Uncommon Modes of Particle-Accompanied Fission

Mutterer, M.; Kopatch, Yu. N.; Jesinger, P.; Gönnenwein, F.

doi:10.1142/9789812776723_0026

Cited by 6 publications

(11 citation statements)

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“…For example, the probability of ternary fission is about 1/260 (relative to binary fission) for Cf-252. The probability decreases when going to higher order fission modes (for quaternary fission is in the range of 10 −7 to 10 −6 ) [8]. For such rare events, the synchronization of devices is a good mechanism to filter useful events from a lot of unnecessary events.…”

Section: Resultsmentioning

confidence: 99%

“…Despite intensive past studies in nuclear fission processes, there are still many which are just partially studied. Rare fission mode processes, as well as the ternary and quaternary fission [6][7][8], are the nuclear fission processes which are nowadays in focus of further studies. Knowing these processes better allows learning more about energetics and dynamics of the fission process at scission.…”

Section: Introductionmentioning

confidence: 99%

“…Knowing these processes better allows learning more about energetics and dynamics of the fission process at scission. In ternary fission, the two fission fragments are accompanied by a Light Charged Particle (LCP) [6,8]. In quaternary fission, however, the two fission fragments are accompanied by the independent emission of two LCPs [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In ternary fission, the two fission fragments are accompanied by a Light Charged Particle (LCP) [6,8]. In quaternary fission, however, the two fission fragments are accompanied by the independent emission of two LCPs [6][7][8]. Long-term experiments are needed for a profound study of rare fission mode processes due to their low probabilities.…”

Section: Introductionmentioning

confidence: 99%

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A synchronization and data acquisition system for silicon detectors

et al. 2018

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A dedicated synchronization bus has been developed and integrated into the FITPix COMBO device. It can be used as Timepix read-out (involving back-side-pulse acquisition) or as a simple spectrometer device -Spectrig (when an external single pad sensor is connected, e.g. ∆E detector). The synchronization bus permits the implementation of a system of up to 32 distinct devices running in clock locked mode while the absolute value of the timestamp is distributed to all devices in the system. Any combination of Timepix or spectrometer devices (up to 32) can be connected-up to create a final measurement set-up. The synchronization bus has also been designed to control a trigger signal and busy signal to allow an effective filtration of unpaired events when coincidence measurement is performed. The system has been tested with a ∆E−E telescope consisting of a thin detector and Timepix. The thin detector has been used for ∆E and the Timepix detector for E measurements. The ∆E detector has an area of 10 × 10 mm 2 and a thickness of 12 µm with non-uniformity of 8%. The area and thickness of Timepix are 14 × 14 mm 2 and 300 µm, respectively. The detection system can provide simultaneous information about position, 1Corresponding author.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A synchronization and data acquisition system for silicon detectors

et al. 2018

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“…The first direct observation of the cold binary fission of 252 Cf was reported at Oak Ridge National Laboratory [5,6]. In the last years several experimental groups evidenced the ternary fission process of 252 Cf, where the third emitted light cluster is an α-particle [7], 10 Be or 14 C [8][9][10][11][12]. Very recently, a new experiment was performed within the Vanderbilt-Berkeley-Dubna collaboration [13] allowing the measurement of the averaged energy and angular distribution of light clusters, emitted in the ternary fission of 252 Cf.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent description of the ternary cold fission: tri-rotor mode

Delion

Săndulescu²,

Greiner

2002

J. Phys. G: Nucl. Part. Phys.

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We give a quantum description of the ternary cold fission process within a stationary scattering formalism. The dynamics of the light particle and heavy fragments is described by a self-consistent system of equations for radial wavefunctions. We consider the spontaneous cold ternary fission of 252Cf accompanied by 4He and 10Be. The light cluster decays from some resonant eigenstate in the Coulomb plus nuclear potential. It turns out that for the angular momentum projection K = 0 the light cluster emission is concentrated in the polar direction. By increasing K the maximum of the angular distribution moves towards the equator, as measured in the experiment. For 4He we predict short living decaying states. Due to a large repulsive core, proportional to K2, such states are hindered in the case of 10Be. The motion of the two heavy fragments with −K compensates the rotation of the light fragment. We call this collective motion tri-rotor mode and it should be detected in the fragment yields by magnetic transitions.

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Gamma-ray multiplicity distribution in ternary fission of²⁵²Cf

Jändel

Kliman

Крупа

et al. 2002

J. Phys. G: Nucl. Part. Phys.

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From multiparameter data obtained at Lawrence Berkeley National Laboratory, the integral characteristics of the prompt γ-ray emission were extracted for tripartition of 252Cf with He, Be and C being the third light charged particle. We used multifold γ-ray coincidence spectra for the determination of γ-ray multiplicities assuming a Gaussian distribution for γ-ray multiplicity. The multiplicity distribution characteristics, i.e. mean multiplicity and its dispersion were obtained by minimizing with respect to the calculated values of probabilities of multifold γ-ray coincidences using a combinatoric method. Comparison with the known experimental data from binary fission was made. Further, we investigated dependencies of the mean γ-ray multiplicity on the kinetic energy of the light charged particle. The mean γ-ray multiplicity for He ternary fission is found to increase rapidly with increasing kinetic energy of He in the region less than 11 MeV and then decrease slowly with increasing kinetic energy of He. The anomalous behaviour of γ-ray emission is discussed. The mean γ-ray multiplicity was determined for the first time for Be and C ternary fission. For Be, the γ-ray multiplicity as a function of kinetic energy was obtained as well.

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Uncommon Modes of Particle-Accompanied Fission

Cited by 6 publications

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A synchronization and data acquisition system for silicon detectors

A synchronization and data acquisition system for silicon detectors

Self-consistent description of the ternary cold fission: tri-rotor mode

Gamma-ray multiplicity distribution in ternary fission of²⁵²Cf

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Uncommon Modes of Particle-Accompanied Fission

Cited by 6 publications

References 0 publications

A synchronization and data acquisition system for silicon detectors

A synchronization and data acquisition system for silicon detectors

Self-consistent description of the ternary cold fission: tri-rotor mode

Gamma-ray multiplicity distribution in ternary fission of252Cf

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Gamma-ray multiplicity distribution in ternary fission of²⁵²Cf