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  1. Artikel ; Online: Extending the Hoyle-State Paradigm to ^{12}C+^{12}C Fusion.

    Adsley, P / Heine, M / Jenkins, D G / Courtin, S / Neveling, R / Brümmer, J W / Donaldson, L M / Kheswa, N Y / Li, K C W / Marín-Lámbarri, D J / Mabika, P Z / Papka, P / Pellegri, L / Pesudo, V / Rebeiro, B / Smit, F D / Yahia-Cherif, W

    Physical review letters

    2022  Band 129, Heft 10, Seite(n) 102701

    Abstract: Carbon burning is a key step in the evolution of massive stars, Type 1a supernovae and superbursts in x-ray binary systems. Determining the ^{12}C+^{12}C fusion cross section at relevant energies by extrapolation of direct measurements is challenging due ...

    Abstract Carbon burning is a key step in the evolution of massive stars, Type 1a supernovae and superbursts in x-ray binary systems. Determining the ^{12}C+^{12}C fusion cross section at relevant energies by extrapolation of direct measurements is challenging due to resonances at and below the Coulomb barrier. A study of the ^{24}Mg(α,α^{'})^{24}Mg reaction has identified several 0^{+} states in ^{24}Mg, close to the ^{12}C+^{12}C threshold, which predominantly decay to ^{20}Ne(ground state)+α. These states were not observed in ^{20}Ne(α,α_{0})^{20}Ne resonance scattering suggesting that they may have a dominant ^{12}C+^{12}C cluster structure. Given the very low angular momentum associated with sub-barrier fusion, these states may play a decisive role in ^{12}C+^{12}C fusion in analogy to the Hoyle state in helium burning. We present estimates of updated ^{12}C+^{12}C fusion reaction rates.
    Sprache Englisch
    Erscheinungsdatum 2022-09-16
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.102701
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: ^{138}Ba(d,α) Study of States in ^{136}Cs: Implications for New Physics Searches with Xenon Detectors.

    Rebeiro, B M / Triambak, S / Garrett, P E / Ball, G C / Brown, B A / Menéndez, J / Romeo, B / Adsley, P / Lenardo, B G / Lindsay, R / Bildstein, V / Burbadge, C / Coleman, R / Diaz Varela, A / Dubey, R / Faestermann, T / Hertenberger, R / Kamil, M / Leach, K G /
    Natzke, C / Nzobadila Ondze, J C / Radich, A / Rand, E / Wirth, H-F

    Physical review letters

    2023  Band 131, Heft 5, Seite(n) 52501

    Abstract: We used the ^{138}Ba(d,α) reaction to carry out an in-depth study of states in ^{136}Cs, up to around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved states below the first 1^{+} level, which are important in the context of solar ... ...

    Abstract We used the ^{138}Ba(d,α) reaction to carry out an in-depth study of states in ^{136}Cs, up to around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved states below the first 1^{+} level, which are important in the context of solar neutrino and fermionic dark matter (FDM) detection in large-scale xenon-based experiments. We identify for the first time candidate metastable states in ^{136}Cs, which would allow a real-time detection of solar neutrino and FDM events in xenon detectors, with high background suppression. Our results are also compared with shell-model calculations performed with three Hamiltonians that were previously used to evaluate the nuclear matrix element (NME) for ^{136}Xe neutrinoless double beta decay. We find that one of these Hamiltonians, which also systematically underestimates the NME compared with the others, dramatically fails to describe the observed low-energy ^{136}Cs spectrum, while the other two show reasonably good agreement.
    Sprache Englisch
    Erscheinungsdatum 2023-08-09
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.131.052501
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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