ANGULAR DISTRIBUTIONS AND CORRELATIONS FOR ALPHA-PARTICLE SCATTERING BY C$sup 12$, Mg$sup 24$, AND Ca$sup 4$$sup 0$

Journal Article · Wed Apr 01 00:00:00 EST 1959 · Physical Review (U.S.) Superseded in part by Phys.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.114.310· OSTI ID:4232034

Shook, G B

Angular distributions of alpha particles scattered from Mg/sup 24/ and Ca/sup 40/ are reported and effective interaction radii are obtained, based on the Born approximation for elastic scattering and direct-interaction theory for inelastic scattering. For Mg/sup 24/, levels at 0, 1.37, 4.2, and 6.3 Mev yield interaction radii of 6.4, 6.55, 6.5, and 6.5, respectively (units of 10/sup -13/ cm). Evidence is presented in support of the assignment of the 6.3-Mev level to 1Mg/sup24/ rather than to Mg/sup 25/ or Mg/sup 26/, with spin and parity 1-. For Ca/sup 40/, levels at 0 and 4.48 Mev yield interaction radii of 6.65 and 7.3, respectively. Alpha-gamma angular correlations, which correspond closely to those predicted on the basis of direct-interaction theory, were obtained for C/ sup 12/ (4.43-Mev level) and for Mg/sup 24/ (1.37-Mev level). For Ca/sup 40/ (4.48-Mev level) the correlation corresponds qualitatively to that predicted for a 1- level with cascde decay through an intermediate state to groud level. Further evidence is presented which supports this interpretation. A higher level in Ca/sup 40/ is observed at 8.4 Mev. All alpha bombardments were made at 43 Mev incident energy. (auth)

• Research Organization: Univ. of Washington, Seattle
• NSA Number: NSA-13-016488
• OSTI ID: 4232034
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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, Vol. Vol: 114; Other Information: Orig. Receipt Date: 31-DEC-59
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

PHYSICS AND MATHEMATICS
ALPHA PARTICLES
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
BORN APPROXIMATION
CALCIUM 40
CARBON 12
CROSS SECTIONS
DECAY
DIRECT REACTIONS
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
GAMMA RADIATION
INELASTIC SCATTERING
MAGNESIUM 24
MAGNESIUM 25
MAGNESIUM 26
MEASURED VALUES
NUCLEAR REACTIONS
PARITY
PERTURBATION THEORY
SCATTERING
SPIN