Comparison of complementary reactions for the production of {sup 261,262}Bh

Journal Article · Fri Aug 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.024606· OSTI ID:21192118

Nelson, S L; Folden, III, C M; Dragojevic, I; Garcia, M A; Gates, J M; Nitsche, H ^[1]; Gregorich, K E; Sudowe, R ^[1]; Duellmann, Ch E ^[1]; Eichler, R ^[2]

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1. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
2. Labor fuer Radio- und Umweltchemie, Paul Scherrer Institut, CH-5232 Villigen PSI (Switzerland)

Two heavy-ion induced fusion reactions producing {sup 261,262}Bh were studied using the Berkeley Gas-filled Separator at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. An excitation function for the production of {sup 262}Bh via the reaction {sup 209}Bi({sup 54}Cr,n){sup 262}Bh was measured with a maximum cross section from a fit to the data of 430 {+-} 110 pb observed at a compound nucleus excitation energy of 15.7 MeV. New data have been measured for the 1n exit channel of the {sup 208}Pb({sup 55}Mn, n){sup 262}Bh reaction. We present an updated excitation function with an observed maximum cross section of 530{+-}100 pb at a compound nucleus excitation energy of 14.1 MeV. Events corresponding to the 2n exit channel for the {sup 209}Bi({sup 54}Cr,2n){sup 261}Bh and {sup 208}Pb({sup 55}Mn,2n){sup 261}Bh reactions were also observed and are presented as partial excitation functions. The measured decay properties correspond well with existing experimental data. We compare these experimental results to cross section predictions from a model by Swiatecki et al. and discuss entrance channel effects on the magnitude of 1n cross sections.

• OSTI ID: 21192118
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 2; Other Information: DOI: 10.1103/PhysRevC.78.024606; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 208 TARGET
BISMUTH 209 TARGET
BOHRIUM 261
BOHRIUM 262
CHROMIUM 54
COMPARATIVE EVALUATIONS
COMPOUND NUCLEI
CROSS SECTIONS
CYCLOTRONS
DECAY
EXCITATION
EXCITATION FUNCTIONS
FORECASTING
ISOTOPE PRODUCTION
LAWRENCE BERKELEY LABORATORY
LEAD 208 TARGET
MANGANESE 55
MEV RANGE 10-100
NEUTRONS
NUCLEAR REACTIONS