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Fission of highly excited fragments from collisions of 750 A.MeV 238U-ions on 208Pb (1998)

Schwab, W. ; Bernas, M. ; Armbruster, P. ; [et al.]

Springer

The European physical journal 2 (1998), S. 179-191

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ISSN: 1434-601X

Keywords: PACS:25.85.-w Fission reactions – 25.75.-q Relativistic heavy-ion collosions

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: Fragments of relativistic 750 A.MeV U-projectiles were investigated by using the fragment separator FRS for magnetic selection of reaction products including ray-tracing and ΔE-ToF techniques. For elements between Ge and Sb, measurements of isotopic yield distributions and velocities revealed three processes: fragmentation, low-energy fission, and high-energy fission. The last of these regimes is presently reported. First and second moments of distributions of mass numbers, atomic numbers and velocities of the corresponding fragments allowed us to identify 101 43Tc56 as the most probable fragment of a high energy symmetric fission reaction. Moreover, we could deduce a hypothetical mean fissioning fragmentation product 208Rn and its highly excited pre-fragmentation parent 227Ra produced in a primary abrasion reaction at an excitation energy of about 290 MeV.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100500050107

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Production and identification of heavy Ni isotopes: evidence for the doubly magic nucleus 28 78 Ni (1995)

Engelmann, Ch. ; Ameil, F. ; Armbruster, P. ; [et al.]

Springer

The European physical journal 352 (1995), S. 351-352

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ISSN: 1434-601X

Keywords: 21.60.C5 ; 27.50+e ; 25.85-w

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We report the first observation of the doubly magic nucleus78Ni50 and the heavy isotopes77Ni,73,74,75Co,80Cu. The isotopes were produced by nuclear fission in collisions of 750 A·MeV projectiles of238U on Be target nuclei. The fully-stripped fission products were separated in-flight by the fragment separator FRS and identified event-by-event by measuring the magnetic rigidity, the trajectory, the energy deposit, and the time of flight. Production cross-sections and fission yields for the new Ni-isotopes are given.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01299748

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