First Direct Measurements of Superheavy-Element Mass Numbers
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-...
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| Veröffentlicht in: | Physical review letters 2018-11, Vol.121 (22), p.222501-222501 |
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| container_title | Physical review letters |
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| creator | Gates, J M Pang, G K Pore, J L Gregorich, K E Kwarsick, J T Savard, G Esker, N E Kireeff Covo, M Mogannam, M J Batchelder, J C Bleuel, D L Clark, R M Crawford, H L Fallon, P Hubbard, K K Hurst, A M Kolaja, I T Macchiavelli, A O Morse, C Orford, R Phair, L Stoyer, M A |
| description | 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. |
| doi_str_mv | 10.1103/PhysRevLett.121.222501 |
| format | Article |
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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. 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| source | American Physical Society Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
| subjects | Atomic properties Cyclotrons Decay |
| title | First Direct Measurements of Superheavy-Element Mass Numbers |
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