Spontaneous fission properties of sub 103 sup 259 Lr

Journal Article · Sun Nov 01 00:00:00 EST 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.46.1873· OSTI ID:7156731

Hamilton, T M; Gregorich, K E; Lee, D M; Czerwinski, K R; Hannink, N J; Kacher, C D; Kadkhodayan, B; Kreek, S A; Nurmia, M J; Lane, M R; Neu, M P; Tuerler, A; Hoffman, D C ^[1]

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

We have measured the mass and kinetic-energy distributions of fragments from the spontaneous fission of {sup 259}Lr. The {sup 259}Lr was produced via the {sup 248}Cm ({sup 15}N,4{ital n}) reaction with a production cross section of 100 nb using 81-MeV projectiles. The kinetic energies and times of the alpha particles and coincident fission fragments were measured using our rotating wheel system. From these data the half-life, mass, and kinetic-energy distributions were derived. The total kinetic-energy (TKE) distribution appears to consist of a single component with a most probable pre-neutron-emission TKE of 215{plus minus}3 MeV. The mass distribution is predominantly symmetric with a full width at half maximum of about 20 mass numbers. These results are consistent with trends observed for other trans-berkelium spontaneously fissioning isotopes. We determined the half-life to be 6.14{plus minus}0.36 s by measuring its alpha decay and the observed spontaneous fission half-life was consistent with that value. An energy of 8.439{plus minus}0.010 MeV was measured for the main alpha transition of {sup 259}Lr. We measured a spontaneous fission to alpha-decay ratio of 0.25{plus minus}0.03 which results in a partial half-life for spontaneous fission of 31{plus minus}4 s, if there are no other appreciable modes of decay.

• OSTI ID: 7156731
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 46:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
CURIUM 248 TARGET
DATA
DAYS LIVING RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FISSION
FISSION FRAGMENTS
HADRONS
HALF-LIFE
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
HEAVY NUCLEI
INFORMATION
ISOTOPES
LAWRENCIUM 259
LAWRENCIUM ISOTOPES
MEV RANGE
MEV RANGE 10-100
NEUTRONS
NITROGEN 15 REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES