Abstract
A search for free neutron-antineutron oscillations has been carried out at the Pavia Triga Mark II research reactor. A thin carbon target is crossed by a beam of thermal neutrons propagating in a 18.5 m long channel where the earth magnetic field is attenuated by a factor of 50. The total neutron current through the target is 3.2×1010 n/s. Possible antineutron annihilations are identified by a large track detector surrounding the target. A lower limit on the oscillation time of 4.7×105 s (90% C.L.) has been reached.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
G. Fidecaro et al.: Phys. Lett. 156B (1985) 122
R.N. Mohapatra, R.E. Marshak: Phys. Lett. 94B (1980) 183
G. Bressi et al.: The\(n\bar n\) oscillation experiment at the Triga Mark II reactor of the University of Pavia, ICOBAN'82 Pramana Suppl. (1982) p. 219;
G. Bressi et al.: Nucl. Instrum. Methods A261 (1987) 449;
G. Bressi et al.: Search for free neutron-antineutron oscillations, Contributed paper to the XXIV Intern. Conf. on High Energy Physics, Munchen, 1988 (to appear in the Proceedings);
Under contract n.2188-83-09-TL-ISP-I we acknowledge the rent of the installation of the ISPRA-CCR group at the Pavia reactor
G. Bonaschi et al.: Submitted to Nucl. Eng. Design
G. Bressi et al: Nucl. Instrum. Methods A253 (1986) 24
M. Tavani, D. Zanello: University of Rome Internal Report N.805 (1983)
M. Conversi: Suppl. Nuovo Cimento 3 (1973) 263; L. Federici, M. Nardi, F. Ceradini, M. Conversi: Nucl. Instrum. Methods 151 (1978) 103; M. Conversi, L. Federici: Nucl. Instrum. Methods 151 (1978) 93
R. Santonico, R. Cardarelli: Nucl. Instrum. Methods 187 (1981) 377; R. Cardarelli et al.: Nucl. Instrum. Methods A263 (1988) 20
F. Balestra et al.: Antiprotons-Neon annihilation at rest and at 607 MeV/c. CERN Int. Rep. CERN-EP/88-68 (1988). Submitted to Nucl. Physics
R. Ford, W. Nelson: SLAC-210 (1978)
G. Capon et al.: Frascati Internal Report LNF-70/13 (1970)
F. James, M. Roos: MINUIT CERN Progr. Lib. D506
H.B. Prosper: Nucl. Instrum. Methods A238 (1985) 500; H.B. Prosper: Phys. Rev. D37 (1988) 1153
Author information
Authors and Affiliations
Additional information
Partly supported by the Italian “Ministero della Pubblica Istruzione”
Marcello Conversi died on 27 September 1988. We dedicate this paper to his memory
Rights and permissions
About this article
Cite this article
Bressi, G., Calligarich, E., Cambiaghi, M. et al. Search for free neutron-antineutron oscillations. Z. Phys. C - Particles and Fields 43, 175–179 (1989). https://doi.org/10.1007/BF01588203
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01588203