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

Abstract

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 is insufficient to constrain the properties of the key resonance in ${}^{26}$Si$(p,\gamma {)}^{27}$P reaction rate and probe the possible isospin asymmetry. The decay scheme of ${}^{27}$S is complicated and far from being understood, which has motivated but also presented 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 $\beta$-delayed protons and $\gamma$ rays were measured simultaneously. Results: The improved spectroscopic properties including the precise half-life of ${}^{27}$S, the excitation energies, $\beta$-decay branching ratios, log~$ft$ values, and $B$(GT) values for the states of ${}^{27}$P populated in the $\beta$ decay of ${}^{27}$S were measured and compared to the ${}^{27}$Mg mirror states and the shell-model calculations. The present work has expanded greatly on the previously established decay scheme of ${}^{27}$S. Conclusions: The precise proton-separation energy of ${}^{27}$P, the energy and the ratio between $\gamma$ and proton partial widths of the $3/2^{+}$ resonance were obtained, thereby determining the ${}^{26}$Si$(p,\gamma {)}^{27}$P reaction rate based mainly on experimental constraints. The first evidence for the observation of a large isospin asymmetry for the mirror decays of ${}^{27}$S and ${}^{27}$Na is also provided. The experimental spectroscopic information can be reproduced by the shell-model calculation taking the weakly bound effect of the proton $1s_{1/2}$ orbit into account.

References in corpus (33)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Radioactive 26Al and massive stars in the Galaxy
• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• Radioactive decays at limits of nuclear stability
• Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions
• Superallowed 0+ --> 0+ nuclear beta decays: 2014 critical survey, with precise results for Vud and CKM unitarity
• An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
• STARLIB: A Next-Generation Reaction-Rate Library for Nuclear Astrophysics
• Nuclear uncertainties in the NeNa-MgAl cycles and production of 22Na and 26Al during nova outbursts
• Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
• Relevant energy ranges for astrophysical reaction rates
• Nucleosynthesis in Type I X-ray Bursts
• Comparative tests of isospin-symmetry-breaking corrections to superallowed 0+-to-0+ nuclear beta decay
• Beta-decay properties of ${}^{25}$Si and ${}^{26}$P
• Spectral and intensity variations of Galactic 26^Al emission
• Dependence of X-ray Burst Models on Nuclear Masses
• Isospin Non-Conservation in $sd$-Shell Nuclei
• Classical-Nova Contribution to the Milky Way's ${}^{26}$Al Abundance: Exit Channel of the Key ${}^{25}$Al($p,\gamma$)${}^{26}$Si Resonance
• Mirror energy difference and the structure of loosely bound proton-rich nuclei around A = 20
• The cluster-core model for halo-structure of light nuclei at the drip lines
• Beta-delayed gamma decay of 26P: Possible evidence of a proton halo
• Beta-delayed proton emission from ${}^{21}$Mg
• The beta-decay of 22Al
• Isospin-symmetry breaking in superallowed Fermi beta-decay due to isospin-nonconserving forces
• Reaction rates of ${}^{64}$Ge($p,\gamma$)${}^{65}$As and ${}^{65}$As($p,\gamma$)${}^{66}$Se and the extent of nucleosynthesis in type I X-ray bursts
• Beta-decay study of $T_z=-2$ proton-rich nucleus ${}^{20}$Mg
• Relative proton and gamma widths of astrophysically important states in 30S studied in the beta-decay of 31Ar
• The Masses of the $T_z=-3/2$ Nuclei ${}^{27}$P and ${}^{29}$S
• Observation of Doppler broadening in $\beta$-delayed proton-$\gamma$ decay
• Doppler Broadening in ${}^{20}$Mg($\beta p\gamma$)${}^{19}$Ne Decay
• Development of large-area quadrant silicon detector for charged particles
• $\beta$-particle energy-summing correction for $\beta$-delayed proton emission measurements

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• Experimentally well-constrained masses of ${}^{27}$P and ${}^{27}$S: Implications for studies of explosive binary systems
• Recent progress in configuration-interaction shell model
• Simultaneous measurement of beta-delayed proton and gamma emission of ${}^{26}$P for ${}^{25}$Al($p,\gamma$)${}^{26}$Si reaction rate
• Mass measurements for $T_z=-2$ $fp$-shell nuclei ${}^{40}$Ti, ${}^{44}$Cr, ${}^{46}$Mn, ${}^{48}$Fe, ${}^{50}$Co and ${}^{52}$Ni
• Spectroscopy and lifetime measurements near the proton drip line: ${}^{26,27,28}$P
• ${}^{25}$Si ${\beta }^{+}$-decay spectroscopy
• New 26P(p,γ)27S thermonuclear reaction rate and its astrophysical implication in rp-process
• AMC 12 atomic mass compilation data extrapolated for atomic masses of nuclei far from the valley of stability
• The 2025 Evaluation of Experimental Thermonuclear Reaction Rates (ETR25)