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Journal Articles

Search for elements 119 and 120

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; et al.

Physical Review C, 102(6), p.064602_1 - 064602_9, 2020/12

https://doi.org/10.1103/PhysRevC.102.064602
 Times Cited Count：43 Percentile：98.01(Physics, Nuclear)

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the $$^{50}$$Ti+$$^{249}$$Bk and $$^{50}$$Ti+$$^{249}$$Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA. Over four months of irradiation, neither was detected at cross-section sensitivity levels of 65 and 200 fb, respectively. The non-observation of elements 119 and 120 is discussed within the concept of fusion-evaporation reactions including various theoretical predictions on the fission-barrier heights of superheavy nuclei in the region of the island of stability.

Journal Articles

Fusion reaction $$^{48}$$Ca+$$^{249}$$Bk leading to formation of the element Ts (Z=117)

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; et al.

Physical Review C, 99(5), p.054306_1 - 054306_16, 2019/05

AA2019-0039.pdf:5.03MB

https://doi.org/10.1103/PhysRevC.99.054306
 Times Cited Count：23 Percentile：90.91(Physics, Nuclear)

We have performed an experiment to synthesize the element 117 (Ts) with the $$^{48}$$Ca+$$^{249}$$Bk fusion reaction. Four $$alpha$$-decay chains attributed to the element 117 were observed. Two of them were long decay chains which can be assigned to the one originating from the $$alpha$$ decay of $$^{294}$$Ts. The other two were short decay chains which are consistent with the one originating from the $$alpha$$ decay of $$^{293}$$Ts. We have compared the present results with the literature data, and found that our present results mostly confirmed the literature data, leading to the firm confirmation of the synthesis of the element 117.

Journal Articles

$$^{48}$$Ca + $$^{249}$$Bk fusion reaction leading to element Z = 117; Long-lived $$alpha$$-decaying $$^{270}$$Db and discovery of $$^{266}$$Lr

Khuyagbaatar, J.*; Yakushev, A.*; D$"u$llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Asai, Masato; Block, M.*; Boll, R. A.*; Brand, H.*; Cox, D. M.*; et al.

Physical Review Letters, 112(17), p.172501_1 - 172501_5, 2014/05

https://doi.org/10.1103/PhysRevLett.112.172501
 Times Cited Count：208 Percentile：98.43(Physics, Multidisciplinary)

The superheavy element with atomic number 117 was produced in the $$^{48}$$Ca + $$^{249}$$Bk fusion reaction using the gas-filled recoil separator TASCA at GSI in Germany. This result verified the previous result of the discovery of new element 117 reported by Flerov Laboratory of Nuclear Reactions in Russia, which makes certain the synthesis and discovery of element 117 in human history. On the other hand, the last nucleus in the $$alpha$$ decay chain from the element 117 was assigned to be the unknown nucleus $$^{266}$$Lr instead of the previously reported $$^{270}$$Db, and $$^{270}$$Db was found to be the $$alpha$$-decaying nucleus with very long half-life.

Journal Articles

Superheavy element flerovium (element 114) is a volatile metal

Yakushev, A.*; Gates, J. M.*; T$"u$rler, A.*; Sch$"a$del, M.; D$"u$llmann, Ch. E.*; Ackermann, D.*; Andersson, L.-L.*; Block, M.*; Br$"u$chle, W.*; Dvorak, J.*; et al.

Inorganic Chemistry, 53(3), p.1624 - 1629, 2014/02

https://doi.org/10.1021/ic4026766
 Times Cited Count：103 Percentile：98.86(Chemistry, Inorganic & Nuclear)

We report on a gas-solid chromatography study of the adsorption of element 114 (flerovium, Fl) on a Au surface. Fl was produced in the nuclear fusion reaction $$^{244}$$Pu($$^{48}$$Ca, 3-4n)$$^{288,289}$$Fl and was isolated in-flight from the primary $$^{48}$$ beam in a physical recoil separator. The adsorption behavior of Fl, its nuclear $$alpha$$-decay product Cn, their lighter homologues in groups 14 and 12, i.e., Pb and Hg, and the noble gas Rn were studied simultaneously by isothermal gas chromatography and thermochromatography. Two Fl atoms were detected. They adsorbed on a Au surface at room temperature, but not as readily as Pb and Hg. The observed adsorption behavior of Fl points to a higher inertness compared to its nearest homologue in the group, Pb. However, the measured lower limit for the adsorption enthalpy of Fl on a Au surface points to the formation of a metal-metal bond of Fl with Au. Fl is the least reactive element in the group, but still a metal.

Journal Articles

The Recoil transfer chamber; An Interface to connect the physical preseparator TASCA with chemistry and counting setups

Even, J.*; Ballof, J.*; Br$"u$chle, W.*; Buda, R. A.*; D$"u$llmann, Ch. E.*; Eberhardt, K.*; Gorshkov, A.*; Gromm, E.*; Hild, D.*; J$"a$ger, E.*; et al.

Nuclear Instruments and Methods in Physics Research A, 638(1), p.157 - 164, 2011/03

https://doi.org/10.1016/j.nima.2011.02.053
 Times Cited Count：24 Percentile：85.64(Instruments & Instrumentation)

Journal Articles

Cross section limits for the $$^{248}$$Cm($$^{25}$$Mg, 4$$n$$-5$$n$$)$$^{268,269}$$Hs reactions

Dvorak, J.*; Br$"u$chle, W.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; Eichler, R.*; J$"a$ger, E.*; Nagame, Yuichiro; Qin, Z.*; Sch$"a$del, M.*; et al.

Physical Review C, 79(3), p.037602_1 - 037602_4, 2009/05

https://doi.org/10.1103/PhysRevC.79.037602
 Times Cited Count：17 Percentile：69.95(Physics, Nuclear)

no abstracts in English

Journal Articles

Observation of the 3$$n$$ evaporation channel in the complete hot-fusion reaction $$^{26}$$Mg + $$^{248}$$Cm leading to the new superheavy nuclide $$^{271}$$Hs

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; Nagame, Yuichiro; et al.

Physical Review Letters, 100(13), p.132503_1 - 132503_4, 2008/04

https://doi.org/10.1103/PhysRevLett.100.132503

The analysis of a large body of heavy ion fusion reaction data with medium-heavy projectiles (6$$leq$$Z$$leq$$18) and actinide targets suggests a disappearance of the 3$$n$$ exit channel with increasing atomic number of the projectile. Here, we report a measurement of the excitation function of the reaction $$^{248}$$Cm($$^{26}$$Mg,$$xn$$)$$^{274-x}$$Hs and the observation of the new nuclide $$^{271}$$Hs produced in the 3$$n$$ evaporation channel at a beam energy well below the Bass fusion barrier with a cross section comparable to the maxima of the 4$$n$$ and 5$$n$$ channels. This indicates the possible discovery of new neutron-rich transactinide nuclei using relatively light heavy ion beams of the most neutron-rich stable isotopes and actinide targets.

Journal Articles

Observation of the 3$$n$$ evaporation channel in the complete hot-fusion reaction $$^{26}$$Mg+$$^{248}$$Cm leading to the new superheavy nuclide $$^{271}$$Hs

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; D$"u$llmann, Ch. E.*; Dvorakova, Z.*; Eberhardt, K.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; Nagame, Yuichiro; et al.

Physical Review Letters, 100(13), p.132503_1 - 132503_4, 2008/04

https://doi.org/10.1103/PhysRevLett.100.132503
 Times Cited Count：125 Percentile：94.91(Physics, Multidisciplinary)

Journal Articles

Doubly magic nucleus $$^{270}_{108}$$Hs$$_{162}$$

Dvorak, J.*; Br$"u$chle, W.*; Chelnokov, M.*; Dressler, R.*; D$"u$llmann, Ch. E.*; Eberhardt, K.*; Gorshkov, V.*; J$"a$ger, E.*; Kr$"u$cken, R.*; Kuznetsov, A.*; et al.

Physical Review Letters, 97(24), p.242501_1 - 242501_4, 2006/12

https://doi.org/10.1103/PhysRevLett.97.242501
 Times Cited Count：152 Percentile：96.03(Physics, Multidisciplinary)

no abstracts in English

9 (Records 1-9 displayed on this page)
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