Cluster Radioactivity

Poenaru, D. N.; Greiner, Walter

doi:10.1007/978-3-642-13899-7_1

Cited by 54 publications

(50 citation statements)

References 97 publications

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“…[8] and the more recent surveys in Refs. [9][10][11]. In binary fission the occurrence of several decay modes is referred to as bimodal or multi-modal fission [3].…”

Section: Binary and Ternary Fission Of 252 Cfmentioning

confidence: 99%

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

2015

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We discuss the multiple decay modes of collinear fission in 252 Cf(sf, fff), with three fragments as suggested by the potential energy surface (PES). Fission as a statistical decay is governed by the phase space of the different decay channels, which are suggested in the PES-landscape. The population of the fission modes is determined by the minima in the PES at the scission points and on the internal potential barriers. The ternary collinear decay proceeds as a sequential process, in two steps. The originally observed ternary decay of 252 Cf(sf) into three different masses (e.g. 132-140 Sn, 52-48 Ca, 68-72 Ni), observed by the FOBOS group in the FLNR (Flerov Laboratory for Nuclear Reactions) of the JINR (Dubna) the collinear cluster tripartition (CCT), is one of the ternary fission modes. This kind of "true ternary fission" of heavy nuclei has often been predicted in theoretical works during the last decades. In the present note we discuss different ternary fission modes in the same system. The PES shows pronounced minima, which correspond to several modes of ternary fragmentations. These decays have very similar dynamical features as the previously observed CCT-decays. The data obtained in the experiments on CCT allow us to extract the yields for different decay modes using specific gates on the measured parameters, and to establish multiple modes of the ternary fission decay.

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“…[8] and the more recent surveys in Refs. [9][10][11]. In binary fission the occurrence of several decay modes is referred to as bimodal or multi-modal fission [3].…”

Section: Binary and Ternary Fission Of 252 Cfmentioning

confidence: 99%

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

2015

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“…A truly universal formula, valid for the radioactivity of all clusters, including α particles was given by Qi et al, [25,26] on the basis of the microscopic mechanism of the charged particle emission. Since 1984, the Analytical Superasymmetric Fission Model (ASAFM) have been successfully used [27,28] to compute half life for alpha and cluster radioactivity in heavy and superheavy nuclides. Recently Poenaru et al, [24] have changed the concept of heavy-particle radioactivity (HPR) to allow emitted particles with Z e > 28 from parents with Z > 110 and daughter around by the authors gave an unexpected result that, for some of the SH nuclei, cluster decay dominates over α decay.…”

Section: Introductionmentioning

confidence: 99%

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Santhosh

Priyanka

2014

Nuclear Physics A

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Abstract.The feasibility for the alpha decay and the heavy particle decay from the even-even superheavy (SH) nuclei with Z = 116-124 have been studied within the Coulomb and proximity potential model (CPPM). The Universal formula for cluster decay (UNIV) of Poenaru et al., the Universal Decay Law (UDL) of Qi et al., and the Scaling Law of Horoi et al., has also been used for the evaluation of the decay half lives. A comparison of our predicted half lives with the values evaluated using these empirical formulas are in agreement with each other and hence CPPM could be considered as a unified model for alpha and cluster decay studies. The spontaneous fission half lives of the corresponding parents have also been evaluated using the semi-empirical formula of Santhosh et al. Within our fission model, we have studied cluster formation probability for various clusters and the maximum cluster formation probability for the decay accompanying 298 114 reveals its doubly magic behavior. In the plots for log 10 (T 1/2 ) against the neutron number of the daughter in the corresponding decay, the half life is found to be the minimum for the decay leading to 298 114(Z = 114, N = 184) and this also indicate its doubly magic behavior. Most of the predicted half lives are well within the present upper limit for measurements ) 10 ( 30 2 / 1 s T < and the computed alpha half lives for 290,292 116 agrees well with the experimental data. We have thus confidently indicate towards a new island for the cluster radioactivity around the superheavy isotope 298 114 and its neighbors and we hope to receive experimental information about the cluster decay half lives of these considered SHs', hoping to confirm the present calculations.

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“…Our study may further suggest that, for proton emitters like 166 Ir, when the electric field is strong, the dominant decay mode could be changed from α decay to proton emission. As high-frequency alternative electric fields correspond to high-frequency laser fields in the dipole approximation, our study could be viewed as a benchmark for future theoretical studies of charged particle emissions in realistic laser fields.Recent years witness great progress in studying proton emission, α decay, and cluster radioactivity [1][2][3][4]. Historically, modern theoretical nuclear physics originates from the explanation of α decay by Gamow, Gurney and Condon in 1928 [5, 6].…”

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confidence: 99%

Charged particle emissions in high-frequency alternative electric fields

2018

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Proton emission, α decay, and cluster radioactivity play an important role in nuclear physics.We show that high-frequency alternative electric fields could deform Coulomb barriers that trap the charged particle, and raise the possibility of speeding up charged particle emissions. They could also cause anisotropic effects in charged particle emissions, and introduce additional terms in the Geiger-Nuttall laws. Our study may further suggest that, for proton emitters like 166 Ir, when the electric field is strong, the dominant decay mode could be changed from α decay to proton emission. As high-frequency alternative electric fields correspond to high-frequency laser fields in the dipole approximation, our study could be viewed as a benchmark for future theoretical studies of charged particle emissions in realistic laser fields.Recent years witness great progress in studying proton emission, α decay, and cluster radioactivity [1][2][3][4]. Historically, modern theoretical nuclear physics originates from the explanation of α decay by Gamow, Gurney and Condon in 1928 [5, 6]. Interests in alpha decay persist after that, and lots of interesting results have been obtained . Later discoveries of proton emission in the 1960s [37,38] and cluster radioactivity in the 1980s [39,40] also make important contributions to deepening our understanding of nuclei lying near the border of nuclear stability. Recently, it is pointed out by Ref. [41][42][43][44][45][46][47] that, α decay, proton emission, and cluster radioactivity could be described systematically using unified decay rules. For a pedagogic introduction to charged particle emissions, we would like to recommend Ref. [1]. In the last few years, several works [50][51][52][53][54][55][56] are devoted to α decay in strong electromagnetic fields, partially inspired by the upcoming powerful laser facilities in the near future [48, 49]. These studies provide some preliminary hints that strong laser fields could speed up α decays. This is not only interesting from the pure academic viewpoint, but also might be helpful for decontaminating α-radioactive nuclear wastes. In this note, we study charged particle emissions in high-frequency alternative electric fields, treating α decay, proton emission, cluster radioactivity in a unified approach inspired by Ref. [41][42][43][44][45][46][47].By high-frequency alternative electric fields, we refer to alternative electric fields with frequencies (photon energies ω) much higher than the Q values of charged particle emissions, which means ω Q α ∼ 10 MeV, Q p ∼ 1 MeV, Q c ∼ 50 MeV for α decay, proton emission, and cluster radioactivity, respectively. High-frequency alternative electric fields correspond 1/3 d and R c0 = 1.2A 1/3 c are their radii. β 2d and β 2c are the corresponding deformation parameters. The spherical Coulomb potential could be restored by setting β λ = 0.

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Cluster Radioactivity

Cited by 54 publications

References 97 publications

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

Multi-modal fission in collinear ternary cluster decay of 252 Cf(sf, fff)

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

Charged particle emissions in high-frequency alternative electric fields

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