Cluster Radioactivity

Gupta, Raj K.; Greiner, Walter

doi:10.1142/s0218301394000127

Cited by 154 publications

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“…Also, it would be of interest if the statistical fission model, as introduced in the GEMINI code [1] could also be applied to the 58 Ni+ 58 Ni reaction and its predictions compared with the present cluster decay model results as well as to the pure Hauser-Feshbach BUSCO results. Furthermore, a similar comparison using the alternate picture as generalized liquid-drop model [12] or the so-called unified fission models for cluster decay studies [9] is called for since these models do not introduce any preformation factor. Fig.…”

Section: Summary and Discussionmentioning

confidence: 99%

Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Balasubramaniam

Kumar

Gupta

et al. 2003

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

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The complex fragments (or intermediate mass fragments) observed in the low-energy 58 Ni+ 58 Ni→ 116 Ba * reaction, are studied within the dynamical cluster decay model for s-wave with the use of the temperature-dependent liquid drop, Coulomb and proximity energies. The important result is that, due to the temperature effects in liquid drop energy, the explicit preference for α-like fragments is washed out, though the 12 C (or the complementary 104 Sn) decay is still predicted to be one of the most probable α-nucleus decay for this reaction. The production rates for non-α like intermediate mass fragments (IMFs) are now higher and the light particle production is shown to accompany the IMFs at all incident energies, without involving any statistical evaporation process in the model. The comparisons between the experimental data and the (s-wave) calculations for IMFs production cross sections are rather satisfactory and the contributions from other ℓ-waves need to be added for a further improvement of these comparisons and for calculations of the total kinetic energies of fragments.

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Section: Summary and Discussionmentioning

confidence: 99%

Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Balasubramaniam

Kumar

Gupta

et al. 2003

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

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“…Also, for the ground-state (T=0) decays, according to Eq. (8), E x = 0 (no particle or γ-ray emission), as is known to be true for exotic cluster radioactivity [21,38]. Thus, at temperature T, the preformation factor P 0 in Eq.…”

Section: The Dynamical Cluster Decay Model For Hot Compound Systemsmentioning

confidence: 99%

“…In this model, we treat the complex fragments (the IMFs or clusters) as dynamical collective mass motion of preformed fragments through the barrier. It is based on the well known dynamical (or quantum mechanical) fragmentation theory [26][27][28] developed for fission and heavy ion reactions, and used later for predicting the exotic cluster radioactivity [36][37][38] also. This theory is worked out in terms of the collective coordinates of mass asymmetry η = (A 1 − A 2 )/(A 1 + A 2 ) and relative separation R, which in a PCM allows to define the decay half-life T 1 2 , or the decay constant λ, as…”

Section: The Dynamical Cluster Decay Model For Hot Compound Systemsmentioning

confidence: 99%

Publisher’s Note: Cluster decay of hot56Ni⋆formed in the32
Gupta¹,
Kumar²,
Dhiman³
et al. 2003
Phys. Rev. C
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The decay of56 N i * , formed in 32 S + 24 M g reaction at the incident energies Ecm=51.6 and 60.5 MeV, is calculated as a cluster decay process within the Preformed Cluster-decay Model (PCM) of Gupta et al. re-formulated for hot compound systems. Interesting enough, the cluster decay process is shown to contain the complete structure of both the measured fragment cross sections and total kinetic energies (TKEs). The observed deformed shapes of the exit channel fragments are simulated by introducing the neck-length parameter at the scission configuration, which nearly coincides the 56 N i saddle configuration. This is the only parameter of the model, which though is also defined in terms of the binding energy of the hot compound system and the ground-state binding energies of the various emitted fragments. For the temperature effects included in shell corrections only, the normalized α-nucleus s-wave cross sections calculated for nuclear shapes with outgoing fragments separated within nuclear proximity limit (here ∼0.3 fm) can be compared with the experimental data, and the TKEs are found to be in reasonably good agreement with experiments for the angular momentum effects added in the sticking limit for the moment of inertia. The incident energy effects are also shown in predicting different separation distances and angular momentum values for the best fit. Also, some light particle production (other than the evaporation residue, not treated here) is predicted at these energies and, interestingly, 4 He, which belongs to evaporation residue, is found missing as a dynamical cluster-decay fragment. Similar results are obtained for temperature effects included in all the terms of the potential energy. The non-α fragments are now equally important and hence present a more realistic situation with respect to experiments. [2][3][4][5][6][7][8]). At such incident energies, the incident flux is found to get trapped by the formation of a compound nucleus (CN), which is in addition to a significant large-angle elastic scattering cross section. For lighter masses (A CN < 44), such a compound nucleus decays subsequently by the emission of mainly light particles (n, p, α) and γ-rays; i.e. with very small component of heavy fragment (A > 4) emission. An experimental measure of this so-called particle evaporation residue yield is the CN fusion cross section. For somewhat heavier systems, like 48 Cr and 56 N i, a significant decay strength to A > 4 fragments, the mass-asymmetric channels, is also observed which could apparently not arise from a direct reaction mechanism because of the large mass-asymmetry differences between the entrance and exit channels. The measured angular distributions and energy spectra are consistent with fission-like decays of the respective compound systems. PACSFor the 32 S + 24 M g → 56 N i * reaction, in one of the experiments, the mass spectra for A=12 to 28 fragments and the total kinetic energy (TKE) for only the most favoured (enhanced yields) α-nucleus fragments are measured at the energies E ...

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“…Thus, shell effects are contained in our calculations that come from the experimental and/or calculated binding energies. For ground state decays, =0 is a good approximation [11]. The penetrability P in Eq.…”

Section: The Preformed Cluster Model (Pcm)mentioning

confidence: 99%

“…In view of the excellent agreement [9,10] of PCM with the available [11,12] experimental data on cluster decays of heavy parent nuclei with Z=87 to 96, here in this work, half lives of isotopes of SHE element Z=115 have been predicted and compared with the existing [4,5] theoretical results to test the extent of validity of this formalism. Since the fragmentation process depends on the collective clusterization approach, in PCM, not only the shapes of parent, daughter and cluster are important but also of all other possible fragments anticipated in the decay.…”

Section: Introductionmentioning

confidence: 99%

Deformation and orientation effects in heavy-particle radioactivity of Z=115

Sawhney

Sandhu

Sharma

et al. 2015

EPJ Web of Conferences

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Abstract. The possibility of heavy particle radioactivity (heavier clusters) in ground state decays of 287−289 115 parent nuclei, resulting in a doubly magic daughter around 208 Pb is analyzed using Preformed Cluster Model (PCM) with choices of spherical and quadrupole deformation (β 2 ) having "optimum" orientations of decay products. The behavior of fragmentation potential and preformation probability is investigated in order to extract better picture of the dynamics involved. Interestingly, the potential energy surfaces obtained via the fragmentation process get modi¿ed signi¿cantly with the inclusion of deformation and orientation effects, which in turn inÀuence the preformation factor.

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Cluster Radioactivity

Cited by 154 publications

References 0 publications

Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Publisher’s Note: Cluster decay of hot56Ni⋆formed in the32
Gupta¹,
Kumar²,
Dhiman³
et al. 2003
Phys. Rev. C
Self Cite
12
4
33
0
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Deformation and orientation effects in heavy-particle radioactivity of Z=115

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Cluster Radioactivity

Cited by 154 publications

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Emission of intermediate mass fragments from hot116Ba* formed in low-energy58Ni +58Ni reaction

Emission of intermediate mass fragments from hot116Ba* formed in low-energy58Ni +58Ni reaction

Publisher’s Note: Cluster decay of hot56Ni⋆formed in the32Gupta1, Kumar2, Dhiman3 et al. 2003Phys. Rev. CSelf Cite124330View full textAdd to dashboardCite

Deformation and orientation effects in heavy-particle radioactivity of Z=115

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Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Emission of intermediate mass fragments from hot¹¹⁶Ba* formed in low-energy⁵⁸Ni +⁵⁸Ni reaction

Publisher’s Note: Cluster decay of hot56Ni⋆formed in the32
Gupta¹,
Kumar²,
Dhiman³
et al. 2003
Phys. Rev. C
Self Cite
12
4
33
0
View full text Add to dashboard Cite