The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm

Svirikhin, A.I and Andreev, A.V and Dushin, V.N and Chelnokov, M.L and Chepigin, V.I and Gupta, M and Isaev, A.V and Izosimov, I.N and Katrasev, D.E and Kuznetsov, A.N and Malyshev, O.N and Mullins, S and Popeko, A.G and Sokol, E.A and Yeremin, A.V (2012) The emission of prompt neutrons from the spontaneous fission of 252No and 244Fm. The European Physical Journal A, 48 (121). pp. 1-6. ISSN 1434-6001

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Abstract

The neutron detector with 3He-filled counters placed in the focal plane of the VASSILISSA separator is used for measuring the average number and determining the multiplicity distribution of prompt neutrons from the spontaneous fission of heavy short-lived isotopes. The test reaction 48Ca + 206Pb =2n+252No is used for tuning the separator settings and calibrating the detector system with the spontaneous fission of the 252No. The average neutron number per 252No spontaneous fission event is as large as ¯ν = 4.06 ± 0.12. The short-lived heavy isotope 244Fm, produced in the complete fusion reaction 40Ar + 206Pb, is investigated. The average number of neutrons per spontaneous fission of 244Fm from the experimental data (¯ν = 3.3 ± 0.3) is determined for the first time.

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