β -particle energy-summing correction for β -delayed proton emission measurements

Meisel, Z.; Santo, M. Del; Crawford, H. L.; Cyburt, Richard H.; Grinyer, G. F.; Langer, C.; Montes, F.; Schatz, H.; Smith, K.

doi:10.1016/j.nima.2016.11.019

Cited by 10 publications

(7 citation statements)

References 29 publications

(86 reference statements)

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“…These negligible differences associated with variations on nuclides can be understood by considering the remarkably similar implantation distributions shown in Fig. 1, as well as the fact that β summing on proton energy has been demonstrated to be relatively insensitive to the β-decay Q values [73].…”

Section: A Proton Energy and Efficiency Calibrationmentioning

confidence: 83%

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: A Proton Energy and Efficiency Calibrationmentioning

confidence: 83%

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

Sun,

Xu,

Hou

et al. 2018

Preprint

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“…These negligible differences associated with variations on nuclides can be understood by considering the remarkably similar implantation distributions shown in Fig. 4, as well as the fact that β summing on proton energy has been demonstrated to be relatively insensitive to the β-decay Q values [75]. For both 25 Si and 27 S, the decay energy measured by the DSSD is a combination of the proton energy, the recoil energy of the heavy ion induced by the emitted proton, and the energy loss of the β particle deposited in the detector.…”

Section: B Proton Energy and Efficiency Calibrationmentioning

confidence: 85%

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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“…However, we apply Occam's razor and report values obtained with the simpler doublet model which provides a well-constrained energy for the lowest-energy peak in the β-delayed proton spectrum of 73 Sr. From this analysis the resulting proton separation energy of 73 Rb using the doublet model, after applying a β-summing correction (110 ± 15 keV) found from GEANT4 simulations of the detector setup [31] as well as LISE++ simulations of the implant depth distribution and accounting for the defect in measuring the recoil nucleus' energy [23], is determined to be S(p) = −640 (40) keV. Since the posterior probability for the low energy peak approximately reduced to a Gaussian, the error reported is 1σ of an approximate Gaussian added in quadrature with the β-summing uncertainty.…”

Section: A Proton Separation Energy Of 73 Rbmentioning

confidence: 99%

Influence of Rb73 on the ashes of accreting neutron stars

et al. 2020

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We find that the proton separation energy, S(p), of 73 Rb is −640(40) keV, deduced from the observation of β-delayed ground-state protons following the decay of 73 Sr. This lower-limit determination of the proton separation energy of 73 Rb coupled with previous upper limits from nonobservation, provides a full constraint on the mass excess with M( 73 Rb) =−46.01 ± 0.04 MeV. With this new mass excess and the excitation energy of the J π = 5/2 − isobaric-analog state (T = 3/2) in 73 Rb, an improved constraint can be put on the mass excess of 73 Sr using the isobaric-multiplet mass equation (IMME), and we find M( 73 Sr) =−31.98 ± 0.37 MeV. These new data were then used to study the composition of ashes on accreting neutron stars following Type I xray bursts. Counterintuitively, we find that there should be an enhanced fraction of A > 102 nuclei with more negative proton separation energies at the 72 Kr rp-process waiting point. Larger impurities of heavier nuclei in the ashes of accreting neutron stars will impact the cooling models for such astrophysical scenarios.

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β -particle energy-summing correction for β -delayed proton emission measurements

Cited by 10 publications

References 29 publications

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

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

β -decay spectroscopy of S27

Influence of Rb73 on the ashes of accreting neutron stars

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