Direct versus exchange processes in the reactions 7Li( 14N, 14,15N) at 110 MeV

• Published in: Nuclear physics. A Vol. 700; no. 1; pp. 25 - 41
• Main Authors: Rudchik, A.T., Pirnak, Val.M., Budzanowski, A., Szczurek, A., Chernievsky, V.K., Głowacka, L., Kliczewski, S., Koshchy, E.I., Mokhnach, A.V., Siudak, R., Skwirczyńska, I., Turkiewicz, J., Ziman, V.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-03-2002
• Subjects: 14N; 7Li; 7Li( 14N, 14N); 7Li( 14N, 15N); [formula omitted] MeV; coupled reaction channels method analysis; deduced deformation parameters; Deduced reaction mechanism features; Measured σ( θ); Nuclear reactions; Optical model; coupled reaction channels method analysis; Measured σ( θ); deduced deformation parameters; Optical model; E lab ( 14 N)=110 MeV; 24.10.Eq; Deduced reaction mechanism features; 14N; 7Li( 14N, 15N); 7Li( 14N, 14N); 7Li; 25.45.Hi; 24.50.+g; Nuclear reactions
• ISSN: 0375-9474
• DOI: 10.1016/S0375-9474(01)01319-7

The angular distributions of elastic and inelastic scattering of the
14N ions by the
7Li nuclei were measured for the transitions to the ground and 3.948 MeV (1
+), 4.915 MeV (0
−)+5.106 MeV (2
−), 6.204 MeV (1
+)+6.444 MeV (3
+), 7.967 MeV (2
−) excited states of the nucleus
14N and to the ground and 4.63 MeV (7/2
−), 6.68 MeV (5/2
−), 7.467 MeV (5/2
−) excited states of the nucleus
7Li at
E
lab
(
14
N)=110
 MeV. The angular distribution of the reaction
7Li(
14N,
15N)
6Li was obtained simultaneously at the same energy. The experimental data were analyzed within coupled reaction channels (CRC) method. The elastic and inelastic scattering as well as transfers of clusters were included in the coupling scheme. We have concentrated on the study of the reaction mechanism at backward angles where anomalous large-angle scattering (ALAS) is observed. Unlike in many other reactions, the reorientation of
7Li was found to be by far the most dominant mechanism in this region. The deformation parameters for the nuclei of
7Li and
14N were obtained by fitting the experimental data for both elastic and inelastic scattering. The deformation parameters of
7Li obtained from the analysis of elastic and inelastic channels coincide. Good agreement between measured and calculated cross sections was achieved.