ZIB

1

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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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2

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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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3

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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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4

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Element 107 (1989)

Münzenberg, G. ; Armbruster, P. ; Hofmann, S. ; [et al.]

Springer

The European physical journal 333 (1989), S. 163-175

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ISSN: 1434-601X

Keywords: 23.60.+e ; 25.70.3f ; 25.85.Ca ; 27.9.+6

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We identified twoα-emitting isotopes of element 107 with masses of 261 and 262 respectively by parent-daughter correlations. For the isotope with mass 262 we found two transitions with (102±26) ms and (8.0±2.1) ms half-life, which we assign to the groundstate and to an isomeric transition, respectively. The half-life of the isotope with mass 261 is (11.8 −2.8 +5.3 ) ms. Spontaneous fission, which could be assigned to the decay of an isotope of element 107, was not detected in our experiments. This observation is in-line with our previous results, indicating a region of nuclei with strong microscopic stabilisation in the trans-actinides. Both new isotopes were produced by complete fusion of209Bi with54Cr. The production cross sections are (163±34) pb for262107 and (36 −14 +22 ) pb for261107.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01565147

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5

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The new nuclide225U (1989)

Heßberger, F. P. ; Gäggeler, H. ; Armbruster, P. ; [et al.]

Springer

The European physical journal 333 (1989), S. 111-112

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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 In the bombardment of a 270μg/cm 2 180Hf target with48 Ca projectiles at a primary beam energy of E/A=4.24 MeV/u the new nuclide225U was produced. The experiment was performed at the velocity filter SHIP. 225U was found to decay by α emission with Eα=(7880 ±20) keV (≈90%), (7830±20) keV (≈10%) and has a half-life ofT 1/2=(80 −20 +40 ms).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01290117

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Investigation of the fusion reaction27Al+236U→263105 at excitation energies of 57 MeV and 65 MeV (1992)

Andreyev, A. N. ; Bogdanov, D. D. ; Chepigin, V. I. ; [et al.]

Springer

The European physical journal 344 (1992), S. 225-226

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ISSN: 1434-601X

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

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The neutron-deficient isotopes257,258105 were produced in the reaction27Al+236u in 6n and 5n evaporation channels, respectively. The evaporation residues emerging from the target were separated in-flight from the projectiles and from products of different nuclear reactions by the electrostatic separator VASSILISSA [1]. The isotopes were then implanted into position-sensitive silicon detectors and identified using the α-α-correlation method. The measured production cross-section is σ(5n)=(0.45±0.20)nb atE P =154 MeV and σ(6n)=(0.075±0.055) nb atE P =163 MeV. These cross-sections are compared with data measured for the same isotopes in the more symmetrical reaction50Ti+209Bi.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01291709

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7

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Identification of neutron-deficient isotopes226,227Np (1990)

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

Springer

The European physical journal 336 (1990), S. 473-474

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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 The neutron-deficient isotopes226Np and227Np were produced in the bombardment of a 380μg/cm2 209Bi target with22Ne projectiles at an incident beam energy of 5.5 MeV/u. They were identified using the α-α time-correlation method /1/.226Np was found to decay with Eα=(8044±20) keV andT 1/2=(31±8) ms. For227Np two α-lines were observed at (7650±20) keV and (7677±20) keV with a half-life of (510±60) ms. The gas-filled separator NASE installed at GSI Darmstadt was used to separate the evaporation residues inflight.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01294121

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8

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Decay properties of neutron-deficient nuclei in the region Z = 86-92 (2000)

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

Springer

The European physical journal 8 (2000), S. 521-535

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ISSN: 1434-601X

Keywords: PACS. 23.60.+e α decay – 27.90.+b 220 ≤A

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Neutron deficient isotopes of elements Z = 86-92 have been produced by heavy-ion fusion reactions 12C + 208Pb, 209Bi, 22Ne + 208Pb, 51V + 170Er, and 50Ti + 170Er. The evaporation residues were investigated by means of α- and α-γ-spectroscopy after in-flight separation from the projectile beam by the velocity filter SHIP and implantation into a 16-strip position-sensitive Si-detector. New or improved decay data for 225, 226U, 216, 217m, 218Pa, 215, 216, 217Th, 214, 215, 216, 216mAc, 214Ra and 213Rn have been obtained.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500070075

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