Decay spectroscopy of element 115 daughters:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Rg</mml:mi><mml:mprescripts /><mml:none /><mml:mn>280</mml:mn></mml:mmultiscripts><mml:mo>→</mml:mo><mml:mmultiscripts><mml:mi>Mt</mml:mi><mml:mprescripts /><mml:none /><mml:mn>276</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Mt</mml:mi><mml:mprescripts /><mml:none /><mm

Gates, J. M.; Gregorich, Κ. Ε.; Gothe, Oliver; Uribe, Eva; Pang, G. K.; Bleuel, D. L.; Block, M.; Clark, R. M.; Campbell, C. M.; Crawford, H. L.; Cromaz, M.; Nitto, A. Di; Düllmann, Ch. E.; Esker, N. E.; Fahlander, C.; Fallon, P.; Farjadi, R. M.; Forsberg, U.; Khuyagbaatar, J.; Loveland, W.; Macchiavelli, A. O.; May, Erin M.; Mudder, P. R.; Olive, Daniel T.; Rice, Anna; Rissanen, J.; Rudolph, Dirk; Sarmiento, Luis; Shusterman, Jennifer A.; Stoyer, M. A.; Wiens, A.; Yakushev, A.; Nitsche, H.

doi:10.1103/physrevc.92.021301

Cited by 50 publications

(22 citation statements)

References 25 publications

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“…However, the calculation of their -decay energies from the highest measured -particle energies [1][2][3] appears to be justified. For example, the Q values for odd-odd nuclei 288 115-272 Bh, estimated or measured from the observed -coincidences [16,17] are in good agreement with such calculations. For all of the nuclides, these values are lower than those from [16,17] by 0.03-0.24 MeV [3], which might indicate that transitions occur to the low-lying exited states of the descendants.…”

Section: Resultssupporting

confidence: 72%

“…The same decay chains were later produced in experiments with 243 Am which were performed at TASCA [16] and BGS [17]. In [18], the summary of decay times of nuclei in the short decay chains were re-analyzed which led to the interpretation that some of these chains might start from the isotope 288 115 and proceed through either SF or electron capture decay branches of 284 113 and 280 Rg.…”

Section: Resultsmentioning

confidence: 89%

“…Therefore, conformity with all of the above-mentioned criteria demonstrates that the observed SHN originate from the complete-fusion reactions followed by the evaporation of the neutrons. Furthermore, the decay properties of 294 117, 291−293 Lv, 287−289 115, 285−289 Fl, and 283 Cn and their descendants were determined in different laboratories with use of different techniques (separators DGFRS, SHIP, TASCA, BGS, GARIS, and chemistry setups) that is in accordance with demand of reproducibility for recognition of the discovery of new elements (see [1,3,5,10,11,[15][16][17][18], references therein, and proceedings of this Symposium).…”

Section: Resultsmentioning

confidence: 99%

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Discovery of Elements 113–118

Utyonkov¹,

Oganessian²,

Dmitriev³

et al. 2017

Fission and Properties of Neutron-Rich Nuclei

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Discovery and investigation of the "Island of stability" of superheavy nuclei at the separator DGFRS in the 238 U-249 Cf+ 48 Ca reactions is reviewed. The results are compared with the data obtained in chemistry experiments and at the separators SHIP, BGS, TASCA, and GARIS. The synthesis of the heaviest nuclei, their decay properties, and methods of identification are discussed and compared with the criteria that must be satisfied for claiming the discovery of a new chemical element. The role of shell effects in the stability of superheavy nuclei is demonstrated by comparison of the experimental results with empirical systematics and theoretical data. a Corresponding author: utyonkov@jinr.ru C The Authors, published by EDP Sciences. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

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Discovery of Elements 113–118

Utyonkov¹,

Oganessian²,

Dmitriev³

et al. 2017

Fission and Properties of Neutron-Rich Nuclei

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“…In this context, theory will benefit greatly from both progress in developing new spectroscopic-quality global EDFs and more sophisticated statistical techniques of uncertainty quantification. Experimentally, work on identifying new superheavy nuclei from the upper superheavy (hot fusion) region, without the use of Q α values, is already underway [79][80][81].…”

Section: Discussionmentioning

confidence: 99%

α -decay energies of superheavy nuclei: Systematic trends

Olsen

Nazarewicz

2019

Phys. Rev. C

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Background: New superheavy nuclei are often identified through their characteristic α-decay energies, which requires accurate calculations of Qα values. While many Qα predictions are available, little is known about their uncertainties, and this makes it difficult to carry out extrapolations to yet-unknown systems.Purpose: This work aims to analyze several models, compare their predictions to available experimental data, and study their performance for the unobserved α-decay chains of 296 120 and 298 120, which are of current experimental interest. Our quantified results will also serve as a benchmark for future, more sophisticated statistical studies. Methods:We use nuclear superfluid Density Functional Theory (DFT) with several Skyrme energy density functionals (EDFs). To estimate systematic model uncertainties we employ uniform model averaging.Results: We evaluated the Qα values for even-even nuclei from Fm to Z = 120. For well deformed nuclei between Fm and Ds, we find excellent consistency between different model predictions, and a good agreement with experiment. For transitional nuclei beyond Ds, inter-model differences grow, resulting in an appreciable systematic error. In particular, our models underestimate Qα for the heaviest nucleus 294 Og. Conclusions:The robustness of DFT predictions for well deformed superheavy nuclei supports the idea of using experimental Qα values, together with theoretical predictions, as reasonable (Z, A) indicators. Unfortunately, this identification method is not expected to work well in the region of deformed-to-spherical shape transition as one approaches N = 184. The use of Qα values in the identification of new superheavy nuclei will benefit greatly from both progress in developing new spectroscopic-quality EDFs and more sophisticated statistical techniques of uncertainty quantification.

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“…Fig. 3) [16][17][18]. It is expected that these discrepancies will be cleared up as more SHE data become available.…”

Section: Cross Bombardmentsmentioning

confidence: 99%

How good are superheavy elementZandAassignments?

Gregorich

2016

EPJ Web Conf.

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Proton number, Z, and mass number,A, assignments for newly discovered heavy element nuclides have historically been made by observing decay to a daughter with well-established Z and A, and then observing the well-know decay of that daughter. For all of the new superheavy element isotopes observed in 48 Ca irradiations of actinide targets, this correlation technique has not been possible, because the -decay chains end in spontaneous fission of previously unknown isotopes. Consequently, Z and A assignments have been made by less-direct means. The superheavy element Z and A assignment methods are summarized, and possibilities for how they may be incorrect are explored. While it is highly likely that most of the superheavy element Z and A assignments are correct, there is a real need for a direct proof. How SHE Z and A assignments have been madeFor the SHE isotopes produced in 48 Ca irradiation of actinide targets, and all of the daughter isotopes resulting from successive -decays, experimenters have resorted to lessdirect means of Z and A assignment. These less-direct means are excitation functions, cross bombardments, and decay systematics. a

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Decay spectroscopy of element 115 daughters:Rg280→Mt276andMt

Cited by 50 publications

References 25 publications

Discovery of Elements 113–118

Discovery of Elements 113–118

α -decay energies of superheavy nuclei: Systematic trends

How good are superheavy elementZandAassignments?

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