Heavy fragment radioactivity of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pu</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>238</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>: Si and Mg emission

Wang, Shicheng; Snowden-Ifft, D.P.; Price, P. B.; Moody, K. J.; Hulet, E.K.

doi:10.1103/physrevc.39.1647

Cited by 46 publications

(9 citation statements)

References 11 publications

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“…The deepest minimum corresponds to the splitting of 40 S + 208 Pb. The cluster is predicted by the available experimental techniques, branching ratio up to 10 −19 are possible for measurement [34]. Our decay calculation shows that symmetric fission is also probable in 251 Cf (e.g.…”

Section: Results Discussion and Conclusionmentioning

confidence: 58%

“…Since then the 14 C decay of many isotopes of Ra nuclei, and many other heavy cluster decays have been observed. Also 24 Ne from 230 Th, 231 Pa, 232 U, 20 O from 228 Th, 28,30 Mg from 238 Pu, 32,34 Si from 238 Pu and 241 Am have been observed [3]. From these decays the half-lives and branching ratios with respect to alpha decay are measured.…”

Section: Introductionmentioning

confidence: 94%

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Cold valleys in the radioactive decay of 248–254Cf isotopes

et al. 2008

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Based on the concept of cold valley in cold fission and fusion, we have investigated the cluster decay process in 248−254 Cf isotopes. In addition to alpha particle minima, other deep minima occur for S, Ar and Ca clusters. It is found that inclusion of proximity potential does not change the position of minima but minima become deeper. Taking Coulomb and proximity potential as interacting barrier for post-scission region, we computed half-lives and other characteristics for various clusters from these parents. Our study reveals that these parents are stable against light clusters and unstable against heavy clusters. Computed half-lives for alpha decay agree with experimental values within two orders of magnitude. The most probable clusters from these parents are predicted to be 46 Ar, 48,50 Ca which indicate the role of doubly or near doubly magic clusters in cluster radioactivity. Odd A clusters are found to be favorable for emission from odd A parents. Cluster decay model is extended to symmetric region and it is found that symmetric fission is also probable which stresses the role of doubly or near doubly magic 132 Sn nuclei. Geiger-Nuttal plots were studied for various clusters and are found to be linear with varying slopes and intercepts.

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Section: Results Discussion and Conclusionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 94%

Cold valleys in the radioactive decay of 248–254Cf isotopes

et al. 2008

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“…Therefore we will not describe in detail the PES of all actinides. In this section we will concentrate only on the CR of two representative nuclei, namely, the light cluster emitter 224 Ra, in which emission of 14 C is observed [2,15], and one of the heaviest emitters 238 Pu, that decays by producing the relatively large clusters 28,30 Mg and 32 Si [7]. A detailed account of our previous calculations in some other isotopes can be found in [31][32][33][34].…”

Section: Cluster Radioactivity Inmentioning

confidence: 99%

“…This discovery represented a milestone in the description of nuclear radioactivity as it bridged the gap between the α emission radioactivity and the standard fission reaction. Since then, cluster radioactivity (CR) has been found in twelve eveneven isotopes [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and seven odd-even isotopes (see, e.g., references in Refs. [22,23]) in the actinide region.…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of cluster radioactivity in actinide nuclei

2011

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Cluster radioactivity is the emission of a fragment heavier than an α particle and lighter than mass 50. The range of clusters observed in experiments goes from 14 C to 32 Si while the heavy mass residue is always a nucleus in the neighborhood of the doubly-magic 208 Pb nucleus. Cluster radioactivity is described in this paper as very asymmetric nuclear fission. A new fission valley leading to a decay with large fragment mass asymmetry matching the cluster radioactivity products is found. The mass octupole moment is found to be more convenient than the standard quadrupole moment as the parameter driving the system to fission. The mean-field Hartree-Fock-Bogoliubov theory with the phenomenological Gogny interaction has been used to compute the cluster emission properties of a wide range of even-even actinide nuclei from 222 Ra to 242 Cm, where emission of the clusters has been experimentally observed. Computed half-lives for cluster emission are compared with experimental results. The noticeable agreement obtained between the predicted properties of cluster emission (namely, cluster masses and emission half-lives) and the measured data confirms the validity of the proposed methodology in the analysis of the phenomenon of cluster radioactivity. A continuous fission path through the scission point has been described using the neck parameter constraint.

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“…We would like to mention that using the presently available techniques in cluster radioactivity, it is possible to measure half-life values up to 10 30 s and branching ratio as low as 10 −19 [49]. For computing branching ratios, experimental alpha half-life values are taken from Royer [46].…”

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confidence: 99%

Stability of 244–260Fm isotopes against alpha and cluster radioactivity

2009

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Taking Coulomb and proximity potentials as the interacting barrier we have studied the cold valley in the radioactive decay of 244−260 Fm isotopes. It is found that in addition to alpha particle minima, other minima occur at S, Ar and Ca clusters. We have computed the half-lives and other characteristics of different clusters emitted from these parents treating parent, daughter and emitted cluster as spheres. Our study reveals that most of these parents are unstable against alpha and heavy cluster ( 46 Ar, 48,50 Ca) emissions and stable against light cluster emission, except 8 Be from 244−248 Fm isotopes. The most probable clusters from these parents are predicted to be 46 Ar, 48,50 Ca which indicate the role of doubly or near doubly magic clusters (Z = 20, N = 28) and also stress the role of doubly magic 208 Pb daughter. The computed half-lives for alpha decay are in good agreement with the experimental data. It is found that the presence of neutron excess in the parent nuclei slows down the cluster decay process. The effect of quadrupole (β 2) and hexadecapole (β4) deformations of parent and fragments on half-lives are also studied. It is found that inclusion of β2 and β4 reduces the height and shape of the barrier (increases barrier penetrability) and hence the half-life decreases.

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Heavy fragment radioactivity ofPu238: Si and Mg emission

Cited by 46 publications

References 11 publications

Cold valleys in the radioactive decay of 248–254Cf isotopes

Cold valleys in the radioactive decay of 248–254Cf isotopes

Microscopic description of cluster radioactivity in actinide nuclei

Stability of 244–260Fm isotopes against alpha and cluster radioactivity

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