Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

The weak decay of lambda hypernuclei

Technical Report ·
OSTI ID:6540874

Experimental technique and results from a study of the weak decay modes of /sub ..lambda..//sup 5/He are presented. The weak decay modes of lambda hypernuclei include the mesonic decays (..lambda../..-->.. p + ..pi../sup -/ and ..lambda.. ..-->.. n + ..pi../sup 0/) and the nonmesonic decay modes (..lambda.. + p ..-->.. n + p and ..lambda.. + n ..-->.. n + n) the /sub ..lambda..//sup 5/He hypernuclei were produced with the K/sup -/ + /sup 6/Li ..-->.. ..pi../sup -/ +/sub ..lambda.. /sup 6/Li ..pi../sup -/ + ..lambda..//sup 6/Li reaction followed by the strong decay /sub ..lambda..//sup 6/Li ..-->.. /sub ..lambda..//sup 5/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 (LESBI) 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 /sub ..lambda..//sup 5/He nonmesonic weak decay rates. The results are also compared to /sub ..lambda..//sup 12/C weak decay rates previously measured by the CMU-BNL-Houston-New Mexico-Vassar collaboration. 57 refs., 98 figs., 26 tabs.

Research Organization:
Carnegie-Mellon Univ., Pittsburgh, PA (USA). Dept. of Physics
DOE Contract Number:
FG02-87ER40315
OSTI ID:
6540874
Report Number(s):
DOE/ER/40315-136; ON: DE87009764
Country of Publication:
United States
Language:
English

Similar Records

Weak decay of lambda hypernuclei
Thesis/Dissertation · Wed Dec 31 23:00:00 EST 1986 · OSTI ID:5919565
Mesonic and nonmesonic weak decay widths of medium-heavy {lambda} hypernuclei
Journal Article · Mon Jan 31 23:00:00 EST 2005 · Physical Review. C, Nuclear Physics · OSTI ID:20695960
The weak decay of helium hypernuclei
Technical Report · Sat Aug 01 00:00:00 EDT 1992 · OSTI ID:6831977

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
BARYONS
BOSONS
BROOKHAVEN AGS
CARBON 12
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
FIELD THEORIES
HADRON REACTIONS
HADRONS
HELIUM 5
HELIUM ISOTOPES
HYPERNUCLEI
HYPERONS
ISOTOPES
KAON MINUS REACTIONS
KAON REACTIONS
LAMBDA BARYONS
LAMBDA PARTICLES
LIGHT NUCLEI
LITHIUM 6
LITHIUM 6 TARGET
LITHIUM ISOTOPES
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESON REACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
ODD-ODD NUCLEI
PARTICLE MODELS
PIONS
PIONS MINUS
PROTONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SPECTROMETERS
STABLE ISOTOPES
STRANGE PARTICLES
SYNCHROTRONS
TARGETS
TIME-OF-FLIGHT SPECTROMETERS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
WEINBERG-SALAM GAUGE MODEL