Production of Even-Even Superheavy Nuclei in Cold Fusion Reactions

Smolańczuk, R.

doi:10.1103/physrevlett.83.4705

Cited by 17 publications

(5 citation statements)

References 23 publications

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“…The Q-values are similar for the PCM and GLDM models and are very small (minimum) for the α-decay of 285 114 parent. However, this is contrary to the predictions of Smolańczuk [35], which guided the Berkeley retracted experiment. Smolańczuk [35] predicted the Q-values as an ever increasing function of the parent nucleus charge (or mass), and became an apparent cause for the failure of this experiment [1].…”

contrasting

confidence: 70%

“…The stability at Z=114 in the calculations arises due to the Q-values involved, as is evident from Fig. 3(a) where the calculated Q-values are plotted as a function of the parent nuclear masses A Z for both the PCM and GLDM models, as well as that of another calculation by Smolańczuk [35]. The Q-values are similar for the PCM and GLDM models and are very small (minimum) for the α-decay of 285 114 parent.…”

mentioning

confidence: 91%

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Structure effects in the region of superheavy elements via the -decay chain of²⁹³118

Gupta

Kumar²,

Kumar³

et al. 2002

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

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The α-decay chain of 293 118, first proposed in the Berkeley cold fusion experiment 208 Pb( 86 Kr,1n) and now retracted, is calculated by using the preformed cluster model (PCM) of one of us (RKG). Also, the possible branchings of α-particles to heavier cluster decays of all the parents in this chain are calculated for the first time. The calculated Q-values, penetrabilities and preformation factors for α-decays suggest that the 285 114 nucleus with Z=114, N=171 is a magic nucleus, either due to the magicity of Z=114, or of N=172 or of both. The N=172 is proposed to be a magic number in certain relativistic mean-field calculations, but with Z=120. The calculated cluster decays point to new interesting possibilities of 14 C decay of the 281 112 parent, giving rise to a (reasonably) deformed Z=106, N=161, 267 106 daughter (N=162 being now established as the deformed magic shell) or to a doubly magic 48 Ca cluster emitted from any of the parent nucleus in the α-decay chain. Apparently, these are exciting new directions for future experiments.

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confidence: 70%

mentioning

confidence: 91%

Structure effects in the region of superheavy elements via the -decay chain of²⁹³118

Gupta

Kumar²,

Kumar³

et al. 2002

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

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“…Considering this region our article overlaps the formerly published studies of that type done by the Warsaw group [22][23][24], where a similar range of SHE was studied in the YpE+WS model. Here, the commonly used macroscopic models such as Myers-Swiatecki drop (MSD), the droplet model (DPT) [25], or Yukawa-plus-exponential [26] are examined in comparison to the recent (LSD) model, which was shown to be more powerful in determining masses and fission barriers all over the periodic table [27,28].…”

Section: Introductionmentioning

confidence: 84%

Global properties of even-even superheavy nuclei in macroscopic-microscopic models

Baran

Łojewski²,

Sieja

et al. 2005

Phys. Rev. C

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A systematic study of global properties of superheavy nuclei in the framework of macroscopic-microscopic method is performed. Equilibrium deformations, masses, quadrupole moments, radii, shell energies, fission barriers and half-lives are calculated using the following macroscopic models: Myers-Swiatecki liquid drop, droplet, Yukawa-plus-exponential, and Lublin-Strasbourg drop. Shell and pairing energies are calculated in Woods-Saxon potential with a universal set of parameters. The analysis covers a wide range of even-even superheavy nuclei from Z=100 to 122. Magic and semimagic numbers occurring in this region are indicated and their influence on the observables is discussed. The strongest shell effects appear at proton number Z=114 and at neutron number N=184. Deformed shell closures are found at N=152 and 162. Spontaneous fission half-lives are calculated in a dynamical approach where the full minimization of the action integral in a three-dimensional deformation space of $\beta$ deformations is performed. The fission half-lives obtained this way are two orders of magnitude smaller than the ones resulting from static calculations. The agreement of theoretical results and experimental data is satisfying

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“…Arrows in bold represent measured α and γ rays and SF. The data of the proposed partial level schemes are taken from theoretical studies of [96] for the rotational levels, of [103] for the K isomers and of [58,104] for the α energies and SF half-life of 262 Sg, respectively. For a detailed discussion see [105].…”

Section: Stability Of Shnmentioning

confidence: 99%

Super-heavy nuclei

Hofmann¹

2015

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

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Scientifically based searches for elements beyond uranium started after the discovery of the neutron. Neutrons captured by uranium nuclei and subsequent bdecay, similarly as most of the elements were produced in nature, was the successful method applied. However, as a first result, Hahn and Strassmann discovered nuclear fission indicating a limit for the existence of nuclei at an increasing number of protons. Eventually, the nuclear shell model allowed for a more accurate calculation of binding energies, half-lives and decay modes of the heaviest nuclei. Theoreticians predicted a region of increased stability at proton number Z = 126, later shifted to 114, and neutron number N = 184. These nuclei receive their stability from closed shells for the protons and neutrons. Later, increased stability was also predicted for deformed nuclei at Z = 108 and N = 162. In this review I will report on experimental work performed on research to produce and identify these super-heavy nuclei (SHN). Intensive heavy ion beams, sophisticated target technology, efficient electromagnetic ion separators, and sensitive detector arrays were the prerequisites for discovery of 12 new elements during the last 40 years. The results are described and compared with theoretical predictions and interpretations. An outlook is given on further improvement of experimental facilities which will be needed for exploration of the extension and structure of the island of SHN, in particular for searching for isotopes with longer halflives predicted to be located in the south east of the island, for new elements, and last not least, for surprises which, naturally, emerge unexpectedly.

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Production of Even-Even Superheavy Nuclei in Cold Fusion Reactions

Cited by 17 publications

References 23 publications

Structure effects in the region of superheavy elements via the -decay chain of²⁹³118

Structure effects in the region of superheavy elements via the -decay chain of²⁹³118

Global properties of even-even superheavy nuclei in macroscopic-microscopic models

Super-heavy nuclei

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Production of Even-Even Superheavy Nuclei in Cold Fusion Reactions

Cited by 17 publications

References 23 publications

Structure effects in the region of superheavy elements via the -decay chain of293118

Structure effects in the region of superheavy elements via the -decay chain of293118

Global properties of even-even superheavy nuclei in macroscopic-microscopic models

Super-heavy nuclei

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Product

Resources

About

Structure effects in the region of superheavy elements via the -decay chain of²⁹³118

Structure effects in the region of superheavy elements via the -decay chain of²⁹³118