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Nuclear Theory·nucl-th

Wednesday·May 10, 2023

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    Decay of superheavy nuclei based on the random forest algorithm

    Boshuai Cai · Cenxi Yuan

    How nuclides decay in the superheavy region is key information for investigating new elements beyond oganesson and the island of stability. The Random Forest algorithm is applied to study the competition between different decay modes in the superheavy region, including decay, decay, decay, electron capture and spontaneous fission. The observed half-lives and dominant decay mode are well reproduced. The dominant decay mode of 96.9 % nuclei beyond Po is correctly described. decay is predicted to be the dominant decay mode for isotopes in new elements , except for spontaneous fission in some even-even ones because of the odd-even staggering effect. The predicted half-lives show the existence of a long-lived spontaneous fission island at the southwest of Fl caused by the competition of nuclear deformation and Coulomb repulsion. More understanding of spontaneous fission, especially beyond Fl, is crucial to search for new elements and the island of stability.

    nucl-thNucl.Sci.Tech.(2023)·21 citations
  2. 02

    Investigation of unbound hydrogen isotopes with the Gamow shell model

    H. H. Li · J. G. Li · N. Michel · W. Zuo

    Although they are part of the lightest nuclei, the hydrogen isotopes are not well understood both experimentally and theoretically. Indeed, besides deuteron and triton, all known hydrogen isotopes are resonances of complex structure. Even more elusive is 7H, which may have been observed experimentally and has been claimed to be a narrow resonance. Nevertheless, even its existence is controversial, and its theoretical study is difficult due to both its unbound character and large number of interacting valence nucleons. It is then the object of this paper to theoretically study the hydrogen isotopes {4-7}H with the Gamow shell model, which is, up to our knowledge, the first direct calculation of unbound resonance hydrogen isotopes up to 7H. As the Gamow shell model includes both continuum coupling and inter-nucleon correlations, useful information can be obtained about poorly known unbound hydrogen isotopes. Our present calculations indicate that {4,6}H ground states are fairly broad resonances, whereas those of {5,7}H are narrow, which is in accordance with current experimental data. The results then suggest that, in particular, {5,7}H should be more heavily studied, as they might well be among the most narrow neutron resonances of the light nuclear chart.

    nucl-thPRC(2021)·13 citations
  3. 03

    Quark exchange effects in single flavored dibaryons

    Cheng-Rong Deng🇨🇳

    We reveal the quark exchange effects related to both the kinetic energy and various interactions in the single flavored dibaryon bound states with in the quark models. The hadron covalent bond can be established by the shared identical quarks due to the quark exchange effect between two colorless baryons. Such hadron covalent bond plays a decisive role in the deuteronlike di- and di- covalent molecule states. The -meson exchange is indispensable in the deuteronlike di- and compact di- states. The hadron covalent bond clearly appears in the di- state but is hidden in the di- state. The chromomagnetic interaction is always repulsive in the di-, di-, di-, and di- states. The color-electric interaction is strongly attractive in the di- state but weakly attractive or repulsive in the di-, di-, and di- states.

    nucl-thhep-phPRD(2023)·3 citations
  4. 04

    Quest for a Universal Cluster Preformation Formula: A new paradigm for estimating the cluster formation energy

    Joshua T. Majekodunmi · Raj Kumar · M. Bhuyan

    This study presents a holistic picture of the preformation of nuclear clusters with credence to the kinematics of their emissions. Besides the fitting of the preformation formula to reproduce the experimental half-lives, we have investigated the interrelationship between the parameters involved in the cluster decay process for medium, heavy and superheavy nuclei. Based on the established conceptual findings, we propose a new cluster preformation probability () formula that incorporates all influential parameters of the cluster radioactivity and thus has an edge over the existing formulae in the literature. Further, we hypothesize that a fraction of the decay energy is needed for cluster formation within the parent nucleus. The proposed formula opens a new paradigm to separately estimate the energy contributed during the cluster formation from its emission and thus shows that the contribution of the Q-value splits into three major parts accounting for the energy contributed during the cluster preformation, its emission and recoil of the daughter nucleus. Moreover, the expression is adept at accommodating the theorized concept of heavy particle radioactivity (HPR). The result reveals that, like -decay, a proper estimation of the and -value in the cluster studies are enriched with qualitative information about the nuclear structure. However, from the analysis, the Geiger-Nuttall law is not the best compromise in the clustering due to the non-linearity between and , unlike in -decay. We have demonstrated that with the inclusion of the proposed formula, the half-life predictions from both microscopic R3Y and phenomenological M3Y NN potentials closely agree with the available experimental data and that the slight variation can be traced to their peculiar barrier characteristics.

    nucl-thEPL(2023)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE