ISSN:
1434-601X
Keywords:
PACS. 21.10.Tg Lifetime – 21.60.Cs Shell model – 27.90.+b A≥ 220
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: An isotope of the element 105 with mass number 259 has been produced via the reaction 241Am(22Ne, 4n)259Db at E lab = 118 MeV. The reaction products were transported and collected using the helium-jet technique and the rotating wheel apparatus. The α-decays of the products and their daughter nuclides were detected by a set of Si(Au) detectors arranged ingeniously. The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide 255Lr established by α-recoiled milking measurement. The new nuclide 259Db has a half-life of 0.51±0.16 s and decays by alpha-particle emission of E α = 9.47 MeV. Furthermore, the nuclide 258Db and its daughter 254Lr have also been clearly observed using the same projectile-target combination. Their half-lives and α-particle energies determined in this work are in agreement with previous known data, thus also proving the reliability of our assignment of 259Db.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100500170140
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