Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs

Research output: Contribution to journalLetter


title = "Production and Decay of Element 114: High Cross Sections and the New Nucleus 277Hs",
abstract = "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.",
author = "D{\"u}llmann, {Ch. E.} and M. Sch{\"a}del and A. Yakushev and A. T{\"u}rler and K. Eberhardt and Kratz, {J. V.} and D. Ackermann and Andersson, {L. -L.} and M. Block and W. Br{\"u}chle and J. Dvorak and Essel, {H. G.} and Ellison, {P. A.} and J. Even and Gates, {J. M.} and A. Gorshkov and R. Graeger and Gregorich, {K. E.} and W. Hartmann and Herzberg, {R. -D.} and He{\ss}berger, {F. P.} and D. Hild and A. Huebner and E. J{\"a}ger and J. Khuyagbaatar and B. Kindler and J. Krier and N. Kurz and S. Lahiri and D. Liebe and B. Lommel and M. Maiti and H. Nitsche and Omtvedt, {J. P.} and E. Parr and Dirk Rudolph and J. Runke and B. Schausten and E. Schimpf and A. Semchenkov and J. Steiner and P. Th{\"o}rle-Pospiech and J. Uusitalo and M. Wegrzecki and N. Wiehl",
year = "2010",
doi = "10.1103/PhysRevLett.104.252701",
language = "English",
volume = "104",
journal = "Physical Review Letters",
issn = "1079-7114",
publisher = "American Physical Society",
number = "25",