https://doi.org/10.1140/epja/i2011-11115-3
Regular Article - Experimental Physics
Investigation of γ-ray fold distributions in N ≤ 82 Gd, Eu and Sm nuclei: Observation of a double-humped fold distribution
1
iThemba Laboratory for Accelerator Based Sciences, P.O. Box 722, 7129, Somerset West, South Africa
2
Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany
3
A.F. Ioffe Physical Technical Institute RAS, RU-194021, St. Petersbourg, Russia
4
Institut für Naturwissenschaftlich-Technische Trendanalysen, Fraunhofer Gesellschaft e.V., D-53879, Euskirchen, Germany
5
Laboratori Nazionali di Legnaro, INFN, I-35020, Legnaro, Italy
6
Dipartimento di Fisica dell’Università, INFN, Sezione di Padova, I-35131, Padova, Italy
* e-mail: rainer_lieder@yahoo.com
Received:
26
May
2011
Revised:
29
July
2011
Accepted:
14
September
2011
Published online:
28
September
2011
Cross-sections and γ-ray fold distributions have been measured for the 97Mo+51V, 100Mo+48Ti and 114Cd+36S reactions at energies of 238, 215 and 182 MeV of the 51V, 48Ti and 36S projectiles, respectively. For the 97Mo(51V, α2n 142Eu reaction channel a double-humped fold distribution has been observed. This fold distribution can only be understand if an incomplete-fusion reaction mechanism associated with the α-particle emission is assumed. The 97Mo(51V, α n 143Eu reaction channel represents an incomplete-fusion reaction channel as well and its single-humped fold distribution can be described on the same footing as that of the α2n channel. The fold distributions associated with xn and pxn channels can be explained assuming complete-fusion reactions. For the calculations in terms of an incomplete-fusion reaction mechanism a narrow angular momentum window, ranging from ≈ 68 to 82ℏ has been assumed for the 97Mo(51V, αn and α2n reaction channels. The complete-fusion reaction mechanism is considered to be negligible in this angular-momentum range.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
