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Decay properties of neutron-deficient isotopes 256, 257Db, 255Rf, 252, 253Lr (2001)

Heßberger, F.P. ; Hofmann, S. ; Ackermann, D. ; [et al.]

Springer

The European physical journal 12 (2001), S. 57-67

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ISSN: 1434-601X

Keywords: PACS. 23.60.+e Alpha decay – 25.70.Jj Fusion and fusion-fission reactions – 25.85.Ca Spontaneous fission – 23.20.Lv Gamma transitions and level energies

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. Isotopes of dubnium (element 105) with mass numbers A = 256, 257, and 258 were produced by the reaction 209Bi(50Ti,xn) 259-xDb (x = 1, 2, 3) at projectile energies of (4.59-5.08) AMeV. Excitation functions were measured for the 1n, 2n and 3n evaporation channels. The same position of the excitation function was observed for the 1n channel as for the previously measured 1n channel of the reaction 208Pb(50Ti,1n)257Rf. The measured α-decay data of 257Db and its daughter products resulted in the identification of α-decaying isomeric states in 257Db and 253Lr. Two new isotopes, 256Db and 252Lr, were produced at the highest bombarding energies of 4.97 AMeV and 5.08 AMeV. They were identified by delayed α-α coincidences. The measured half-lives are (1.6+0.5 -0.3) s for 256Db and (0.36+0.11 -0.07) s for 252Lr. Besides α-decay, a spontaneous fission activity of T 1/2 = (2.3+1.1 -0.6) s was observed and attributed to an electron-capture branch of 256Db, which feeds the fissioning nucleus 256Rf. A branching ratio of 0.36±0.12 was obtained. The isotope 255Rf was produced by the reaction 207Pb(50Ti,2n)255Rf. Improved decay data have been obtained by means of α- and α-γ spectroscopy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500170039

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Search for new isotopes of element 112 by irradiation of 238U with 48Ca (1999)

Oganessian, Yu.Ts. ; Yeremin, A.V. ; Gulbekian, G.G. ; [et al.]

Springer

The European physical journal 5 (1999), S. 63-68

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ISSN: 1434-601X

Keywords: PACS:21.10.Dr Binding energies, masses and excitation energy – 23.60.+e α-decay – 25.70.-z Heavy ion induced reactions and scattering – 25.85.Ca Spontaneous fission – 27.90.+b 220 ≤ A

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The reaction 48Ca+238U was investigated at the recoil separator VASSILISSA at the Flerov Laboratory of Nuclear Reactions, JINR Dubna, in attempts to synthesize new isotopes of element 112. The experiments were performed at two beam energies resulting in excitation energies of the compound nucleus of 33 and 39 MeV. The collected beam dose was 3.5 × 1018 and 2.2 × 1018, respectively. Two spontaneous fission events were observed at the lower beam energy, which tentatively were assigned to the new neutron rich isotope 283112 produced in the reaction 238U(48Ca,3n)283112. The measured cross-section is (5.0+6.3 −3.2) pb and the half–life is (81+147 −32) s. No event was observed at the higher beam energy resulting in the upper cross–section limit of 7.3 pb.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500050257

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Alpha decay of the new isotopes 188,189Po (1999)

Andreyev, A.N. ; Ackermann, D. ; Cagarda, P. ; [et al.]

Springer

The European physical journal 6 (1999), S. 381-385

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ISSN: 1434-601X

Keywords: PACS:23.60.+e α decay – 27.70.+q 150 ≤ A ≤ 189 – 27.80.+w 190 ≤ A ≤ 219

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract. New neutron-deficient isotopes 188,189Po have been produced in the complete fusion reaction of 52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of α-γ and α-conversion electron coincidence measurements and of α-α position and time correlations. In 189Po a ground state to ground state α decay with Eα1= 7540(20) keV, T1/2= 5(1) ms and two fine structure α-decays at Eα2= 7264(15) keV and Eα3= 7316(15) keV have been observed. In 188Po (T1/2= 400+200 −150μs) a ground state to ground state α decay at Eα= 7915(25) keV and a fine structure α decay at Eα= 7350(40) keV have been found. Improved data on the α-decay of 189Bi were obtained.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500050359

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