p-p resonances: A link between nuclear and hadronic excitations

Journal Article · Mon Oct 01 04:00:00 EDT 1979 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.20.1616· OSTI ID:5866842

Mac Gregor, M H

Evidence of resonant behavior has recently been discovered in p-p scattering, and possibly also in n-p scattering. In particular, the p-p data indicate the existence of /sup 1/D/sub 2/, /sup 3/F/sub 3/, and /sup 1/G/sub 4/ resonances at energies of approximately 2140, 2260, and 2430 MeV. The correlation between increasing l values and increasing energies that is observed in these resonances suggests a form of rotational motion. Since a virtually bound nucleon-nucleon state represents the low-mass limit of a multinucleon (nuclear) system, we logically expect the rotational behavior of this dinucleon state to follow the known systematics of nuclear physics. The rotational motion is highly nonadiabatic for this very light dinucleon system, so that an l (l + 1) energy interval rule is expected to apply, where l is the orbital angular momentum quantum number. In support of this idea, we show experimental data plots which reveal that (1) rotational bands in very light nuclei and in the dinucleon follow the expected l (l + 1) interval rule, and (2) the experimental moments of inertia of the rotating bandheads exhibit the expected A/sup 5/3/ behavior, where A is the atomic weight. We can extend these concepts even farther by formally sorting the observed baryon and meson resonances into nonadiabatic rotational bands. When we do this, we discover that the experimental moments of inertia of these hadron rotational bands, plotted as a function of the bandhead masses, extrapolate smoothly into the moments of inertia of the very light atomic nuclei. Applying the l (l + 1) energy interval rule to the observed /sup 1/D/sub 2/, /sup 3/F/sub 3/, and /sup 1/G/sub 4/ p-p resonances, and then extrapolating to l = 0 to obtain the mass of the unobserved p-p bandhead, we discover that it corresponds to a virtual pp..pi.. bound state, which is a characteristic hadronic excitation.

• Research Organization: Lawrence Livermore Laboratory, Livermore, California 94550
• OSTI ID: 5866842
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 20:7; ISSN PRVDA
• 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)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
BARYON RESONANCES
BARYON-BARYON INTERACTIONS
BARYONS
BOUND STATE
CROSS SECTIONS
DIBARYON RESONANCES
ELEMENTARY PARTICLES
ENERGY LEVELS
EXCITED STATES
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
HAMILTONIANS
INELASTIC SCATTERING
INTERACTIONS
ISOSPIN
MATHEMATICAL OPERATORS
MOMENT OF INERTIA
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PHASE SHIFT
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PROTONS
QUANTUM NUMBERS
QUANTUM OPERATORS
RESONANCE PARTICLES
RESONANCE SCATTERING
ROTATIONAL STATES
SCATTERING
TOTAL CROSS SECTIONS