Delayed neutron emission probabilities of Li-F nuclides

Conference · Fri Sep 01 04:00:00 EDT 1989

OSTI ID:5148626

Reeder, P L; Warner, R A; Hensley, W K ^[1]; Vieira, D J; Wouters, J M ^[2]

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1. Pacific Northwest Lab., Richland, WA (USA)
2. Los Alamos National Lab., NM (USA)

Delayed neutron emission probabilities (P{sub n}) have been measured for 18 nuclides ranging from {sup 9}Li to {sup 25}F. Neutron-rich nuclides were produced by reaction of 800 MeV p on a {sup 232}Th target at the LAMPF accelerator at Los Alamos National Laboratory. Recoil nuclides were individually identified as to their mass, nuclear charged, and ionic charge by use of the Time-of-Flight Isochronous (TOFI) spectrometer. The distribution of time intervals between the arrival of a specific ion and the subsequent detection of a neutron was determined. The P{sub n} was calculated from the total number of ions observed, the initial neutron count rate, the neutron counting efficiency, and the half-life. The technique is shown to be valid for half-lives ranging from 10 ms ({sup 15}B) to 4 s ({sup 17}N) and for P{sub n} values as low as 0.3% ({sup 13}B). Delayed neutron emission has been measured for {sup 12}Be, {sup 14}B, {sup 17}C, {sup 18}N, {sup 21}N, and {sup 25}F for the first time. A small branch for beta-delayed two-neutron emission was observed in {sup 15}B (P{sub 2n} = 0.4 {plus minus} 0.2%). 14 refs., 6 figs., 1 tab.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5148626
• Report Number(s): PNL-SA-16931; CONF-890902--22; ON: DE90005541
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METALS
ALKALINE EARTH METALS
BARYONS
BEAM TRANSPORT
BERYLLIUM
BETA-DELAYED NEUTRONS
BORON
CARBON
CHEMICAL ANALYSIS
DATA ACQUISITION SYSTEMS
DATA ANALYSIS
DELAYED NEUTRON ANALYSIS
DETECTION
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
FERMIONS
FLUORINE
HADRONS
HALF-LIFE
HALOGENS
LITHIUM
MEASURING INSTRUMENTS
METALS
NEUTRON DETECTION
NEUTRON EMISSION
NEUTRONS
NITROGEN
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUCLEAR REACTION ANALYSIS
NUCLEONS
RADIATION DETECTION
SEMIMETALS
SPECTROMETERS
TIME-OF-FLIGHT SPECTROMETERS