Isobaric beam purification for high precision Penning trap mass spectrometry of radioactive isotope beams with SWIFT

Kwiatkowski, A. A.; Bollen, G.; Redshaw, Matthew; Ringle, R.; Schwarz, S.

doi:10.1016/j.ijms.2014.09.016

Cited by 22 publications

(12 citation statements)

References 26 publications

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“…After their capture, the ions were purified, using both dipole cleaning [26] and the stored waveform inverse Fourier transform (SWIFT) technique [27]. Both techniques excite contaminant ions using azimuthal RF dipole fields at their reduced cyclotron frequency, ν + , driving them to a large enough radius such that they do not interfere with the measurement.…”

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confidence: 99%

High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow

et al. 2018

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We report the mass measurement of ^{56}Cu, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of ^{56}Cu is critical for constraining the reaction rates of the ^{55}Ni(p,γ) ^{56}Cu(p,γ) ^{57}Zn(β^{+}) ^{57}Cu bypass around the ^{56}Ni waiting point. Previous recommended mass excess values have disagreed by several hundred keV. Our new value, ME=-38626.7(7.1) keV, is a factor of 30 more precise than the extrapolated value suggested in the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)CPCHCQ1674-113710.1088/1674-1137/36/12/003], and more than a factor of 12 more precise than values calculated using local mass extrapolations, while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C 41, 030003 (2017)CPCHCQ1674-113710.1088/1674-1137/41/3/030003]. The new experimental average, using our new mass and the value from AME2016, is used to calculate the astrophysical ^{55}Ni(p,γ) and ^{56}Cu(p,γ) forward and reverse rates and perform reaction network calculations of the rp process. These show that the rp-process flow redirects around the ^{56}Ni waiting point through the ^{55}Ni(p,γ) route, allowing it to proceed to higher masses more quickly and resulting in a reduction in ashes around this waiting point and an enhancement to higher-mass ashes.

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High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow

et al. 2018

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“…The ions are then ejected into the 9.4 T Penning Trap. Once trapped, the ions were first purified using narrow-band and SWIFT rf dipole excitations [36,37] via segmented ring electrodes on the trap to remove contaminant ions. The Time-of-Flight Ion Cyclotron Resonance (TOF-ICR) technique was used measure the cyclotron frequency, ν c = qB/(2π • m), of an ion of interest of mass m and charge q in a magnetic field B [38,39].…”

Section: Experimental Methodsmentioning

confidence: 99%

High precision mass measurements of the isomeric and ground states of $^{44}$V: improving constraints on the IMME parameters of the A=44, $\text{0}^{\text{+}}$ quintet

Puentes,

Bollen,

Brodeur

et al. 2020

Preprint

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Background: The quadratic Isobaric Multiplet Mass Equation (IMME) has been very successful at predicting the masses of isobaric analogue states in the same multiplet, while its coefficients are known to follow specific trends as functions of mass number. The Atomic Mass Evaluation 2016 [Chin. Phys. C 41, 030003 (2017)] 44 V mass value results in an anomalous negative c coefficient for the IMME quadratic term; a consequence of large uncertainty and an unresolved isomeric state. The b and c coefficients can provide useful constraints for construction of the isospin-nonconserving (INC) Hamiltonians for the pf shell. In addition, the excitation energy of the 0 + , T = 2 level in 44 V is currently unknown. This state can be used to constrain the mass of the more exotic 44 Cr.Purpose: The aim of the experimental campaign was to perform high-precision mass measurements to resolve the difference between 44 V isomeric and ground states, to test the IMME using the new ground state mass value and to provide necessary ingredients for the future identification of the 0 + , T = 2 state in 44 V.Method: High-precision Penning trap mass spectrometry was performed at LEBIT, located at the National Superconducting Cyclotron Laboratory, to measure the cyclotron frequency ratios of [ 44g,m VO] + versus [ 32 SCO] + , a well-known reference mass, to extract both the isomeric and ground state masses of 44 V. Results:The mass excess of the ground and isomeric states in 44 V were measured to be −23 804.9(80) keV/c 2 and −23 537.0(55) keV/c 2 , respectively. This yielded a new proton separation energy of Sp = 1 773(10) keV. Conclusion:The new values of the ground state and isomeric state masses of 44 V have been used to deduce the IMME b and c coefficients of the lowest 2 + and 6 + triplets in A = 44. The 2 + c coefficient is now verified with the IMME trend for lowest multiplets and is in good agreement with the shell-model predictions using charge-dependent Hamiltonians. The mirror energy differences were determined between 44 V and 44 Sc, in line with isospin-symmetry for this multiplet. The new value of the proton separation energy determined, to an uncertainty of 10 keV, will be important for the determination of the 0 + , T = 2 state in 44 V and, consequently, for prediction of the mass excess of 44 Cr.

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“…Ions were injected off-axis using a Lorentz steerer [32] to prepare them with an initial magnetron orbit. During trapping, additional purification of isobaric contaminants was achieved using the targeted dipole radiofrequency (RF) excitation technique as well as the stored waveform inverse Fourier transform (SWIFT) method [33][34][35].…”

Section: Penning Trap Mass Measurementsmentioning

confidence: 99%

Improved Nuclear Physics Near $A=61$ Refines Urca Neutrino Luminosities in Accreted Neutron Star Crusts

Meisel,

Hamaker,

Bollen

et al. 2021

Preprint

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We performed a Penning trap mass measurement of 61 Zn at the National Superconducting Cyclotron Laboratory and NuShellX calculations of the 61 Zn and 62 Ga structure using the GXPF1A Hamiltonian to obtain improved estimates of the 61 Zn(p, γ) 62 Ga and 60 Cu(p, γ) 61 Zn reaction rates. Surveying astrophysical conditions for type-I X-ray bursts with the code MESA, implementing our improved reaction rates, and taking into account updated nuclear masses for 61 V and 61 Cr from the recent literature, we refine the neutrino luminosity from the important mass number A = 61 urca cooling source in accreted neutron star crusts. This improves our understanding of the thermal barrier between deep heating in the crust and the shallow depths where extra heat is needed to explain X-ray superbursts, as well as the expected signature of crust urca neutrino emission in light curves of cooling transients.

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Isobaric beam purification for high precision Penning trap mass spectrometry of radioactive isotope beams with SWIFT

Cited by 22 publications

References 26 publications

High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow

High-Precision Mass Measurement of Cu56 and the Redirection of the rp -Process Flow

High precision mass measurements of the isomeric and ground states of $^{44}$V: improving constraints on the IMME parameters of the A=44, $\text{0}^{\text{+}}$ quintet

Improved Nuclear Physics Near $A=61$ Refines Urca Neutrino Luminosities in Accreted Neutron Star Crusts

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