Transfer products from the reactions of heavy ions with heavy nuclei. [394 to 1156 MeV]

Technical Report · Thu Nov 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5501822· OSTI ID:5501822

Thomas, III, K E

Production of nuclides heavier than the target from /sup 86/Kr- and /sup 136/Xe-induced reactions with /sup 181/Ta and /sup 238/U was investigated. Attempts were made to produce new neutron-excess Np and Pu isotopes by the deep inelastic mechanism. No evidence was found for /sup 242/Np or /sup 247/Pu. Estimates were made for the production of /sup 242/Np, /sup 247/Pu, and /sup 248/Am from heavy-ion reactions with uranium targets. Comparisons of reactions of /sup 86/Kr and /sup 136/Xe ions with thick /sup 181/Ta targets and /sup 86/Kr, /sup 136/Xe and /sup 238/U ions with thick /sup 238/U targets indicate that the most probable products are not dependent on the projectile. The most probable products can be predicted by the equation Z - Z/sub target/ = 0.43 (A - A/sub target/) + 1.0. The major effect of the projectile is the magnitude of the production cross section of the heavy products. Based on these results, estimates are made of the most probable mass of element 114 produced from heavy-ion reactions with /sup 248/Cm and /sup 254/Es targets. These estimates give the mass number of element 114 as approx. 287 if produced in heavy-ion reactions with these very heavy targets. Excitation functions of gold and bismuth isotopes arising from /sup 86/Kr- and /sup 136/Xe-induced reactions with thin /sup 181/Ta targets were measured. These results indicate that the shape and location (in Z and A above the target) of the isotopic distributions are not strongly dependent on the projectile incident energy. Also, the nuclidic cross sections are found to increase with an increase in projectile energy to a maximum at approximately 1.4 to 1.5 times the Coulomb barrier. Above this maximum, the nuclidic cross sections are found to decrease with an increase in projectile energy. This decrease in cross section is believed to be due to fission of the heavy products caused by high excitation energy and angular momentum. 111 references, 39 figures, 34 tables.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5501822
• Report Number(s): LBL-9886
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDES
AMERICIUM
BISMUTH
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DATA FORMS
DEEP INELASTIC HEAVY ION REACTIONS
ELEMENT 114
ELEMENTS
ENERGY RANGE
EXCITATION FUNCTIONS
EXPERIMENTAL DATA
GEV RANGE
GEV RANGE 01-10
GOLD
GRAPHS
HEAVY ION REACTIONS
INFORMATION
IRIDIUM
ISOTOPES
KINETICS
KRYPTON 86 REACTIONS
MASS NUMBER
MERCURY
METALS
MEV RANGE
MEV RANGE 100-1000
NEPTUNIUM ISOTOPES
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUMERICAL DATA
PLATINUM
PLATINUM METALS
PLUTONIUM
REACTION KINETICS
REFRACTORY METALS
TABLES
TANTALUM 181 TARGET
TARGETS
THALLIUM
TRANS 104 ELEMENTS
TRANSITION ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
URANIUM 238 REACTIONS
URANIUM 238 TARGET
XENON 136 REACTIONS