Experimental studies and cascade-exciton model analysis of negative pion induced fission in gold and bismuth

Yasin, Z.; Shahzad, M.I.; Qureshi, I. H.; Sher, G.; Peterson, R. J.

doi:10.1016/j.nuclphysa.2005.11.005

Cited by 14 publications

(24 citation statements)

References 24 publications

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“…A number of investigations were carried out on fission induced by pions of distinctive energies (80, 100, 500, 672, 1068 and 1665 MeV) in different targets from Fe to U, for example [45][46][47][48][49][50][51]. Exposures were made at Brookhaven National Laboratory, US.…”

Section: Pion Induced Nuclear Reactionsmentioning

confidence: 99%

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Research and applications of nuclear tracks: Developments in Pakistan and global comparison

Rana¹

2012

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The present paper describes the development and applications of nuclear track detection technique in Pakistan. Pakistan entered in the field of nuclear tracks in early 1970s when it was still quite new. Highlights of successes of different Pakistani laboratories, working on nuclear tracks, achieved on their own or in collaboration with similar centers in the world are described briefly. The robust features of this investigation are the comprehensive investigation of the addressed research, analysis and review of results, and discussions with the perspectives of applications and new research directions. Further analysis of the published results by the present author and some new results are also presented. This paper portrays a comprehensive picture of the nuclear track detection research and technology in Pakistan and can be useful for a similar development in any country around the globe

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Section: Pion Induced Nuclear Reactionsmentioning

confidence: 99%

“…Explanatory details of these studies are given Khan et al [47] and Peterson et al [48]. Yasin et al [49] have compared experimentally measurements of negative pion induced fission cross sections of gold and bismuth targets in previous studies with corresponding calculations using the code CEM95 [54,55].…”

Section: Pion Induced Nuclear Reactionsmentioning

confidence: 99%

Research and applications of nuclear tracks: Developments in Pakistan and global comparison

Rana¹

2012

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“…Solid circles are the data for negative-pion-induced fission from Ref. [7], stars from Ref. [8] and open circles from Refs.…”

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confidence: 99%

Comparison of Fission Induced by Protons and Pions

Yasin

Shahzad

2011

Chinese Phys. Lett.

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We compare the properties of fission induced by protons and pions. Three different methodologies are used to make this comparison. First, it is shown that pion-induced fission cross sections are not much different in magnitude from proton-induced fission cross sections at the same beam kinetic energy. Secondly, across the pion-nucleon (3,3) resonance so prominent with free nucleons, it has been observed that there is no significant change in the reaction mechanism in the case of pions. Thirdly, it is noted that an empirical expression used for evaluations of proton-induced fission cross sections is also valid for positive pion-induced fission cross sections, at least for actinide nuclei. Fission cross sections computed using a cascade-exciton model code for 209 Bi and 238 U are also compared with the experimental data available.

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“…A modified version of CEM95 known as CEM98 has already been used to estimate the fission cross sections of different isotopes. [2] We have used CEM95 in its standard form to compare our experimental data of pion-induced fission in Au and Bi, [3] and for heavy targets. [4] In the present work, the approach is extended to neutrons and protons as projectile incidents on some selected targets which are considered to be useful materials for accelerator-driven systems.…”

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confidence: 99%

“…Recently, we have used standard CEM95 to compare our ex-perimentally determined fission cross sections of pion induced fission in Au and Bi. [3] There are a lot of parameters such as level density parameters, the microscopic and macroscopic fission barriers, ground state shell corrections, shell and pairing corrections at the saddle point, excitation energy dependence of fission barriers, angular momentum dependence of fission barriers and many others incorporated in CEM95. The most important parameter on which sensitivity of fission cross sections depend is the ratio of the level density parameters 𝑎 𝑓 and 𝑎 𝑛 corresponding to the saddle point of fission and equilibrium deformation of nucleus, respectively.…”

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Dependence of Nucleon and Pion-Induced Fission Cross Sections on the Level Density Parameter in the Cascade-Exciton Model

Yasin¹

2009

Chinese Phys. Lett.

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A new method is used to compute the fission cross sections in which a change of the ratio of the level density parameter in fission to neutron emission channels is taken into account with the change of the incident energy of the projectile. It is shown that fission cross sections induced by nucleons and pions depend on the ratio of the level density parameter in the fission and evaporation modes, i.e. 𝑎 𝑓 /𝑎𝑛, respectively. We are unable to describe well the cross sections for fission without using this new method. The computed values exhibit reasonable agreement with the experimental data found in the literature across a wide range of beam energies.

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Experimental studies and cascade-exciton model analysis of negative pion induced fission in gold and bismuth

Cited by 14 publications

References 24 publications

Research and applications of nuclear tracks: Developments in Pakistan and global comparison

Research and applications of nuclear tracks: Developments in Pakistan and global comparison

Comparison of Fission Induced by Protons and Pions

Dependence of Nucleon and Pion-Induced Fission Cross Sections on the Level Density Parameter in the Cascade-Exciton Model

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