Scission point model for the mass distribution of ternary fission

Karthika, C.; Balasubramaniam, M.

doi:10.1140/epja/i2019-12729-y

Cited by 18 publications

(10 citation statements)

References 42 publications

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“…Further, secondary maxima is observed for the fragmentation of Br + Cs + α. But, Sn + Zr was observed as the probable fragment pairs in the α-accompanied fission of 236 U * [13]. It is planned to include the effect of channel temperature satisfying energy balance conditions within the TRMF formalism.…”

Section: Ternary Yield Distribution Of 236 U * Using Trmfmentioning

confidence: 99%

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T-dependent RMF Model Applied to Ternary Fission Studies

Kokila

Karthika

Balasubramaniam

2021

J. Nucl. Phy. Mat. Sci. Rad. A.

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Ternary decay is comparatively a rare phenomenon. The yield distribution for the thermal neutroninduced fission of 236U was investigated within the Temperature-dependent Relativistic Mean Field (TRMF) approach and statistical theory. Binding energy obtained from TRMF for the ground state and at a specific temperature is used to evaluate the fragment excitation energy, which is needed to calculate the nuclear level density. Using the ternary convolution, the yield for α-accompanied fission of 236U* is calculated. Initial results are presented which shows a maximum yield for the fragment pair Tc + Ag +α. Further, the ternary pre-existence probability for the spontaneous fission of 236U was studied considering fixed third fragments of α,10Be and 14C using the area of the overlapping region. No significant change in the yield distribution was observed when fragment deformations are considered. However, the heavy group for the probable pair remains as 132Sn with a change in mass number of the lighter fragment.

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Section: Ternary Yield Distribution Of 236 U * Using Trmfmentioning

confidence: 99%

“…Vijayaraghavan et al [11] also used the potential energy surface to study the fragment arrangements for the ternary fragmentation of 252 Cf. One of the authors has studied the binary [12] and ternary mass distribution [13] for the thermal neutron-induced fission of 236 U within the dynamical and scission point model respectively.…”

Section: Introductionmentioning

confidence: 99%

T-dependent RMF Model Applied to Ternary Fission Studies

Kokila

Karthika

Balasubramaniam

2021

J. Nucl. Phy. Mat. Sci. Rad. A.

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“…We assume that the relevant fragment distribution, including the two large fragments as well as the light clusters or correlations, are already formed at the scission point, as also known from the scission point yield (SPY) model, see, e.g., [36][37][38][39][40] for recent related work. Hartree-Fock-Bogoliubov and related mean-field calculations have been performed for fission.…”

Section: External Mean-field Potentialmentioning

confidence: 99%

“…For simplicity we assume the symmetric case where 252 Cf decays into two fragments approximately 124 48 Cd (in general, asymmetric decays occur. Experimentally, for 252 Cf, the highest yield values were found for 4 He + 101 Zr + 147 Ba, see [37]) and calculate the Woods-Saxon mean-field potentials according to [43…”

Section: External Mean-field Potentialmentioning

confidence: 99%

Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf

2020

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The yields of light elements ($$Z=1,2$$ Z = 1 , 2 ) obtained from spontaneous ternary fission of $$^{252}$$ 252 Cf are treated within a nonequilibrium approach, and the contribution of unstable nuclei and excited bound states is taken into account. These light cluster yields may be used to probe dense matter, and to infer in-medium corrections such as Pauli blocking which is determined by the nucleon density. Continuum correlations are calculated from scattering phase shifts using the Beth-Uhlenbeck formula, and the effect of medium modification is estimated. The relevant distribution is reconstructed from the measured yields of isotopes. This describes the state of the nucleon system at scission and cluster formation, using only three Lagrange parameters which are the nonequilibrium counterparts of the temperature and chemical potentials, as defined in thermodynamic equilibrium. We concluded that a simple nuclear statistical equilibrium model neglecting continuum correlations and medium effects is not able to describe the measured distribution of H and He isotopes. Moreover, the freeze-out concept may serve as an important ingredient to the nonequilibrium approach using the relevant statistical operator concept.

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“…The most widely used theoretical model to study mass yields is the statistical model which was founded by Fong and Wilkins [1,2]. This model has been developed in many branches, such as the Gaussian model [3,4] and modified scission point models [6][7][8][9][10][11][12][13]. The time-dependent model has been significantly developed by Randrup [14][15][16] and others [17][18][19][20][21][22] to predict the shape of mass yields (symmetric or asymmetric modes).…”

Section: Introductionmentioning

confidence: 99%

Deformation Parameters and Collective Temperature Changes in Photofission Mass Yields of Actinides Within the Systematic Statistical Scission Point Model

Kaldiani

2021

Front. Phys.

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The photofission fragment mass yields of actinides are evaluated using a systematic statistical scission point model. In this model, all energies at the scission point are presented as a linear function of the mass numbers of fission fragments. The mass yields are calculated with a new approximated relative probability for each complementary fragment. The agreement with the experimental data is quite good, especially with a collective temperature Tcol of 2 MeV at intermediate excitation energy and Tcol = 1 MeV for spontaneous fission. This indicates that the collective temperature is greater than the value obtained by the initial excitation energy. The generalized superfluid model is applied for calculating the fragment temperature. The deformation parameters of fission fragments have been obtained by fitting the calculated results with the experimental values. This indicates that the deformation parameters decrease with increasing excitation energy. Also, these parameters decrease for fissioning systems with odd mass numbers.

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Scission point model for the mass distribution of ternary fission

Cited by 18 publications

References 42 publications

T-dependent RMF Model Applied to Ternary Fission Studies

T-dependent RMF Model Applied to Ternary Fission Studies

Light element ($$Z=1,2$$) production from spontaneous ternary fission of $$^{252}$$Cf

Deformation Parameters and Collective Temperature Changes in Photofission Mass Yields of Actinides Within the Systematic Statistical Scission Point Model

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