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Open Access Publications from the University of California

First Direct Measurements of Superheavy-Element Mass Numbers.

  • Author(s): Gates, JM
  • Pang, GK
  • Pore, JL
  • Gregorich, KE
  • Kwarsick, JT
  • Savard, G
  • Esker, NE
  • Kireeff Covo, M
  • Mogannam, MJ
  • Batchelder, JC
  • Bleuel, DL
  • Clark, RM
  • Crawford, HL
  • Fallon, P
  • Hubbard, KK
  • Hurst, AM
  • Kolaja, IT
  • Macchiavelli, AO
  • Morse, C
  • Orford, R
  • Phair, L
  • Stoyer, MA
  • et al.

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An experiment was performed at Lawrence Berkeley National Laboratory's 88-in. Cyclotron to determine the mass number of a superheavy element. The measurement resulted in the observation of two α-decay chains, produced via the ^{243}Am(^{48}Ca,xn)^{291-x}Mc reaction, that were separated by mass-to-charge ratio (A/q) and identified by the combined BGS+FIONA apparatus. One event occurred at A/q=284 and was assigned to ^{284}Nh (Z=113), the α-decay daughter of ^{288}Mc (Z=115), while the second occurred at A/q=288 and was assigned to ^{288}Mc. This experiment represents the first direct measurements of the mass numbers of superheavy elements, confirming previous (indirect) mass-number assignments.

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