Structure phenomena in the orbiting 12c + 24Mg system

Binary reaction decays fromMg24+C12

“…The oscillations observed at large angles in the gate (a) region correspond to-as for the 24 Mg + 12 C exit-channel (not shown)-the oscillatory nature of the angular distribution of the α transfer, and they indicate the dominance of the grazing partial waves already observed for the 24 Mg + 12 C reaction [1,4,42,43] 16 O. The last two gates correspond to more and more energy damped collisions (deep-inelastic, orbiting [44] and fusion-fission [41]) with nonoscillatory angular distributions.…”

“…In a prior measurement at a lower bombarding energy, a selective population of natural-parity states was found to be favored in the 24 Mg + 12 C orbiting reaction [44], with a suppression of the 3 + 1 (5235 keV) and 5 + 1 (7812 keV) states of the K = 2 band of 24 Mg. In the present data, the 3 + state is strongly populated, whereas the 5 + state is moderately populated in sharp contrast with the previous experiment [44]. Decays from even higher energy 6 + 1 (8113 keV) and 6 + 2 (9528 keV) levels from the K π = 0 + and K π = 2 + bands, respectively, are also clearly visible in the spectrum.…”

“…The 24 Mg nucleus appears to be populated primarily through its first two rotational bands, K π = 0 + [2 + 1 (1369 keV), 4 + 1 (4123 keV), 6 + 1 (8113 keV)] and K π = 2 + [2 + 2 (4236 keV), 3 + 1 (5235 keV), 4 + 2 (6010 keV), 6 + 2 (9528 keV)], which are associated with stable prolate deformations, according to standard shell-model calculations [60]. In a prior measurement at a lower bombarding energy, a selective population of natural-parity states was found to be favored in the 24 Mg + 12 C orbiting reaction [44], with a suppression of the 3 + 1 (5235 keV) and 5 + 1 (7812 keV) states of the K = 2 band of 24 Mg. In the present data, the 3 + state is strongly populated, whereas the 5 + state is moderately populated in sharp contrast with the previous experiment [44].…”

“…The full details of the identified γ -ray transitions are given in Table I. effects, the α-like 12 C, 16 O, 20 Ne, 24 Mg, and 28 Si nuclei are preferentially populated compared to the odd Z nuclei. This strong odd-even effect is a characteristic behavior of structure phenomena in 12 C + 24 Mg orbiting [44] that may still survive at E lab = 130 MeV. The gas pressure has been optimized to stop ions with Z larger than 9 (ejectiles with lower Z's are not stopped in the BICs as shown by their characteristic endpoint/punch-through in Fig.…”

“…With the exception of the cluster decay of 60 Zn [32,33] and 56 Ni [34][35][36] recently studied using charged particle spectroscopy, no evidence for ternary breakup has yet been reported [13,[37][38][39][40][41] in light nuclei; the particle decay of 36 Ar SD bands (and other highly excited bands) is still unexplored. The main binary reaction channels of the 24 Mg + 12 C reaction, for which both quasimolecular structures [4,42,43] and orbiting phenomena [44] have been observed, is investigated in this work by using charged-particle-γ -ray coincidence techniques.…”