Exploring the manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model

Grigorenko, L. V.; Vaagen, J. S.; Zhukov, M. V.

doi:10.1103/physrevc.97.034605

Cited by 21 publications

(19 citation statements)

References 38 publications

(57 reference statements)

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“…In 26 O, the threshold effect dramatically changes the decay mechanism and asymptotic correlations. According to our calculations, the small reported value of Q 2n = 18 ± 5 keV suggests that the 2n decay of this nucleus can be understood in terms of the universal s-wave phasespace limit [28], in which the g.s. of 26 O attains the character of the core nucleus 24 O to which a pair of neutrons is weakly coupled [50].…”

mentioning

confidence: 61%

“…As discussed in Ref. [28], for small values of Q 2n the 2n decay is dominated by the s-wave component and the energy distribution approaches the universal phasespace limit:…”

mentioning

confidence: 83%

“…Its measured energy and angular 2p correlations [20] are rather different from those observed in 6 Be [21]. Another extreme oxygen isotope is the weakly neutron-unbound 26 O, with 18 neutrons, which is arguably the best current candidate for the phenomenon of 2n radioactivity [22][23][24][25][26][27][28][29]. The measured 2n correlations in 26 O have large uncertainties, as well as its 2n decay energy Q 2n .…”

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confidence: 99%

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Nucleon-nucleon correlations in the extreme oxygen isotopes

Wang,

Nazarewicz,

Charity

et al. 2021

Preprint

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There has been an upsurge of interest in two-nucleon decays thanks to the studies of nucleonnucleon correlations. In our previous work, based on a novel time-dependent three-body approach, we demonstrated that the energy and angular correlations of the emitted nucleons can shed light on the structure of nucleonic pairs formed inside the nucleus. In this work, we apply the new framework to study the decay dynamics and properties of some extreme proton-rich and neutron-rich oxygen isotopes, including two-proton (2p) decays of 11,12 O and two-neutron (2n) decay of 26 O. Here we show that the low-components of 11,12 O wave functions, which are affected by continuum and configuration-interaction effects, strongly impact decay dynamics and asymptotic correlations. In the calculated wave functions of 11,12 O, diproton and cigarlike structures merge together during the tunneling process and the resulting energy-and angular correlations are very consistent with the experimental data. The asymptotic correlations of the 2n decay of 26 O dramatically change as the two-neutron decay energy approaches the zero-energy threshold. The small reported value of Q2n suggests that the 2n decay of this nucleus can be understood in terms of the universal phase-space limit.

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mentioning

confidence: 61%

“…As discussed in Ref. [28], for small values of Q 2n the 2n decay is dominated by the s-wave component and the energy distribution approaches the universal phasespace limit:…”

mentioning

confidence: 83%

mentioning

confidence: 99%

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Nucleon-nucleon correlations in the extreme oxygen isotopes

Wang,

Nazarewicz,

Charity

et al. 2021

Preprint

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“…Within this formalism, the relative p-p energy is given by the configuration mixing of the three-body wave function of the emitter, that may lead to an 'anti-correlation' (strength at high relative energy, back-to-back emission) or even to oscillatory patterns [19,20]. Recently, a similar formalism has been proposed for core-n-n decays [21]. However, the core-n-n final states measured to date do not exhibit any such patterns.…”

Section: The Decay Modelmentioning

confidence: 99%

Chronology of the three-body dissociation of ⁸He

Bouchet¹,

Marqués²,

Angulo³

et al. 2019

J. Phys. G: Nucl. Part. Phys.

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The space and time configurations of the dissociation of 8 He into 6 He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and 6 He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of 7 He, consistent with neutrons being emitted from a Gaussian volume of r rms nn = 7.3 ± 0.6 fm with a n-n delay in the sequential channel of 1400 ± 400 fm/c, in agreement with the lifetime of 7 He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n-n delay. The validity of the phenomenological model used is discussed.

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“…In contrast to "conventional" two-body decays, three-body decays encrypt a lot of additional information in the momentum (energy and angular) correlations of the decay products. Theoretical studies indicate that both effects of the initial nuclear structure and the decay mechanism may show up in the core+n+n and core+p+p fragment correlation patterns in various ways [2,3,4,5,6,7,8,9,10,11,12,13].…”

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confidence: 99%

Pauli-principle driven correlations in four-neutron nuclear decays

Sharov,

Grigorenko,

Ismailova

et al. 2018

Preprint

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Mechanism of simultaneous non-sequential four-neutron (4n) emission (or "true" 4n-decay) has been considered in phenomenological five-body approach. This approach is analogous to the model of the direct decay to the continuum often applied to 2n-and 2p-decays. It is demonstrated that 4n-decay fragments should have specific energy and angular correlations reflecting strong spatial correlations of "valence" nucleons orbiting in their 4n-precursors. Due to the Pauli exclusion principle, the valence neutrons are pushed to the symmetryallowed configurations in the 4n-precursor structure, which causes a "Pauli focusing" effect. Prospects of the observation of the Pauli focusing have been considered for the 4n-precursors 7 H and 28 O. Fingerprints of their nuclear structure or/and decay dynamics are predicted.

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Exploring the manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model

Cited by 21 publications

References 38 publications

Nucleon-nucleon correlations in the extreme oxygen isotopes

Nucleon-nucleon correlations in the extreme oxygen isotopes

Chronology of the three-body dissociation of ⁸He

Pauli-principle driven correlations in four-neutron nuclear decays

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Exploring the manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model

Cited by 21 publications

References 38 publications

Nucleon-nucleon correlations in the extreme oxygen isotopes

Nucleon-nucleon correlations in the extreme oxygen isotopes

Chronology of the three-body dissociation of 8He

Pauli-principle driven correlations in four-neutron nuclear decays

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Product

Resources

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Chronology of the three-body dissociation of ⁸He