States at high excitation inC12from theC12(

Abstract

The high excitation energy region, E x >15 MeV, of 12 C was probed using the 12 C( 3 He, 3 He)3α reaction. The 3 He nucleus was detected using a particle identification telescope and was used to reconstruct the excitation energy of 12 C. The 3α decay of 12 C was observed via the detection of two of the three final-state α particles in an array of two double-sided silicon strip detectors. The present analysis selected decays via 8 Be gs + α. Evidence is found for a series of states at 16.3(0.

States of Carbon-12 in the Skyrme Model

“…The D 3h symmetry was fairly clear from the experimentally observed states up to spin 4, after the existence of the 4 − state was clarified [15,16], and has been further confirmed by the recent observation of the 5 − state [17]. Higher energy states of Carbon-12 with isospin 0 have been seen, but none are yet established as having spin 6 [13]. In Fig.…”

“…The quantized D 3h -symmetric Skyrmion models the 0 + ground state of Carbon-12 and its rotational excitations. The quantized D 4h -symmetric Skyrmion is identified with the 0 + Hoyle state and its rotational excitations [12,13,14]. We discuss below whether this identification is reasonable.…”

States of Carbon-12 in the Skyrme Model

“…The D 3h symmetry was fairly clear from the experimentally observed states up to spin 4, after the existence of the 4 − state was clarified [15,16], and has been further confirmed by the recent observation of the 5 − state [17]. Higher energy states of Carbon-12 with isospin 0 have been seen, but none are yet established as having spin 6 [13]. In Fig.…”

“…The quantized D 3h -symmetric Skyrmion models the 0 + ground state of Carbon-12 and its rotational excitations. The quantized D 4h -symmetric Skyrmion is identified with the 0 + Hoyle state and its rotational excitations [12,13,14]. We discuss below whether this identification is reasonable.…”

The Birmingham MC40 Cyclotron Facility

“…1) finally entered operation in 1948. It was a fixed frequency (10.5 MHz) machine delivering beams of 10 MeV protons, 20 MeV deuterons, 30 MeV 3 He and 40 MeV 4 He. Beams of beryllium, carbon, nitrogen, oxygen and neon were also demonstrated.…”