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

被引：240

作者：

Duellmann, Ch. E. ^{[1
]}

Schaedel, M. ^{[1
]}

Yakushev, A. ^{[2
]}

Tuerler, A. ^{[2
]}

Eberhardt, K. ^{[3
]}

Kratz, J. V. ^{[3
]}

Ackermann, D. ^{[1
]}

Andersson, L. -L. ^{[4
]}

Block, M. ^{[1
]}

Bruechle, W. ^{[1
]}

Dvorak, J. ^{[5
]}

Essel, H. G. ^{[1
]}

Ellison, P. A. ^{[5
]}

Even, J. ^{[3
]}

Gates, J. M. ^{[1
,2
]}

Gorshkov, A. ^{[2
]}

Graeger, R. ^{[2
]}

Gregorich, K. E. ^{[5
]}

Hartmann, W. ^{[1
]}

Herzberg, R. -D. ^{[4
]}

Hessberger, F. P. ^{[1
]}

Hild, D. ^{[3
]}

Huebner, A. ^{[1
]}

Jaeger, E. ^{[1
]}

Khuyagbaatar, J. ^{[1
]}

Kindler, B. ^{[1
]}

Krier, J. ^{[1
]}

Kurz, N. ^{[1
]}

Lahiri, S. ^{[6
]}

Liebe, D. ^{[3
]}

Lommel, B. ^{[1
]}

Maiti, M. ^{[6
]}

Nitsche, H. ^{[5
]}

Omtvedt, J. P. ^{[7
]}

Parr, E. ^{[4
]}

Rudolph, D. ^{[8
]}

Runke, J. ^{[3
]}

Schausten, B. ^{[1
]}

Schimpf, E. ^{[1
]}

Semchenkov, A. ^{[7
]}

Steiner, J. ^{[1
]}

Thoerle-Pospiech, P. ^{[3
]}

Uusitalo, J. ^{[9
]}

Wegrzecki, M. ^{[10
]}

Wiehl, N. ^{[3
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany

[2] Tech Univ Munich, D-85748 Garching, Germany

[3] Johannes Gutenberg Univ Mainz, D-55128 Mainz, Germany

[4] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England

[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[6] Saha Inst Nucl Phys, Kolkata 700064, W Bengal, India

[7] Univ Oslo, N-0315 Oslo, Norway

[8] Lund Univ, S-22100 Lund, Sweden

[9] Univ Jyvaskyla, Jyvaskyla 40014, Finland

[10] Inst Electr Mat Technol, PL-02668 Warsaw, Poland

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 25期

关键词：

HALF-LIVES; GSI; CHEMISTRY;

D O I：

10.1103/PhysRevLett.104.252701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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