Measurement of photo-fission yields and photo-neutron cross-sections in 209Bi with 50 and 65 MeV bremsstrahlung

Naik, H.; Singh, Sadanand; Reddy, Α. V. R.; Manchanda, V. Κ.; Ganesan, S.; Raj, Devesh; Rahman, Md. Shakilur; Kim, K. S.; Lee, M. W.; Kim, G.; Oh, Y. D.; Lee, H. S.; Cho, M. H.; Ko, In Soo; Namkung, W.

doi:10.1140/epja/i2009-10812-8

Cited by 15 publications

(12 citation statements)

References 43 publications

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“…(1), the value of N(E e , E) from the EGS4 code [80] and σ F (E) from the TALYS code [85] were used to calculate the average excitation energy, as reported by us in the bremsstrahlunginduced fission of 209 Bi [86]. For the 10 MeV bremsstrahlung energy, the average excitation energies were found to be 7.35, 7.55 and 7.61 MeV for the fissioning systems 232 Th * , 238 U * and 240 Pu * , respectively.…”

Section: Calculation Of Excitation Energymentioning

confidence: 99%

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Mass distribution in the bremsstrahlung-induced fission of 232Th, 238U and 240Pu

Naik

Nimje²,

Raj³

et al. 2011

Nuclear Physics A

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Section: Calculation Of Excitation Energymentioning

confidence: 99%

“…From the number of γ -rays detected (N obs ) under the photo peak of each individual fission product, their cumulative yields (Y R ) relative to 135 I were calculated by using the standard decay equation [21,86] …”

Section: Calculation Of Yields Of Fission Products From the Photo-peamentioning

confidence: 99%

Mass distribution in the bremsstrahlung-induced fission of 232Th, 238U and 240Pu

Naik

Nimje²,

Raj³

et al. 2011

Nuclear Physics A

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“…In the present experiment, the electron linac was operated at 50, 60, and 70 MeV. The bremsstrahlung was produced when a pulsed electron beam hit a tungsten (W) target with a size of 100 × 100 mm and a thickness of 0.1 mm [74]. The W target was located at 18.0 cm from the beam exit window.…”

Section: Methodsmentioning

confidence: 99%

“…A thickness of 0.1 mm for the W target was chosen to avoid the production of neutrons. Then, a known amount (76.8-114.0 mg) of 232 Th metal foil with a 0.025mm thickness and with a 0.25-cm 2 area was wrapped with a 0.025-mm-thick aluminum foil with purity of more than 99.99% and was fixed on a stand in air at 12 cm from the W metal foil [74]. The aluminum wrapper foil acts as a catcher for the fission products recoiling out from the surface of the Th metal foil during the irradiation.…”

Section: Methodsmentioning

confidence: 99%

“…The irradiated target assembly was cooled for 10-30 min. Then, the 232 Th metal foil and the aluminum catcher were taken out from the irradiated assembly and were mounted separately on a Perspex plate (acrylic glass, 1.5-mm thick) [53,74]. The γ -ray counting of fission and reaction products was measured by using an energyand efficiency-calibrated HPGe detector coupled to a PC-based 4K channel analyzer.…”

Section: Methodsmentioning

confidence: 99%

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Mass distribution in the 50-, 60-, and 70-MeV bremsstrahlung-induced fission of232Th

Naik¹,

Nathaniel²,

Goswami³

et al. 2012

Phys. Rev. C

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The postneutron yields of various fission products in the mass regions of 77-153 have been determined in the 50-, 60-, and 70-MeV bremsstrahlung-induced fission of 232 Th by using a recoil catcher and an off-line γ -ray spectrometric technique in the electron linac at the Pohang Accelerator Laboratory, Korea. The mass-yield distributions were obtained from the fission-product yield data using charge-distribution corrections. The fission yields of the present paper and the existing data from the 232 Th(γ ,f ) reaction at various energies are compared with those from the 232 Th(n,f ), the 238 U(n,f ), and the 238 U(γ ,f ) reactions. We observe that the yields of fission products for A = 133-134, A = 138-139, A = 143-144, and their complementary products in the above fissioning systems are higher than those of other fission products, which is explained based on the nuclear-structure effect. However, we observed that the yields of fission products for A = 133-134 were lower than those for A = 143-144 in the 232 Th(γ ,f ) reaction compared to those of the 232 Th(n,f ), 238 U(n,f ), and 238 U(γ ,f ) reactions. The yields of fission products for A = 133-134 increase, but those for A = 143-144 decrease with an increase in the excitation energy in the 232 Th(γ ,f ) and 232 Th(n,f ) reactions; however, those trends are reversed in the 238 U(γ ,f ) and 238 U(n,f ) reactions. The increasing or decreasing trends for the yields of fission products for A = 133-134 and A = 143-144 with the excitation energy in the 232 Th(γ ,f ), 232 Th(n,f ), 238 U(n,f ), and 238 U(γ ,f ) reactions are explained from the shell effect of the complementary products based on the static scission-point model and the standard I and II channels of bimodal fission. The peak-to-valley (P/V) ratio for the above fissioning systems also was obtained from the mass-yield distribution. The P/V ratio for the 232 Th(γ ,f ) and 238 U(γ ,f ) reactions at different energies from the present data and the existing literature data are interpreted to examine the role of excitation energy.

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Mass–yield distributions of fission products from photo-fission of natPb induced by 50–70 MeV bremsstrahlung

Naik

Kim

Goswami

et al. 2009

J Radioanal Nucl Chem

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Measurement of photo-fission yields and photo-neutron cross-sections in 209Bi with 50 and 65 MeV bremsstrahlung

Cited by 15 publications

References 43 publications

Mass distribution in the bremsstrahlung-induced fission of 232Th, 238U and 240Pu

Mass distribution in the bremsstrahlung-induced fission of 232Th, 238U and 240Pu

Mass distribution in the 50-, 60-, and 70-MeV bremsstrahlung-induced fission of232Th

Mass–yield distributions of fission products from photo-fission of natPb induced by 50–70 MeV bremsstrahlung

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