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Papka, P.; Álvarez-Rodríguez, R.; Nemulodi, F.; Bark, R. A.; Fox, S. P.; Gál, János; Ibrahim, T. T.; Kheswa, N. Y.; Lawrie, E. A.; Lawrie, J. J.; Lieder, E. O.; Lieder, R.M.; Madiba, T. E.; Molnár, J.; Mullins, S. M.; Newman, R. T.; Nyakó, B. M.; Shirinda, O.; Singo, T. D.; Tímár, J.

doi:10.1103/physrevc.81.054308

Cited by 12 publications

(10 citation statements)

References 35 publications

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“…[24,25] are inevitably needed in order to connect the branching ratio and the energy distribution to some specific structure. Such a combination analysis of the precise three-body calculation and the Monte Carlo simulation of the experiment has been applied in the studies of the three-body decay [26,27].…”

mentioning

confidence: 99%

Further Improvement of the Upper Limit on the Direct3αDecay from the Hoyle State inC12

et al. 2014

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The direct 3α decay branch from the 02+ state at Ex=7.65 MeV in 12C, which is known as the Hoyle state, is considered to affect the triple-α reaction rate strongly and to give crucial information on its structure. We have performed a high-precision measurement of the 3α decay from this state using the 12C(12C,3α)12C reaction at E12C=110 MeV. The branching ratio of the direct 3α decay was under the detection limit in the present experiment. By comparing with Monte Carlo simulations for three decay mechanisms as the sequential decay through the ground state of ^{8}Be, the direct decay with equal energies of three α particles, and the direct decay to the phase space uniformly, we have obtained the upper limit of 0.2% on the direct 3α decay.

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mentioning

confidence: 99%

Further Improvement of the Upper Limit on the Direct3αDecay from the Hoyle State inC12

et al. 2014

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“…This could be a part of the explanation for the strong deviation of the data of Ref. [5] from the other recent experimental studies [1,3,6].…”

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confidence: 58%

“…In the present work, we would like to focus on the most inter- esting theoretical results arising from our studies of this data [1]. This is a timely message considering the recent high interest in the 6 Be system [2][3][4][5][6]. We also think that these results should have an important impact on our understanding of three-body decays in general and aid in formulating experimental strategies for studies of this phenomenon.…”

mentioning

confidence: 86%

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Sensitivity of three-body decays to the reactions mechanism and the initial structure by example of6Be

Grigorenko

Егорова²,

Charity

et al. 2012

Phys. Rev. C

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The influence of the initial-state structure and the reaction mechanism on three-body decays is investigated using the example of the 6 Be continuum populated in neutron-knockout reactions on 7 Be. The sensitivity of the 6 Be excitation spectrum and the three-body correlations to the different components of the model is demonstrated. It is shown that the spin composition of the initial state may have an overwhelming effect on the three-body continuum. The characteristics and structure of the second 0 + 2 and 2 + 2 states in 6 Be are predicted and the conditions for their reliable observations are formulated. The effects of interference and the alignment of three-body states on the three-body correlations are demonstrated.Introduction. The study of systems beyond nuclear driplines is an important trend in modern low-energy nuclear research. Many of these systems belong to the three-body or even few-body continuum, and the reaction theory for populating these states is not well developed. Modern high-precision experiments with exotic beams require complicated analyses and advanced theoretical treatment, and call for deeper insights in this field.Observables in reactions producing unbound systems depend on three major ingredients: (i) the structure of initial nuclei, (ii) the reaction mechanism, and (iii) the final-state interaction (FSI). For very narrow resonances (extremely long-lived states), the aspects (i) and (ii) lose importance as the structure formed in the reaction has enough time to "forget" how it was created. Then for a consistent description of the system, it is sufficient to study only the decay process (FSI effects) by itself. However, exactly when this approach becomes valid is not always clear in advance. Clarity in this issue is especially important for systems beyond the driplines, where the resonant states (often already the ground states) are quite broad.In this work, we demonstrate the importance of the reaction mechanism and the initial-state structure for investigations of few-body systems beyond the driplines using the example of 6 Be (three-body α + p + p continuum) populated in neutronknockout reactions from 7 Be projectiles. The first result of these studies has been published in Ref.[1], elucidating the mechanism of democratic decay. Good agreement with experimental data was demonstrated for both the excitation spectrum and the three-body energy-angular correlations over a broad range of excitation energy. However, in this compact experimental work, many important theoretical issues of broader interest were left aside. In the present work, we focus on the most interesting theoretical results arising from our studies of the data [1]. This is a timely message considering the recent interest in the 6 Be system [2-6]. We also think that these

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“…The 6 Be is an unbound nucleus which has only two low-lying resonances, 0 + and 2 + . Its decay has been recently measured [11] and compared to theoretical predictions given by our formalism. We have not found any signatures of sequential decay of these resonances via intermediate two-body states.…”

Section: Bementioning

confidence: 96%

Three-particle decays of light-nuclei resonances

Álvarez-Rodríguez¹,

Jensen²,

Garrido³

et al. 2012

Phys. Scr.

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We have studied the three-particle decay of 12 C, 9 Be and 6 Be resonances. These nuclei have been described as three-body systems by means of the complex scaled hyperspherical adiabatic expansion method. The shortdistance part of the wave-function is responsible for the energies whereas the information related to the observable decay properties is contained at large distances, which must be computed accurately. As an illustration we show the results for the angular distribution of 9 Be and 6 Be resonances.

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Decay ofBe6populated in theLi6(

Cited by 12 publications

References 35 publications

Further Improvement of the Upper Limit on the Direct3αDecay from the Hoyle State inC12

Further Improvement of the Upper Limit on the Direct3αDecay from the Hoyle State inC12

Sensitivity of three-body decays to the reactions mechanism and the initial structure by example of6Be

Three-particle decays of light-nuclei resonances

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