0000000000393992

AUTHOR

C. Aa. Diget

showing 9 related works from this author

New information on 12C states from the decays of 12N and 12B

2003

Abstract The properties of states in 12 C above the 3α-threshold are of high current interest for nuclear astrophysics and for the nuclear many-body problem in general. We have initiated a series of experiments aimed at elucidating this region by using the β-decays of 12 N and 12 B. By applying the ISOL method for producing these radioactive isotopes, in combination with modern segmented charged particle detectors, our approach has significant advantages over previous studies of this region.

PhysicsMany-body problemNuclear physicsNuclear and High Energy PhysicsParticle physicsIsotopeNuclear astrophysicsNuclear structureCarbon-12Nuclear ExperimentIsotopes of berylliumRadioactive decayParticle detectorNuclear Physics A
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News on 12C from beta-decay studies

2004

We discuss the importance of the spectroscopic properties of the resonances of 12C just above the 3α-threshold, and review the existing experimental information of this region with emphasis on O+ and 2+ states. A new experimental approach for studying the β-decays of 12B and 12N is presented based on techniques developed in the context of Radioactive beam (rare isotope) physics. Finally preliminary results from an ongoing analysis of two recent experiments are given. © 2004 Published by Elsevier B.V.

Nuclear physicsPhysicsNuclear and High Energy PhysicsContext (language use)Radioactive beam
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R-matrix analysis of theβdecays ofN12andB12

2010

The β decays of 12N and 12B have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0+ and 2+ strengths in the triple-α continuum. For the first time a complete treatment of 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0+ and 2+ state is needed to reproduce the spectra. Broad 03+ and 22+ states are found between 10.5 and 12 MeV in this work. The presence of β strength up to the 12…

Nuclear physicsPhysicsNuclear and High Energy PhysicsExcited stateDouble beta decayCarbon-12Isotopes of boronAlpha particleAtomic physicsRadioactive decaySpectral lineR-matrixPhysical Review C
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The β-decay approach for studying 12C

2008

6 pags., 3 figs. -- 9th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (CLUSTERS'07) 3–7 September 2007, Stratford upon Avon, UK

HistoryChemistryDetectorCoincidenceComputer Science ApplicationsEducationNuclear physicsmedicine.anatomical_structuremedicineMirror nucleiAtomic physicsSpin (physics)NucleusEnergy (signal processing)Journal of Physics: Conference Series
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Precise branching ratios to unbound 12C states from 12N and 12B β-decays

2009

6 pages, 2 tables, 4 figures.--PACS nrs.: 21.45.-v; 23.40.-s; 27.20.+n; 21.60.De.--Printed version published Aug 3, 2009

branching ratiosPhysicsNuclear and High Energy PhysicsChiral perturbation theory[PACS] β decayBranching fractionNuclear shell model[PACS] Ab initio methods[PACS] β decay; double β decay; electron and muon captureAlpha particleFew-body systems[PACS] Few-body systemselectron and muon capturedouble β decay6 ≤ A ≤ 19 [[PACS] Properties of specific nuclei listed by mass ranges]Double beta decayExcited stateAtomic physics[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19Nucleonbeta-decayC12
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Beta-decay properties of the neutron-rich $^{94-99}$Kr and $^{142-147}$Xe isotopes

2002

Beta-decay half-lives and delayed-neutron emission probabilities of the neutron-rich noble-gas isotopes Kr94-99 and Xe142-147 have been measured at the PSB-ISOLDE facility at CERN. The results are compared to QRPA shell-model predictions and are used in dynamic calculations of r-process abundances of Kr and Xe isotopes. (C) 2002 Elsevier Science B.V. All rights reserved.

PhysicsNuclear physicsNuclear and High Energy PhysicsLarge Hadron ColliderIsotopeNuclear TheoryPhysics::Accelerator PhysicsNeutronNuclear Physics - ExperimentAtomic physicsNuclear ExperimentBeta decay
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Properties of the 12C 10 MeV state determined through β-decay

2005

16 pages, 1 table, 10 figures.-- PACS nrs.: 23.40.-s; 26.20.+f; 27.20.+n.-- Printed version published Oct 3, 2005.

PhysicsNuclear and High Energy Physics[PACS] β decayDeduced spin and parity of levels in C-12[PACS] β decay; double β decay; electron and muon captureParity (physics)Alpha particleRadioactivity Be-12(β-) B-12(β(-)3α) [produced in Ta(p X)]Inelastic scatteringBeta decayelectron and muon captureParticle decayMeasured α-particle coincidencesR-matrix analysisdouble β decay6 ≤ A ≤ 19 [[PACS] Properties of specific nuclei listed by mass ranges]Double-sided Si strip detectorDouble beta decay[PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19Atomic physics[PACS] Hydrostatic stellar nucleosynthesisExcitationCoincidence detection in neurobiologyNuclear Physics A
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Branching ratios in theβdecays ofN12andB12

2009

Absolute branching ratios to unbound states in C-12 populated in the beta decays of N-12 and B-12 are reported. Clean sources of N-12 and B-12 were obtained using the isotope separation on-line (ISOL) method. The relative branching ratios to the different populated states were extracted using single-alpha as well as complete kinematics triple-alpha spectra. These two largely independent methods give consistent results. Absolute normalization is achieved via the precisely known absolute branching ratio to the bound 4.44 MeV state in C-12. The extracted branching ratios to the unbound states are a factor of three more precise than previous measurements. Branching ratios in the decay of Na-20 …

Nuclear physicsPhysicsNormalization (statistics)Nuclear and High Energy PhysicsBranching fractionlawDouble beta decayCarbon-12Alpha particleBeta decaySpectral lineIsotope separationlaw.inventionPhysical Review C
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Breakup channels forC12triple-αcontinuum states

2009

The triple-alpha-particle breakup of states in the triple-alpha continuum of C-12 has been investigated by way of coincident detection of all three alpha particles of the breakup. The states have been fed in the beta decay of N-12 and B-12, and the alpha particles measured using a setup that covers all of the triple-alpha phase space. Contributions from the breakup through the Be-8(0(+)) ground state as well as other channels-interpreted as breakup through excited energies in Be-8-have been identified. Spins and parities of C-12 triple-alpha continuum states are deduced from the measured phase-space distributions for breakup through Be-8 above the ground state by comparison to a fully symme…

PhysicsNuclear and High Energy PhysicsAngular momentumExcited stateNuclear TheoryContinuum (design consultancy)Carbon-12Alpha particleAtomic physicsNuclear ExperimentSpin (physics)Ground stateBreakupPhysical Review C
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