antineutrino" pairs(thermal neutrino)?

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Astronuc
Staff Emeritus

Thank you "Astronuc"^_^

"Hydrogen Bomb" explosion can produce "neutrino pluse" ?
A hydrogen bomb explosion is also of a short duration - again in microseconds. The fusion (mostly d+t, but probably some d+d, assuming a D+T mixture) is initiated by the gamma/X-ray burst from a fission (trigger) explosion.

The fusion reaction is short term, and I believe neutrinos are absent. d+t -> alpha + n, and d+d -> p + t or n + He3.

A "core-collapse supernova" explosion takes place over days, so it is orders of magnitude greater than any thermonuclear explosion humans can achieve.

Staff Emeritus
2019 Award

A "core-collapse supernova" explosion takes place over days, so it is orders of magnitude greater than any thermonuclear explosion humans can achieve.
The neutrino production phase takes around 90 seconds. Neutrinos are produced through the process $p + e^- \rightarrow n + \nu_e$ as the core becomes a neutron star. (That's where the neutrons come from to make a neutron star). This process is negligible in nuclear explosions.

You're absolutely right that the energies in SN are enormous. They are measured in units of 1051 ergs.

Astronuc
Staff Emeritus
The neutrino production phase takes around 90 seconds. Neutrinos are produced through the process $p + e^- \rightarrow n + \nu_e$ as the core becomes a neutron star. (That's where the neutrons come from to make a neutron star). This process is negligible in nuclear explosions.