Mass distribution in the quasi-mono-energetic neutron-induced fission of 232Th

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 50; no. 9
• Main Authors: Naik, H., Crasta, Rita, Suryanarayana, S. V., Prajapati, P. M., Mulik, V. K., Shivasankar, B. S., Jagadeesan, K. C., Thakare, S. V., Sharma, S. C., Goswami, A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-09-2014
• Subjects: Hadrons; Heavy Ions; Nuclear Fusion; Nuclear Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Regular Article - Experimental Physics; Giant Dipole Resonance; High Energy Phys; Excitation Energy; Symmetric Product; Neutron Energy
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/i2014-14144-4

.
The cumulative yields of various fission products in
232
Th(n, f) with average neutron energies of 6.35, 8.53 and 10.09 MeV have been determined using an off-line
-ray spectrometric technique. The neutron beam was produced from the
7
Li(p, n) reaction. From the cumulative fission yields, the mass chain yields were obtained by using charge distribution correction of medium energy. The peak-to-valley (
) ratio, the average value of light mass (
), heavy mass (
) and the average number of neutrons (
) at the three different neutron energies of the present work and at other energies from the literature in the
232
Th(n, f) reaction were obtained from the mass yield data. The present and the existing literature data in the
232
Th(n, f) reaction at various excitation energies were compared with similar data in the
238
U(n, f) reaction. The fine structure in the mass yield distribution was interpreted from the point of nuclear structure effect such as shell closure proximity and even-odd effect. The role of standard I and standard II asymmetric mode of fission was discussed. The different types of mass-yield distributions between
232
Th(n, f) and
238
U(n, f) reactions were explained from different types of the potential energy between the two fissioning systems. The role of excitation energy was also investigated.