Analysis of the cross section for 232Th photofission in the subbarrier energy region

Blokhin, A. I.; Soldatov, A. S.

doi:10.1134/s1063778809060039

Cited by 8 publications

(8 citation statements)

References 16 publications

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“…1. The values obtained from the TALYS calculations showed a similar structure, with slight differences in magnitude compared to the experimental values [75,[81][82][83][84]. The slight difference in magnitude was probably due to the use of the default parameters for fission barriers in the TALYS calculation.…”

Section: Calculation Of Excitation Energymentioning

confidence: 58%

“…The bremsstrahlung spectrum N(E e , E) corresponding to an incident electron energy (E e ) was calculated using EGS4 computer code [80], as is usually done [68][69][70][71][72][73][74]. The photo-fission cross-sections of 232 Th and 238 U in the sub-barrier region [81] and energy range of 5-18.3 MeV [82,83] are available. Similarly, the photo-fission cross-section of 240 Pu in the sub-barrier region [84] and energy range of 10-30 MeV [75] is also available.…”

Section: Calculation Of Excitation Energymentioning

confidence: 99%

See 1 more Smart Citation

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: 58%

Section: Calculation Of Excitation Energymentioning

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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“…The bremsstrahlung spectrum N (E e , E γ ) corresponding to an incident electron energy (E e ) was calculated using the EGS4 computer code [75] as usually performed [61][62][63][64][65][66][67]. The photofission cross sections of 232 Th in the sub-barrier region [76] and in the energy range of 5-18.3 MeV [77,78] are available. The available data on the photofission cross sections of 232 Th are inconsistent [76][77][78].…”

Section: A Calculation Of Excitation Energymentioning

confidence: 99%

“…The photofission cross sections of 232 Th in the sub-barrier region [76] and in the energy range of 5-18.3 MeV [77,78] are available. The available data on the photofission cross sections of 232 Th are inconsistent [76][77][78]. Thus, the photofission cross-section of 232 Th as a function of photon energy was calculated using the TALYS code version 1.2 [79].…”

Section: A Calculation Of Excitation Energymentioning

confidence: 99%

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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“…Neutron-induced fission measurements by Blons et al [11][12][13] indicated a shallow third minimum of less than 0.5 MeV in the 230,231,233 Th fission barriers. However a deep third minimum of ∼ 2 MeV in the 232 Th fission barrier was obtained by Blokhin and Soldatov [14] by analyzing photofission cross sections extracted from data obtained by unfolding bremsstrahlung beams [15]. In light of the experimental evidence of deep third minima in the fission barriers of U isotopes, older 232 Th photofission data [16] was reinterpreted by Thirolf et al [17] to tentatively show a ∼ 4 MeV deep third minimum, roughly equal in depth to the second minimum.…”

Section: Introductionmentioning

confidence: 89%

Near-barrier photofission in Th232 and U238

Silano

Karwowski

2018

Phys. Rev. C

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A study of photofission of 232 Th and 238 U was performed using quasi-monoenergetic, linearlypolarized γ-ray beams from the High Intensity γ-ray Source at Triangle Universities Nuclear Laboratory. The prompt photofission neutron polarization asymmetries, neutron multiplicities and the photofission cross sections were measured in the near-barrier energy range of 4.3-6.0 MeV. This data set constitutes the lowest energy measurements of those observables to date using quasimonoenergetic photons. Large polarization asymmetries are observed in both nuclei, consistent with the E1 excitation as observed by another measurement of this kind made in a higher energy range. Previous experimental evidence of a deep third minimum in the 238 U fission barrier has been identified as an accelerator-induced background.

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Analysis of the cross section for 232Th photofission in the subbarrier energy region

Cited by 8 publications

References 16 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

Near-barrier photofission in Th232 and U238

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