Nuclear structure of /sup 26/Al studied by two-nucleon transfer reactions /sup 28/Si(d,. cap alpha. ) and /sup 24/Mg(/sup 3/He,p)

Journal Article · Wed Apr 01 04:00:00 EST 1981 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.23.1305· OSTI ID:6522301

Takahashi, N; Hashimoto, Y; Iwasaki, Y; Sakurai, K; Soga, F; Sagara, K; Yano, Y; Sekiguchi, M

The differential cross sections for the reactions /sup 28/Si(d,..cap alpha..)/sup 26/Al and /sup 24/Mg(/sup 3/He,p)/sup 26/Al were measured at the incident energies of 33.0 and 27.5 MeV, respectively, in order to investigate the structure of /sup 26/Al in connection with the nuclei /sup 28/Si and /sup 24/Mg. The angular distributions and the relative magnitudes of the cross sections were analyzed by using the distorted-wave Born approximation theory of the two-nucleon transfer reactions. The shapes of the calculated angular distributions reproduced well the experimental data. The transferred angular momenta L extracted from the angular distributions were consistent with the spins and parities already known. A qualitative picture of the structure of the nucleus /sup 26/Al from the data of the relative transition strengths of the two-nucleon transfer reactions was attempted using two simple models of nuclear structure, the Nilsson model with pairing correlations and the simple pairing model of a spherical nucleus. In the former the final state was described by a single configuration of two Nilsson quasiparticles and in the latter, by a single configuration of two quasiparticles in a spherical basis. This Nilsson model showed that the two-nucleon transfer strengths for the low-lying states of /sup 26/Al supported the idea that there exist states with opposite signs of the deformation parameter in the low-lying states of /sup 26/Al. The simple pairing model predicted well the overall features of the two-nucleon transfer strengths. This success evolved from the assumption that the final states of /sup 26/Al were described separately for stripping to /sup 24/Mg and pickup from /sup 28/Si by using realistic values of the occupation number probabilities for the shell model orbitals of the respective nuclei. These facts suggest also the existence of states with different character in the /sup 26/Al nucleus.

• Research Organization: Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan
• OSTI ID: 6522301
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 23:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ALUMINIUM 26
ALUMINIUM ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORN APPROXIMATION
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DEUTERON REACTIONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
DWBA
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
HADRONS
HELIUM 3 REACTIONS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 24 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MULTI-NUCLEON TRANSFER REACTIONS
NILSSON-MOTTELSON MODEL
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
PICKUP REACTIONS
PROTONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON 28 TARGET
SPIN
STRIPPING
TARGETS
TRANSFER REACTIONS
TWO-NUCLEON TRANSFER REACTIONS
YEARS LIVING RADIOISOTOPES