High-energy photofission of gold and uranium

doi:10.1016/0375-9474(72)90753-1

Nuclear Physics A

Volume 197, Issue 1, 11 December 1972, Pages 163-176

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Abstract

Bremsstrahlung induced photofission of ¹⁹⁷Au and ²³⁸U has been measured for energies E^max_γ = 0.8 to 2.2 GeV using catcher foil techniques. The mass distributions of the fission fragments of uranium were measured as a function of the maximum bremsstrahlung energy. The peak-to-valley and forward-backward ratios have been determined for ²³⁸U.

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Mass yield distribution in the 3 GeV bremsstrahlung induced fission of 232Th
2021, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Citation Excerpt :
This is because generation of high energy mono-energetic photons is a difficult task. The fission product yields in the 6.12–3500 MeV bremsstrahlung induced fission of 232Th [19–33] and 238U [20–22,28,31,34–51] are available in the EXFOR compilation [18]. From these data, a fine structure in the peak position of the mass yield distributions in the 6.12–80 MeV [30–32,51] bremsstrahlung induced fission of 232Th and 238U can be very well seen.
The cumulative yields of various fission products within the mass region of 77–153 in the 3-GeV bremsstrahlung induced fission of ²³²Th have been measured by using the method of recoil catcher and an off-line γ–ray spectrometry at the Pohang accelerator laboratory, Korea. The mass yields were obtained from the cumulative yields of fission products after charge-distribution corrections in the high energy fission. We obtained the mass distribution parameters such as peak-to-valley (P/V) ratio, average light mass ( $〈A_{L}〉$ ), and heavy mass ( $〈A_{H}〉$ ), as well as the average post-fission number of neutrons ( ${〈v〉}_{exp t}$ ) in the ²³²Th(γ,f) reactions. We compared the fission yield data in the ²³²Th(γ,f) and ²³⁸U(γ,f) reactions at various bremsstrahlung energies and the following facts were observed. (i) At the bremsstrahlung end-point energy of 2.0–3.5 GeV, the mass yield distribution in the ²³²Th(γ,f) reaction is triple humps, whereas in the²³⁸U(γ,f) reaction, it is double humps. This is due to the different type of potential energy surface between the two fissioning systems. (ii) In both the ²³²Th(γ,f) and ²³⁸U(γ,f) reactions, the yields of asymmetric products decrease marginally, whereas for those of symmetric products increase significantly with bremsstrahlung energy and thus the value of P/V ratio decrease accordingly. (iii) At all the bremsstrahlung energy, the P/V ratio of the ²³²Th(γ,f) reaction is lower than that of the ²³⁸U(γ,f) reaction due to the presence of the third peak in the mass yield distribution of former.
4He induced reactions on 45Sc at T(4He) = 150 MeV and on 238U, 197Au, 120Sn and 67Zn at T(4He) = 140 MeV
1979, Nuclear Physics, Section A
Yields of nuclei produced in the irradiation of ⁴⁵Sc with ⁴He particles of 150 MeV have been measured by the activation analysis technique. The experimental yields are compared with predictions from a Rudstam formula. The production of ²⁴Na is discussed and compared with results from proton, pion and photon induced reactions. The fission probabilities obtained by ⁴He induced fission are compared with published experimental values from other reactions and with liquid drop model (LDM) calculations. A fission-like process leading to the formation of ²⁴Na is considered. The isomeric yield ratio σ(^44mSc)/σ(^44gSc) is discussed. Fission cross sections have been measured and fission probabilities were determined for ²³⁸U, ¹⁹⁷Au, ¹²⁰Sn and ⁶⁷Zn nuclei irradiated with 140 MeV ⁴He particles.
Fission yields of 28 elements by bremsstrahlung photons of 1000 MeV maximum energy
1976, Nuclear Physics, Section A
Fission of gold induced by a coherent photon beam from 1 GeV electrons
1974, Physics Letters B
Bremsstrahlung induced nuclear reactions with E<inf>γ</inf>max = 450 MeV
1974, Nuclear Physics, Section A
The target nuclei ²⁷Al, ^{40, 44}Ca, ⁵¹V, ⁵⁹Co, ⁹³Nb, ^natAg, ¹⁸¹Ta and ¹⁹⁷Au were irradiated with bremsstrahlung of E_γ^max = 450 MeV. Protons, tritons, ³He and ⁴He particles were detected on-line with an identification system using surface barrier detectors. Energy spectra, yields and angular distributions are given. The energy spectra are compared with calculated spectra from the compound nucleus model.
Product yields for the photofission of 232Th, 234,238U, 237Np, and 239,240,242Pu actinides at various incident photon energies
2018, Nuclear Science and Techniques

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Nuclear Physics A

Abstract

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Cited by (22)

Mass yield distribution in the 3 GeV bremsstrahlung induced fission of <sup>232</sup>Th

<sup>4</sup>He induced reactions on <sup>45</sup>Sc at T(<sup>4</sup>He) = 150 MeV and on <sup>238</sup>U, <sup>197</sup>Au, <sup>120</sup>Sn and <sup>67</sup>Zn at T(<sup>4</sup>He) = 140 MeV

Fission yields of 28 elements by bremsstrahlung photons of 1000 MeV maximum energy

Fission of gold induced by a coherent photon beam from 1 GeV electrons

Bremsstrahlung induced nuclear reactions with E<inf>γ</inf><sup>max</sup> = 450 MeV

Product yields for the photofission of <sup>232</sup>Th, <sup>234,238</sup>U, <sup>237</sup>Np, and <sup>239,240,242</sup>Pu actinides at various incident photon energies