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ABSTRACT: Angular distributions of the α-particle production differential cross section from the breakup of 6Li and 7Li projectiles incident on a 208Pb target have been measured at seven projectile energies between 29 and 52 MeV. The α-breakup cross section of 6Li was found to be systematically greater than that of 7Li across the entire energy range. These data have been compared with previously reported results and with the predictions of continuum-discretized coupled channels (CDCC) calculations including resonant and nonresonant projectile breakup. The present data compare well with previous measurements, while the CDCC calculations provide a reasonable prediction of the relative α-breakup cross sections but underpredict their absolute values. The calculations confirm that a major factor in the enhancement of the 6Li to 7Li α-breakup cross section is the difference between the α-breakup thresholds of the two isotopes. These results have implications for structural studies of light exotic nuclei based on elastic scattering.
Phys. Rev. C. 12/2000; 63(2).
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M Freer,
N M Clarke,
B R Fulton,
S J Hoad, G R Kelly,
R A Le Marechal,
R P Ward,
C D Jones,
P Lee,
W N Catford,
G J Gyapong
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ABSTRACT: Measurements of the energy dependence of the reactions , and have been performed at beam energies ranging from 51 to 66 MeV. Silicon strip detectors were used to detect the decays of nuclei excited to the , 7.65 MeV and , 9.64 MeV excited states. Correlated, broad structures have been observed in the reactions at = 27.5 and 32.0 MeV, with associated angular momenta of L = 18 and 20 respectively. Similar structures have also been observed in the reactions at and 26.5 MeV, with associated angular momenta of L = 12 and 13.
Journal of Physics G Nuclear and Particle Physics 12/1998; 22(7):1053. · 4.18 Impact Factor
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R. A. Le Marechal,
N. M. Clarke,
M. Freer,
B. R. Fulton,
S. J. Hall,
S. J. Hoad, G. R. Kelly,
R. P. Ward,
C. D. Jones,
P. Lee,
D. L. Watson
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ABSTRACT: A fine-step excitation function has been measured across the resonance
reported at 32.5 MeV in the
12C[12C,12C(0+2)]12C(0+2)
reaction. Correlated structure is also observed in other exit channels
involving the 0+2 and 3-1
states of 12C and in the 16O+8Be
channel.
Physical Review C 03/1997; 55:1881-1889. · 3.31 Impact Factor
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G.J. Gyapong,
N. Curtis,
W.N. Catford,
S.M. Singer,
W.D.M. Rae,
M. Freer,
S.J. Hall, G.R. Kelly,
R.A. Le Marechal,
R.P. Ward,
S.P.G. Chappell,
S.P. Fox,
C.D. Jones,
P.R. Lee,
D.L. Watson
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ABSTRACT: A study has been made of the 12C(16O,12C12C) α reaction between the centre of mass energies of 28.3 to 36.8 MeV. A number of resonances in 28Si have been observed for final channels leading to the unbound 10.35, 11.09 and 14.82 MeV states in 16O. At two energies associated with previously observed resonances, the angular correlations of the exit channel particles have been analysed to measure the dominant angular momentum of the 28Si compound nucleus. Additional data were acquired at two off-resonance energies for comparison. Using an essentially model independent analysis, the values obtained were all in the region of 19–21 , and are comparable with the grazing angular momentum in the entrance channel. The results are relevant to recent theoretical predictions of planar α-cluster structures in 28Si and are discussed in the context of the model predictions.
Nuclear Physics A.
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ABSTRACT: Measurements of the 12C(16O,20Neα)α, 12C(16O,αα)20Ne, 12C(16O,8Be)20Ne and 12C(16O,16Oα)8Be reactions have been performed at Ec.m. = 27.0 MeV. For decays proceeding through resonant states in the intermediate 24Mg nucleus, angular correlation measurements have enabled spin assignments to be made and the dominant entrance channel angular momentum to be determined. The results are inconsistent with recent similar experiments which were interpreted as arising from successive α-decays from deformed shape isomeric states in 28Si and 24Mg.
Nuclear Physics A.
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ABSTRACT: The 12C(16O,12C 12C)α reaction has been measured at Ebeam=75 MeV, for 24Mg emission from 0 to 180 degrees. This energy coincides with an enhancement observed in earlier measurements of the 12C+16O system. The properties of the angular correlations of the reaction products are found to be consistent with a resonance in 28Si at Ex=48.9 MeV, with spin J=17±1. The decay properties of the states in 24Mg, populated following α-decay of the resonance, suggest that the state in 28Si possesses a triaxial structure linked to a (sd)8(fp)4 configuration.
Nuclear Physics A. 694:147-156.
