Ultracold neutrons

JUN 01, 1977

Neutrons with energies around one hundred nanoelectron volts can be extracted from reactors and stored for up to 400 seconds—long enough to encourage a search for the neutron electric dipole moment.

DOI: 10.1063/1.3037596

V. I. Luschikov

Nearly twenty years ago Ya. B. Zeldovich pointed out that free neutrons, if sufficiently slow, could in principle be stored in a closed “bottle”—presumably for periods up to the beta decay lifetime, about $10^{3} seconds .$ Apparently, according to Bruno Pontecorvo, Enrico Fermi had mentioned this possibility as early as the middle 1930’s, but Zeldovich’s paper was the first published discussion. The basis for the belief that neutrons could be stored in this way was the behavior of the effective potential for the interaction of neutrons with matter, which for many substances becomes repulsive when the neutrons are sufficiently slow. Thus there is a strong suppression of inelastic processes for these very slow neutrons (energies below about $10^{−7} eV$ ), and they are totally reflected upon collisions with, for example, container walls.

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References

1. Ya. B. Zel’dovitch, Sov. Phys. JETP 9, 1389 (1959).https://doi.org/SPHJAR
2. L. Foldy, in Preludes in Theoretical Physics (A. de Shalit, H. Feshbach, L. Van Hove, eds.) North‐Holland, Amsterdam (1966): page 205.
3. F. L. Shapiro, Sov. Phys. Uspekhi 11, 345 (1968).https://doi.org/SOPUAP
4. V. I. Luschikov, Ya. N. Pokotilovski, A. V. Strelkov, F. L. Shapiro, Sov. Phys. JETP Lett. 9, 23 (1969); https://doi.org/SPHJAR
JINR preprint R3‐4127 (Dubna, 1968).
5. A. Steyerl, Phys. Lett. 29B, 33 (1969).https://doi.org/PYLBAJ
6. F. L. Shapiro, Int. Conf. on Nuclear Structure Study with Neutrons, held in Budapest, July–Aug. 1972;
JINR preprint R3‐7135 (Dubna, 1973).
7. I. M. Frank, JINR preprint R3‐7810 (Dubna, 1974).
8. Yu. S. Zamjatnin, A. G. Kolesov, E. N. Kulagin, V. I. Luschikov, V. I. Morozov, V. N. Nefedov, Yu. N. Pokotilovski, A. V. Strelkov, F. L. Shapiro, JINR communication R3‐7946 (Dubna, 1974).
9. V. V. Golikov, V. I. Luschikov, F. L. Shapiro, Sov. Phys. JETP 37, 41 (1973).https://doi.org/SPHJAR
10. L. V. Groshev, V. N. Dvoretsky, A. M. Demidov, V. I. Luschikov, Yu. N. Panin, Yu. N. Pokotilovski, A. V. Strelkov, F. L. Shapiro, JINR preprint R3‐7282 (Dubna, 1973).
11. E. Z. Akhmetov, V. V. Golikov, D. K. Kaipov, V. A. Konks, A. V. Strelkov, JINR communication R3‐8470 (Dubna, 1974).
12. I. Bercheanu, V. K. Ignatovich, Vacuum 23, 441 (1973).https://doi.org/VACUAV
13. D. Winfield, J. M. Robson, Can. J. Phys. 53, 667 (1975).https://doi.org/CJPHAD
14. A. I. Egorov, V. M. Lobashov, V. A. Nazarenko, G. D. Porsev, A. P. Serebrov, Sov. J. Nucl. Phys. 19, 300 (1974).https://doi.org/SJNCAS
15. A. Steyerl, in Proceedings of the 2nd. Int. School on Neutron Physics, (held at Alushta, April 1974) published as JINR D3‐7991 (Dubna, 1974), page 42;
A. Steyerl, W.‐D. Trustedt, Z. Physik 267, 379 (1974).https://doi.org/ZEPYAA
16. A. Steyerl, Nucl. Inst. and Meth. 125, 461 (1975).https://doi.org/NUIMAL
17. N. T. Kashukeev, G. A. Stanev, N. B. Janeva, D. S. Mircheva, Nucl. Inst. and Meth. 126, 43 (1975).https://doi.org/NUIMAL
18. L. V. Groshev, V. I. Luschikov, S. A. Nikolaev, Yu. N. Panin, Yu. N. Pokotilovsky, A. V. Strelkov, JINR preprint R3‐9534 (Dubna, 1976).
19. V. K. Ignatovich, V. I. Luschikov, JINR communication R3‐8795 (Dubna, 1975).
20. L. V. Groshev, V. I. Luschikov, S. A. Nikolaev, Yu. N. Panin, Yu. N. Pokotilovsky, A. V. Strelkov, Proceedings of a conference on neutron physics (held at Kiev in 1975), Obninsk, 1976.
21. A. V. Stepanov, INR preprint P‐0004 (Moscow, 1975).
22. I. M. Frank, JINR communication R4‐8851 (Dubna, 1975).
23. V. K. Ignatovich, JINR preprint E4‐8039 (Dubna, 1974).
24. R. Lenk, Physica Status Solidi (a) 25, K141 (1974).https://doi.org/PSSABA
25. P. D. Miller, in Proceedings of the 2nd Int. School on Neutron Physics (held at Alushta, April 1974), published as JINR D3‐7991 (Dubna, 1975), page 100;
W. B. Dress, P. D. Miller, J. M. Pendlebury, P. Perrin, N. F. Ramsey, Phys. Rev. D 15, 9 (1977).https://doi.org/PRVDAQ
26. Yu. V. Taran, JINR communications R3‐7147 and R3‐7149 (Dubna, 1973).
27. A. I. Egorov, V. F. Ezhov, S. N. Ivanov, V. A. Knjaz’kov, V. M. Lobashov, V. A. Nazarenko, G. D. Porsev, A. P. Serebrov, Sov. J. Nucl. Phys. 21, 292 (1975).https://doi.org/SJNCAS
28. V. V. Vladimirsky, Sov. Phys. JETP 12, 740 (1961).https://doi.org/SPHJAR
29. V. K. Ignatovich, JINR preprint E8‐8404 (Dubna, 1974).
30. I. M. Matora, Sov. J. Nucl. Phys. 16, 624 (1972).https://doi.org/SJNCAS
31. L. D. Landau, E. M. Lifshitz, Quantum Mechanics, Pergamon, London (1959): section 24.
32. V. B. Beliaev, JINR preprint R‐1014 (Dubna, 1962).
33. L. V. Groshev, V. N. Dvoretsky, A. M. Demidov, V. I. Luschikov, Yu. N. Panin, Yu. N. Pokotilovsky, A. V. Strelkov, F. L. Shapiro, Phys. Lett. 34B, 293 (1971).https://doi.org/PYLBAJ

More about the Authors

V. I. Luschikov. Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, USSR.