Spectroscopic study of β-delayed particle emission from proton-rich nucleus 23Si

Abstract

The [Formula: see text]-delayed particle emission from the exotic nucleus [Formula: see text]Si has been studied using a detection system with silicon array and clover-type high-purity germanium (HPGe) detectors. The [Formula: see text]-delayed charged-particle spectrum and [Formula: see text]-ray spectrum were identified. The half-life of [Formula: see text]Si has been determined. A new [Formula: see text]-delayed proton branch with an energy of 3811[Formula: see text]keV was observed. The [Formula: see text]-delayed two-proton emission was confirmed.

Network structure of thermonuclear reactions in nuclear landscape

“…The degree correlations between different layers are also investigated. The present work especially elucidates some novel features of nuclear reactions pre-arXiv:2006.00713v1 [nucl-th] 1 Jun 2020 (a) 30 60 vailing in nuclear astrophysics.…”

“…Much attention has been paid earlier on topics like the exploration up to limits of the nuclear landscape and searching for the island of stability [16][17][18][19][20][21][22][23]. The terrestrial nuclear reaction experiments provide a large volume of data for thermonuclear reaction rates (mainly on stable targets), based on which many theoretical models have been developed to calculate the binding energy of different nuclides and the cross-sections and reaction rates for different nuclear processes [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. The JINA REACLIB database is a well-known source of thermonuclear reaction rates [43], updated continuously and snapshotted regularly by the JINA Collaboration which aims to compile a complete set of nuclear reaction rates.…”

β -decay spectroscopy of S27

“…The resulting systematic uncertainty will be factored into the βdelayed γ -ray intensities reported in the following analyses. Though the β-delayed γ decays of 21 Mg and 23 Si were also measured, they cannot be used as calibration references due to the lack of available results in the literature [57,87]. A GEANT4 simulation including the implantation distributions and Q values of relevant nuclei was also performed to estimate the efficiency of DSSD3 for detecting β particles.…”

“…Silicon detectors play an important role for chargedparticle detection and various silicon-detector arrays have been built and successfully commissioned to measure the multiparticle and multistep decay modes expected in the nuclei near the proton-drip line [10,[51][52][53][54]. Several innovative new techniques and solutions such as printed circuit boards, cryogenic system, leading edge discrimination, front-back coincidence of double-sided silicon strip detectors (DSSDs), and energy calibration from an internal source were conceived and implemented on the bases of our previous decay measurements with an implantation method [11,[53][54][55][56][57][58][59] and complete-kinematics measurements [60][61][62][63]. In the present experiment, in order to reliably extract information about the very rare decay events from disturbances, a high signal-tonoise ratio, large solid-angle coverage, broad dynamic range, FIG.…”

Progress of experimental studies on two-proton emission

“…这些激发态双质子发射 过程的寿命一般都比较短, 大约在10 −21 s量级, 而这比 理论最初预言的基态双质子发射寿命短很多. 近年来, 中国学者利用国内外的放射性束流装置开展了系列实 验测量, 对 22 Al、 22,23 Si的β延迟双质子发射, 22 Mg、 23 Al、 27,28 P、 28,29 S等核的激发态双质子发射现象进行 研究并取得重要进展 [27~34] .…”