248Cm(22Ne,xn)270-xSg reaction and the decay properties of 265Sg reexamined

被引：49

作者：

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

Tuerler, A. ^{[2
]}

机构：

[1] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany

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

来源：

PHYSICAL REVIEW C | 2008年 / 77卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.77.064320

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Recent studies of the hot fusion reaction Cm-248(Mg-26,xn)(274-x)Hs have provided new nuclear decay data on (265,266)Sg and confirmed the existence of an isomeric state in (261)Rf. The results reported in [J. Dvorak , Phys. Rev. Lett. 100, 132503 (2008)] suggest that all decay chains observed in previous studies of the reaction Cm-248(Ne-22,xn)(270-x)Sg, which were originally attributed to (266)Sg, originated from (265)Sg. Here, the decay properties of (265)Sg are reevaluated. Indications for the existence of an isomeric state in (265)Sg are found. The half-lives and main alpha particle energies of the two (265)Sg states are 8.9 s/8.85 MeV and 16.2 s/8.70 MeV, respectively. Direct production of this isotope as an evaporation residue of a nuclear fusion reaction populates both states with similar intensity while alpha decay of (269)Hs into (265)Sg preferentially populates the longer-lived state, which in turn decays almost exclusively into the short-lived state in (261)Rf. The cross section of the reaction Cm-248(Ne-22,5n)(265)Sg is reanalyzed and found to be of the order of a few hundred pb, assuming that alpha decay is the only decay mode of (265)Sg. A decay scheme that is consistent with the published data on (265)Sg and (261)Rf is proposed, which can serve as a working hypothesis in the design of new experiments dedicated to study the production and decay of these two isotopes.

引用

页数：10

共 46 条

[1] Experimental identification of spin-parities and single-particle configurations in 257No and its α-decay daughter 253Fm -: art. no. 102502 [J].

Asai, M ;

Tsukada, K ;

Sakama, M ;

Ichikawa, S ;

Ishii, T ;

Nagame, Y ;

Nishinaka, I ;

Akiyama, K ;

Osa, A ;

Oura, Y ;

Sueki, K ;

Shibata, M .

PHYSICAL REVIEW LETTERS, 2005, 95 (10)

[2]

ASAI M, 2007, 3 INT C CHEM PHYS TR

[3]

Asai M, COMMUNICATION

[4] SHELL STRUCTURE OF THE HEAVIEST ELEMENTS [J].

CWIOK, S ;

HOFMANN, S ;

NAZAREWICZ, W .

NUCLEAR PHYSICS A, 1994, 573 (03) :356-394

[5] Physical preseparation:: A powerful new method for transactinide chemists [J].

Duellmann, Ch. E. .

EUROPEAN PHYSICAL JOURNAL D, 2007, 45 (01) :75-80

[6] Heavy-ion-induced production and physical preseparation of short-lived isotopes for chemistry experiments [J].

Düllmann, CE ;

Folden, CM ;

Gregorich, KE ;

Hoffman, DC ;

Leitner, D ;

Pang, GK ;

Sudowe, R ;

Zielinski, PM ;

Nitsche, H .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2005, 551 (2-3) :528-539

[7] IVO, a device for In situ Volatilization and On-line detection of products from heavy ion reactions [J].

Düllmann, CE ;

Eichler, B ;

Eichler, R ;

Gäggeler, HW ;

Jost, DT ;

Piguet, D ;

Türler, A .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2002, 479 (2-3) :631-639

[8] Chemical investigation of hassium (element 108) [J].

Düllmann, CE ;

Brüchle, W ;

Dressler, R ;

Eberhardt, K ;

Eichler, B ;

Eichler, R ;

Gäggeler, HW ;

Ginter, TN ;

Glaus, F ;

Gregorich, KE ;

Hoffman, DC ;

Jäger, E ;

Jost, DT ;

Kirbach, UW ;

Lee, DM ;

Nitsche, H ;

Patin, JB ;

Pershina, V ;

Piguet, D ;

Qin, Z ;

Schädel, M ;

Schausten, B ;

Schimpf, E ;

Schött, HJ ;

Soverna, S ;

Sudowe, R ;

Thörle, P ;

Timokhin, SN ;

Trautmann, N ;

Türler, A ;

Vahle, A ;

Wirth, G ;

Yakushev, AB ;

Zielinski, PM .

NATURE, 2002, 418 (6900) :859-862

[9] Doubly magic nucleus 108270Hs162 [J].

Dvorak, J. ;

Bruechle, W. ;

Chelnokov, M. ;

Dressler, R. ;

Duellmann, Ch. E. ;

Eberhardt, K. ;

Gorshkov, V. ;

Jaeger, E. ;

Kruecken, R. ;

Kuznetsov, A. ;

Nagame, Y. ;

Nebel, F. ;

Novackova, Z. ;

Qin, Z. ;

Schaedel, M. ;

Schausten, B. ;

Schimpf, E. ;

Semchenkov, A. ;

Thoerle, P. ;

Tuerler, A. ;

Wegrzecki, M. ;

Wierczinski, B. ;

Yakushev, A. ;

Yeremin, A. .

PHYSICAL REVIEW LETTERS, 2006, 97 (24)

[10] Observation of the 3n evaporation channel in the complete hot-fusion reaction 26Mg+248Cm leading to the new superheavy nuclide 271Hs [J].

Dvorak, J. ;

Bruechle, W. ;

Chelnokov, M. ;

Duellmann, Ch. E. ;

Dvorakova, Z. ;

Eberhardt, K. ;

Jaeger, E. ;

Kruecken, R. ;

Kuznetsov, A. ;

Nagame, Y. ;

Nebel, F. ;

Nishio, K. ;

Perego, R. ;

Qin, Z. ;

Schaedel, M. ;

Schausten, B. ;

Schimpf, E. ;

Schuber, R. ;

Semchenkov, A. ;

Thoerle, P. ;

Tuerler, A. ;

Wegrzecki, M. ;

Wierczinski, B. ;

Yakushev, A. ;

Yeremin, A. .

PHYSICAL REVIEW LETTERS, 2008, 100 (13)

← 1 2 3 4 5 →