A study of intranuclear rescattering in. nu. sub. mu. -Ne versus. nu. sub. mu. -D interactions: Implications for nucleon decay searches

Technical Report · Tue May 01 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/7161808· OSTI ID:7161808

Merenyi, R C

Pion intranuclear rescattering rates are determined for processes which can distort reaction final states observed and/or searched for in nucleon decay experiments. We compare the interactions of low energy neutrinos with neon versus deuterium nuclei, weighted to simulate the atmospherically-induced spectrum. The pion charge exchange and absorption rates, expressed as probabilities per final state pion, are measured to be 0.05 {plus minus} 0.09 and 0.23 {plus minus} 0.08, respectively. Using the excess momentum degraded, backscattered pions in neon relative to deuterium, we measure a lower limit for {pi}{sup {minus}} inelastic rescattering to be 0.11 {plus minus} 0.10 and for {pi}{sup +} to be 0.03 {plus minus} 0.04. The apparent charge dependence of {pi}{sup {plus minus}} inelastic rates may be associated with abundant {Delta}{sup ++} production in threshold {nu}{sub {mu}} interactions. The resonance lifetime allows transport'' of {pi}{sup +} mesons to the lower density nuclear periphery, prior to {Delta}{sup ++} {yields} p{pi}{sup +} decay. The pion rescattering rates are used to calibrate a simple phenomenological cascade model for A = 20. The model enables extrapolation of pion rescattering rates for higher atomic number nuclei, e.g. argon and iron, detector media which are being employed in second generation current nucleon decay searches.

• Research Organization: Tufts Univ., Medford, MA (USA). Dept. of Physics and Astronomy
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-83ER40085
• OSTI ID: 7161808
• Report Number(s): DOE/ER/40085-19; ON: DE90010662
• Country of Publication: United States
• Language: English

Related Subjects

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651420* -- Nuclear Properties & Reactions
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
BARYONS
CHARGE EXCHANGE
CHARGED-PARTICLE REACTIONS
DATA
DECAY
DELTA BARYONS
DEUTERIUM
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
FERMIONS
FLUIDS
GASES
HADRON REACTIONS
HADRONS
HYDROGEN ISOTOPES
INELASTIC SCATTERING
INFORMATION
ISOTOPES
LEPTON REACTIONS
LIGHT NUCLEI
MESON REACTIONS
N BARYONS
NEON
NEUTRINO REACTIONS
NONMETALS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-ODD NUCLEI
PARTICLE DECAY
PION REACTIONS
RARE GASES
SCATTERING
STABLE ISOTOPES