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Will a free neutron radiate if it is decelerated?


Can a photon transmit a momentum to a neutron?What does a subatomic charge actually mean?Conceptual doubts in EM waves and old quantum theoryWhy aren't charged particles constantly shining?Neutron acceleration and Electromagnetic radiationCan photons be created without an electric charge involved?Cherenkov radiationWhy can't we harness the energy from neutron + protium = deuteron reaction?How can a neutron star radiate when it is neutral?How does an ideal gas radiate?What is the frequency distribution of the electromagnetic wave emitted by a charge accelerating along a given trajectory?






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9












$begingroup$


In this answer it is said (and I fully agree):




Yes, a ... photon can accelerate a lone neutron. The kinetic energy imparted to the neutron reduces the photon's wavelength (redshifts it) by the same amount, so the total energy of the system remains the same.




In turn, the opposite process has to be possible too. Neutrons are able to radiate. This usually is said only for charged particles.





Electromagnetic waves are emitted by electrically charged particles undergoing acceleration, and these waves can subsequently interact with other charged particles Electromagnetic radiation





Will a free neutron radiate if it is decelerated?










share|cite|improve this question











$endgroup$











  • $begingroup$
    link.springer.com/article/10.1007/BF00892879
    $endgroup$
    – G. Smith
    Jul 2 at 22:09






  • 2




    $begingroup$
    Note that the neutron consists of three charged particles, one up and two down quarks.
    $endgroup$
    – infinitezero
    Jul 3 at 9:45










  • $begingroup$
    @infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
    $endgroup$
    – HolgerFiedler
    Jul 3 at 9:54






  • 2




    $begingroup$
    I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
    $endgroup$
    – infinitezero
    Jul 3 at 10:00

















9












$begingroup$


In this answer it is said (and I fully agree):




Yes, a ... photon can accelerate a lone neutron. The kinetic energy imparted to the neutron reduces the photon's wavelength (redshifts it) by the same amount, so the total energy of the system remains the same.




In turn, the opposite process has to be possible too. Neutrons are able to radiate. This usually is said only for charged particles.





Electromagnetic waves are emitted by electrically charged particles undergoing acceleration, and these waves can subsequently interact with other charged particles Electromagnetic radiation





Will a free neutron radiate if it is decelerated?










share|cite|improve this question











$endgroup$











  • $begingroup$
    link.springer.com/article/10.1007/BF00892879
    $endgroup$
    – G. Smith
    Jul 2 at 22:09






  • 2




    $begingroup$
    Note that the neutron consists of three charged particles, one up and two down quarks.
    $endgroup$
    – infinitezero
    Jul 3 at 9:45










  • $begingroup$
    @infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
    $endgroup$
    – HolgerFiedler
    Jul 3 at 9:54






  • 2




    $begingroup$
    I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
    $endgroup$
    – infinitezero
    Jul 3 at 10:00













9












9








9


0



$begingroup$


In this answer it is said (and I fully agree):




Yes, a ... photon can accelerate a lone neutron. The kinetic energy imparted to the neutron reduces the photon's wavelength (redshifts it) by the same amount, so the total energy of the system remains the same.




In turn, the opposite process has to be possible too. Neutrons are able to radiate. This usually is said only for charged particles.





Electromagnetic waves are emitted by electrically charged particles undergoing acceleration, and these waves can subsequently interact with other charged particles Electromagnetic radiation





Will a free neutron radiate if it is decelerated?










share|cite|improve this question











$endgroup$




In this answer it is said (and I fully agree):




Yes, a ... photon can accelerate a lone neutron. The kinetic energy imparted to the neutron reduces the photon's wavelength (redshifts it) by the same amount, so the total energy of the system remains the same.




In turn, the opposite process has to be possible too. Neutrons are able to radiate. This usually is said only for charged particles.





Electromagnetic waves are emitted by electrically charged particles undergoing acceleration, and these waves can subsequently interact with other charged particles Electromagnetic radiation





Will a free neutron radiate if it is decelerated?







electromagnetic-radiation photons neutrons






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Jul 3 at 11:31









Community

1




1










asked Jul 2 at 20:41









HolgerFiedlerHolgerFiedler

4,5713 gold badges14 silver badges42 bronze badges




4,5713 gold badges14 silver badges42 bronze badges











  • $begingroup$
    link.springer.com/article/10.1007/BF00892879
    $endgroup$
    – G. Smith
    Jul 2 at 22:09






  • 2




    $begingroup$
    Note that the neutron consists of three charged particles, one up and two down quarks.
    $endgroup$
    – infinitezero
    Jul 3 at 9:45










  • $begingroup$
    @infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
    $endgroup$
    – HolgerFiedler
    Jul 3 at 9:54






  • 2




    $begingroup$
    I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
    $endgroup$
    – infinitezero
    Jul 3 at 10:00
















  • $begingroup$
    link.springer.com/article/10.1007/BF00892879
    $endgroup$
    – G. Smith
    Jul 2 at 22:09






  • 2




    $begingroup$
    Note that the neutron consists of three charged particles, one up and two down quarks.
    $endgroup$
    – infinitezero
    Jul 3 at 9:45










  • $begingroup$
    @infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
    $endgroup$
    – HolgerFiedler
    Jul 3 at 9:54






  • 2




    $begingroup$
    I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
    $endgroup$
    – infinitezero
    Jul 3 at 10:00















$begingroup$
link.springer.com/article/10.1007/BF00892879
$endgroup$
– G. Smith
Jul 2 at 22:09




$begingroup$
link.springer.com/article/10.1007/BF00892879
$endgroup$
– G. Smith
Jul 2 at 22:09




2




2




$begingroup$
Note that the neutron consists of three charged particles, one up and two down quarks.
$endgroup$
– infinitezero
Jul 3 at 9:45




$begingroup$
Note that the neutron consists of three charged particles, one up and two down quarks.
$endgroup$
– infinitezero
Jul 3 at 9:45












$begingroup$
@infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
$endgroup$
– HolgerFiedler
Jul 3 at 9:54




$begingroup$
@infinitezero This note often appears, but is not necessary. My question aimed at the fact that not only charged particles radiate.
$endgroup$
– HolgerFiedler
Jul 3 at 9:54




2




2




$begingroup$
I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
$endgroup$
– infinitezero
Jul 3 at 10:00




$begingroup$
I think that is a matter of perspective. The net charge of a neutron is zero, but its inner structure leads to the radiation.
$endgroup$
– infinitezero
Jul 3 at 10:00










2 Answers
2






active

oldest

votes


















19












$begingroup$

The neutron is magnetic. It is a tiny little magnet. In more formal language, it carries a magnetic dipole moment of size
$$
mu_n = −9.6623647(23) times 10^−27 rm J,T^−1.
$$

This is what allows it to interact with electromagnetic waves---or, to say the same thing another way, with photons. This also means that when accelerated then yes, it will generate electromagnetic radiation. This effect is much smaller that the radiation of a charged particle with the same acceleration.



You can associate this radiation with the presence of accelerating charge, indirectly, by noting that the neutron has charged quarks inside it, but strictly speaking those components have to be treated by quantum theory so they shouldn't be thought of as little separate charges. The calculation in terms of magnetic dipole moment is more appropriate.






share|cite|improve this answer









$endgroup$








  • 1




    $begingroup$
    Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
    $endgroup$
    – Gyromagnetic
    Jul 3 at 13:30











  • $begingroup$
    @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
    $endgroup$
    – Andrew Steane
    Jul 3 at 14:29






  • 2




    $begingroup$
    Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
    $endgroup$
    – rob
    Jul 3 at 16:36










  • $begingroup$
    It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
    $endgroup$
    – KF Gauss
    Jul 4 at 17:45


















-1












$begingroup$

We take a charged ball and shake it. There must be electromagnetic radiation from the shake. When we shake an electrically neutral object, it does not emit electromagnetic radiation from the shaking.



This situation cannot be explained by photons. Otherwise, an electrically neutral object will radiate when it is shaken. Because charged particles (proton, electrons) inside object radiate photons, objects radiate. But this is clearly not the case.






share|cite|improve this answer








New contributor



Cang Ye is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    19












    $begingroup$

    The neutron is magnetic. It is a tiny little magnet. In more formal language, it carries a magnetic dipole moment of size
    $$
    mu_n = −9.6623647(23) times 10^−27 rm J,T^−1.
    $$

    This is what allows it to interact with electromagnetic waves---or, to say the same thing another way, with photons. This also means that when accelerated then yes, it will generate electromagnetic radiation. This effect is much smaller that the radiation of a charged particle with the same acceleration.



    You can associate this radiation with the presence of accelerating charge, indirectly, by noting that the neutron has charged quarks inside it, but strictly speaking those components have to be treated by quantum theory so they shouldn't be thought of as little separate charges. The calculation in terms of magnetic dipole moment is more appropriate.






    share|cite|improve this answer









    $endgroup$








    • 1




      $begingroup$
      Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
      $endgroup$
      – Gyromagnetic
      Jul 3 at 13:30











    • $begingroup$
      @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
      $endgroup$
      – Andrew Steane
      Jul 3 at 14:29






    • 2




      $begingroup$
      Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
      $endgroup$
      – rob
      Jul 3 at 16:36










    • $begingroup$
      It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
      $endgroup$
      – KF Gauss
      Jul 4 at 17:45















    19












    $begingroup$

    The neutron is magnetic. It is a tiny little magnet. In more formal language, it carries a magnetic dipole moment of size
    $$
    mu_n = −9.6623647(23) times 10^−27 rm J,T^−1.
    $$

    This is what allows it to interact with electromagnetic waves---or, to say the same thing another way, with photons. This also means that when accelerated then yes, it will generate electromagnetic radiation. This effect is much smaller that the radiation of a charged particle with the same acceleration.



    You can associate this radiation with the presence of accelerating charge, indirectly, by noting that the neutron has charged quarks inside it, but strictly speaking those components have to be treated by quantum theory so they shouldn't be thought of as little separate charges. The calculation in terms of magnetic dipole moment is more appropriate.






    share|cite|improve this answer









    $endgroup$








    • 1




      $begingroup$
      Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
      $endgroup$
      – Gyromagnetic
      Jul 3 at 13:30











    • $begingroup$
      @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
      $endgroup$
      – Andrew Steane
      Jul 3 at 14:29






    • 2




      $begingroup$
      Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
      $endgroup$
      – rob
      Jul 3 at 16:36










    • $begingroup$
      It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
      $endgroup$
      – KF Gauss
      Jul 4 at 17:45













    19












    19








    19





    $begingroup$

    The neutron is magnetic. It is a tiny little magnet. In more formal language, it carries a magnetic dipole moment of size
    $$
    mu_n = −9.6623647(23) times 10^−27 rm J,T^−1.
    $$

    This is what allows it to interact with electromagnetic waves---or, to say the same thing another way, with photons. This also means that when accelerated then yes, it will generate electromagnetic radiation. This effect is much smaller that the radiation of a charged particle with the same acceleration.



    You can associate this radiation with the presence of accelerating charge, indirectly, by noting that the neutron has charged quarks inside it, but strictly speaking those components have to be treated by quantum theory so they shouldn't be thought of as little separate charges. The calculation in terms of magnetic dipole moment is more appropriate.






    share|cite|improve this answer









    $endgroup$



    The neutron is magnetic. It is a tiny little magnet. In more formal language, it carries a magnetic dipole moment of size
    $$
    mu_n = −9.6623647(23) times 10^−27 rm J,T^−1.
    $$

    This is what allows it to interact with electromagnetic waves---or, to say the same thing another way, with photons. This also means that when accelerated then yes, it will generate electromagnetic radiation. This effect is much smaller that the radiation of a charged particle with the same acceleration.



    You can associate this radiation with the presence of accelerating charge, indirectly, by noting that the neutron has charged quarks inside it, but strictly speaking those components have to be treated by quantum theory so they shouldn't be thought of as little separate charges. The calculation in terms of magnetic dipole moment is more appropriate.







    share|cite|improve this answer












    share|cite|improve this answer



    share|cite|improve this answer










    answered Jul 2 at 21:29









    Andrew SteaneAndrew Steane

    8,4721 gold badge11 silver badges45 bronze badges




    8,4721 gold badge11 silver badges45 bronze badges







    • 1




      $begingroup$
      Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
      $endgroup$
      – Gyromagnetic
      Jul 3 at 13:30











    • $begingroup$
      @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
      $endgroup$
      – Andrew Steane
      Jul 3 at 14:29






    • 2




      $begingroup$
      Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
      $endgroup$
      – rob
      Jul 3 at 16:36










    • $begingroup$
      It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
      $endgroup$
      – KF Gauss
      Jul 4 at 17:45












    • 1




      $begingroup$
      Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
      $endgroup$
      – Gyromagnetic
      Jul 3 at 13:30











    • $begingroup$
      @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
      $endgroup$
      – Andrew Steane
      Jul 3 at 14:29






    • 2




      $begingroup$
      Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
      $endgroup$
      – rob
      Jul 3 at 16:36










    • $begingroup$
      It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
      $endgroup$
      – KF Gauss
      Jul 4 at 17:45







    1




    1




    $begingroup$
    Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
    $endgroup$
    – Gyromagnetic
    Jul 3 at 13:30





    $begingroup$
    Nice Answer! Don't wanna be a killjoy but this is only true for a spin-polarized neutron, right? If you catch a neutron out in the wild (no magnetic fields) it's very likely its quantum-states will be thermalized, in which case, decelerating it would not radiate.
    $endgroup$
    – Gyromagnetic
    Jul 3 at 13:30













    $begingroup$
    @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
    $endgroup$
    – Andrew Steane
    Jul 3 at 14:29




    $begingroup$
    @Gyromagnetic A thermal ensemble is equivalent to a mixture with each neutron in a pure state, so each neutron does emit, but if it is close to other neutrons (within of order a wavelength) then I guess the interferometric cancellation will surpress the net effect.
    $endgroup$
    – Andrew Steane
    Jul 3 at 14:29




    2




    2




    $begingroup$
    Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
    $endgroup$
    – rob
    Jul 3 at 16:36




    $begingroup$
    Two notes. (1) The neutron magnetic moment is more conveniently written in different units, as 50 nano-eV per tesla. Repolarizing in a magnetic field has a big effect on the motion of "ultra-cold" neutrons, with kinetic energies below 100 neV, but not so much on thermal neutrons with milli-eV energies. (2) A second neutron isn't required for interference effects. In single-crystal neutron interferometer experiments, it's not uncommon to obtain an interference pattern even though the number of events where two neutrons were present in the interferometer at the same time was zero.
    $endgroup$
    – rob
    Jul 3 at 16:36












    $begingroup$
    It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
    $endgroup$
    – KF Gauss
    Jul 4 at 17:45




    $begingroup$
    It would be useful for this answer's completeness to calculate the acceleration needed to get RF/optical radiation from a neutron.
    $endgroup$
    – KF Gauss
    Jul 4 at 17:45













    -1












    $begingroup$

    We take a charged ball and shake it. There must be electromagnetic radiation from the shake. When we shake an electrically neutral object, it does not emit electromagnetic radiation from the shaking.



    This situation cannot be explained by photons. Otherwise, an electrically neutral object will radiate when it is shaken. Because charged particles (proton, electrons) inside object radiate photons, objects radiate. But this is clearly not the case.






    share|cite|improve this answer








    New contributor



    Cang Ye is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





    $endgroup$

















      -1












      $begingroup$

      We take a charged ball and shake it. There must be electromagnetic radiation from the shake. When we shake an electrically neutral object, it does not emit electromagnetic radiation from the shaking.



      This situation cannot be explained by photons. Otherwise, an electrically neutral object will radiate when it is shaken. Because charged particles (proton, electrons) inside object radiate photons, objects radiate. But this is clearly not the case.






      share|cite|improve this answer








      New contributor



      Cang Ye is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.





      $endgroup$















        -1












        -1








        -1





        $begingroup$

        We take a charged ball and shake it. There must be electromagnetic radiation from the shake. When we shake an electrically neutral object, it does not emit electromagnetic radiation from the shaking.



        This situation cannot be explained by photons. Otherwise, an electrically neutral object will radiate when it is shaken. Because charged particles (proton, electrons) inside object radiate photons, objects radiate. But this is clearly not the case.






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        $endgroup$



        We take a charged ball and shake it. There must be electromagnetic radiation from the shake. When we shake an electrically neutral object, it does not emit electromagnetic radiation from the shaking.



        This situation cannot be explained by photons. Otherwise, an electrically neutral object will radiate when it is shaken. Because charged particles (proton, electrons) inside object radiate photons, objects radiate. But this is clearly not the case.







        share|cite|improve this answer








        New contributor



        Cang Ye is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.








        share|cite|improve this answer



        share|cite|improve this answer






        New contributor



        Cang Ye is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.








        answered Jul 4 at 14:31









        Cang YeCang Ye

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