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Production and decay of269110 (1995)

Hofmann, S. ; Ninov, V. ; Heßberger, F. P. ; [et al.]

Springer

The European physical journal 350 (1995), S. 277-280

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ISSN: 1434-601X

Keywords: 21.10.Dr ; 23.60.+e ; 25.70.−z ; 27.90.+b

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract In an experiment carried out to identify element 110, we have observed anα-decay chain, that can be unambiguously assigned to269110. In a scries of preexperiments the excitation functions of the fusion reactions50Ti +208Pb→258104* and58Fe +208Pb→266108* were measured with high precision in order to get the optimum projectile energies for the production of these heavy elements. The cross-section maxima of the 1n evaporation channels were observed at excitation energies of 15.6 MeV and 13.4 MeV, respectively. These data result in an optimum excitation energy of 12.3 MeV of the compound nucleus for the production of269110 in the reaction62Ni +208Pb→269110 + 1n. In irradiations at the corresponding beam energy of 311 MeV we have observed a decay chain of 4 subsequent a decays. This can be assigned to the isotope with the mass number 269 of the element 110 on the basis of delayed α-α coincidences. The accurately measured decay data of the daughter isotopes of the elements 108 to 102, obtained in the previous experiments, were used. The isotope269110 decays with a hair-life of (270 -120 +1300 ) μs by emission of (11.132±0.020) MeV alpha particles. The production cross-section is (3.3 -2.7 +6.2 ) pb.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291181

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Identification of the neutron-deficient isotopes213,214Pa (1995)

Ninov, V. ; Heßberger, F. P. ; Hofmann, S. ; [et al.]

Springer

The European physical journal 351 (1995), S. 125-126

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ISSN: 1434-601X

Keywords: 23.60.+e ; 27.90.+b

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Two new neutron-deficient isotopes,213Pa and214Pa were produced in complete fusion reactions of51V-ions with170Er targets at (5.2−5.6) AMeV. The assignment was based on delayed evaporation residue -α -α time and position coincidences. Theα- decay energies of213,214Pa were measured to be Eα=(8236±20) keV and Eα=(8116±20) keV, respectively. The half-lives of213,214Pa were determined to be T1/2=(5.3 −1.6 +4.0 ms and T1/2=(17 ±3) ms, respectively.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01289518

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The new element 111 (1995)

Hofmann, S. ; Ninov, V. ; Heßberger, F. P. ; [et al.]

Springer

The European physical journal 350 (1995), S. 281-282

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ISSN: 1434-601X

Keywords: 21.10.Dr ; 23.60.+e ; 25.70.−z ; 27.90.+b

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The new element 111 was produced and unambiguously identified in an experiment at SHIP, GSI Darmstadt. Three nuclei of the isotope272111 were observed in irradiations of209Bi targets with64Ni projectiles of 318 MeV and 320 MeV energy. The cross-sections are (1.7 −1.4 +3.3 ) pb and (3.5 −2.3 +4.6 ) pb, respectively. The nuclei decay by a emission into the new and so far the heaviest isotopes of the elements 109 and 107 with mass numbers A=268 and A=264. Theα-decay chains were followed down to the known nuclei260105 and256Lr.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291182

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Fine Structure in the alpha decays of 226U and 230Pu (1999)

Greenlees, P.T. ; Kuusiniemi, P. ; Amzal, N. ; [et al.]

Springer

The European physical journal 6 (1999), S. 269-273

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ISSN: 1434-601X

Keywords: PACS: 23.60 +e α decay – 27.90 +b 220 〈 A – 25.70 -z Low and intermediate energy heavy-ion reactions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The nuclei 226U and 230Pu have been populated via reactions involving 208Pb targets bombarded by 22Ne and 26Mg projectiles. Fusion-evaporation residues were separated in-flight using a gas-filled recoil separator. A position-sensitive Si-strip detector was employed at the focal plane in order to identify correlated α-decay chains. Two fine structure α-decay lines have been observed. The first, with an energy of 7385(5) keV, is assigned as the α decay from 226U to the first excited 2+ state of 222Th. The second line, observed for the first time in this work, has an energy of 6961(30) keV and is assigned as the α decay from 230Pu to the first excited 2+ state of 226U. The excitation energy of the first excited 2+ state in 226U was determined to be 96(25) keV, giving an estimate of the deformation parameter β2≃ 0.20.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500050345

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