Investigation of the nucleus-nucleus interaction at small distances in elastic scattering of 6li and the reaction (6Li, 6He) on carbon isotopes

doi:10.1016/0375-9474(89)90297-2

Nuclear Physics A

Volume 501, Issue 2, 18 September 1989, Pages 336-366

https://doi.org/10.1016/0375-9474(89)90297-2 Get rights and content

Abstract

The cross sections of elastic scattering of ⁶Li and of the charge-exchange reaction (⁶Li, ⁶He) on the nuclei ¹³C and ¹⁴C were measured at the projectile energy 93 MeV. A theoretical analysis of the reaction was carried out using microscopic DWBA with central and tensor components of the nucleon-nucleon forces and the decomposition of the reaction amplitude to near side and far side components. The far components were seen to dominate both the elastic scattering and the reaction for the angles above 30°, and a small shoulder in the differential cross section curves around 90° in elastic scattering and in ¹⁴C(⁶Li, ⁶He) ¹⁴N(3.95) may be interpreted as a rudimentary nuclear rainbow. The analysis of the scattering data lead to a new family of potentials for the systems ⁶Li + ^12,13,14C. The reproduction of the differential cross sections for population of the 1⁺ states in the charge-exchange reaction at large angles called for a change of the form factors, compared to the theoretical ones, for radii which were considerably smaller than the strong absorption radius. It is possible that to reproduce the (⁶Li, ⁶He) reaction data, a 20% difference between the imaginary potentials of ⁶He and ⁶Li is needed.

References (35)

K.W. Ford et al.
Ann. or Phys.
(1959)
K.W. McVoy et al.
Nucl. Phys.
(1984)
J. Cook et al.
Nucl. Phys.
(1982)
D.V. Aleksandrov et al.
Nucl. Phys.
(1985)
A.S. Dem'yanova et al.
Pribory i Tekhnika Eksp.
(1985)
V.I. Kukulin et al.
Nucl. Phys.
(1986)
W.M. Vissher et al.
Phys. Rev.
(1957)
M.F. Vineyard et al.
Phys. Rev.
(1984)
I. Tanihata et al.
Phys. Lett.
(1985)
A.S. Dem'yanova et al.
Inst. of Phys., Univ. of Bergen, Rep. No. 192
(1987)

Y. Sakuragi et al.

Prog. Theor. Phys. Suppl. No. 89

(1986)

K.R. Greider

D.A. Goldberg et al.

Phys. Rev. Lett.

(1972)

A.S. Dem'yanova

IAE-4139/2

(1985)

R. Pesl et al.

Z. Phys.

(1983)

Yu.A. Glukhov et al.

Yad. Fiz.

(1981)

Yu.A. Berezhnoi et al.

Dan USSR

(1984)

Cited by (14)

Elastic scattering analysis of isobar nuclei A = 6 projectiles on 12C using different models of optical potential
2021, Nuclear Physics A
In this research, we have extracted a new systematic global description for the fifteen data sets of the ⁶Li+¹²C elastic scattering angular distribution in the energy range of 5.8–600 MeV, and for the seven data sets of the ⁶He+¹²C elastic scattering in the energy range of 5.9–493.8 MeV using the simple optical model OM potential with fixed radii parameters. We have reanalyzed the two nuclear systems using a microscopic method within the framework of the double folding São Paulo potential (SPP) and the double folding cluster model (renormalized DFC1 and non-renormalized DFC2), prompted by the cluster structure of both (⁶He and ⁶Li) nuclei. We have adding the dynamic polarization potential (DPP) to DFC2, for well reproducing the experimental data, because the elastic scattering of weakly bound nuclei (⁶He and ⁶Li) is strongly affected by the coupling to other reaction channels, such as break-up. We have studied the effect of hallo properties of ⁶He by comparing the reflexion coefficients derivatives and the reduced cross sections (according to different prescriptions) of the two projectiles. The energy dependence for the reaction cross sections $σ_{R}$ , real and imaginary volume integrals of the considered reactions and comparing it to the previously reported ones have been investigated. The dispersion relation between real and imaginary parts of optical potential has been investigated for both studied systems.
Mechanisms of charge-exchange in the 12C(7Li, 7Be)12B reaction at the beam energy of 82 MeV
2006, Nuclear Physics A
Angular distributions for the transitions to the ground and excited states of ¹²B from the ¹²C(⁷Li, ⁷Be)¹²B reaction at 82 MeV were measured. The data were analyzed in the framework of distorted wave born approximation for the direct charge-exchange and coupled reaction channels method for the two-step sequential nucleon transfers. It was shown that the two-step sequential nucleon transfer is the dominant mechanism in the investigated angular range and the direct mechanism becomes important only for small angles ( $θ_{cm} < 10 °$ ).
Energy levels of light nuclei A = 5, 6, 7
2002, Nuclear Physics A
Direct charge-exchange versus sequential nucleon transfers in the 14C(6Li,6He)14N reaction at 93 MeV
1998, Nuclear Physics A
The ¹⁴C(⁶Li,⁶He)¹⁴N reaction was investigated at a ⁶Li ion energy of 93 MeV. The angular distributions for several natural and unnatural parity states of the ¹⁴N nucleus were compared with the DWBA and Coupled Reaction Channels (CRC) calculations assuming direct charge exchange and two-step sequential nucleon transfers. It was shown that the direct charge-exchange mechanism dominates for the transitions to the ground and excited (E_x = 3.95 MeV) 1⁴ states of the ¹⁴N nucleus up to angles of 50°–70°. The sequential nucleon transfers must be taken into account at larger angles for these states and in the full angular range for the other states (2.31 MeV (0⁺, T = 1), 5.11 MeV (2⁻), 5.69 MeV (1⁻) + 5.83 MeV (3⁻), 7.03 MeV (2⁺) and 8.49 MeV (4⁻)).
Optical potential for the elastic scattering of 6Li projectile on 1 p-shell nuclei
2022, International Journal of Modern Physics E
Investigation the elastic scattering of isobar nuclei 6Li and 6He by 12C using different nuclear potentials
2022, International Journal of Modern Physics E

View all citing articles on Scopus

View full text

Article preview

Nuclear Physics A

Abstract

References (35)

Ann. or Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Pribory i Tekhnika Eksp.

Nucl. Phys.

Phys. Rev.

Phys. Rev.

Phys. Lett.

Inst. of Phys., Univ. of Bergen, Rep. No. 192

Prog. Theor. Phys. Suppl. No. 89

Phys. Rev. Lett.

IAE-4139/2

Z. Phys.

Yad. Fiz.

Dan USSR

Cited by (14)

Elastic scattering analysis of isobar nuclei A = 6 projectiles on <sup>12</sup>C using different models of optical potential

Mechanisms of charge-exchange in the <sup>12</sup>C(<sup>7</sup>Li, <sup>7</sup>Be)<sup>12</sup>B reaction at the beam energy of 82 MeV

Energy levels of light nuclei A = 5, 6, 7

Direct charge-exchange versus sequential nucleon transfers in the <sup>14</sup>C(<sup>6</sup>Li,<sup>6</sup>He)<sup>14</sup>N reaction at 93 MeV

Optical potential for the elastic scattering of <sup>6</sup>Li projectile on 1 p-shell nuclei

Investigation the elastic scattering of isobar nuclei 6Li and 6He by 12C using different nuclear potentials