D. Mahboub

Structure of Be-12: Intruder d-wave strength at N=8

The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.

B(E1) Strengths from Coulomb excitation of 11Be

The B(E1;1/2{sup +}{yields} 1/2{sup -}) strength for {sup 11}Be has been extracted from intermediate energy Coulomb excitation measurements, over a range of beam energies using a new reaction model, the extended continuum discretized coupled channels (XCDCC) method. In addition, a measurement of the excitation cross section for {sup 11}Be+{sup 208}Pb at 38.6 MeV/nucleon is reported. The B(E1) strength of 0.105(12) e{sup 2}fm{sup 2} derived from this measurement is consistent with those made previously at 60 and 64 MeV/nucleon, in contrast to an anomalously low result obtained at 43 MeV/nucleon. By coupling a multi-configuration description of the projectile structure with realistic reaction theory, the XCDCC model provides for the first time a fully quantum mechanical description of Coulomb excitation. The XCDCC calculations reveal that the excitation process involves significant contributions from nuclear, continuum, and higher-order effects. An analysis of the present and two earlier intermediate energy measurements yields a combined B(E1) strength of 0.105(7) e{sup 2}fm{sup 2}. This value is in good agreement with the value deduced independently from the lifetime of the 1/2{sup -} state in {sup 11}Be, and has a comparable precision.

Decay studies for states in {sup 9}Be up to 11 MeV: Insights into the n+{sup 8}Be and {alpha}+{sup 5}He cluster structure

An experiment was performed to study the

Decay path measurements for the 2.429 MeV state in {sup 9}Be: Implications for the astrophysical {alpha}+{alpha}+n reaction

^{9}mathrm{Be}

Experimental evidence for cluster structure of 11B excited states

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Experimental evidence of a v (1d5/2)2 component to the 12Be ground state

^{6}mathrm{Li}

Evidence Of A (1d52)2 Component To The 12Be Ground State

,

Decay studies for states in 9 Be up to 11 MeV: Insights into the n + 8 Be and α + 5 He cluster stucture

^{6}mathrm{Li}

α + Li and H + Be Decay of 10,11,12 B

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First excited 1/2(+) state in B-9

^{9}mathrm{Be}