Soft dipole mode in 8He

Grigorenko, L. V.; Golovkov, M. S.; Ter‐Akopian, G. M.; Фомичев, А. С.; Oganessian, Yu. Ts.; Gorshkov, V. A.; Krupko, S. A.; Родин, А. М.; Sidorchuk, S. I.; Slepnev, R. S.; Stepantsov, S. V.; Wolski, R.; Pang, Dan; Chudoba, V.; Korsheninnikov, A. A.; Kuzmin, E. A.; Nikolskii, E. Yu.; Novatskiǐ, B. G.; Stepanov, D. N.; Roussel‐Chomaz, P.; Mittig, W.; Ninane, A.; Hanappe, F.; Stuttgé, L.; Yukhimchuk, A. A.; Perevozchikov, V. V.; Vinogradov, Yu. I.; Гришечкин, С. К.; Zlatoustovskiy, S. V.

doi:10.1134/s1547477109020046

Cited by 11 publications

(14 citation statements)

References 24 publications

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“…5 were studied in detail in Refs. [ 7,8], where the experimental data were well reproduced by theoretical calculations. Our experimental data for the 0 + state also yield full agreement with the model calculations and thus with the data of Ref.…”

Section: Data Analysis: Correlations In 6 Besupporting

confidence: 53%

“…The method, which was successfully applied in Ref. [ 7] to the studies of the 0 + state, was used for the resonant 0 + and 2 + states. The calculated cross section profiles are shown in Fig.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…The correlation patterns observed for the decay of 6 Be led to the concept of democratic decay [ 5] which is now generally accepted. In heavier 2p-unstable nuclei the true 2p emission occurs in the form of two proton radioactivity [ 6], as discussed by comparing the correlation data of 6 Be and 45 Fe [ 7].…”

Section: Introductionmentioning

confidence: 99%

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Isovector soft dipole mode in 6Be

et al. 2012

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By using the 1H(6Li,6Be)n charge-exchange reaction, continuum states in 6Be were populated up to E_t=16 MeV, E_t being the 6Be energy above its three-body decay threshold. In kinematically complete measurements performed by detecting alpha+p+p coincidences, an E_t spectrum of high statistics was obtained, containing approximately ~5x10^6 events. The spectrum provides detailed correlation information about the well-known 0^+ ground state of 6Be at E_t=1.37 MeV and its 2^+ state at E_t=3.05 MeV. Moreover, a broad structure extending from 4 to 16 MeV was observed. It contains negative parity states populated by Delta L=1 angular momentum transfer without other significant contributions. This structure can be interpreted as a novel phenomenon, i.e. the isovector soft dipole mode associated with the 6Li ground state. The population of this mode in the charge-exchange reaction is a dominant phenomenon for this reaction, being responsible for about 60% of the cross section obtained in the measured energy range.Comment: 8 pages, 7 figure

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Section: Data Analysis: Correlations In 6 Besupporting

confidence: 53%

Section: Theoretical Modelmentioning

confidence: 99%

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Isovector soft dipole mode in 6Be

et al. 2012

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“…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%

“…where Ψ (+) is a wave function (WF) with pure outgoing asymptotics obtained with the approximate boundary conditions of the three-body Coulomb problem [2,3].…”

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confidence: 99%

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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⁸He spectroscopy in stopped pion absorption by ¹¹B nuclei

Chernyshev

Gurov

Lapushkin

et al. 2019

J. Phys.: Conf. Ser.

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Level structure of 8He has been studied in the reaction of stopped pion absorption by 11B nuclei 11B(π−,pd)X. The experiment was carried out at the LANL with a two-arm semiconductor spectrometer. The missing mass spectrum in the range 0 MeV < MM < 50 MeV has been described by the superposition of phase-space distributions and the six states of 8He. Parameters of these states have been compared with data of other experimental and theoretical works.

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Soft dipole mode in 8He

Cited by 11 publications

References 24 publications

Isovector soft dipole mode in 6Be

Isovector soft dipole mode in 6Be

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

⁸He spectroscopy in stopped pion absorption by ¹¹B nuclei

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Soft dipole mode in 8He

Cited by 11 publications

References 24 publications

Isovector soft dipole mode in 6Be

Isovector soft dipole mode in 6Be

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

8He spectroscopy in stopped pion absorption by 11B nuclei

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⁸He spectroscopy in stopped pion absorption by ¹¹B nuclei