Measurements of charge distributions of the fragments in the low energy fission reaction

Wang, Taofeng; Meng, Qingwei; Wang, Liming; Zhu, Liping; Haihong, Xia

doi:10.1016/j.nima.2012.08.109

Cited by 5 publications

(3 citation statements)

References 17 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique was applied to the thermal-neutron-induced fission of a number of suitable targets, which were mounted on the ILL high-flux reactor, see [236]. Recent attempts to develop COSI-FAN-TUTTE-like detector assemblies with higher detection efficiency and better resolution are presently being made, but have showed only limited success up to now [267][268][269][270][271]. In particular, the Z resolution is severely impeded by straggling phenomena.…”

Section: Boosting the Fission-fragment Kinetic Energiesmentioning

confidence: 99%

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

2018

View full text Add to dashboard Cite

An overview is given on some of the main advances in the experimental methods, experimental results, theoretical models and ideas of the last few years in the field of nuclear fission. New approaches have considerably extended the availability of fissioning systems for the experimental study of nuclear fission, and have provided a full identification of all fission products in A and Z for the first time. In particular, the transition from symmetric to asymmetric fission around Th, some unexpected structures in the mass distributions in the fission of systems around Z = 80-84, and an extended systematics of the odd-even effect in the fission fragment Z distributions have all been measured (Andreyev et al 2018 Rep. Prog. Phys. 81 016301). Three classes of model descriptions of fission presently appear to be the most promising or the most successful. Self-consistent quantum-mechanical models fully consider the quantum-mechanical features of the fission process. Intense efforts are presently being made to develop suitable theoretical tools (Schunck and Robledo 2016 Rep. Prog. Phys. 79 116301) for modeling the non-equilibrium, large-amplitude collective motion leading to fission. Stochastic models provide a fully developed technical framework. The main features of the fission-fragment mass distribution have been well reproduced from mercury to fermium and beyond (Möller and Randrup 2015 Phys. Rev. C 91 044316). However, limited computer resources still impose restrictions, for example, on the number of collective coordinates and on an elaborate description of the fission dynamics. In an alternative semi-empirical approach (Schmidt et al 2016 Nucl. Data Sheets 131 107), considerable progress in describing the fission observables has been achieved by combining several theoretical ideas, which are essentially well known. This approach exploits (i) the topological properties of a continuous function in multidimensional space, (ii) the separability of the influence of fragment shells and the macroscopic properties of the compound nucleus, (iii) the properties of a quantum oscillator coupled to a heat bath of other nuclear degrees of freedom, (iv) an early freeze-out of collective motion, and (v) the application of statistical mechanics for describing the thermalization of intrinsic excitations in the nascent fragments. This new approach reveals a high degree of regularity and allows the calculation of high-quality data that is relevant to nuclear technology without specifically adjusting the empirical data of individual systems.

show abstract

Section: Boosting the Fission-fragment Kinetic Energiesmentioning

confidence: 99%

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

2018

View full text Add to dashboard Cite

show abstract

“…Like several other earlier ionization-chamber based telescopes, we plan to use TFG-IC as an energy-loss (ΔE) detector in nuclear physics experiments to measure energy losses of charged particles emitted from incident ion beams or nuclear reactions [19,20]. The ERDA (elastic recoil detection analysis) system developed at the University of Tokyo was able to identify light ions of elements from Lithium (Li) to Fluorine (F) [21].…”

Section: Design Constraintsmentioning

confidence: 99%

New trapezoid-shaped Frisch-grid ionization chamber for low-energy particle measurements

et al. 2022

View full text Add to dashboard Cite

A new trapezoid-shaped Frisch-grid ionization chamber (TFG-IC) has been built as a part of a $$\varDelta {E}-E$$ Δ E - E telescope system for the detection and identification of charged particles at energies down to a few MeV. To study the effect of the drift electric field uniformity, two types of sealed windows, namely a pair of SSA (split-strip aluminized mylar film) and a pair of DSA (double-sided aluminized mylar film) sealed windows have been investigated. The detector’s performances were studied using a standard $$^{241}$$ 241 Am source at different gas pressures, and the total energy-deposit resolution achieved is about 1.1%(FWHM). The $$\varDelta {E}-E$$ Δ E - E telescope, which was composed of TFG-IC and a DSSSD (double-sided silicon strip detector), has been tested using a three-component $$\alpha $$ α source and the $$^{241}$$ 241 Am source under laboratory conditions. The results show that the energy resolution with the SSA sealed windows which provide uniform drift electric field has a smaller fluctuation than that with the DSA ones; the fluctuations are about 1% and 4% for the former and the latter, respectively. Simulations using the COMSOL software also confirmed the electric-field distortion at the edge of the detector with the DSA windows. A correlation curve between energy resolution and energy deposit of charged particles at various gas pressures and for two gas species is derived for TFG-IC with the SSA sealed windows using the measurement with the $$^{241}$$ 241 Am source. Incorporating the above results, we performed Monte Carlo simulations to evaluate the particle-identification capability of the telescope. The results show that the telescope can be extended to the identification of low-energy particles.

show abstract

“…[232]. Recent attempts for developing COSI-FAN-TUTTE -like detector assemblies with higher detection efficiency and better resolution are presently being made, but showed only limited success up to now [263,264,265,266,267].…”

Section: Boosting the Fission-fragment Kinetic Energiesmentioning

confidence: 99%

Review on the progress in nuclear fission

Schmidt,

Jurado

2018

Preprint

View full text Add to dashboard Cite

Measurements of charge distributions of the fragments in the low energy fission reaction

Cited by 5 publications

References 17 publications

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

Review on the progress in nuclear fission—experimental methods and theoretical descriptions

New trapezoid-shaped Frisch-grid ionization chamber for low-energy particle measurements

Review on the progress in nuclear fission

Contact Info

Product

Resources

About