Observation of the isotopes264108 and265108

Münzenberg, G.; Armbruster, P.; Berthes, G.; Folger, H.; Heßberger, F. P.; Hofmann, S.; Keller, J. G.; Poppensieker, K.; Quint, A. B.; Reisdorf, W.; Schmidt, Karl‐Heinz; Schött, H. J.; Sümmerer, K.; Zychor, I.; Leino, M.; Hingmann, R.; Gollerthan, U.; Hanelt, E.

doi:10.1007/bf01295182

Cited by 18 publications

(12 citation statements)

References 33 publications

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“…The discovery was accomplished using the Separator for Heavy Ion reaction Products (SHIP). Today, the isotopes 263-271 Hs have positively been identified [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Furthermore, one α-decay of 273 Hs with a life-time of 0.346 s [17], 3 α-decays of 275 Hs with a half-life of 0.19 s [18], and one SF decay of 277 Hs as decay product of 289 114 with a lifetime of 4.5 ms have been reported recently [19].…”

Section: Introductionmentioning

confidence: 94%

“…Neutron-deficient hassium were produced in so-called "cold" fusion reactions using the reactions 208 Pb( 56 Fe, 1n) 263 Hs [2,3], 207 Pb( 58 Fe, 1n) 264 Hs, and 208 Pb( 58 Fe, 1n) 265 Hs [5]. The more neutron-rich 266 Hs, 267 Hs, and 269 Hs were observed for the first time as daughters of 270 Ds, 271 Ds, and 277 Cn produced in the cold fusion reactions 207 Pb( 64 Ni, 1n) [6], 208 Pb( 64 Ni, 1n) [7][8][9], and 208 Pb( 70 Zn, 1n) [11][12][13], respectively.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Türler¹

2011

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Superheavy elements / Hassium / Nuclear structure / Reaction studiesSummary. Fast on-line gas chemical separations of Hs (hassium, element 108) in the form of HsO 4 were applied to investigate the reactions 26 Mg + 248 Cm and 36 S + 238 U. In an experiment at the gas-filled separator DGFRS the reaction 48 Ca + 226 Ra was studied. In all cases the product of complete nuclear fusion is 274 Hs * . For the first time, the new nuclide 270 Hs was produced in the 4n evaporation channel and its decay properties investigated. The nuclide 270 Hs was predicted by microscopic-macroscopic calculations to be a deformed doubly magic nucleus and its decay properties are therefore of special interest to theory. Also, much more detailed information was gained on the decay of 269 Hs and its daughters, which led to a new assignment of decay properties of the daughter nuclides 265 Sg and 261 Rf . There is evidence for isomeric states in 265 Sg and 261 Rf , while 266 Sg is not an alpha-particle emitter as believed previously, but decays by spontaneous fission (SF) with a rather short half-life. Also, interesting features of the used reaction 26 Mg + 248 Cm led to the discovery of the nucleus 271 Hs in the same experiments. An investigation of the influence of the Q-value on the fusion reaction in relation to the location of the fusion barrier showed, that the high binding energy of 48 Ca largely compensates for the lower fusion probability compared to more asymmetric reactions, while 36 S is not as promising as a projectile.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Türler¹

2011

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“…Elements 108 (Hs) [5][6][7], 109 (Mt) [8][9][10], 110 (Ds) [11], 111 (Rg) [12], 112 [13][14][15], 113 [16], 114 [17][18][19][20], 115 [3], 116 [21][22][23], 117 [24] and 118 [25,23] have been observed in a series of experiments in Berkeley, GSI, Dubna and RIKEN. Chemistry of transactinide elements 104 (Rf) to 108 has been performed one atom at a time (see, e.g., [26] for a review).…”

Section: Introductionmentioning

confidence: 99%

Are MCDF calculations 101% correct in the super-heavy elements range?

2011

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We explore QED and many-body effects in superheavy elements up to Z = 173 using the multiconfiguration Dirac-Fock method. We study the effect of going beyond the average-level approximation on the determination of the ground state of element 140, and compare with the recent work of Pekka Pyykkö on the periodic table for super heavy elements [1]. We confirm that QED corrections are of the order of 1% on ionization energies. We show that the atomic number at which the 1s shell dives into the negative energy continuum is 173, and is not affected by the approximation employed to evaluate the electron-electron interaction.

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“…Two semi-empirical formulas [20,21] have been used to calculate a-decay half-lives. Generally, results from both formulas are in reasonably good agreement with known a-decay half-lives [6]. The ÖEc-values are from Ref.…”

Section: Discussionmentioning

confidence: 52%

“…Overcoming the limitations of cold fusion reactions has become even more desirable in recent years. After the unexpected experimental Observation of a-decay for the isotopes and [5,6], indicating a strong shell stabilization, various theoretical calculations have indicated a new region of deformed nuclei around neutron number N = 162 that are expected to be especially stable against spontaneous fission [7,8,9], with fission barriers as high as 5.5 to 7 MeV. Spontaneous fission half-lives are estimated to be hours and longer, and electron capture (EC)-and alpha-decay are predicted to be the dominant decay Channels [8,10], Fusion reactions with ^Es as a target will lead to the most neutron-rich Compound nuclei for elements above Z = 104, providing a means of investigating this region of enhanced nuclear stability.…”

Section: Introductionmentioning

confidence: 99%

Radiochemical Search for Neutron-rich Isotopes of Nielsbohrium in the ¹⁶O + ²⁵⁴Es Reaction

et al. 1995

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We have used on-line gas chromatography to search for new isotopes of Clement 107 near the deformed sub-shell lAN = 162 and Z = 108. Enhanced nuclear stability is predicted for this region. ^'^'Es was iiradiated with "O at barrier energies to minimize the fusion hindrance in the entrance Channel and to reduce the excitation energy of the Compound nucleus to a minimum value. For half-lives between roughly 2 s and 2 min no signal for a positive Identification of a new isotope of dement 107 was detected. Consequently, only an upper cross-section limit of a few nanobams was obtained. While this cross-section limit was too high to probe the influence of the predicted enhanced nuclear ground-state stability on the survival probability in the fission/ evaporation competition, a very large cross-section enhancement would have been detectable.

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Observation of the isotopes264108 and265108

Cited by 18 publications

References 33 publications

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Are MCDF calculations 101% correct in the super-heavy elements range?

Radiochemical Search for Neutron-rich Isotopes of Nielsbohrium in the ¹⁶O + ²⁵⁴Es Reaction

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Observation of the isotopes264108 and265108

Cited by 18 publications

References 33 publications

Nuclear structure and reaction studies near doubly magic 270Hs

Nuclear structure and reaction studies near doubly magic 270Hs

Are MCDF calculations 101% correct in the super-heavy elements range?

Radiochemical Search for Neutron-rich Isotopes of Nielsbohrium in the 16O + 254Es Reaction

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Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Radiochemical Search for Neutron-rich Isotopes of Nielsbohrium in the ¹⁶O + ²⁵⁴Es Reaction