In:
Frontiers in Physics, Frontiers Media SA, Vol. 10 ( 2022-10-20)
Abstract:
An experimental study of the helium-cluster decays of the 12 Be excited states has been performed using the 9 Li + 7 Li → α + α + 8 He and 9 Li + 7 Li → α + 6 He + 6 He reactions at the 9 Li beam energy of 74.8 MeV. At excitation energies between 10 and 25 MeV, the 12 Be excited states decaying into the 4 He + 8 He, 6 He + 6 He, and 6 He + 6 He*(1.8 MeV, J π = 2 + ) have been observed. Most of the observed states decaying into the 4 He + 8 He and 6 He + 6 He correspond to previously reported states. The decay to the 6 He + 6 He*(1.8 MeV, J π = 2 + ) channel has been observed for the first time. Two of the five states observed in this new decay channel are also observed in the ground state channel 6 He + 6 He, while two may correspond to the 4 He + 8 He decaying states. The states around 13.5 and 20.0 MeV decay to the 6 He + 6 He and 4 He + 8 He channels, while the state around 22.3 MeV decays into all three decay channels examined. This experiment is complementary to all previous studies of the 12 Be cluster states because of the different reaction mechanisms used for the population of the 12 Be cluster states. The observation of the states at high excitations with these exotic decay properties strongly supports the molecular structure of the 12 Be excited states.
Type of Medium:
Online Resource
ISSN:
2296-424X
DOI:
10.3389/fphy.2022.1009421
Language:
Unknown
Publisher:
Frontiers Media SA
Publication Date:
2022
detail.hit.zdb_id:
2721033-9
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