Clarifying the radiative decay of the Hoyle state with charged-particle spectroscopy
A detailed knowledge of the decay properties of the so called Hoyle state in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mrow></mml:mrow> <mml:mrow></mml:mrow> <mml:mn>12</mml:mn></mml:mmultiscripts> </mml:math> C nucleus ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow><mml:msub><mml:mi>E</mml:mi> <mml:mi>x</mml:mi></mml:msub> <mml:mo>=</mml:mo> <mml:mn>7.654</mml:mn></mml:mrow> </mml:math> MeV, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>0</mml:mn> <mml:mo>+</mml:mo></mml:msup> </mml:math> ) is required to calculate the rate at which carbon is forged in typical red-giant stars. This paper reports on a new almost background-free measurement of the radiative decay branching ratio of the Hoyle state using advanced charged particle coincidence techniques. The exploitation, for the first time in a similar experiment, of a bidimensional map of the coincidence efficiency allows to reach an unitary value and, consequently, to strongly reduce sources of systematic uncertainties. The present results suggest a value of the radiative branching ratio of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow><mml:msub><mml:mi>Γ</mml:mi> <mml:mrow><mml:mi>rad</mml:mi></mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:msub><mml:mi>Γ</mml:mi> <mml:mrow><mml:mi>tot</mml:mi></mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>4.4</mml:mn> <mml:mrow><mml:mo>(</mml:mo> <mml:mn>6</mml:mn> <mml:mo>)</mml:mo></mml:mrow> <mml:mo>·</mml:mo> <mml:msup><mml:mn>10</mml:mn> <mml:mrow><mml:mo>-</mml:mo> <mml:mn>4</mml:mn></mml:mrow> </mml:msup> </mml:mrow> </mml:math> . This finding helps to resolve the tension between recent data published in the literature.
Authors
- F. Gramegna (ORCID: https://orcid.org/0000-0001-6112-0602)
- A. Massara (ORCID: https://orcid.org/0000-0002-2160-1126)
- D. Rapagnani (ORCID: https://orcid.org/0000-0001-8183-0994)
- Luigi Redigolo (ORCID: https://orcid.org/0000-0003-4623-469X)
- A. Ordine (ORCID: https://orcid.org/0000-0002-2454-960X)
- G. Verde (ORCID: https://orcid.org/0000-0002-8622-8297)
- Isabela Tišma
- D. Tagnani (ORCID: https://orcid.org/0000-0003-0124-5088)
- I. Lombardo (ORCID: https://orcid.org/0000-0002-2686-9164)
- A. Camaiani (ORCID: https://orcid.org/0000-0002-0417-0045)
- S. Piantelli (ORCID: https://orcid.org/0000-0002-0669-2787)
- G. Pasquali (ORCID: https://orcid.org/0000-0002-3166-3857)
- D. Stramaccioni
- G. Imbriani (ORCID: https://orcid.org/0000-0002-7037-6770)
- M. Vigilante (ORCID: https://orcid.org/0000-0002-4247-0938)
- S. Barlini (ORCID: https://orcid.org/0000-0001-5991-2280)
- Franco Angelini (ORCID: https://orcid.org/0000-0003-2559-9569)
- M. Cicerchia (ORCID: https://orcid.org/0000-0001-8216-7186)
- Andreas Best (ORCID: https://orcid.org/0000-0001-8869-9757)
- B. Góngora Servín
- L. Palada
- E. Pilotto
- G. Casini (ORCID: https://orcid.org/0000-0002-0270-4437)
- Milan Sigmund (ORCID: https://orcid.org/0000-0003-3973-3626)
- C. Ciampi (ORCID: https://orcid.org/0000-0002-8142-0052)
- A. Gottardo (ORCID: https://orcid.org/0000-0002-0390-5767)
- T. Marchi (ORCID: https://orcid.org/0000-0001-7339-8185)
- J. Diklić (ORCID: https://orcid.org/0009-0003-0112-4945)
- D. Mengoni (ORCID: https://orcid.org/0000-0001-7219-2548)
- D. Dell’Aquila (ORCID: https://orcid.org/0000-0001-5895-0664)
- M. D’Andrea (ORCID: https://orcid.org/0000-0003-3844-8671)
- L. Baldesi (ORCID: https://orcid.org/0009-0007-2164-615X)
- D. Fabris (ORCID: https://orcid.org/0000-0001-8118-8057)
- N. Vukman (ORCID: https://orcid.org/0000-0002-1727-4871)
- A. A. Stefanini (ORCID: https://orcid.org/0000-0002-5965-6114)
- S. Valdré (ORCID: https://orcid.org/0000-0003-3629-6408)
Institutions
- University of Padua (IT)
- University of Catania (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Catania (IT)
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud (IT)
- Ruđer Bošković Institute (HR)
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT)
- University of Florence (IT)
- University of Naples Federico II (IT)
Publication Details
- Journal
- Scientific Reports
- Published
- 2024-08-15
- DOI
- https://doi.org/10.1038/s41598-024-68415-6
- Citations
- 9
- Primary Topic
- Quantum Chromodynamics and Particle Interactions
- Type
- article
- Field-Weighted Citation Impact
- 5.94
Funders
- Università degli Studi di Napoli Federico II
- Znanstveni centar izvrsnosti za napredne materijale i senzore, Hrvatska Zaklada za Znanost
- Ministero dell’Istruzione, dell’Università e della Ricerca
- Hrvatska Zaklada za Znanost
- Università di Catania