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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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