SCATTERING OF PROTONS FROM HELIUM AND LEVEL PARAMETERS IN Li$sup 5$

Journal Article · Mon Dec 15 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.112.2043· OSTI ID:4282639

Miller, P D; Phillips, G C

The scattering of protons from helium was investigated experimentally from 2.0 to 5.5 Mev with the Rice Institute Van de Graaff accelerator and a differentially pumped, large-volume scattering chamber. Excitation curves reveal no new states in Li/sup 5/ up to an excitation energy of 6.5 Mev. A phase-shift analysis was made of the angular distributions at laboratory bombarding energies of 3.03, 3.51, 4.02, 4.50, and 5.00 Mev. The phase shifts derived from this experiment and from experiments at other laboratories, in the energy range 1 to 18 Mev, have been interpreted in terms of the dispersion theory, and level parameters were extracted. The nuclear radius which best fits the P-wave phase shifts is 2.6 x 10/sup -13/ cm. For the ground state, (E/sub res/)lab = 2.6 Mev,J = 3/2/sup -/, gamma /sub 2/sup 2/ = 12 x 10/sup -13/ Mev-cm, and theta / sub p/sup 2/ = 0.40. For the first excited state, (E/sub res/)/sub lab/ = 10.8 Mev, J = 1/2/sup -/, gamma /sub p/sup 2/ = 30 x 10/sup -13/ Mev-cm, and theta / sub p//sup 2/ = 1.0. The S-wave phase shift is moderately well fit by a hard- sphere interaction with a radius of 2.0 x 10/sup -13/ cm. At the present time, the D-wave phase shiffs are so inaccurately known, that very little interpretation is possible. (auth)

• Research Organization: Rice Inst., Houston, Texas
• NSA Number: NSA-13-010467
• OSTI ID: 4282639
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 112; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

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PHYSICS AND MATHEMATICS