Two neutron decay from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mn>2</mml:mn><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math>state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>6</mml:mn></mml:msup><mml:mi mathvariant="normal">He</mml:mi></mml:math>

Kikuchi, Yoshihiro; Matsumoto, Takuma; Minomo, Kosho; Ogata, Kazuyuki

doi:10.1103/physrevc.88.021602

Cited by 21 publications

(31 citation statements)

References 31 publications

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“…These systems allow for the properties and decay mechanisms of nuclei with extreme neutron-to-proton ratios, existing beyond the driplines, to be examined. Of particular interest are the correlations present in the decay of these three-body systems which can offer new insights into the initial structure and configuration of the nucleus [7][8][9][10][11][12][13][14]. At the driplines, unique situations can present themselves in which the sequential decay process is forbidden and the "true" two-nucleon decay can be observed [15].…”

Section: Introductionmentioning

confidence: 99%

Three-body correlations in the ground-state decay ofO26

et al. 2015

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Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound 26 O can provide information on the ground-state wavefunction, which has been predicted to have a dineutron configuration and 2n halo structure.Purpose: To use the experimentally measured three-body correlations to gain insight into the properties of 26 O, including the decay mechanism and ground-state resonance energy. Method:26 O was produced in a one-proton knockout reaction from 27 F and the 24 O +n + n decay products were measured using the MoNA-Sweeper setup. The three-body correlations from the 26 O ground-state resonance decay were extracted. The experimental results were compared to Monte Carlo simulations in which the resonance energy and decay mechanism were varied. Results:The measured three-body correlations were well reproduced by the Monte Carlo simulations but were not sensitive to the decay mechanism due to the experimental resolutions. However, the three-body correlations were found to be sensitive to the resonance energy of 26 O. A 1σ upper-limit of 53 keV was extracted for the ground-state resonance energy of 26 O.Conclusions: Future attempts to measure the three-body correlations from the ground-state decay of 26 O will be very challenging due to the need for a precise measurement of the 24 O momentum at the reaction point in the target.

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Section: Introductionmentioning

confidence: 99%

Three-body correlations in the ground-state decay ofO26

et al. 2015

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“…This distribution has greater sensitivity to the initial 2p configuration of the decaying system [2]. In addition, the spin-singlet interaction in the p-p channel provides the virtual state ("diproton") which also can affect the long-range behavior of the correlations (see [23][24][25] for the corresponding effects in 2n decay). The theoretical prediction for ρ cut = 10 5 fm in Fig.…”

mentioning

confidence: 99%

“…Apart from the Coulomb interactions, predicted cor-relations show sensitivity to the initial 2p configuration and nuclear final-state interactions that are also evident in 2n decay [23][24][25]. While there are indications of such sensitivities in 2p data [2], the long-range Coulomb interactions must first be determined accurately before the effects of structure and nuclear final-state interactions can be better probed and properly accounted for.…”

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confidence: 99%

Observation of Long-Range Three-Body Coulomb Effects in the Decay ofNe16

et al. 2014

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The interaction of an E/A=57.6-MeV 17 Ne beam with a Be target was used to populate levels in 16 Ne following neutron knockout reactions. The decay of 16 Ne states into the three-body 14 O+p+p continuum was observed in the High Resolution Array (HiRA). For the first time for a 2p emitter, correlations between the momenta of the three decay products were measured with sufficient resolution and statistics to allow for an unambiguous demonstration of their dependence on the long-range nature of the Coulomb interaction. Contrary to previous measurements, our measured limit Γ < 80 keV for the intrinsic decay width of the ground state is not in contradiction with the small values (of the order of keV) predicted theoretically.PACS numbers: 25.10.+s, 23.50.+z, 21.60.Gx, 27.20.+n Introduction -Two-proton (2p) radioactivity [1] is the most recently discovered type of radioactive decay. It is a facet of a broader three-body decay phenomenon actively investigated within the last decade [2]. In binary decay, the correlations between the momenta of the two decay products are entirely constrained by energy and momentum conservation. In contrast for three-body decay, the corresponding correlations are also sensitive to the internal nuclear structure of the decaying system and the decay dynamics providing, in principle, another way to constrain this information from experiment. In 2p decay, as the separation between the decay products becomes greater than the range of the nuclear interaction, the subsequent modification of the initial correlations is determined solely by the Coulomb interaction between the decay products. As the range of the Coulomb force is infinite, its long-range contribution to the correlations can be substantial, especially, in heavy 2p emitters.

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“…Kikuchi and K. Ogata to analyze such experiments [17,18]. It is usually said that the angular correlation of the two neutrons after breakup is sensitive to the correlations between the two neutrons in the halo.…”

Section: Origin Of Di-neutron Correlations In Halo Nucleimentioning

confidence: 99%

Physics Program at the RIBF with MINOS

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Doornenbal²,

Corsi³

et al. 2015

Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014)

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MINOS is a new device composed of a thick hydrogen target and a vertex tracker [1]. It has been primarily conceived for the spectroscopy of rare isotopes produced at fragmentation facilities such as the RIKEN Radioactive Isotope Beam Facility. In the near future, MINOS in association with other detectors and spectrometers should contribute to exciting physics programs at the RIBF focusing on nuclei produced by hydrogen-induced secondary knockout reactions. The full detector and its electronics have been finalized at CEA Saclay and validated in Japan at the end of 2013. Among foreseen experiments, a scientific program named SEASTAR dedicated to the study of shell evolution and measurement of new 2 + state energies in medium-mass unstable nuclei has been initiated at the RIBF. SEASTAR aims at exploiting the unique opportunities offered by the RIBF and the association of the high-efficiency DALI2 gamma array [2] and MINOS. The first campaign was held in May 2014. In this communication, a brief presentation of the MINOS detection system is presented as well as the intended physics program at the RIBF. A report on the first SEASTAR campaign foreseen this spring is given.

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Two neutron decay from the21+state of6He

Cited by 21 publications

References 31 publications

Three-body correlations in the ground-state decay ofO26

Three-body correlations in the ground-state decay ofO26

Observation of Long-Range Three-Body Coulomb Effects in the Decay ofNe16

Physics Program at the RIBF with MINOS

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