Structure ofBe10from theC12(

H. G. Bohlen

¹

,

T. Dorsch

²

,

Tz. Kokalova

³

et al.

Abstract

The 12 C( 12 C, 14 O) two-proton pick-up reaction has been measured at 211.4 MeV incident energy to study the structure of states of 10 Be up to excitation energies of 12 MeV. The measured partial angular distributions show pronounced oscillatory shapes, which were described by coupled-reaction-channels calculations. Spin-parity assignments could be derived from these characteristic shapes and two definite assignments have been made. The state at 11.8 MeV has been identified as the 4 + member of the ground-state band, and the state at 10.55 MeV is assigned J π = 3 − . At 5.96 MeV only the 1 − 1 member of the known 2 + 2 /1 − 1 doublet is populated. The angular distribution of the peak at 9.50 MeV, which consists of several unresolved states, has been unfolded using contributions from known states at 9.56 MeV, 2 + , and 9.27 MeV, 4 − . The inclusion of a state at 9.4 MeV reported by Daito et al. from the 10 B(t, 3 He) 10 Be reaction and tentatively assigned (3 + ) improved the fit considerably. A K = 2 band is formed with the 2 + 2 state as the band head and the (3 + ) state as the second member. The structures of the K π = 0 + 1 , 2 + 2 , and 1 − 1 bands are discussed.

Elastic scattering, fusion, and breakup of light exotic nuclei

“…The low binding energy combined with the primarily S-wave relative orbital of the loosely bound neutron produce a one-neutron halo structure for this nucleus, with a compact 10 Be(0 + ) core (not inert). Actually, 11 Be is the only presently-known halo nucleus with a strongly deformed core [137]. It has one of the largest known reduced dipole transition probabilities between the first excited state at E x = 0.32 MeV and the ground state (B(E1) = 0.116(12) e 2 fm 2 [138]).…”

6He-triton cluster states in9Li

“…Many of low-lying states of Be isotopes are understood in a molecular orbital picture where a Be nucleus is considered to consist of 2 α's and valence neutron(s) in molecular orbitals around the 2α core [1][2][3][4][5][6][7][8][9][10][11][12][13]. In highly excited states near the He+He threshold energy of 10 Be and 12 Be, well-developed cluster states have been suggested experimentally and theoretically [7,[12][13][14][15][16][17][18][19][20]. Those developed cluster states show two-body cluster structures such as 6 He+ 4 He in 10 Be and 6 He+ 6 He in 12 Be.…”

Study of cluster structures in10Be and16C neutron-rich nuclei via break-up reactions

“…band is known, the subsequent members assignment is still missing. For example, the 4 + member, predicted at about 11-12 MeV, was initially claimed by Bohlen et al [3] and after contradicted by Suzuki et al in a very recent paper [4]. A negative parity rotational band with a 1 − state at 5.96 MeV as band-head is also reported in [1].…”