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| 2. |
- Assié, M., et al.
(författare)
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Neutron correlations in 6He viewed through nuclear break-up
- 2009
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Ingår i: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-6001 .- 1434-601X. ; 42:3, s. 441-446
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Tidskriftsartikel (refereegranskat)abstract
- The nuclear break-up of He-6 on a Pb-208 target was studied at 20 A MeV using a secondary beam of He-6 produced by the SPIRAL facility at GANIL. alpha-particles were detected in coincidence with two neutrons with a large angular coverage and the reaction mechanism was identified. From the distribution of the relative angles between the two neutrons the correlation function was extracted. It shows a strong correlation at small relative angles attributed to the contribution of the di-neutron configuration of He-6.
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| 3. |
- Assie, M., et al.
(författare)
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Neutron correlations in 6He viewed through nuclear break-up
- 2010
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Ingår i: Modern Physics Letters A. - 0217-7323 .- 1793-6632. ; 25:21-23, s. 1846-1849
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Tidskriftsartikel (refereegranskat)abstract
- Nuclear break-up as a tool to study neutron correlations is investigated both theoretically and experimentally. First a time dependent theory going beyond mean field has been developed and shows that correlations between nucleons can be probed through nuclear break-up. Secondly, nuclear break-up of He-6 on Pb-208 target was studied at 20 A.MeV using a secondary beam of He-6 produced by the SPIRAL facility at GANIL. From the correlation function, a strong contribution of the di-neutron configuration of He-6 is found.
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| 5. |
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| 6. |
- Chatterjee, A., et al.
(författare)
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1n and 2n transfer with the borromean nucleus He-6 near the Coulomb barrier
- 2008
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:3, s. 032701-
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Tidskriftsartikel (refereegranskat)abstract
- Angular distributions for In and 2n transfer are reported for the He-6 + Cu-65 system at E-lab = 22.6 MeV. For the first time, triple coincidences between a particles, neutrons, and characteristic gamma rays from the targetlike residues were used to separate the contributions arising from In and 2n transfer. The differential cross sections for these channels, elastic scattering, and fusion were analyzed using a coupled reaction channels approach. The large measured ratio of the 2n-to-1n cross section and the strong influence of 2n transfer on other channels indicate that the dineutron configuration of He-6 plays a dominant role in the reaction mechanism.
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| 7. |
- Lemasson, A., et al.
(författare)
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Pair and single neutron transfer with Borromean He-8
- 2011
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Ingår i: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 697:5, s. 454-458
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Tidskriftsartikel (refereegranskat)abstract
- Direct observation of the survival of Au-199 residues after 2n transfer in the He-8 + Au-197 system and the absence of the corresponding Cu-67 in the He-8 + Cu-65 system at various energies are reported. The measurements of the surprisingly large cross sections for Au-199, coupled with the integral cross sections for the various Au residues, is used to obtain the first model-independent lower limits on the ratio of 2n to in transfer cross sections from He-8 to a heavy target. A comparison of the transfer cross sections for He-6.8 on these targets highlights the differences in the interactions of these Borromean nuclei. These measurements for the most neutron-rich nuclei on different targets highlight the need to probe the reaction mechanism with various targets and represent an experimental advance towards understanding specific features of pairing in the dynamics of dilute nuclear systems.
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| 8. |
- Lemasson, A., et al.
(författare)
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Reactions with the double-Borromean nucleus 8He
- 2010
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 82:4, s. 044617-
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Tidskriftsartikel (refereegranskat)abstract
- Differential cross sections for elastic-scattering and neutron-transfer reactions along with cross sections for fusion in the He-8+Cu-65 system are reported at energies above the Coulomb barrier (E-lab = 19.9 and 30.6 MeV). The present work demonstrates the feasibility of using inclusive measurements of characteristic in-beam gamma rays with low-intensity (similar to 10(5) pps) radioactive ion beams to obtain the residue cross sections for fusion and neutron transfer. Exclusive measurements of gamma rays in coincidence with light charged particles have been used to further characterize the direct reactions induced by this double-Borromean nucleus. Coupled reaction channels calculations are used to illustrate the important role played by the transfer channels and to help in understanding the influence of the structure of He-8 on the reaction mechanism.
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