Observation of two-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>emission from high-lying excited states of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ne</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>18</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>by complete-kinematics measurements

Xu, X. X.; Lin, C. J.; Jia, H. M.; Feng, Yan; Fu, Jia; Wu, Zihao; Zhang, S. T.; Liu, Z. H.; Zhang, H. Q.; Xu, H. S.; Sun, Z. Y.; Wang, J. S.; Hu, Zhengguo; Wang, M.; Chen, R. F.; Zhang, X. Y.; Li, C.; Lei, X. G.; Xu, Zhiguo; Xiao, G. Q.; Wenlong, Zhan

doi:10.1103/physrevc.82.064316

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…Silicon detector is essential for charged-particle detection and various silicon-detector arrays have been built and successfully commissioned to measure the multi-particle and multi-step decay modes expected in the nuclei near the protondrip line [7,[51][52][53][54]. Several innovative new techniques and solutions such as printed circuit boards, cryogenic system, leading edge discrimination, front-back coincidence of DSSD, and energy calibration from an internal source were conceived and implemented on the bases of our previous decay measurements with an implantation method [8,[53][54][55][56][57][58] and completekinematics measurements [59][60][61][62]. In the present experiment, in order to reliably extract information about the very rare decay events from disturbances, a high signal-to-noise ratio, a large solid angle coverage, a broad dynamic range, and operation stability of the detection system were achieved by combining all the techniques.…”

Section: Introductionmentioning

confidence: 99%

Beta-decay spectroscopy of $^{27}$S

Sun,

Xu,

Hou

et al. 2018

Preprint

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Background Beta-decay spectroscopy provides valuable nuclear physics input for thermonuclear reaction rates of astrophysical interest and stringent test for shell-model theories far from the stability line.Purpose The available decay properties of proton drip-line nucleus 27 S are insufficient to constrain the properties of the key resonance in 26 Si(p, γ) 27 P reaction rate and probe the possible mirror asymmetry. The decay scheme of 27 S is complicated and far from being understood, which has motivated but also presented substantial challenges for our experiment.Method The 27 S ions were implanted into a double-sided silicon strip detector array surrounded by the high-purity germanium detectors, where the β-delayed protons and γ rays were measured simultaneously. ResultsThe precise half-life of 27 S, the excitation energies, β-feeding intensities, log f t values, and B(GT) values for the states of 27 P populated in the β decay of 27 S are determined. The improved spectroscopic properties including are compared to the mirror β decay of 27 Na and to the shell-model calculations using the recently-developed USD * interaction. The present work has expanded greatly on the previously established decay scheme of 27 S. ConclusionsThe precise mass excess of 27 P, the energy and the ratio between γ and proton partial widths of the 3/2 + resonance were obtained, thereby determining the 26 Si(p, γ) 27 P reaction rate based mainly on experimental constraints. The first experimental evidence for the observation of mirror asymmetries for the transitions in the decays of 27 S and 27 Na is also provided. The shell-model calculations with the Hamiltonians including the modifications on single-particle energies and two-body matrix elements related to the proton 1s 1/2 orbit give a better description of the spectroscopic properties.

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Section: Introductionmentioning

confidence: 99%

Beta-decay spectroscopy of $^{27}$S

Sun,

Xu,

Hou

et al. 2018

Preprint

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“…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.…”

Section: Introductionmentioning

confidence: 99%

β -decay spectroscopy of S27

Sun¹,

Xu²,

Lin³

et al. 2019

Phys. Rev. C

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Background: β-decay spectroscopy provides valuable information on exotic nuclei and a stringent test for nuclear theories beyond the stability line. Purpose: To search for new β-delayed protons and γ rays of 25 Si to investigate the properties of 25 Al excited states. Method: 25 Si β decays were measured by using the Gaseous Detector with Germanium Tagging system at the National Superconducting Cyclotron Laboratory. The protons and γ rays emitted in the decay were detected simultaneously. A Monte Carlo method was used to model the Doppler broadening of 24 Mg γ-ray lines caused by nuclear recoil from proton emission. Shell-model calculations using two newly-developed sd-shell Hamiltonians, USDC and USDI, were performed. Results: The most precise 25 Si half-life to date has been determined. A new proton branch at 724(4) keV and new proton-γ-ray coincidences have been identified. Three 24 Mg γ-ray lines and eight 25 Al γ-ray lines are observed for the first time in 25 Si decay. The first measurement of the 25 Si β-delayed γ ray intensities through the 25 Al unbound states is reported. All the bound states of 25 Al are observed to be populated in the β decay of 25 Si. Several inconsistencies between the previous measurements have been resolved, and new information on the 25 Al level scheme is provided. An enhanced decay scheme has been constructed and compared to the mirror decay of 25 Na and the shell-model calculations. Conclusions: The measured excitation energies, γ-ray and proton branchings, log f t values, and Gamow-Teller transition strengths for the states of 25 Al populated in the β decay of 25 Si are in good agreement with the shell model calculations, offering gratifyingly consistent insights into the fine nuclear structure of 25 Al.

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“…随着RIBLL1性能的逐渐提升, 轻核区远离β稳定线核束的产生成为可能. 在前期研究晕核结构 [8,9] 、激发态双质子发射 [10~17] 和双α发射 [18,19] 等工作的基础上, 我们发展了连续束注入-衰变方法, 从2011年 [30] , 27-29 S [31,32] 和 36,37 Ca [33] 等10余个核(图1). 本文将对实验方法、国际研究现状和国内基于RIBLL1的实验结果等作一个简要回顾.…”

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