SUMMARY OF PROGRESS REPORT ON NUCLEAR PHYSICS , DURING YEARLY PERIOD ENDING IN FEBRUARY 1963

Technical Report · Thu Oct 31 00:00:00 EST 1963

OSTI ID:4721926

Aspects of nucleon-nucleon interactions are being examined. Tests of the mathematical form of the one-pion exchange interaction and of the validity of charge independence were improved. No real negation of the applicability of either the mathematical form of the one-pion exchange potential or of charge independence has been found. Work on p-p and p-n scattering analysis centered on improving the accuracy of data and on rewriting IBM 704 programs for the IBM 709 and 7090. The new programs provide separate treatments of errors in quantities such as differential cross sections and in relative values at the same incident energy. Improvements in the least squares method of adjustment to data were also made. Difficulties in correcting for the effects of nuclear magnetic moments were examined, and formulas and numbers giving the corrections applicable to the one-pion exchange group were worked out and incorporated in new machine programs. A partial analysis of data for n-p scattering in the 2 to 3 Bev energy region shows the existence of a sharp peak in the angular distribution of recoil protons from elastic collisions. Interpretation of work on the interplay of multipion resonance effects with each other and with the direct pion interaction was begun. Systematization of spin rotation effect and aspects of relativistic effects in the Coulomb interaction in p-p scattering was carried out. Treatment of N-N spin- orbit and central field interactions caused by vector meson exchange was improved. Programming of the IBM 709 for computation of the first order nucleonnucleus optical potential and nucleon-nucleus observables in first Born approximation at forward angles from N-N phase parameters was performed. An IBM 709 program for computing pi -N scattering observables from phase shifts was also written. Investigation of photodisintegration of deuterons involved correcting the formulas used in calculating higher order magnetic multipole effects for some omitted effects and rewriting the 704 programs for the IBM 709. Progress in a scattering matrix approach to deuteron photodisintegration was also made. In theory of nucleon-transfer reactions, systematization of the connection between completely quantum mechanical and semiclassical treatments, including analysis of approximations required in the former to obtain the latter, was attempted. Presence of interference effects between the waves was partially confirmed by experiment. Calculations of third order effects in Coulomb excitation were carried out, and programming for more extensive work was begun. Work on interpretation of heavy ion elastic scattering involved additional calculations of the interaction using nucleonnucleus scattering with some calculations using an ingoing wave boundary condition instead of an optical model treatment of the nuclear interior. Twenty-one papers published or submitted for publication during the period are listed. (D.C.W.)

• Research Organization: Yale Univ., New Haven
• DOE Contract Number: AT(30-1)-1807
• NSA Number: NSA-17-017123
• OSTI ID: 4721926
• Report Number(s): TID-18127
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

PHYSICS
BORN APPROXIMATION
COMPUTERS
COULOMB EXCITATION
CROSS SECTIONS
DECAY
DEUTERONS
ELECTRIC CHARGES
ELECTRIC POTENTIAL
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
ERRORS
EXCITATION
IBM 704
IBM 709
IBM 7090
INTERACTIONS
MAGNETIC MOMENTS
MAGNETISM
MATHEMATICS
MATRICES
MESONS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEONS
OPTICAL MODEL
ORBITS
PERTURBATION THEORY
PHASE SHIFT
PHOTOPRODUCTION
PIONS
PROGRAMMING
PROTONS
QUANTUM MECHANICS
RECOILS
RELATIVITY THEORY
RESONANCE
SCATTERING
SPIN
VECTORS