Parameterization of short-range time-irreversibility in nuclear forces

Technical Report · Thu Jan 01 04:00:00 EST 1976

DOI:https://doi.org/10.2172/7323316· OSTI ID:7323316

Binstock, J.; Bryan, R.; Gersten, A.

The observation that, in a time-irreversible one-boson-exchange nucleon-nucleon potential model due to Bryan and Gersten, T-violation occurs mostly in the lowest-permitted angular momentum states, leads to construct a phase-shift parameterization of the 50 to 450 MeV NN data where T-violation takes place only in the lowest possible angular momentum states. The five ordinary (T-symmetric) Wolfenstein amplitudes are taken from phase shift analysis, and the sixth, T-asymmetric amplitude, t(theta), is parameterized by a single infinitesimal phase parameter lambda/sub 1/ (lambda/sub 2/) in the case of np (pp) scattering. This leads to unique predictions for the relative angular distributions of time-reversal-asymmetric observables P - A and P/sub A/ - P/sub B/, even though the absolute magnitudes remain undertermined. The model corresponds to an ordinary interaction that yields the usual experimental data, plus a superimposed very short-range T-noninvariant force. As such, it directs experimentalists to those angular regions of pp and np P - A and P/sub A/ - P/sub B/ measurements where T-violation due to short-range forces will be most strongly manifest. As the model incorporates isospin invariance, known to hold only at the few-percent level in np scattering, the predictions are likely to have the greatest significance in the case of pp scattering.

• Research Organization: Texas A and M Univ., College Station (USA). Dept. of Physics
• OSTI ID: 7323316
• Report Number(s): ORO-5223-03
• Country of Publication: United States
• Language: English

Related Subjects

645207 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions
Baryon No. Greater than 1-- (-1987)
653001* -- Nuclear Theory-- Nuclear Structure
Moments
Spin
& Models
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
ASYMMETRY
BARYON-BARYON INTERACTIONS
BOSON-EXCHANGE MODELS
DISTRIBUTION
ENERGY RANGE
HADRON-HADRON INTERACTIONS
INTERACTIONS
INVARIANCE PRINCIPLES
ISOSPIN
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR FORCES
NUCLEON-NUCLEON INTERACTIONS
NUCLEON-NUCLEON POTENTIAL
OBE MODEL
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
PHASE SHIFT
PROTON-NEUTRON INTERACTIONS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
T INVARIANCE
WOLFENSTEIN PARAMETERS