The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
H C Manjunatha - One of the best experts on this subject based on the ideXlab platform.
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competition between binary fission ternary fission cluster radioactivity and Alpha Decay of 281 ds
Journal of Radioanalytical and Nuclear Chemistry, 2020Co-Authors: N Sowmya, H C Manjunatha, N Dhananjaya, A M NagarajaAbstract:The competition between different Decay modes such as binary fission, ternary fission, cluster and Alpha Decay modes finds an important role in the synthesis of superheavy nuclei. The nuclei 281Ds is the most stable among the isotopes of Ds. We have studied the different Decay modes in superheavy nuclei 281Ds. It is observed that Alpha Decay half-lives are smaller compared to other modes. The Alpha Decay mode of 281Ds is observed with greater probability compared to binary fission.
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competition between different Decay modes of superheavy element z 116 and synthesis of possible isotopes
Brazilian Journal of Physics, 2019Co-Authors: N Sowmya, H C ManjunathaAbstract:We have predicted possible isotopes for Z = 116 by studying the competition between different Decay modes such as binary, ternary, cluster radioactivity, and Alpha Decay. The spontaneous fission is a dominant Decay mode for 274-276Lv and 295-339Lv; Alpha Decay is a prominent Decay mode for the nuclei 277-294Lv. In the second part, we have identified the most possible projectile-target combinations to synthesize the superheavy nuclei with Z = 116. We have also identified the most suitable projectile-target combinations to form compound nucleus with Z = 116 which are 36Ar + 248Cf, 36Ar + 249Cf, 36Ar + 250Cf, 36Ar + 251Cf, 36Ar + 252Cf, 36Ar + 253Cf, 37Ar + 253Cf, 38Ar + 253Cf, 39Ar + 253Cf, 40K + 253Bk and, 40K + 254Bk. We also identified the most probable spontaneous fission fragments after Alpha Decay chains of 284-294Lv.
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search for possible fusion reactions to synthesize the superheavy element z 121
Physical Review C, 2018Co-Authors: H C Manjunatha, K. N. Sridhar, H. B. RamalingamAbstract:We have studied the $\ensuremath{\Alpha}$-Decay properties of superheavy nuclei $Z=121$ in the range $265\ensuremath{\le}A\ensuremath{\le}316$. A detailed study of competition between $\ensuremath{\Alpha}$ Decay and fission enables us to identify the possible isotopes for superheavy element $Z=121$. The nuclei $^{299--304}121$ were found to have long half-lives and hence they could be detected if synthesized in a laboratory. After identifying the possible isotopes, we have identified the most probable projectile-target combinations by studying the fusion cross section, evaporation residue cross section, compound nucleus formation probability (${P}_{\mathrm{CN}}$), and survival probability (${P}_{\mathrm{Surv}}$) of different projectile-target combinations to synthesize the superheavy element $Z=121$. The most probable projectile-target combinations to synthesize the superheavy nuclei $^{299--305}121$ is $\mathrm{V}+\mathrm{Cf}$. The predicted $\ensuremath{\Alpha}$-Decay half-lives and projectile-target combinations play a vital role in the synthesis of the superheavy element $Z=121$.
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competition between spontaneous fission ternary fission cluster Decay and Alpha Decay in the super heavy nuclei of z 126
Nuclear Physics, 2018Co-Authors: H C Manjunatha, N SowmyaAbstract:Abstract Super heavy nuclei may Decay through the different Decay modes such as spontaneous fission, ternary fission and cluster Decay. There is a need to study the different Decay modes such as spontaneous fission, ternary fission and cluster Decay of super heavy nuclei. We studied the spontaneous fission, ternary fission and cluster Decay of predicted isotopes of super heavy nuclei for Z = 126 and compared with that of Alpha Decay. This enables to study the competition between spontaneous fission, ternary fission, cluster Decay and Alpha Decay in the super heavy nuclei of Z = 126 . The comparison of half lives for different Decay modes reveals that Alpha Decay is having smaller half lives than the other studied Decay modes. A detailed study of branching ratio of Alpha Decay with respect to other Decay modes also confirms that Alpha Decay is most dominant Decay mode for the super heavy nuclei 318126, 319126, 320126 and 323 – 326 126 and hence these nuclei can be detected through the Alpha Decay mode only.
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new semi empirical formula for Alpha α Decay half lives of the heavy and superheavy nuclei
European Physical Journal A, 2017Co-Authors: H C Manjunatha, K. N. SridharAbstract:We have succesfully formulated the semi-empirical formula for $ \Alpha$ -Decay half-lives of heavy and superheavy nuclei for different isotopes of the wide atomic-number range 94 < Z < 136. We have considered 2627 isotopes of heavy and superheavy nuclei for the fitting. The value produced by the present formula is compared with that of experiments and other eleven models, i.e. ImSahu, Sahu, Royer10, VS2, UNIV2, SemFIS2, WKB. Sahu16, Densov, VSS and Royer formula. This formula is exclusively for heavy and superheavy nuclei. $ \Alpha$ -Decay is one of the dominant Decay mode of superheavy nucleus. By identifying the $ \Alpha$ -Decay mode superheavy nuclei can be detected. This formula helps in predicting the $ \Alpha$ -Decay chains of superheavy nuclei.
Wei Zuo - One of the best experts on this subject based on the ideXlab platform.
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calculation of Alpha Decay energies of superheavy nuclei in a hybrid method
Physical Review C, 2013Co-Authors: B Sun, C H Shen, Wei ZuoAbstract:A recent proposed method for Alpha-Decay energies (Q(Alpha)) [J. M. Dong, W. Zuo, and W. Scheid, Phys. Rev. Lett. 107, 012501 (2011)] can reproduce experimental data of superheavy nuclei (SHN) with an rms value of less than 100 keV. However, a sinusoid-like periodic deviation from experiments, which limits the accuracy in predictions, is observed when using different reference nuclei. In this paper, we have further extended this hybrid method, i.e., to predict Q(Alpha) of the as-yet-unobserved SHN with the help of known nuclei. It is found that the systematic deviation seen in the previous study is rooted in the nuclear mass model employed. By further analyzing the source of errors, different nuclear mass models are evaluated based on the same procedure.
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Alpha Decay for heavy nuclei in the ground and isomeric states
Nuclear Physics, 2010Co-Authors: Hongfei Zhang, Wei Zuo, J Dong, Y Z WangAbstract:The Alpha-Decay half-lives of nuclei in the ground states and Isomeric states have been calculated within the WKB approximation and Royer's formulas. The barrier in the quasimolecular shape path is determined within a generalized liquid drop model (GLDM). in which the centrifugal potential energy has been introduced to study the unfavored a-Decay The agreement between the calculated results and experimental data indicates the reliability of studying Alpha-Decay of isomeric states with the generalized liquid drop model We find that their is no significant difference of preformation probability between Isomeric states and the corresponding ground states generally in favored Alpha-Decay Additionally. we extended Royer's formulas by taking account of the role of centrifugal harrier to study the unfavored Alpha-Decay, and some predicts oil the a Decay half-lives of Isomers are made Finally. the effects of angular momontum transfer and Q(Alpha) on Alpha-Decay half-life have been discussed Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved
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α Decay half lives of new superheavy nuclei within a generalized liquid drop model
Physical Review C, 2006Co-Authors: Hongfei Zhang, Wei Zuo, G. RoyerAbstract:The \ensuremath{\Alpha} Decay half-lives of the recently produced isotopes of the 112, 114, 116 and 118 nuclei and Decay products have been calculated in the quasi-molecular shape path using the experimental ${Q}_{\ensuremath{\Alpha}}$ value and a Generalized Liquid Drop Model including the proximity effects between nucleons in the neck or the gap between the nascent fragments. Reasonable estimates are obtained for the observed \ensuremath{\Alpha} Decay half-lives. The results are compared with calculations using the Density-Dependent M3Y effective interaction and the Viola-Seaborg-Sobiczewski formulae. Generalized Liquid Drop Model predictions are provided for the \ensuremath{\Alpha} Decay half-lives of other superheavy nuclei using the Finite Range Droplet Model ${Q}_{\ensuremath{\Alpha}}$ and compared with the values derived from the VSS formulae.
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properties of the superheavy element 287 115 and its α Decay time
Physical Review C, 2005Co-Authors: Hongfei Zhang, Wei Zuo, Baoqiu ChenAbstract:The properties of nuclei belonging to the newly observed \ensuremath{\Alpha}-Decay chain starting from ${}^{287}115$ have been studied. The axially deformed relativistic mean field calculation with the force NL-Z2 has been performed in the blocked BCS approximation. Some ground state properties such as average binding energies, deformations, spins, and parities as well as $Q$ values of the \ensuremath{\Alpha} Decay for this Decay chain have been calculated and compared with known experimental data. Good agreement is found. The study of the single-particle spectrum in ${}^{287}115$ shows that after $Z=100$ the magic numbers appear at $Z=116,114$ and smaller gaps at $Z=(110),(106)$ and (122), (126), (128). For neutrons, the gaps appear at $N=174,(172),(168),(162),(160),(186)$. Because of the neutron-deficient character of superheavy nuclei, there is some probability that protons could be distributed at positive levels, which form the resonance continuum; this is worth further investigation. The \ensuremath{\Alpha}-Decay lifetimes in the ${}^{287}115$ Decay chain are evaluated by different formulas and compared with experimental data. The methods that give better agreement with the data are selected.
N Sowmya - One of the best experts on this subject based on the ideXlab platform.
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competition between binary fission ternary fission cluster radioactivity and Alpha Decay of 281 ds
Journal of Radioanalytical and Nuclear Chemistry, 2020Co-Authors: N Sowmya, H C Manjunatha, N Dhananjaya, A M NagarajaAbstract:The competition between different Decay modes such as binary fission, ternary fission, cluster and Alpha Decay modes finds an important role in the synthesis of superheavy nuclei. The nuclei 281Ds is the most stable among the isotopes of Ds. We have studied the different Decay modes in superheavy nuclei 281Ds. It is observed that Alpha Decay half-lives are smaller compared to other modes. The Alpha Decay mode of 281Ds is observed with greater probability compared to binary fission.
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competition between different Decay modes of superheavy element z 116 and synthesis of possible isotopes
Brazilian Journal of Physics, 2019Co-Authors: N Sowmya, H C ManjunathaAbstract:We have predicted possible isotopes for Z = 116 by studying the competition between different Decay modes such as binary, ternary, cluster radioactivity, and Alpha Decay. The spontaneous fission is a dominant Decay mode for 274-276Lv and 295-339Lv; Alpha Decay is a prominent Decay mode for the nuclei 277-294Lv. In the second part, we have identified the most possible projectile-target combinations to synthesize the superheavy nuclei with Z = 116. We have also identified the most suitable projectile-target combinations to form compound nucleus with Z = 116 which are 36Ar + 248Cf, 36Ar + 249Cf, 36Ar + 250Cf, 36Ar + 251Cf, 36Ar + 252Cf, 36Ar + 253Cf, 37Ar + 253Cf, 38Ar + 253Cf, 39Ar + 253Cf, 40K + 253Bk and, 40K + 254Bk. We also identified the most probable spontaneous fission fragments after Alpha Decay chains of 284-294Lv.
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competition between spontaneous fission ternary fission cluster Decay and Alpha Decay in the super heavy nuclei of z 126
Nuclear Physics, 2018Co-Authors: H C Manjunatha, N SowmyaAbstract:Abstract Super heavy nuclei may Decay through the different Decay modes such as spontaneous fission, ternary fission and cluster Decay. There is a need to study the different Decay modes such as spontaneous fission, ternary fission and cluster Decay of super heavy nuclei. We studied the spontaneous fission, ternary fission and cluster Decay of predicted isotopes of super heavy nuclei for Z = 126 and compared with that of Alpha Decay. This enables to study the competition between spontaneous fission, ternary fission, cluster Decay and Alpha Decay in the super heavy nuclei of Z = 126 . The comparison of half lives for different Decay modes reveals that Alpha Decay is having smaller half lives than the other studied Decay modes. A detailed study of branching ratio of Alpha Decay with respect to other Decay modes also confirms that Alpha Decay is most dominant Decay mode for the super heavy nuclei 318126, 319126, 320126 and 323 – 326 126 and hence these nuclei can be detected through the Alpha Decay mode only.
K. P. Santhosh - One of the best experts on this subject based on the ideXlab platform.
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theoretical studies on the Alpha Decay of 178 220pb isotopes
Nuclear Physics, 2015Co-Authors: K. P. Santhosh, Indu Sukumaran, B PriyankaAbstract:Abstract The α Decay half lives for the isotopes of Pb ( Z = 82 ) nuclei in the range 178 ≤ A ≤ 220 have been studied systematically within the Coulomb and proximity potential model (CPPM) and also within CPPM with modified deformation dependent assault frequency. The half-lives have been evaluated using the experimental Q values. The computed half-lives are compared with the experimental data and also with the existing theoretical models and are found in good agreement. Using our model we could also demonstrate the influence of the neutron shell closure ( N = 126 ) in the Alpha Decay half lives through the Geiger–Nuttall (GN) plots of ln λ vs. Z E − 1 / 2 , log 10 T 1 / 2 vs. Q − 1 / 2 and − ln P vs. Z Q − 1 / 2 . We have also studied the Universal curve of log 10 T 1 / 2 vs. − ln P , where all the Alpha transitions could be plotted as a single line. The study on the various forms of GN plots, with various variables, enabled us in developing a new, simple relation for the Alpha Decay half lives of the Pb isotopes and our study also revealed that CPPM and CPPM with the modified assault frequency are appropriate for the Alpha Decay studies of Pb isotopes and thus can be successfully applied to other Alpha emitter nuclides.
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Semi-empirical formula for spontaneous fission half life time
Nuclear Physics A, 2010Co-Authors: K. P. Santhosh, R. K. Biju, Sabina SahadevanAbstract:Abstract A new semi-empirical formula is proposed for determining the spontaneous fission half lives, which works well for the mass region from 232 Th to 286 114. The computed spontaneous fission half life times are also compared with other semi-empirical formula predictions. The Alpha Decay half lives are systematically computed for heavy and super heavy region with proton numbers varying from 90 ⩽ Z ⩽ 122 using Coulomb and Proximity Potential Model. The comparison between computed Alpha Decay half lives and the present spontaneous fission semi-empirical formula predictions of even–even isotopes with Z = 90 – 122 are studied. It is found that in super heavy region the isotopes 270–274 Ds, 272–278 112, 272–282 114, 274–292 116, 276–298 118, 276–308 120 and 278–314 122 will survive fission and can be synthesized and identified via Alpha Decay.
K. N. Sridhar - One of the best experts on this subject based on the ideXlab platform.
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search for possible fusion reactions to synthesize the superheavy element z 121
Physical Review C, 2018Co-Authors: H C Manjunatha, K. N. Sridhar, H. B. RamalingamAbstract:We have studied the $\ensuremath{\Alpha}$-Decay properties of superheavy nuclei $Z=121$ in the range $265\ensuremath{\le}A\ensuremath{\le}316$. A detailed study of competition between $\ensuremath{\Alpha}$ Decay and fission enables us to identify the possible isotopes for superheavy element $Z=121$. The nuclei $^{299--304}121$ were found to have long half-lives and hence they could be detected if synthesized in a laboratory. After identifying the possible isotopes, we have identified the most probable projectile-target combinations by studying the fusion cross section, evaporation residue cross section, compound nucleus formation probability (${P}_{\mathrm{CN}}$), and survival probability (${P}_{\mathrm{Surv}}$) of different projectile-target combinations to synthesize the superheavy element $Z=121$. The most probable projectile-target combinations to synthesize the superheavy nuclei $^{299--305}121$ is $\mathrm{V}+\mathrm{Cf}$. The predicted $\ensuremath{\Alpha}$-Decay half-lives and projectile-target combinations play a vital role in the synthesis of the superheavy element $Z=121$.
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new semi empirical formula for Alpha α Decay half lives of the heavy and superheavy nuclei
European Physical Journal A, 2017Co-Authors: H C Manjunatha, K. N. SridharAbstract:We have succesfully formulated the semi-empirical formula for $ \Alpha$ -Decay half-lives of heavy and superheavy nuclei for different isotopes of the wide atomic-number range 94 < Z < 136. We have considered 2627 isotopes of heavy and superheavy nuclei for the fitting. The value produced by the present formula is compared with that of experiments and other eleven models, i.e. ImSahu, Sahu, Royer10, VS2, UNIV2, SemFIS2, WKB. Sahu16, Densov, VSS and Royer formula. This formula is exclusively for heavy and superheavy nuclei. $ \Alpha$ -Decay is one of the dominant Decay mode of superheavy nucleus. By identifying the $ \Alpha$ -Decay mode superheavy nuclei can be detected. This formula helps in predicting the $ \Alpha$ -Decay chains of superheavy nuclei.