P/sub n/ measurements at TRISTAN by a. beta. -n coincidence technique

Conference · Fri Aug 01 04:00:00 EDT 1986

OSTI ID:6729585

Reeder, P L; Warner, R A; Gill, R L; Piotrowski, A

Recent development of reliable, high intensity ion sources for the TRISTAN on-line mass separator facility at Brookhaven National Laboratory has greatly expanded the number of very neutron-rich fission products available. The High Temperature Thermal ion source is preferred for production of Rb, Sr, Y, Cs, Ba, and La delayed neutron precursors. Precursors ranging from Cu to Kr and from Ag to Xe are observed from the High Temperature Plasma ion source. Half-lives and delayed neutron emission probabilities (P/sub n/) are being measured for these nuclides with a high-efficiency neutron counter. A beta counter mounted inside the neutron counter permits beta decay curves to be measured simultaneously with neutron decay curves. In addition, beta-neutron coincidence and accidental decay curves are recorded. This coincidence technique gives P/sub n/ values which do not require knowledge of the beta counting efficiency (which is a major source of uncertainty in other techniques). P/sub n/ measurements for over 40 precursors will be reported. For precursors with neutron number just above the shell closure at 60, the P/sub n/ values are unusually low. This is another manifestation of the region of deformed nuclides around mass 100 which has been identified by gamma spectroscopy experiments. 23 refs., 6 figs., 2 tabs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA); Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6729585
• Report Number(s): PNL-SA-14026; CONF-8609161-2; ON: DE87005605
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BETA DECAY
COINCIDENCE METHODS
COUNTING TECHNIQUES
DATA
DECAY
DELAYED NEUTRON PRECURSORS
DELAYED NEUTRONS
ELEMENTARY PARTICLES
EMISSION
EXPERIMENTAL DATA
FERMIONS
FISSION NEUTRONS
FISSION PRODUCTS
HADRONS
HALF-LIFE
INFORMATION
ION SOURCES
ISOTOPES
MATERIALS
NEUTRON EMISSION
NEUTRONS
NUCLEONS
NUMERICAL DATA
PROBABILITY
RADIOACTIVE MATERIALS
RADIOISOTOPES