Synthesis of rutherfordium isotopes in the 238U(26Mg, xn)264-xRf reaction and study of their decay properties

Journal Article · Tue Jan 15 00:00:00 EST 2008 · Physical Review C

OSTI ID:925915

Gates, Jacklyn M; Gates, J M; Garcia, M A; Gregorich, K E; Dullmann, Ch E; Dragojevic, I; Dvorak, J; Eichler, R; Folden, III, C M; Loveland, W; Nelson, S L; Pang, G K; Stavsetra, L; Sudowe, R; Turler, A; Nitsche, H

Isotopes of rutherfordium (258-261Rf) were produced in irradiations of 238U targets with 26Mg beams. Excitation functions were measured for the 4n, 5n and 6n exit channels. Production of 261Rf in the 3n exit channel with a cross section of 28+92-26 pb was observed. Alpha decay of 258Rf was observed for the first time with an alpha-particle energy of 9.05+-0.03 MeV and an alpha/total decay branching ratio of 0.31+-0.11. In 259Rf, the electron capture/total decay branching ratio was measured to be 0.15+-0.04. The measured half-lives for 258Rf, 259Rf and 260Rf were 14.7+1.2-1.0 ms, 2.5+0.4-0.3 s and 22.2+3.0-2.4 ms, respectively, in agreement with literature data. The systematics of the alpha decay Q values and of the partial spontaneous fission half-lives were evaluated for even-even nuclides in the region of the N = 152, Z = 100 deformed shell. The influence of the N = 152 shell on the alpha decay Q values for rutherfordium was observed to be similar to that of the lighter elements (96<_ Z<_ 102). However, the N = 152 shell does not stabilize the rutherfordium isotopes against spontaneous fission, as it does in the lighter elements (96<_ Z<_102).

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Nuclear Science Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 925915
• Report Number(s): LBNL-90E; TRN: US0802472
• Journal Information: Physical Review C, Vol. 77; Related Information: Journal Publication Date: 07 March 2008
• Country of Publication: United States
• Language: English

Related Subjects

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ALPHA DECAY
BRANCHING RATIO
CROSS SECTIONS
DECAY
ELECTRONS
EXCITATION FUNCTIONS
ISOTOPES
PRODUCTION
RUTHERFORDIUM
RUTHERFORDIUM ISOTOPES
SPONTANEOUS FISSION
SYNTHESIS
TARGETS
Rutherfordium Alpha Decay Spontaneous Fission Fusion ReactionsTEM studies of laterally overgrown GaN layersTEM studies of laterally overgrown GaN layersTEM studies of laterally overgrown GaN layersTEM studies of laterally overgrown GaN layers Binding Energies and Masses Properties of Nuclei A&gt;220