Measurement of proton-evaporation rates in fusion reactions leading to transfermium nuclei

Лопез-Мартенс, А.; Yeremin, A. V.; Tezekbayeva, M. S.; Asfari, Zouhair; Brionnet, P.; Dorvaux, O.; Галл, Б.; Hauschild, K.; Ackermann, D.; Cáceres, L.; Chelnokov, M. L.; Chepigin, V. I.; Gustova, M. V.; Исаев, А. В.; Карпов, А. В.; Kuznetsova, A. A.; Piot, J.; Malyshev, O. N.; Popeko, A. G.; Popov, Yu. A.; Rezynkina, K.; Savajols, H.; Svirikhin, A. I.; Sokol, E. A.; Steinegger, P.

doi:10.1016/j.physletb.2019.06.010

Cited by 13 publications

(8 citation statements)

References 34 publications

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“…They result in σ ¼ 59 þ29 −21 pb, which is comparable with the 65 þ34 −25 pb deduced from the α events assigned to 244 Md. However, in this region of heavy nuclei, pxn channels are evidently populated alongside the xn ones, but with cross sections often a factor of 10 or more smaller than those of the xn ones [30,[32][33][34]. Such a σ value for the p2n channel comparable to the xn ones is presently unknown for syntheses of heavy nuclei with Z ≳ 96 [30,33,34] while it is known to occur with high probabilities in the region of neutron-deficient nuclei with Z < 96 [21,35,36].…”

supporting

confidence: 64%

“…However, in this region of heavy nuclei, pxn channels are evidently populated alongside the xn ones, but with cross sections often a factor of 10 or more smaller than those of the xn ones [30,[32][33][34]. Such a σ value for the p2n channel comparable to the xn ones is presently unknown for syntheses of heavy nuclei with Z ≳ 96 [30,33,34] while it is known to occur with high probabilities in the region of neutron-deficient nuclei with Z < 96 [21,35,36]. Nevertheless, if such an unexpectedly high p2n cross section occurs in the present study, this would indeed be an intriguing observation, which would substantially strengthen the motivation for syntheses of SHN in pxn channels, as suggested in Ref.…”

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confidence: 99%

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Search for Electron-Capture Delayed Fission in the New Isotope Md244

et al. 2020

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The electron-capture decay followed by a prompt fission process was searched for in the hitherto unknown most neutron-deficient Md isotope with mass number 244. Alpha decay with α-particle energies of 8.73-8.86 MeV and with a half-life of 0.30 þ0.19 −0.09 s was assigned to 244 Md. No fission event with a similar half-life potentially originating from spontaneous fissioning of the short-lived electron-capture decay daughter 244 Fm was observed, which results in an upper limit of 0.14 for the electron-capture branching of 244 Md. Two groups of fission events with half-lives of 0.9 þ0.6 −0.3 ms and 5 þ3 −2 ms were observed. The 0.9 þ0.6 −0.3 ms activity was assigned to originate from the decay of 245 Md. The origin of eight fission events resulting in a half-life of 5 þ3 −2 ms could not be unambiguously identified within the present data while the possible explanation has to invoke previously unseen physics cases.

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confidence: 64%

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confidence: 99%

Search for Electron-Capture Delayed Fission in the New Isotope Md244

et al. 2020

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“…− Q and angular momentum J. Q is the mass difference between the sum of reactant nuclei and the CN. In the case of the heaviest nuclei, mostly neutrons are evaporated [5,[54][55][56], leading to a preferential and almost exclusive population of neutron evaporation channels (xn channels). Thus, discussing ERs of the fusion reaction leading to SHE, we refer to all possible neutron-evaporation channels (xn channels).…”

Section: Discussionmentioning

confidence: 99%

Search for elements 119 and 120

Khuyagbaatar¹,

Yakushev²,

Düllmann³

et al. 2020

Phys. Rev. C

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“…The transfermium elements (Z>100) up to Z=106 were created by irradiations of reactor bred actinide targets with light projectiles, typically O or N [11]. Elements up to Z=113 are synthesized by cold fusion with Pb or Bi targets and appropriate beams such as Ni and Zn [1,12,13] whereas the elements beyond are produced by hot fusion with 48 Ca beams together with suitable actinide targets [3-6, 10, 14-17].…”

Section: Introductionmentioning

confidence: 99%

Study of Decay Modes in Transfermium Isotopes

Singh,

Sharma,

Kaushik

et al. 2020

Preprint

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In the unknown territory of transfermium nuclei, the relativistic mean-field (RMF) theory has been applied to probe decay modes which include α-decay, spontaneous fission (SF), and a less explored weak-decay. These decay modes are analyzed on equal footing for 101≤Z≤109 and as a consequence, the half-lives for weak-decay are indeed found comparable for several isotopes. Our prediction of decay modes and half-lives are found in excellent agreement with available experimental decay modes and half-lives along with the results of some other theories. Out of α, β + /EC, β − , and SF, the most probable decay mode is anticipated along with its half-life over a wide range of odd and even nuclei to frame a novel sight into terra incognita.

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Measurement of proton-evaporation rates in fusion reactions leading to transfermium nuclei

Cited by 13 publications

References 34 publications

Search for Electron-Capture Delayed Fission in the New Isotope Md244

Search for Electron-Capture Delayed Fission in the New Isotope Md244

Search for elements 119 and 120

Study of Decay Modes in Transfermium Isotopes

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