Nuclear Pairing Energy of Transition NucleusPu240
- 20 October 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 174 (4), 1539-1544
- https://doi.org/10.1103/physrev.174.1539
Abstract
Fission-fragment angular distributions are measured for the fission of induced by monoenergetic neutrons of energies 150, 400, 475, 550, 600, 700, 800, 900, 1000, 1100, 1200, 1350, and 1500 keV (energy resolution, ±25 keV). Theoretical calculations are utilized to determine the parameter at each excitation energy from the observed angular distributions. The values of rise sharply from a value of 5-6, for neutron energies less than or equal to 600 keV, to an approximately constant value of 13, for neutron energies in the range 1.3-2.0 MeV. The break in the curve occurs at about 2.2 MeV above the fission threshold, and is interpreted as the beginning of two-quasiparticle excitations of the highly deformed transition nucleus . This result suggests that the pairing energy gap is increased for large nuclear deformations.
Keywords
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