Delta. degrees of freedom in trinuclei. III. The Argonne. Delta. model

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.45.2045· OSTI ID:7044072

Picklesimer, A ^[1]; Rice, R A ^[2]; Brandenburg, R ^[3]

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1. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)
3. Physics Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Institute of Physics, University of Basel, 3056 Basel (Switzerland)

The Argonne {Delta} model is used to study the effect of one-{Delta} and {Delta}{Delta} degrees of freedom on the triton binding energy ({ital E}{sub {ital T}}). Exploratory calculations decompose the {ital J}{le}4 system of interest into restricted ({ital JL}2) calculations, with {ital J}{le}2 and {ital L}({ital N}{Delta}), {ital L}({Delta}{Delta}){le}2, and a 130 keV attractive correction. A {ital JL}2 dispersive calculation yields {ital E}{sub {ital T}}=6.50 MeV, while a full {ital JL}2 calculation gives 7.16 MeV, revealing an attractive {Delta} three-body-force (3BF) contribution of 660 keV. Comparing to the nucleons-only value, {ital E}{sub {ital T}}=7.58 MeV, the size of the repulsive {Delta} dispersive effect is 1080 keV. The one-{Delta} and {Delta}{Delta} 3BF contributions are found to be 440 and 220 keV, respectively, while the corresponding full {ital J}{le}4 values are 450 and 290 keV, respectively. The net {ital J}{le}4 result is {ital E}{sub {ital T}}=7.29 MeV versus a nucleons-only value of 7.67 MeV: the attractive {Delta} 3BF contribution is not quite sufficient to cancel the 1120 keV repulsive {Delta} dispersive effect. The cancellation between dispersive and 3BF effects is similar to that found for the Hannover {Delta} model, although the residual {Delta} repulsive effect found for the Argonne model is non-negligible: {Delta} effects are found {ital not} to resolve the triton binding energy defect. It is also evident from these results that {Delta} dispersive effects are {ital not} adequately represented in nucleons-only models simply by force of fitting the {ital NN} data. Thus, the present results confirm the qualitative implications of our previous studies using the Hannover {Delta} model, including the fact that {Delta}{Delta} effects are appreciable.

• OSTI ID: 7044072
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 45:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

663110* -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663510 -- Nuclear Mass Ranges-- A=1-5-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON-BARYON INTERACTIONS
BARYONS
BINDING ENERGY
CHARGED PARTICLES
DELTA BARYONS
DELTA-1232 BARYONS
ELEMENTARY PARTICLES
ENERGY
FERMIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
MANY-BODY PROBLEM
N BARYONS
NUCLEAR FORCES
NUCLEON-NUCLEON INTERACTIONS
PARTICLE INTERACTIONS
POTENTIALS
THREE-BODY PROBLEM
TRITONS