Neutron ❍｜appendage｜___｜20260628174208-01-•

A	B
The quark content of a neutron. The color assignment of individual quarks is arbitrary, but all three colors must be present. Forces between quarks are mediated by gluons.	…
Classification	Baryon
Composition	1 up quark, 2 down quarks
Statistics	Fermionic
Family	Hadron
Interactions	Gravity, weak, strong, electromagnetic
Symbol	n, n${}^0$ ​, N${}^0$ ​
Antiparticle	Antineutron
Theorized	Ernest Rutherford1 (1920)
Discovered	James Chadwick2 (1932)
Mass	1.67492750056(85)×10${}^{-27}$ kg‍3 939.56542194(48) MeV/c${}^2$‍4 1.00866491606(40) Da‍5
Mean lifetime	878.4(5) s (free)6
Electric charge	0 e (−2±8)×10${}^{-22}$ e (experimental limits)7
Electric dipole moment	< 1.8×10${}^{-26}$ e⋅cm (experimental upper limit)
Electric polarizability	1.16(15)×10${}^{-3}$ fm${}^3$
Magnetic moment	−0.96623650(23)×10${}^{-26}$ J·T${}^{-1}$8 −1.04187563(25)×10${}^{-3}$ μ${}_B$8 −1.91304273(45) μ${}_N$8
Magnetic polarizability	3.7(20)×10${}^{-4}$ fm${}^3$
Spin	⁠1/2⁠ ħ
Isospin	−⁠1/2⁠
Parity	+1
Condensed	I(J${}^P$) = ⁠1/2⁠(⁠1/2⁠${}^{+}$)

Neutron

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Footnotes

1. Ernest Rutherford Archived 2011-08-03 at the Wayback Machine. Chemed.chem.purdue.edu. Retrieved on 2012-08-16. ↩

2. 1935 Nobel Prize in Physics Archived 2017-10-03 at the Wayback Machine. Nobelprize.org. Retrieved on 2012-08-16. ↩

3. “2022 CODATA Value: neutron mass”. The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18. ↩

4. “2022 CODATA Value: neutron mass energy equivalent in MeV”. The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18. ↩

5. “2022 CODATA Value: neutron mass in u”. The NIST Reference on Constants, Units, and Uncertainty. NIST. May 2024. Retrieved 2024-05-18. ↩

6. Zyla, P. A. (2020). “n MEAN LIFE”. PDG Live: 2020 Review of Particle Physics. Particle Data Group. Archived from the original on 17 January 2021. Retrieved 25 February 2021. ↩

7. Olive, K.A.; (Particle Data Group); et al. (2014). “Review of Particle Physics” (PDF). Chinese Physics C. 38 (9): 1–708. arXiv:1412.1408. Bibcode:2014ChPhC..38i0001O. doi:10.1088/1674-1137/38/9/090001. hdl:10481/34376. PMID 10020536. S2CID 118395784. Archived (PDF) from the original on 2020-06-01. Retrieved 2017-10-26. ↩

8. Mohr, P.J.; Taylor, B.N. and Newell, D.B. (2014), “The 2014 CODATA Recommended Values of the Fundamental Physical Constants” Archived 2013-10-09 at the Wayback Machine (Web Version 7.0). The database was developed by J. Baker, M. Douma, and S. Kotochigova. (2014). National Institute of Standards and Technology, Gaithersburg, Maryland 20899. ↩ ↩² ↩³