4D-imaging of drip-line radioactivity by detecting proton emission from 54mNi pictured with ACTAR TPC

J. Giovinazzo (), T. Roger, B. Blank, D. Rudolph, B. A. Brown, H. Alvarez-Pol, A. Arokia Raj, P. Ascher, M. Caamaño-Fresco, L. Caceres, D. M. Cox, B. Fernández-Domínguez, J. Lois-Fuentes, M. Gerbaux, S. Grévy, G. F. Grinyer, O. Kamalou, B. Mauss, A. Mentana, J. Pancin, J. Pibernat, J. Piot, O. Sorlin, C. Stodel, J.-C. Thomas and M. Versteegen
Additional contact information
J. Giovinazzo: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
T. Roger: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
B. Blank: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
D. Rudolph: Lund University
B. A. Brown: Michigan State University
H. Alvarez-Pol: Univ. of Santiago de Compostela
A. Arokia Raj: Instituut voor Kern- en Stralingsfysica, KU Leuven
P. Ascher: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
M. Caamaño-Fresco: Univ. of Santiago de Compostela
L. Caceres: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
D. M. Cox: Lund University
B. Fernández-Domínguez: Univ. of Santiago de Compostela
J. Lois-Fuentes: Univ. of Santiago de Compostela
M. Gerbaux: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
S. Grévy: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
G. F. Grinyer: University of Regina
O. Kamalou: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
B. Mauss: RIKEN Nishina Center
A. Mentana: Instituut voor Kern- en Stralingsfysica, KU Leuven
J. Pancin: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
J. Pibernat: UMR 5797 CNRS/IN2P3 - Université de Bordeaux
J. Piot: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
O. Sorlin: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
C. Stodel: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
J.-C. Thomas: Grand Accélérateur National d’Ions Lourds, CEA/DRF-CNRS/IN2P3, B.P. 55027
M. Versteegen: UMR 5797 CNRS/IN2P3 - Université de Bordeaux

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi)bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions.

Date: 2021
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DOI: 10.1038/s41467-021-24920-0

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