Exclusive breakup measurements for Be9

Fulton, B. R.; Cowin, R. L.; Woolliscroft, R. J.; Clarke, Nicholas; Donadille, L.; Freer, M.; Leask, P.J.; Singer, S. M.; Nicoli, M.P.; Benoit, B.; Hanappe, F.; Ninane, A.; Orr, N. A.; Tillier, J.; Stuttgé, L.

doi:10.1103/physrevc.70.047602

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…While a three body α + α + n cluster structure picture of the 9 Be nucleus is more accurate one, the effective two-body α + 5 He [α + (α + n)] [8,9] or n + 8 Be [n + (α + α)] [10,11] cluster configuration can be used successfully in the calculations to explain the reaction dynamics. Experimentally, several measurements of 9 Be breakup [12][13][14][15] have been performed to quantify the contribution of different cluster decay components in its low-lying excitation spectrum.…”

Section: Introductionmentioning

confidence: 99%

Exploring the breakup and transfer coupling effects in9Be elastic scattering

et al. 2013

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Section: Introductionmentioning

confidence: 99%

Exploring the breakup and transfer coupling effects in9Be elastic scattering

et al. 2013

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“…Decay rates were determined for the 2.429(5/2 − ) MeV resonance of 9 Be into three decay modes, 5 He + 4 He, 8 Be +n, and α + α + n, and a total breakup cross section was deduced. It was also found that the decay via the 5 He + 4 He configuration is the strongest one, in good agreement with beta decay and transfer measurements [23][24][25][26][27][28], but not with inelastic scattering studies on light targets [29][30][31]. No theoretical interpretation of these data was performed.…”

Section: Introductionmentioning

confidence: 79%

“…[51], the authors investigate breakup coupling effects on near-barrier 6 Li, 7 Be, and 8 B + 58 Ni elastic scattering in a CDCC approach. They observe the following paradox: 6 Li, with a relatively small breakup cross section, exhibits an important breakup coupling effect on the elastic scattering, whereas 8 B, with a large breakup cross section, shows a very modest coupling effect [31,51]. Further investigation found that the coupling effect on the modulus of the S matrix, which is connected with changes in the imaginary part of the potential, is almost negligible for 8 B and largest for 6 Li.…”

Section: Introductionmentioning

confidence: 99%

Global study of Be9 + p at 2.72A MeV

et al. 2020

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Background: In our recent experiment, 9 Be +p at 5.67A MeV, the breakup decay rates to the three configurations, α + α + n, 8 Be * +n and 5 He + 4 He of 9 Be, were observed and quantified in the proton recoil spectra, in a full kinematics approach. Unfolding step by step the accessibility to the above configurations, it will require similar experiments at lower or/and higher energies. It will also require the interpretation of the data in a theoretical framework. Three-body models for the structure of 9 Be have been developed and applied to reactions with heavy targets. Further research on lighter targets is required for the best establishment of the model. Such models are relevant for the calculation of the corresponding radiative capture reaction rate, α(α, γ ) 9 Be followed by 9 Be(α, n) 12 C. The last is essential for the r-process abundance predictions. Purpose: Investigate the breakup decay rate of 9 Be +p at 2.72A MeV, where the direct configuration α + α + n is mainly accessible. Compare and interpret data at this low energy and at the higher energy of 5.67A MeV into a four-body continuum discretized coupled-channel formalism. Point out and discuss couplings to continuum. Methods: Our experimental method includes an exclusive breakup measurement in a full kinematic approach of 9 Be incident on a proton target at 24.5 MeV (2.72A MeV). Complementary the elastic scattering is measured and other reaction channels are evaluated from previous measurements under the same experimental conditions. The interpretation of present data at 2.72A MeV and previous data at 5.67A MeV, are considered in a four-body continuum discretized coupled channel (CDCC) approach, using the transformed harmonic oscillator method for the three-body projectile. Results: An elastic scattering angular distribution at 2.72A MeV is measured, which compares very well with CDCC calculations, indicating a strong coupling to continuum. At the same energy, the breakup and total reaction cross sections are measured as σ break = 2.5 ± 1m ba n dσ tot = 510 ± L90 mb, in good agreement with the calculated values of 3.7 and 433 mb, respectively. Further on, into the same theoretical framework, the elastic scattering and breakup cross section data at 5.67A MeV are found in very good agreement with the CDCC calculations. Conclusions: It was confirmed in a global experimental framework that four-body CDCC calculations can describe very well the data even at low energies. Coupling to continuum is very strong despite the small measured breakup cross section. Moreover, the present results support further our three-body model for the structure of 9 Be, validating relevant radiative reaction rates obtained previously.

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“…The 8 Be production channel is not the only possible one which involves the two He fragment production. In particular, in [6] one discusses the possibility of observing a channel 9 Be→ 5 He+α →2α+n.…”

Section: Resultsmentioning

confidence: 99%

Features of the 9Be → 2He fragmentation in an emulsion for an energy of 1.2 GeV per nucleon

et al. 2007

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The results of investigations of the relativistic 9 Be nucleus fragmentation in emulsion which entails the production of two He fragments of an energy of 1.2 A GeV are presented. The results of the angular measurements of the 9 Be→2He events are analyzed. The 9 Be→ 8 Be+n fragmentation channel involving the 8 Be decay from the ground (0 + ) and the first excited (2 + ) states to two α particles is observed to be predominant.

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Exclusive breakup measurements for Be9

Cited by 22 publications

References 11 publications

Exploring the breakup and transfer coupling effects in9Be elastic scattering

Exploring the breakup and transfer coupling effects in9Be elastic scattering

Global study of Be9 + p at 2.72A MeV

Features of the 9Be → 2He fragmentation in an emulsion for an energy of 1.2 GeV per nucleon

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