Program - Brookhaven National Laboratory
Program - Brookhaven National Laboratory
Program - Brookhaven National Laboratory
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new covariance contributions to the decay heat uncertainties. The potential of using this method for more<br />
general inventory codes is then discussed.<br />
[1] A.J. Koning, D. Rochman, Ann. Nucl. Energy, 35, p. 2024 (2008) [2] N. García-Herranz, O. Cabellos,<br />
J. Sanz, J. Juan, J. C. Kuijper, Ann. Nucl. Energy, 35, p. 714-730 (2008) [3] M.F. James, R.W. Mills,<br />
D.R. Weaver, Prog. Nucl. Energy, 26, p. 1-29 (1991) [4] R.F. Burstall “FISPIN - A Computer Code for<br />
Nuclide Inventory Calculations”, UKAEA report ND-R-328(R) (1979)<br />
KD 2 2:00 PM<br />
Mass Yield Distribution in the 45- and 80-MeV Bremsstrahlung-Induced Fission of 232 Th<br />
H. Naik, A. Goswami<br />
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai -400085, India<br />
G. N. Kim, M.W. Lee, K.S. Kim<br />
Department of Physics, Kyungpook <strong>National</strong> University, Daegu 702-701 Republic of Korea<br />
S.V. Suryanarayana<br />
Nuclear Physics Division, Bhabha Atomic Research Centre , Mumbai -400085, India<br />
E.A. Kim, M.-H. Cho<br />
Division of Advanced Nuclear Engineering, Pohang University of Science and Technology, Pohang<br />
790-784, Republic of Korea<br />
The yields of various fission products in the 45- and 80-MeV bremsstrahlung-induced fission of 232 Th have<br />
been determined by off-line γ-ray spectrometry using the electron linac at Pohang Accelerator <strong>Laboratory</strong><br />
of Korea. The mass yield distributions were obtained from the fission yield data using charge distribution<br />
corrections. The peak to valley (P/V) ratio, average light mass (< AL >), heavy mass (< AH >) and<br />
neutron number (< ν >) at different excitation energy for 232 T h(γ, f) was obtained from the mass yield<br />
data of present and earlier work form literature and compared with the similar data in 232 Th(n, f). It was<br />
found that (i) the mass yield distribution in 232 T h(γ, f) is triple humped, similar to 232 T h(n, f). (ii) The<br />
yields of fission products around mass number 133-134, 139-140, 144-145 and their complementary products<br />
are higher compared to other fission products due to nuclear structure effect. (iii) With excitation energy,<br />
the yields of fission products for mass number 133-134 symmetric products increase, whereas it decreases<br />
for mass number 143-144. (iv) The yields of symmetric products increase and thus the P/V ratio decrease<br />
with excitation energy. However, it is surprising to see that the increase trend of symmetric products yields<br />
and decrease trend of P/V ratio for 232 T h(γ, f) and 232 Th(n, f) are not similar unlike in the fissioning<br />
systems 238 U(γ, f) and 238 U(n, f). (v) The < AL >, < AH > and < ν > at different excitation energy for<br />
232 T h(γ, f) and 232 T h(n, f) are similar unlike in the fissioning systems 238 U(γ, f) and 238 U(n, f), where<br />
they are different. This research partly was supported by the <strong>National</strong> Research Foundation of Korea<br />
(NRF) through a grant provided by the Korean Ministry of Education, Science & Technology (MEST) in<br />
2011 (Projects No. 2011-0006306 and No. 2011-0025762), by the World ClassUniversity (WCU) program<br />
(Grant No. R31-30005), and by the Institutional Activity <strong>Program</strong> of Korea Atomic Energy Research<br />
Institute.<br />
Corresponding author: Guinyun Kim<br />
KD 3 2:20 PM<br />
Independent Isotopic Product Yields in 25 MeV and 50 MeV Charged Particle Induced<br />
Fission of 238 U and 232 Th<br />
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