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Search for free neutron-antineutron oscillations |
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| Authors: | G Bressi E Calligarich M Cambiaghi R Dolfini M Genoni A Gigli Berzolari A Lanza G Liguori F Mauri A Piazzoli S P Ratti P Torre C Bini M Conversi G De Zorzi P Gauzzi F Massa D Zanello R Cardarelli R Santonico D Scannicchio M Terrani |
| Institution: | 1. Dipartimento di Fisica Nucleare e Teorica, Universita' di Pavia, and INFN Sezione di Pavia, Italy 2. Dipartimento di Fisica, Universita' “La Sapienza”, Roma 3. INFN Sezione di Roma, Italy 4. Dipartimento di Fisica, Universita' “Tor Vergata”, Roma, Italy 5. Istituto di Matematica e Fisica, Universita' di Sassari and INFN Sezione di Pavia, Italy 6. Centro Studi Esperienze E. Fermi, Politecnico di Milano, and INFN Sezione di Pavia, Italy |
| 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. |
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