Coulomb-nuclear interference in 56 MeV deuteron breakup at extreme forward angle

doi:10.1016/0370-2693(95)00515-M

Physics Letters B

Volume 352, Issues 3–4, 15 June 1995, Pages 197-200

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Abstract

Recently measured ¹²C(d,pn) ¹²C breakup data show a dip in the energy integrated cross section below a momentum transfer ∼ 117 MeV/c. We analyse these data by the prior form distorted-wave Born approximation theory. Although the double humped structure of the θ_p = θ_n = 0° data exhibit the dominance of Coulomb-breakup, the pronounced asymmetry of the energy sharing data cannot be explained through Coulomb breakup only. A closer agreement to the data is obtained through Coulomb-nuclear interference and an unusual optical potential of longer range in the exit channel.

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2001, Nuclear Physics A
Breakup of 42 MeV ⁷Li projectiles in the field of a ²⁰⁸Pb target are studied near the grazing angle. In inclusive breakup measurements, angular distribution of the $α$ and t fragments are found to be rather flat in nature. The $α$ –t coincidence measurements are carried out with wide angular separations between the detected fragments. The choice of detection angles enables measurement in the same range of fragment relative energies but very different ⁷Li^$∗$ scattering angles. The direct breakup contribution is found to dominate over the sequential breakup for the $θ_{α} >θ_{t}$ set, while the reverse is true when $θ_{α} <θ_{t}$ . Calculations performed in a full quantum mechanical framework reproduce the overall shape of the direct breakup part of the present data and several existing data on ¹⁹⁷Au and ²⁰⁸Pb targets at nearby energies. The sequential breakup is observed only from the decay of the 4.63 MeV ( $7/2^{−}$ ) resonant excited state of ⁷Li and its angular distribution does not fully agree with the existing theoretical predictions. Unlike the direct part, the sequential breakup cross section does not decrease with increasing scattering angles. Similar measurements with halo nuclei would be helpful to study their unknown resonant states.
Measurement of 42 MeV 7Li projectile breakup on 58Ni target beyond grazing incidence
1999, Nuclear Physics A
Angular distributions of the elastic and breakup cross sections of 42 MeV ⁷Li-projectile on ⁵⁸Ni target are measured at wide angles beyond the grazing angle. Coincidence measurements are done at unequal angle pairs. In this angular region, the direct breakup is found to be very small and strongly dominated by the nuclear breakup process, while the sequential breakup contributions from the decay of the $72^{−}$ , 4.63 MeV resonant state of ⁷Li remain significantly large within its corresponding sequential cone. Some indications of contributions from the higher sequential states ( $52^{−}$ 6.68 MeV, $52^{−}$ 7.46 MeV) are found.
Wide-angle measurement of 48 MeV 6Li projectile fragmentation on 197Au
1996, Nuclear Physics A
The ⁶Li → α + d projectile breakup at E(⁶Li) = 48 MeV with a ¹⁹⁷Au target is studied at large relative fragment energies. Both inclusive and exclusive measurements are carried out. The peaks corresponding to the protons and α-particles appear near the expected beam velocity positions while the deuterons and tritons are shifted to lower energy values. Calculations in the framework of both prior- and post-form distorted-wave Born approximation theories delineate an oscillatory structure for the exclusive cross section at larger α-d separation angles in consonance with the data profile. The oscillation is found to be a result of delicate Coulomb and nuclear interference. The distorted-wave analysis of the existing data at E(⁶Li) = 75 MeV, where the Coulomb effect is smaller, show a different feature altogether having no oscillation at larger angles. At larger angles, the factorisation theory for uncorrelated events seems to hold better at 75 MeV incident energy than at 48 MeV. The implications of these results are discussed.
Coulomb and nuclear dissociation of deuterons in a field of atomic nuclei
2006, Bulletin of the Russian Academy of Sciences: Physics
Deuteron breakup at extreme forward angles: Failure of a pure Coulomb dissociation description
1996, Physical Review C - Nuclear Physics

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Physics Letters B

Abstract

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Cited by (7)

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Measurement of 42 MeV <sup>7</sup>Li projectile breakup on <sup>58</sup>Ni target beyond grazing incidence

Wide-angle measurement of 48 MeV <sup>6</sup>Li projectile fragmentation on <sup>197</sup>Au

Coulomb and nuclear dissociation of deuterons in a field of atomic nuclei

Deuteron breakup at extreme forward angles: Failure of a pure Coulomb dissociation description