Energy dependence of exotic nuclei production cross sections by photofission reaction in GDR range

Bhowmick, Debasis; Khan, Farha; Atta, Debasis; Basu, Debabrata

doi:10.1139/cjp-2015-0634

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Among three, photo-fission [5] has been found more promising for having better thermal management and being a cold process creates higher yields for n-rich nuclei as compared to light ion induced fission except in the mass range of 110 < A < 125. Therefore there is a renewed interest presently to go for photo-fission [6] using e-LINAC as a primary accelerator to produce energetic photons in the Giant Dipole Resonance (GDR) region [7,8]. The Advanced Rare IsotopE Laboratory (ARIEL) [9,10] at TRIUMF, JINR, Dubna [11] and at ALTO, IPN, Orsay [12] are the laboratories, where initiative have already been taken.…”

Section: Introductionmentioning

confidence: 99%

Comparison of yields of neutron-rich nuclei in proton- and photon-induced U238 fission

et al. 2016

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A comparative study of fission of actinides specially 238 U, by proton and bremsstrahlung photon is performed. Relative mass distribution of 238 U fission fragments have been explored theoretically for both proton and photon induced fission. The integrated yield along with charge distribution of the products are calculated to find out the neutron richness in comparison to the nuclei produced by r-process in nucleosynthesis. Some r-process nuclei in intermediate mass range for symmetric fission mode are found to be produced almost two order of magnitude more for proton induced fission than photofission, although rest of the neutron rich nuclei in the asymmetric mode are produced in comparable proportion for both the processes.

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Section: Introductionmentioning

confidence: 99%

Comparison of yields of neutron-rich nuclei in proton- and photon-induced U238 fission

et al. 2016

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Estimating the photo-fission yield of the Trinity Test

Khan¹

2020

Sci Rep

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Estimating the photo-fission yield of the Trinity Test f. A. Khan in the Trinity Test, the energy was released not only from the fission of Pu-239 core but also from the fast neutron fission of tamper surrounding it. The high energy photons produced from the fissioning core can also induce fission in U-238 tamper. In this work, an effort has been made, for the first time, to develop an approach to investigate the possibility of photon-induced fission in U-238 tamper used in Trinity Test nuclear weapon. GEF nuclear reaction code, version 2018/1.1 is used to calculate the prompt γ-spectrum from the fast fission of Pu-239 core of the device. It is estimated that 14.5 ton (t) of TNT of the total 21 kT yield of the Trinity nuclear device is contributed by the photo-fission of U-238 tamper. When the first nuclear device, called the Gadget, was tested in 1945, there were several comments regarding the amount of energy released in the test. The device worked on the fission induced by fast neutrons (E ~ MeV) and so do all the modern nuclear devices. Its design, except some minor changes, was the same as that of the one used on Nagasaki-an implosion-type plutonium based device 1 , using 6.19 kg of highly enriched plutonium 2. Only when the photographs of the Trinity Test fireball, taken by Julian Mack and his team, were declassified, the British physicist Sir G. I. Taylor studied the problem of nuclear explosion in detail and obtained the expression for the energy released. He gave two values of yield as 16.8 kT and 23.7 kT 3,4. The energy released from the Trinity Test nuclear device was not only from the neutron-induced fission of Pu-239, but also from the fission of U-238 tamper by fast neutrons (E ~ MeV) released from the Pu-239 fissioning core 5. A tamper is a heavy material surrounding the fissile material core, that not only reduces its critical mass, when added sufficiently, by reflecting neutrons back to the fissioning core, but also retards the inevitable expansion of the core, allowing more time for fissions to occur until the core density drops to the value where criticality no longer holds. In Gadget, the plutonium core, besides highly explosive chemicals, was wrapped by about 120 kg natural uranium tamper 5. In addition to other forms of energy, the fissioning core also releases fast neutrons and prompt γs. So, keeping in view the formation of γs, it becomes interesting to study whether there is any contribution in the energy released from the γ-induced fission of U-238 tamper. While looking for the literature relevant to the γ-induced fission of U-238 etc. tamper in a nuclear device, I have not come across any research article. In the present work, an approach is developed to investigate the possibility of photon-induced fission of U-238 tamper generated by the fission of Pu-239 core of the Trinity nuclear device. U-238 nuclei can undergo fission by such photons, particularly in the Giant Dipole Resonance (GDR) energy region 6. Here, GEneral Fission (GEF) nuclear reaction code 7-9 is used to calculate the pr...

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Energy Dependence of the Most Stable Nuclei Production in Proton-Induced 238U and 232Th Fission

Khan¹

2019

Phys. Atom. Nuclei

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Energy dependence of exotic nuclei production cross sections by photofission reaction in GDR range

Cited by 3 publications

References 30 publications

Comparison of yields of neutron-rich nuclei in proton- and photon-induced U238 fission

Comparison of yields of neutron-rich nuclei in proton- and photon-induced U238 fission

Estimating the photo-fission yield of the Trinity Test

Energy Dependence of the Most Stable Nuclei Production in Proton-Induced 238U and 232Th Fission

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