Abstract
Detailed spectroscopic information of excited nuclear states in deformed transfermium nuclei is scarce. Most of the information available today has been obtained from investigations of fine-structure α-decay. Although α decay gives access to hindrance factors and lifetimes which are strongly correlated to shell/subshell closures and the presence of isomers, only the combined use of γ and conversion electron spectroscopy allows the precise determination of excitation energy, spin and parity of nuclear levels.
In the years 2004–2009 using the GABRIELA set-up [Hauschild et al, Nucl. Instrum. Methods A560, 388 (2006)] at the focal plane of VASSILISSA separator [Malyshev et al, Nucl. Instrum. Methods A440, 86 (2000); A516, 529 (2004)] experiments with the aim of γ and electron spectroscopy of the isotopes from Fm to Lr, formed by complete fusion reactions with accelerated heavy ions were performed. In the following, the preliminary results of decay studies using α-γ and α-β coincidences at the focal plane of the VASSILISSA recoil separator are presented.
Accumulated experience allowed us to perform ion optical calculations and to design the new experimental set-up, which will collect the base and best parameters of the existing separators and complex detector systems used at the focal planes of these installations. In the near future it is planned to study neutron-rich isotopes of the Rf-Sg in the ‘hot’ fusion reactions with 22Ne incident projectiles and 242Pu, 243Am and 248Cm targets.
Similar content being viewed by others
References
Z Patyk and A Sobiczewski, Nucl. Phys. A533, 132 (1991)
S Cwiok et al, Nucl. Phys. A611, 211 (1996)
M Bender et al, Phys. Rev. C60, 034304 (1999)
A T Kruppa et al, Phys. Rev. C61, 034313 (2000)
P Reiter et al, Phys. Rev. Lett. 82, 509 (1999)
M Leino et al, Eur. Phys. J. A6, 63 (1999)
P A Butler et al, Phys. Rev. Lett. 89, 202501 (2002)
R D Humphreys et al, Phys. Rev. C69 064324 (2004)
P Reiter et al, Phys. Rev. Lett. 95 032501 (2005)
R-D Herzberg et al, Phys. Rev. C65, 014303 (2001)
J E Bastin et al, Phys. Rev. C73, 024308 (2006)
A Chatillon et al, International Symposium on Exotic Nuclei, “EXON 2004”, Peterhof, Russia, July 5–12, 2004 (World Scientific, 2005) p. 198
R-D Herzberg, J. Phys. G30, R123 (2004)
F P Hessberger et al, Eur. Phys. J. A22, 417 (2004)
F P Hessberger et al, Nucl. Instrum. Methods B204, 597 (2003)
A Chatillon et al, Eur. Phys. J. A30, 397 (2006)
F P Hessberger et al, Eur. Phys. J. A12, 57 (2001)
M Asai et al, Phys. Rev. Lett. 95, 102502 (2005)
A G Popeko et al, Phys. At. Nucl. 69, 1183 (2006)
K Hauschild et al, Nucl. Instrum. Methods A560, 388 (2006)
O N Malyshev et al, Nucl. Instrum. Methods A440, 86 (2000)
O N Malyshev et al, Nucl. Instrum. Methods A516, 529 (2004)
K Hauschild, International Symposium on Exotic Nuclei, “EXON 2009”, Sochi, Russia, September 27–October 3, 2009 (World Scientific, 2010)
K Hauschild et al, Phys. Rev. C78, 021302(R) (2008)
K Hauschild et al, Phys. Rev. C77, 047305 (2008)
A Lopez-Martens et al, Phys. Rev., C74, 044303 (2006)
A Lopez-Martens et al, Eur. Phys. J. A32, 245 (2007)
C E Bemis, et al, ORNL Annual Report (1974) 39
B Streicher, Synthesis and spectroscopic properties of transfermium isotopes with Z = 106, 106, 107, Ph.D. thesis (Comenius University, Bratislava, Slovakia, 2006)
H Bartsch et al, Nucl. Instrum. Methods 121, 185 (1974)
K H Schmidt, Eur. Phys. J. A8, 141 (2000)
P F Dittner et al, Phys. Rev. Lett. 26, 1037 (1971)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yeremin, A., Malyshev, O., Popeko, A. et al. Gamma and electron spectroscopy of transfermium isotopes at Dubna: Results and plans. Pramana - J Phys 75, 3–12 (2010). https://doi.org/10.1007/s12043-010-0060-5
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12043-010-0060-5