Low-energy 
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-delayed proton decay and 
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 destruction in novae

Friedman, M.; Budner, Tamas; Pérez–Loureiro, D.; Pollacco, E.; Wrede, C.; José, J.; Brown, B. A.; Cortesi, M.; Fry, C.; Glassman, Brent; Heideman, J.; Janasik, Molly; Roosa, Mark W.; Stomps, Jordan; Surbrook, J.; Tiwari, P. C.

doi:10.1103/physrevc.101.052802

Cited by 16 publications

(9 citation statements)

References 63 publications

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“…By fitting unbroadened β-delayed γ-ray peaks with the EMG function Eq. (1) at energies of 451.7(5), 493.3 (7), 944.9(5), and 1612.4(5) keV ( 25 Si(βγ) 25 Al) [42] and 450.70 (15), 1599(2), 2908(3), and 7801(2) keV ( 23 Al(βγ) 23 Mg) [54] measured using the same detection setup in a subsequent experiment in the same campaign [55], the parameters τ and σ were characterized as a function of energy for each SeGA detector. Every detector has a different contribution to the total number of counts in the peak depending on its detection efficiency, and the simulation accounts for this by normalizing the number of counts simulated for each detector.…”

Section: Doppler Broadening Analysismentioning

confidence: 93%

“…The geometry of our experimental setup and the beam spatial distribution were used as inputs for a geant4 [45,46] Monte Carlo simulation to de-termine a γ-ray photopeak efficiency curve for the SeGA detectors. We verified the simulated efficiency curve by using a 152 Eu calibration source between 122 keV and 1408 keV and 23 Al data [55] up to 7801 keV. Although the 152 Eu source was absolutely calibrated, our procedure for determining the absolute intensities of the γ rays only requires relative efficiencies.…”

Section: Normalizationmentioning

confidence: 94%

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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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Section: Doppler Broadening Analysismentioning

confidence: 93%

Section: Normalizationmentioning

confidence: 94%

β -decay spectroscopy of S27

Sun¹,

Xu²,

Lin³

et al. 2019

Phys. Rev. C

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“…This has been achieved using the same techniques applied to X-ray burst reactions for unstable nuclei (see above and e.g. [448,449,413,450,451,452,453]), and the same techniques applied to stellar-burning reactions (Section 2, e.g. [107]).…”

Section: How Did We Get Here?mentioning

confidence: 99%

Horizons: Nuclear Astrophysics in the 2020s and Beyond

Schatz,

Reyes,

Best

et al. 2022

Preprint

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Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the chemical elements. This white paper summarizes progress and status of the field, the new open questions that have emerged, and the tremendous scientific opportunities that have opened up with major advances in capabilities across an ever growing number of disciplines and subfields that need to be integrated. We take a holistic view of the field discussing the unique challenges and opportunities in nuclear astrophysics in regards to science, diversity, education, and the interdisciplinarity and breadth of the field. Clearly nuclear astrophysics is a dynamic field with a bright future that is entering a new era of discovery opportunities.

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“…The Gaseous Detector with Germanium Tagging (GADGET) at FRIB was designed to address these issues by depositing the beta decay parent into a gaseous TPC (which is nearly transparent to the beta particles) [31] and surrounding it with an array of high-purity germanium detectors (to detect particle-gamma coincidences from the population of excited final states [20]. GADGET has operated for several years in its first phase using a coarse-grained MPGD with 13 pads as a calorimeter to measure weak, low-energy (200-300 keV) proton branches, of relevance to nucleosynthesis in classical nova explosions [32,33]. In order to study a special case of multi-particle emission of relevance to Type I X-ray bursts on accreting neutron stars [34,35], GADGET has recently been upgraded to operate in its second phase as a TPC with a higher granularity MPGD with 1024 pads and GET electronics.…”

Section: The Gaseous Detector With Germanium Tagging (Gadget)mentioning

confidence: 99%