Correlations of two protons emitted from excited states of 28S and 27P

Xu, X. X.; Lin, C. J.; Jia, H. M.; Feng, Yan; Zhang, H.Q.; Liu, Z.H.; Wu, Zihao; Yang, L.; Bao, Peng; Sun, L. J.; Xu, H. S.; Wang, J.S.; Yang, Y.; Sun, Zhi Yu; Hu, Z.; Wang, M.; Jin, S.; Han, J. L.; Zhang, N.T.; Chen, S.Z.; Lei, Xiang; Huang, M.; Ma, P.; Ma, J.B.; Zhang, Y.H.; Zhou, X. H.; Ma, Xuan; Xiao, G. Q.

doi:10.1016/j.physletb.2013.10.029

Cited by 26 publications

(20 citation statements)

References 29 publications

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“…Besides, the excitation energy of the 5/2 + second excited state in 27 P was deduced to be 1569 (12) keV using the relation: E * ( 27 P 5/2 + ) = S p ( 27 P) + E p2 ( 27 P 5/2 + ). This value is more precise than and consistent with those of 1592 (62) keV [38] and 1525 (43) keV [15], while is slightly lower than those of 1660 (40) keV [91], 1615 (21) keV [31], and 1666 (42) keV [36]. The 5/2 + second excited state was also predicted to have a five orders of magnitude larger protondecay branch than γ-decay branch [87].…”

Section: B Decay Schemesupporting

confidence: 62%

“…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%

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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: B Decay Schemesupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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

Sun,

Xu,

Hou

et al. 2018

Preprint

Self Cite

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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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“…With their good energy resolution, fast time response and reliable stability, silicon detectors have been applied to energy spectrum measurement, time signal pickup, and particle identification as well as tracking systems, such as the use in the completekinematics measurement of two-proton emission from extremely proton-rich nuclei [5][6][7], Silicon Ball for the research on the weakly bound nuclei close to particle drip line [8], and MUST/MUST2 [9,10] for radioactive beam experiments. Among them, Passivated Implanted Planar Silicon (PIPS) detectors fabricated in the "Planar" process [11,12] have enjoyed widespread adoption.…”

Section: Introductionmentioning

confidence: 99%

Development of large-area quadrant silicon detector for charged particles

Bao¹,

Lin²,

Feng³

et al. 2014

Chinese Phys. C

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The quadrant silicon detector, a kind of passivated implanted planar silicon detector with quadrant structure on the junction side, gained its wide application in charged particle detection. In this paper, the manufacturing procedure, performance test and results of the quadrant silicon detector developed recently at the China Institute of Atomic Energy are presented. The detector is about 300 µm thick with a 48×48 mm 2 active area. The leakage current under full depletion bias voltage of -16 V is about 2.5 nA, and the raising time is better than 160 ns. The energy resolution for 5.157 MeV α-particle is around the level of 1%. Charge sharing effects between the neighboring quads, leading to complicated correlations between two quads, were observed when α particles illuminated on the junction side. It is explained as a result of distortion of electric field of inter-quad region. Such events is only about 0.6% of all events and can be neglected in an actual application.

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Correlations of two protons emitted from excited states of 28S and 27P

Cited by 26 publications

References 29 publications

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

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

β -decay spectroscopy of S27

Development of large-area quadrant silicon detector for charged particles

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