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Two-proton radioactivity of 67Kr and future studies with ACTAR TPC
The decay modes of proton-rich nuclei are dominated by β+ radioactivity. Beyond the proton drip line, the proton separation energy becomes negative, allowing the one- and two-proton emission to compete with β+ decay. Two-proton radioactivity reveals as a tool to study the nuclear structure of even-proton number nuclei beyond the drip line. This decay mode was discovered in 2002 with the investigation of 45Fe at GANIL and GSI. Then, the medium-mass emitters 48Ni and 54Zn were discovered. These observations were completed with experiments using time projection chambers, allowing to estimate the angular and energy correlations and explore nuclear structure. In the higher mass domain, the candidates 59Ge, 63Se and 67Kr were predicted by the local-mass models.

These nuclei were successfully produced in a fragmentation experiment performed at the RIKEN Nishina facility in 2015 and studied using the WAS3ABi-EURICA setup. The two-proton radioactivity of 67Kr was unambiguously identified [1,2]. I will present the results of this experiment and the comparison with the theoretical calculations. For the first time, these results disagree with theoretical models. The angular and energy correlations, accessible only by a tracking detector, need to be measured. In this context the ACTAR TPC time projection chamber, in development at CENBG [3,4], will perform a direct observation of 67Kr two-proton decay in the following years. I will present this detector, which has a better energy and angular resolution than the previous chambers used for two-proton study.

Then, I will present my work on the spectroscopy of super-heavy nuclei, as well as the transfermium elements (Z>99), and the development of the future SEASON detector, at IRFU (CEA Saclay), for future laser spectroscopy studies at LEB-S3.

[1] T. Goigoux et al., PRL. 117, 162501 (2016)
[2] B. Blank, T. Goigoux et al., PRC 93, 061301(R) (2016)
[3] J. Giovinazzo, T. Goigoux et al., NIM A 840, 15 (2016)
[4] J. Giovinazzo, J. Pibernat, T. Goigoux et al., NIM A 892, 114 (2018)
Thomas Goigoux
DPhN CEA Saclay
22/02/2019 à 11:00
IPN Orsay, salle A018, bâtiment 100



Institut de Physique Nucléaire Orsay - 15 rue Georges CLEMENCEAU - 91406 ORSAY (FRANCE)
UMR 8608 - CNRS/IN2P3

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