Electron-capture delayed fission properties of the new isotope [sup 238]Bk

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.1859· OSTI ID:5017890

Kreek, S A; Hall, H L; Gregorich, K E; Henderson, R A; Leyba, J D; Czerwinski, K R; Kadkhodayan, B; Neu, M P; Kacher, C D; Hamilton, T M; Lane, M R; Sylwester, E R; Tuerler, A; Lee, D M; Nurmia, M J; Hoffman, D C ^[1]

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1. Chemistry Department, University of California, Berkeley and Nuclear Science Division, Lawrence Berkeley Laboratory, MS-70A/3307 Berkeley, California 94720 (United States)

Electron-capture delayed fission ECDF was studied in the new isotope [sup 238]Bk produced via the [sup 241]Am(75-MeV [alpha], 7[ital n])[sup 238]Bk reaction. The half-life of the fission activity was measured to be 144[plus minus]5 seconds. The mass-yield distribution is predominantly asymmetric and the most probable preneutron emission total kinetic energy of fission is 179[plus minus]7 MeV. The ECDF mode in [sup 238]Bk was verified by an x-ray-fission coincidence experiment which indicated that the [sup 238]Cm fission lifetime is between about 10[sup [minus]15] and 10[sup [minus]9] seconds. The isotope was assigned to [sup 238]Bk through chemical separation and observation of the known 2.4-h [sup 238]Cm daughter activity. No alpha branch was observed in the decay of [sup 238]Bk. The production cross section for [sup 238]Bk is 150[plus minus]20 nb and the delayed fission probability is (4.8[plus minus]2)[times]10[sup [minus]4].

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5017890
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663210 -- Ground-State Radioactivity-- (1992-)
663470 -- Fission-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ALPHA REACTIONS
AMERICIUM 241 TARGET
BARYONS
BERKELIUM
CAPTURE
CHARGED-PARTICLE REACTIONS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FISSION
FISSION FRAGMENTS
HADRONS
HALF-LIFE
ISOTOPES
METALS
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEONS
RADIOISOTOPES
TARGETS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
YEARS LIVING RADIOISOTOPES