Weak decay of lambda hypernuclei

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5919565

Szymanski, J J

Experimental technique and results from a study of the weak decay modes of 5/..lambda..He are presented. The weak decay modes of lambda hypernuclei include the mesonic decays and the nonmesonic decay modes. The 5/..lambda..He hypernuclei were produced with the K/sup -/ + /sup 6/Li ..-->.. ..pi../sup -/ + 6/..lambda.. Li reaction followed by the strong decay 6/..lambda.. Li ..-->.. 5/..lambda.. He + p. The incoming K/sup -/ momentum was 800 MeV/c and the K-..pi.. angle was 10/sup 0/. The experiment was performed on the Low Energy Separated Beam (LESB I) at the Brookhaven National Laboratory AGS. The protons from the nonmesonic decay branch and the negative pion from the mesonic decay branch were detected in a 14 element scintillator range spectrometer. The neutrons from the nonmesonic decay branch were detected in an 18 element time-of-flight neutron detector array. The partial rates for all four of the decay modes are measured in this experiment. The total decay rate is also measured. The result for the total decay rate is 1.03 +/- 0.08 in units of the free lambda decay rate. The results are compared to several calculations of 5/..lambda.. He nonmesonic weak decay rates. The results are also compared to 12/..lambda..C weak decay rates previously measured by the CMU-BNL-Houston-New Mexico-Vassar collaboration.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (USA)
• OSTI ID: 5919565
• Country of Publication: United States
• Language: English

Related Subjects

645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
651220* -- Nuclear Properties & Reactions
A=1-5
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
BARYONS
BOSONS
BRANCHING RATIO
BROOKHAVEN AGS
CHARGED-PARTICLE REACTIONS
CYCLIC ACCELERATORS
DATA
DECAY
ELEMENTARY PARTICLES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
HADRON REACTIONS
HADRONS
HELIUM 5
HELIUM ISOTOPES
HYPERNUCLEI
HYPERONS
INFORMATION
ISOTOPES
KAON MINUS REACTIONS
KAON REACTIONS
LAMBDA BARYONS
LAMBDA PARTICLES
LIGHT NUCLEI
LITHIUM 6
LITHIUM 6 TARGET
LITHIUM ISOTOPES
MESON REACTIONS
MESONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
PARTICLE DECAY
PIONS
PIONS MINUS
PSEUDOSCALAR MESONS
RADIOISOTOPES
STABLE ISOTOPES
STRANGE PARTICLES
SYNCHROTRONS
TARGETS
WEAK HADRONIC DECAY
WEAK PARTICLE DECAY