The decay characteristic of ²²Si and its ground-state mass significantly affected by three-nucleon forces

2016/10/26 by Xinxing Xu, Xu, X. X., C. J. Lin +87
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1610.08291

openalex publication_date 2016/10/26 · openalex created_date 2016/11/04 · openalex updated_date 2026/07/28

Abstract

The decay of the proton-rich nucleus ²²Si was studied by a silicon array coupled with germanium clover detectors. Nine charged-particle groups are observed and most of them are recognized as β-delayed proton emission. A charged-particle group at 5600 keV is identified experimentally as β-delayed two-proton emission from the isobaric analog state of ²²Al. Another charged-particle emission without any β particle at the low energy less than 300 keV is observed. The half-life of ²²Si is determined as 27.5 (18) ms. The experimental results of β-decay of ²²Si are compared and in nice agreement with shell-model calculations. The mass excess of the ground state of ²²Si deduced from the experimental data shows that three-nucleon (3N) forces with repulsive contributions have significant effects on nuclei near the proton drip line.

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