Location of the Neutron Dripline at Fluorine and Neon

Ahn, D. S.; Fukuda, N.; Geißel, H.; Inabe, N.; Iwasa, N.; Kubo, T.; Kusaka, K.; Morrissey, D. J.; Murai, D.; Nakamura, Takashi; Ohtake, M.; Otsu, H.; Sato, Hiromi; Sherrill, B. M.; Shimizu, Y.; Suzuki, Hiroshi; Takeda, Hiroyuki; Tarasov, O.; Ueno, H.; Yanagisawa, Y.; Yoshida, Kôichi

doi:10.1103/physrevlett.123.212501

Cited by 115 publications

(74 citation statements)

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“…On the proton-rich side, the drip line has been reached experimentally all the way up to 93 Np [1]. On the other hand, the neutron drip line has been delineated only for light nuclei up to 10 Ne [2] and for heavier elements it is based on theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

Quantified limits of the nuclear landscape

et al. 2020

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Background: The chart of the nuclides is limited by particle drip lines beyond which nuclear stability to proton or neutron emission is lost. Predicting the range of particle-bound isotopes poses an appreciable challenge for nuclear theory as it involves extreme extrapolations of nuclear masses well beyond the regions where experimental information is available. Still, quantified extrapolations are crucial for a wide variety of applications, including the modeling of stellar nucleosynthesis.Purpose: We use microscopic nuclear global mass models, current mass data, and Bayesian methodology to provide quantified predictions of proton and neutron separation energies as well as Bayesian probabilities of existence throughout the nuclear landscape all the way to the particle drip lines. Methods:We apply nuclear density functional theory with several energy density functionals. We also consider two global mass models often used in astrophysical nucleosynthesis simulations. To account for uncertainties, Bayesian Gaussian processes are trained on the separation-energy residuals for each individual model, and the resulting predictions are combined via Bayesian model averaging. This framework allows to account for systematic and statistical uncertainties and propagate them to extrapolative predictions. Results:We establish and characterize the drip-line regions where the probability that the nucleus is particlebound decreases from 1 to 0. In these regions, we provide quantified predictions for one-and two-nucleon separation energies. According to our Bayesian model averaging analysis, 7759 nuclei with Z ≤ 119 have a probability of existence ≥ 0.5. Conclusions:The extrapolation results obtained in this study will be put through stringent tests when new experimental information on existence and masses of exotic nuclei becomes available. In this respect, the quantified landscape of nuclear existence obtained in this study should be viewed as a dynamical prediction that will be fine-tuned when new experimental information and improved global mass models become available.

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Section: Introductionmentioning

confidence: 99%

Quantified limits of the nuclear landscape

et al. 2020

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“…Introduction.-The study of nuclei located at the neutron dripline, beyond which they are no longer bound with respect to neutron emission, has become possible due to significant technological developments in highintensity neutron-rich beams and high-efficiency detection arrays [1]. Despite these advances, the neutron dripline is only accessible experimentally for light nuclei (Z 10) [2], and even in this region it remains a theoretical challenge to predict it [3]. Models incorporating the effect of three-nucleon forces [4][5][6] have led to a better reproduction of the dripline.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…However, the effect of the continuum, which can drastically change the shell structure [7,8], is not taken into account except for lighter nuclei [9]. The comparison between the isotopic chains of carbon, nitrogen and oxygen on the one hand, and of fluorine on the other, is particularly interesting: the dripline is located at N = 16 for the former, while the fluorine chain extends to N = 22 ( 31 F [2]). The reason for this, however, is not fully understood.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…approximates the finite range of the NN interactions. The σ jp are the np and pp total cross sections, calculated here from the Charagi and Gupta parameterization of the experimental NN data [2] at the mid-target energy. The parameters α jp , the ratios of the real to the imaginary parts of the NN forward-scattering amplitudes, are interpolated from the tabulation of Ray [3].…”

Section: Proton Target Considerationsmentioning

confidence: 99%

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Extending the Southern Shore of the Island of Inversion to F28

Revel¹,

Sorlin²,

Marqués³

et al. 2020

Phys. Rev. Lett.

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Detailed spectroscopy of the neutron-unbound nucleus 28 F has been performed for the first time following proton/neutron removal from 29 Ne/ 29 F beams at energies around 230 MeV/nucleon. The invariant-mass spectra were reconstructed for both the 27 F ( * ) + n and 26 F ( * ) + 2n coincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as the 28 F ground state, with Sn( 28 F) = −199(6) keV, while analysis of the 2n decay channel allowed a considerably improved Sn( 27 F) = 1620(60) keV to be deduced. Comparison with shell-model predictions and eikonal-model reaction calculations have allowed spin-parity assignments to be proposed for some of the lower-lying levels of 28 F. Importantly, in the case of the ground state, the reconstructed 27 F+n momentum distribution following neutron removal from 29 F indicates that PACS numbers:

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“…[9][10][11] . 过去多年来放射性束物理研究由于受实验装置条件的限制, 主要集中在轻核的范围, 目前实验已达到大部分质子滴线核, 但中子滴线只到Z=10左右 [9,12,13] . 加速器装置.…”

Section: 放射性束物理研究自然界存在286种稳定原子unclassified