期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.252701
关键词
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资金
- German BMBF [06MT247I, 06MT248, 06MZ223I]
- GSI-FE
- Swedish Science Council
- U.S. D.O.E. [DE-AC0205CH11231]
- NNSA [DE-FC5208NA28752]
- Norwegian Research Council [177538]
- government of India-XIth five year plan project TADDS
- STFC [ST/F012039/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F012039/1] Funding Source: researchfish
The fusion-evaporation reaction Pu-244(Ca-48, 3-4n)(288,289)114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of (288, 289)114. At a compound nucleus excitation energy of E* = 39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8(-3.1)(+3.9) pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0-(+7.4)(4.5) pb. In one of the 3n evaporation channel decay chains, a previously unobserved alpha branch in (281)Ds was observed ( probability to be of random origin from background: 0.1%). This alpha decay populated the new nucleus (277)Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.
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