Two-proton correlations in the decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Ni</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>48</mml:mn> </mml:mmultiscripts> </mml:math> and <mml:math xmlns:mml="htt

The main observables of the rare two-proton emission process---half-life, total energy of the decay, as well as energy and angular correlations between the emitted protons---have been measured for $^{48}\mathrm{Ni}$ and $^{45}\mathrm{Fe}$ in a recent experiment performed at the GANIL/LISE3 facility. The results, together with previous experimental work, are compared for the first time with calculations performed in the recently developed Gamow coupled-channel (GCC) framework and with three-body predictions from the literature. The comparison with the $^{48}\mathrm{Ni}$ and the $^{45}\mathrm{Fe}$ two-proton angular distributions with the GCC calculations confirms the adopted strength of the proton-proton interaction for both nuclei, and the predominance of emission at small angles. A comparison with three-body model angular distributions indicates the shell closure of the ${f}_{7/2}$ orbital for $^{48}\mathrm{Ni}$ and a substantial occupancy of the $p$ orbital for $^{45}\mathrm{Fe}$. Discrepancies between experimental data and theoretical predictions arise when studying the other observables: half-lives, total energy of the decay, and energy correlations, showing the complexity of the description of the two-proton emission process.

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Publication Details

Journal
Physical review. C
Published
2025-10-23
DOI
https://doi.org/10.1103/kqb5-z2xy
Primary Topic
Nuclear physics research studies
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article
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Two-proton correlations in the decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Ni</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>48</mml:mn> </mml:mmultiscripts> </mml:math> and <mml:math xmlns:mml="htt

J. C. Thomas, M. Hukkanen, P. Ascher, O. Sorlin et al.
Physical review. C
Nuclear physics research studies
article

Two-proton correlations in the decay of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mi>Ni</mml:mi> <mml:mprescripts/> <mml:none/> <mml:mn>48</mml:mn> </mml:mmultiscripts> </mml:math> and <mml:math xmlns:mml="htt

J. C. Thomas, M. Hukkanen, P. Ascher, O. Sorlin, T. Kurtukian‐Nieto, M. Vandebrouck, B. Fernández–Domínguez, Β. Blank, J. Piot, T. Roger, M. Gerbaux, A. Husson, M. Stănoiu, C. Borcea, S. Grévy, M. Caamaño, A. Ortega-Moral, A. de Roubin, J. Michaud, L. Cáceres, M. Pomorski, O. Kamalou, Á. M. Sánchez-Benítez, J. Giovinazzo, J. Lois-Fuentes, C. Stödel, D. Regueira-Castro, S. M. Wang, J. Pancin, F. de Oliveira Santos, D. Fernández-Domínguez
article en

Abstract

The main observables of the rare two-proton emission process---half-life, total energy of the decay, as well as energy and angular correlations between the emitted protons---have been measured for $^{48}\mathrm{Ni}$ and $^{45}\mathrm{Fe}$ in a recent experiment performed at the GANIL/LISE3 facility. The results, together with previous experimental work, are compared for the first time with calculations performed in the recently developed Gamow coupled-channel (GCC) framework and with three-body predictions from the literature. The comparison with the $^{48}\mathrm{Ni}$ and the $^{45}\mathrm{Fe}$ two-proton angular distributions with the GCC calculations confirms the adopted strength of the proton-proton interaction for both nuclei, and the predominance of emission at small angles. A comparison with three-body model angular distributions indicates the shell closure of the ${f}_{7/2}$ orbital for $^{48}\mathrm{Ni}$ and a substantial occupancy of the $p$ orbital for $^{45}\mathrm{Fe}$. Discrepancies between experimental data and theoretical predictions arise when studying the other observables: half-lives, total energy of the decay, and energy correlations, showing the complexity of the description of the two-proton emission process.

Physical review. CVol. 112(6)
Universidade de Santiago de Compostela (ES), Fudan University (CN), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), Center for Theoretical Physics (PL), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Laboratoire de Physique Corpusculaire de Caen (FR), Instituto de Física Teórica (ES), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), CEA Paris-Saclay (FR), Institute of Modern Physics (CN), Grand Accélérateur National d'Ions Lourds (FR), Laboratoire de Physique des Plasmas (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Universidad de Huelva (ES)
Openalex Percentile: Top 82%
Nuclear physics research studies
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