Deep excursion beyond the proton dripline. II. Toward the limits of existence of nuclear structure

Grigorenko, L. V.; Mukha, I.; Kostyleva, D.; Scheidenberger, C.; Acosta, L.; Casarejos, E.; Chudoba, V.; Ciemny, A. A.; Dominik, W.; Dueñas, J. A.; Dunin, V. B.; Espino, J. M.; Estradé, A.; Farinon, F.; Фомичев, А. С.; Geißel, H.; Gorshkov, A. V.; Janas, Z.; Kamiński, G.; Kiselev, O.; Knöbel, R.; Krupko, S. A.; Kuich, M.; Litvinov, Yu. A.; Marquínez-Durán, G.; Martel, I.; Mazzocchi, C.; Nikolskii, E. Yu.; Nociforo, C.; Orduz, Angie; Pfützner, M.; Piétri, S.; Pomorski, M.; Procházka, A.; Rymzhanova, S.; Sánchez-Benítez, Á. M.; Sharov, P. G.; Simon, H.; Sitár, B.; Slepnev, R. S.; Stănoiu, M.; Strmeň, P.; Szarka, I.; Takechi, M.; Tanaka, Y. K.; Weick, H.; Winkler, M.; Winfield, J. S.; Xu, X.; Zhukov, M. V.

doi:10.1103/physrevc.98.064309

Cited by 6 publications

(7 citation statements)

References 23 publications

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“…In addition, several broad resonances associated with 2p decay were reported in, e.g., 6 Be [19] and 11,12 O [20,21]. The unique experimental data on lifetimes and correlations between emitted protons has triggered considerable theoretical interest [22][23][24][25][26][27][28].…”

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confidence: 99%

Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei

et al. 2020

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Background: The limits of the nuclear landscape are determined by nuclear binding energies. Beyond the proton drip lines, where the separation energy becomes negative, there is not enough binding energy to prevent protons from escaping the nucleus. Predicting properties of unstable nuclear states in the vast territory of proton emitters poses an appreciable challenge for nuclear theory as it often involves far extrapolations. In addition, significant discrepancies between nuclear models in the proton-rich territory call for quantified predictions.Purpose: With the help of Bayesian methodology, we mix a family of nuclear mass models corrected with statistical emulators trained on the experimental mass measurements, in the proton-rich region of the nuclear chart.Methods: Separation energies were computed within nuclear density functional theory using several Skyrme and Gogny energy density functionals. We also considered mass predictions based on two models used in astrophysical studies. Quantified predictions were obtained for each model using Bayesian Gaussian processes trained on separation-energy residuals and combined via Bayesian model averaging. Results:We obtained a good agreement between averaged predictions of statistically corrected models and experiment. In particular, we quantified model results for one-and two-proton separation energies and derived probabilities of proton emission. This information enabled us to produce a quantified landscape of proton-rich nuclei. The most promising candidates for two-proton decay studies have been identified. Conclusions:The methodology used in this work has broad applications to model-based extrapolations of various nuclear observables. It also provides a reliable uncertainty quantification of theoretical predictions.

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confidence: 99%

Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei

et al. 2020

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“…In Ref. [2], the isotopes 26 Ar and 25 Cl were predicted as the most remote nuclear configurations with identified g.s.. Similar predictions allow to expect a number of previously-unknown unbound isotopes located within a relatively broad (by 2-5 atomic mass units) area along the proton drip line.…”

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confidence: 62%

“…In recent experimental [1] and theoretical [2] studies of the lightest isotopes in the argon and chlorine isotope chains, limits of existence of the corresponding nuclear structure were addressed. For the issue of existence of nuclear structure, we adopt the approach used in Ref.…”

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Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope K31 by Measuring Its Three-Proton Decay

Kostyleva¹,

Mukha²,

Acosta³

et al. 2019

Phys. Rev. Lett.

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The most-remote from stability isotope 31 K, which is located four atomic mass units beyond the proton drip line, has been observed. It is unbound in respect to three-proton (3p) emission, and its decays have been detected in flight by measuring trajectories of all decay products using micro-strip detectors. The 3p-emission processes have been studied by means of angular correlations 28 S+3p and the respective decay vertexes. The energies of the previously-unknown ground and excited states of 31 K have been determined. This provides its 3p separation-energy value S3p of −4.6(2) MeV. Upper half-life limits of 10 ps of the observed 31 K states have been derived from distributions of the measured decay vertexes.

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“…Here, one can raise the question about the limits of existence of such nuclear structure. In order to investigate this on the neutrondeficient side of the nuclear chart, we performed detailed investigations of argon and chlorine proton-unbound isotopes [1][2][3]. All three articles report studies done via trajectories measurement of the in-flight decay products performed at the fragment-separator and spectrometer FRS at GSI, Darmstadt.…”

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Exploration of Nuclear Structure Along the Proton-unbound Argon and Chlorine Isotopes

Kostyleva¹

2019

Acta Phys. Pol. B

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A systematic investigation of the argon and chlorine isotopes located by two and three mass units beyond the proton drip line was performed recently at the FRS. A state-of-the-art tracking technique with silicon microstrip detectors allowed for measurement of the trajectories of argon and chlorine in-flight decay products. These data were used to reconstruct angular correlations between decay products, which allowed to assign the energy levels to 31 Ar and 30 Cl for the first time. On the basis of the observed excited states in 31 Ar and a new estimation of its two-proton separation energy S 2p of a few keV, the prospects for further studies of low-binding effects of this nucleus are presented.

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Deep excursion beyond the proton dripline. II. Toward the limits of existence of nuclear structure

Cited by 6 publications

References 23 publications

Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei

Beyond the proton drip line: Bayesian analysis of proton-emitting nuclei

Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope K31 by Measuring Its Three-Proton Decay

Exploration of Nuclear Structure Along the Proton-unbound Argon and Chlorine Isotopes

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