Jacob Bekker
(University of the Witwatersrand, iThemba LABS, South Africa)
The PANDORA (Photo-Absorption of Nuclei and Decay Observation for Reactions in Astrophysics) project explores photo-nuclear reactions in light nuclei (A $<$ 60) through both experimental and theoretical studies. This research is particularly relevant to ultra-high-energy cosmic rays (UHECRs), where energy and mass loss primarily occur via electromagnetic interactions between nuclei and the cosmic microwave background, driven by the isovector giant dipole resonance (IVGDR) and it also has profound significance for nuclear physics for reaction calculations, theoretical models and nuclear data benchmarks. A key limitation in current UHECR propagation models is the scarcity of reliable experimental data for critical nuclei. To address this, PANDORA will utilize virtual photon experiments at iThemba LABS and RCNP, as well as real photon experiments at ELI-NP, to extract essential nuclear parameters, including IVGDR cross-sections, E1 strength distributions, and branching ratios for particle decay. The project's first experiment was conducted at RCNP in late 2023, focusing on photo-absorption and charged particle decay in $^{12}$C and $^{13}$C. This study utilized the Grand Raiden spectrometer, SAKRA (a backward-angle silicon detector array), and SCYLLA (a LaBr$_3$ detector array). This presentation will discuss the analysis of these measurements and their implications for UHECR propagation, particularly in refining loss length calculations.
This work is based on the research supported in part by the Japan-South Africa Bilateral Funding from JSPS with a grant number of JPJSBP 120216502 and from NRF with grant number 132993, the National Research Foundation of South Africa through Grants No. 129411, and 118846 and the SARCHI grant number 180529336567 and supported in part by the National Research Foundation (NRF) of South Africa grant number 118846, the Romanian Ministry of Research, Innovation and Digitization, CNCS - UEFISCDI, project number PN-III-P4-PCE-2021-0595, within PNCDI III
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Atsushi Tamii
(RCNP)
Jacob Bekker
(University of the Witwatersrand, iThemba LABS, South Africa)
Luna Pellegri
(University of the Witwatersrand and iThemba LABS)
Dr
PA Söderström
(Extreme Light Infrastructure-Nuclear Physics (ELI-NP))
Retief Neveling
(iThemba LABS)
Agnese Giaz
(Dipartimento di Fisica dell'Universita degli Studi di Milano, I-20133 Milano, Italy)
Prof.
Andreas Görgen
(Department of Physics, University of Oslo)
Ms
Andreea Gavrilescu
(Extreme Light Infrastructure-Nuclear Physics (ELI-NP))
Armand Bahini
(IThemba LABS)
Dr
Asli Kosuglu
(Extreme Light Infrastructure-Nuclear Physics (ELI-NP))
Dr
Bruny Baret
(Laboratoire Astroparticule et Cosmologie, Universite Paris Cite, CNRS, F-75013 Paris, France)
Dr
C Wang
(Peking University)
Dr
D Balabanski
(Extreme Light Infrastructure-Nuclear Physics (ELI-NP))
Dr
Denis Allard
(Laboratoire Astroparticule et Cosmologie, Universite Paris Cite, CNRS, F-75013 Paris, France)
Ms
Elise Martinsen
(Department of Physics, University of Oslo)
F Furakawa
(Research Center for Nuclear Physics (RCNP), Osaka University)
Mr
H Shibakita
(Department of Physics, Osaka University)
Mr
H Shimojo
(Department of Physics, Osaka University)
Mr
Igor Jurosevic
(TU-Darmstadt)
Ms
J Finsrud
(Department of Physics, University of Oslo)
Mr
JK Dahl
(Department of Physics, University of Oslo)
Dr
JW Brümmer
(iThemba LABS)
Prof.
Junki Tanaka
(Research Center for Nuclear Physics (RCNP), Osaka University)
Dr
K Sakanashi
(Department of Physics, Osaka University)
Prof.
KCW Li
(Department of Physics, University of Oslo)
Mr
Katje Zhou
(Peking University)
Mr
Max Spall
(TU-Darmstadt)
Dr
Nobu Kobayashi
(Research Center for Nuclear Physics (RCNP), Osaka University)
Dr
Oliver Wieland
(Dipartimento di Fisica dell’Universit`a degli Studi di Milano, I-20133 Milano, Italy)
Pete Jones
(iThemba LABS)
Peter von Neuman-Cosel
(TU-Darmstadt)
Dr
R Iwasaki
(Research Center for Nuclear Physics (RCNP), Osaka University)
Refilwe Emily Molaeng
(School of Physics, University of the Witwatersrand, Johannesburg, South Africa)
Dr
S Okamoto
(Department of Physics, Kyoto University)
Prof.
S Ota
(Department of Physics, Kyoto University)
Sifundo D Binda
(School of Physics, University of the Witwatersrand, Johannesburg, South Africa)
Prof.
Sunniva Siem
(Department of Physics, University of Oslo)
Dr
T Okamura
(Department of Physics, Kyoto University)
Prof.
Takahiro Kawabata
(Department of Physics, Osaka University)
Prof.
Tatsyuya Furuno
(Department of Physics, Osaka University)
Dr
Thuthukile Khumalo
(NRF-iThemba LABS)
Dr
Vetle Ingeberg
(Department of Physics, University of Oslo)
Dr
Wanja Paulsen
(Department of Physics, University of Oslo)
Dr
Y Fujikawa
(Department of Physics, Kyoto University)
Mr
Yohei Sasagawa
(Research Center for Nuclear Physics (RCNP), Osaka University)
Mr
Yuya Honda
(Department of Physics, University of Oslo)
Dr
Zaihong Yang
(Peking University)
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