/sup 10/B-induced 2n and 2p transfer reactions on light targets

Journal Article · Wed Feb 01 00:00:00 EST 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.17.586· OSTI ID:7207967

Hamm, M; Nagatani, K

A systematic study is made of 100 MeV /sup 10/B-induced 2n and 2p transfer reactions on light targets of /sup 12/C, /sup 14/N, and /sup 16/O. These reactions are seen to selectively populate only a few states in the residual nuclei, showing them to be useful for studying states of particular structures. Known states with (p/sub 1/2/d/sub 5/2/)/sub 3//sub -/ (d/2)/sup 2//sub 4//sub +/ structures are strongly populated in the T = 1 mass-14 nuclei. The known (d/sub 5/2/)/sup 2//sub 4//sub +/ states in the T = 1 mass-18 nuclei are also strongly populated. The lowest 2/sup +/ states (also of a d/sub 5/2//sup 2/ nature) in these latter nuclei are populated more weakly. Exact finite-range distorted-wave Born-approximation calculations, assuming a cluster transfer of the two neutrons or protons, are presented for the strongly populated levels in the mass-14 and -18 residual nuclei, and for the 2/sup +/ level in /sup 18/O. With the exception of this 2/sup +/ state and the unbound 4/sup +/ state in /sup 14/O, the shapes of the angular distributions are well fitted by the cluster approximation. The distorted-wave Born-approximation normalizations to the data are compared to cluster spectroscopic factors calculated from shell model wave functions for the various states involved. In most cases, the extracted factors agree with the calculated spectroscopic factors to within a factor of 3. This agreement suggests that the reaction mechanism is predominantly a one-step transfer of a T = 1, S = 0 pair of neutrons or protons. The known structures of the strongly populated states in the mass-14 and -18 nuclei can be used to interpret newly observed states in the mass-16 spectra, in which there are two groups of strongly populated levels in each nucleus. The doublet in the low excitation region corresponds to the known 2/sup -/ and 3/sup -/ states presumably populated through the transfer of the nucleon pair into a (p/sub 1/2/d/sub 5/2/)/sub 3//sub -/ configuration coupled to the /sup 14/N/sub 1//sub +/ target core.

• Research Organization: Cyclotron Institute, Texas A M University, College Station, Texas 77843
• OSTI ID: 7207967
• Journal Information: Phys. Rev., C; (United States), Vol. 17:2
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON 10 REACTIONS
TWO-NUCLEON TRANSFER REACTIONS
OXYGEN 16 TARGET
NITROGEN 14 TARGET
CARBON 12 TARGET
DIFFERENTIAL CROSS SECTIONS
DWBA
EXCITED STATES
MEV RANGE 10-100
SHELL MODELS
SPECTROSCOPIC FACTORS
WEAK-COUPLING MODEL
LITHIUM 8
NEON 18
FLUORINE 16
OXYGEN 14
BORON 8
CARBON 14
OXYGEN 18
NITROGEN 16
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORN APPROXIMATION
BORON ISOTOPES
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
FLUORINE ISOTOPES
HEAVY ION REACTIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MINUTES LIVING RADIOISOTOPES
MULTI-NUCLEON TRANSFER REACTIONS
NEON ISOTOPES
NITROGEN ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-ODD NUCLEI
OXYGEN ISOTOPES
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
TARGETS
TRANSFER REACTIONS
YEARS LIVING RADIOISOTOPES
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