K$sup -$-MESON CAPTURES BY BOUND NEUTRONS

Journal Article · Sat Mar 01 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.109.1770· OSTI ID:4325801

Gilbert, F C; White, R S

Experimental data are presented for K/sup -/-meson captures on bound neutrons and on two bound nucleons. K/sup -/-capture stars of only one prong and of only two prongs which are gray or black were analyzed in an effort to understand the basic neutron and 2 nucleon capture reactions. The same model that was used to explain the captures on bound protons has been extended to apply to bound neutrons. The average SIGMA -hyperon nuclear potential is determined to be 35 plus or minus 10 Mev attractive. This potential, coupled with the previously determined Coulomb potential of 10 plus or minus 3 Mev and the momentum of the capture nucleon, causes an estimated /sup 0/ pi /sup -/, and DELTA /sup +/ pi /sup -/, respectively, to be trapped in hound energy states. This high trapping probability leads to a high escape probability of 0.8 plus or minus 0.1 for SIGMA hyperons in unbound states and a corresponding SIGMA /sup +/- or E/sup -/-hyperon charge exchange cross section of 11/sub -6/ millibarns per neutron or proton, respectively, in the Ag nucleus. The proton-to-neutron K/ sup -/--capture ratio is found to be 4/sub -2//sup +4/. The fraction of K/sup -/- captures on neutrons that leads to the reaction DELTA /sup 0/ pi /sup -/ is 0.00/sub -0.0//sup +0.13/. The results indicate that most of the K/sup -/- mesons are captured in the interior of the nucleus. The numbers of multinucleon K/sup -/ captures which occur by the reactions SIGMA /sup +/n, SIGMA /sup -/p, and SIGMA /sup -/n are estimated t o be 1.3/sub -0.9//sup +2.2/, 0.0/sub -0.0// sup +1.5/, and 0.4/sub -0.4/ /sup +1.0 /%, respectively. The data of this experiment are consistent with the reaction rates of 2: 1: 1 1/4: 0: 1/2: 1/2:0 for SIGMA /sup -/ pi /sup +/, SIGMA /sup +/ pi /sup -/, SIGMA /sup 0/ pi /syo 0/, DELTA /sup 0/ pi /sup 0/, ly. (auth)

• Research Organization: Univ. of California, Livermore
• NSA Number: NSA-12-007986
• OSTI ID: 4325801
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 109; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
BEAMS
BINDING ENERGY
BOUND STATE
CAPTURE
CHARGE EXCHANGE
CROSS SECTIONS
ELECTRIC CHARGES
ELECTRIC POTENTIAL
INTERACTIONS
KAONS
LAMBDA PARTICLES
MEASURED VALUES
MESONS
MOMENTUM
NEUTRONS
NUCLEAR STRUCTURE
NUCLEONS
PARTICLE MODELS
PARTICLE TRACKS
PHYSICS
PIONS
SCATTERING
SIGMA PARTICLES
SILVER
TARGETS