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Experimental Study ...
Experimental Study of the 238U(36S,3-5n)269-271Hs Reaction Leading to the Observation of 270Hs
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Graeger, R. (author)
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Ackermann, D. (author)
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Chelnokov, M. (author)
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Chepigin, V. (author)
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Düllmann, Ch. E. (author)
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Dvorak, J. (author)
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Even, J. (author)
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Gorshkov, A. (author)
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Heßberger, F. P. (author)
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Hild, D. (author)
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Hübner, A. (author)
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Jäger, E. (author)
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Khuyagbaatar, J. (author)
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Kindler, B. (author)
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Kratz, J. V. (author)
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Krier, J. (author)
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Kuznetsov, A. (author)
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Lommel, B. (author)
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Nishio, K. (author)
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Nitsche, H. (author)
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Omtvedt, J. P. (author)
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Petrushkin, O. (author)
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- Rudolph, Dirk (author)
- Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Runke, J. (author)
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Samadani, F. (author)
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Schädel, M. (author)
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Schausten, B. (author)
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Türler, A. (author)
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Yakushev, A. (author)
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Zhi, Q. (author)
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(creator_code:org_t)
- 2010
- 2010
- English.
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In: Physical Review C (Nuclear Physics). - 0556-2813. ; 81:6
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http://dx.doi.org/10...
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https://doi.org/10.1...
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Abstract
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- The deformed doubly magic nucleus (270)Hs has so far only been observed as the four-neutron (4n) evaporation residue of the reaction Mg-26+Cm-248, where a maximum cross section of 3 pb was measured. Theoretical studies on the formation of (270)Hs in the 4n evaporation channel of fusion reactions with different entrance channel asymmetry in the framework of a two-parameter Smoluchowski equation predict that the reactions Ca-48+Ra-226 and S-36+U-238 result in higher cross sections due to lower reaction Q values, in contrast to simple arguments based on the reaction asymmetry, which predict opposite trends. Calculations using HIVAP predict cross sections for the reaction S-36+U-238 that are similar to those of the Mg-26+Cm-248 reaction. Here, we report on the first measurement of evaporation residues formed in the complete nuclear fusion reaction S-36+U-238 and the observation of (270)Hs, which is produced in the 4n evaporation channel, with a measured cross section of 0.8(-0.7)(+2.6) pb at 51-MeV excitation energy. The one-event cross-section limits (68% confidence level) for the 3n, 4n, and 5n evaporation channels at 39-MeV excitation energy are 2.9 pb, while the cross-section limits of the 3n and 5n channel at 51 MeV are 1.5 pb. This is significantly lower than the 5n cross section of the Mg-26+Cm-248 reaction at similar excitation energy.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Graeger, R.
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Ackermann, D.
-
Chelnokov, M.
-
Chepigin, V.
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Düllmann, Ch. E.
-
Dvorak, J.
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show more...
-
Even, J.
-
Gorshkov, A.
-
Heßberger, F. P.
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Hild, D.
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Hübner, A.
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Jäger, E.
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Khuyagbaatar, J.
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Kindler, B.
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Kratz, J. V.
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Krier, J.
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Kuznetsov, A.
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Lommel, B.
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Nishio, K.
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Nitsche, H.
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Omtvedt, J. P.
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Petrushkin, O.
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Rudolph, Dirk
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Runke, J.
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Samadani, F.
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Schädel, M.
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Schausten, B.
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Türler, A.
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Yakushev, A.
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Zhi, Q.
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show less...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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Physical Review ...
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Lund University