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1. Mass measurements beyond the major r-process waiting point 80Zn

Author

Baruah, S., Audi, G., Blaum, K., Dworschak, M., George, S., Guenaut, C., Hager, U., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H. -J., Lunney, D., Schatz, H., Schweikhard, L., and Yazidjian, C.

Subjects
Nuclear Experiment
Abstract

High-precision mass measurements on neutron-rich zinc isotopes 71m,72-81Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time the mass of 81Zn has been experimentally determined. This makes 80Zn the first of the few major waiting points along the path of the astrophysical rapid neutron capture process where neutron separation energy and neutron capture Q-value are determined experimentally. As a consequence, the astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N = 50 shell closure for Z = 30 farther from stability., Comment: 4 pages, 3 figures

Published
2008
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2. Electric and magnetic field optimization procedure for Penning trap mass spectrometers

Author

Beck, D., Blaum, K., Bollen, G., Delahaye, P., George, S., Guenaut, C., Herfurth, F., Herlert, A., Lunney, D., Schweikhard, L., and Yazidjian, C.

Subjects
Physics - Instrumentation and Detectors, Physics - Atomic Physics
Abstract

Significant systematic errors in high-precision Penning trap mass spectrometry can result from electric and magnetic field imperfections. An experimental procedure to minimize these uncertainties is presented for the on-line Penning trap mass spectrometer ISOLTRAP, located at ISOLDE/CERN. The deviations from the ideal magnetic and electric fields are probed by measuring the cyclotron frequency and the reduced cyclotron frequency, respectively, of stored ions as a function of the time between the ejection of ions from the preparation trap and their capture in the precision trap, which influences the energy of their axial motion. The correction parameters are adjusted to minimize the frequency shifts., Comment: 25 pages, 9 figures

Published
2008
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3. Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

Author

George, S., Audi, G., Blank, B., Blaum, K., Breitenfeldt, M., Hager, U., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H. -J., Kretzschmar, M., Lunney, D., Savreux, R., Schwarz, S., Schweikhard, L., and Yazidjian, C.

Subjects
Nuclear Experiment
Abstract

High-precision Penning trap mass measurements on the stable nuclide 27Al as well as on the short-lived radionuclides 26Al and 38,39Ca have been performed by use of radiofrequency excitation with time-separated oscillatory fields, i.e. Ramsey's method, as recently introduced for the excitation of the ion motion in a Penning trap, was applied. A comparison with the conventional method of a single continuous excitation demonstrates its advantage of up to ten times shorter measurements. The new mass values of 26,27Al clarify conflicting data in this specific mass region. In addition, the resulting mass values of the superallowed beta-emitter 38Ca as well as of the groundstate of the beta-emitter 26Al m confirm previous measurements and corresponding theoretical corrections of the ft-values., Comment: 7 pages, 9 figures

Published
2008
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4. Evidence for a breakdown of the Isobaric Multiplet Mass Equation: A study of the A=35, T=3/2 isospin quartet

Author

Yazidjian, C., Audi, G., Beck, D., Blaum, K., George, S., Guenaut, C., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H. -J., Lunney, D., and Schweikhard, L.

Subjects
Nuclear Experiment
Abstract

Mass measurements on radionuclides along the potassium isotope chain have been performed with the ISOLTRAP Penning trap mass spectrometer. For 35K T1/2=178ms) to 46K (T1/2=105s) relative mass uncertainties of 2x10-8 and better have been achieved. The accurate mass determination of 35K (dm=0.54keV) has been exploited to test the Isobaric Multiplet Mass Equation (IMME) for the A=35, T=3/2 isospinquartet. The experimental results indicate a deviation from the generally adopted quadratic form., Comment: 8 pages, 4 figures

Published
2007
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5. The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results

Author

George, S., Blaum, K., Herfurth, F., Herlert, A., Kretzschmar, M., Nagy, S., Schwarz, S., Schweikhard, L., and Yazidjian, C.

Subjects
Physics - Atomic Physics, Physics - General Physics
Abstract

The highest precision in direct mass measurements is obtained with Penning trap mass spectrometry. Most experiments use the interconversion of the magnetron and cyclotron motional modes of the stored ion due to excitation by external radiofrequency-quadrupole fields. In this work a new excitation scheme, Ramsey's method of time-separated oscillatory fields, has been successfully tested. It has been shown to reduce significantly the uncertainty in the determination of the cyclotron frequency and thus of the ion mass of interest. The theoretical description of the ion motion excited with Ramsey's method in a Penning trap and subsequently the calculation of the resonance line shapes for different excitation times, pulse structures, and detunings of the quadrupole field has been carried out in a quantum mechanical framework and is discussed in detail in the preceding article in this journal by M. Kretzschmar. Here, the new excitation technique has been applied with the ISOLTRAP mass spectrometer at ISOLDE/CERN for mass measurements on stable as well as short-lived nuclides. The experimental resonances are in agreement with the theoretical predictions and a precision gain close to a factor of four was achieved compared to the use of the conventional excitation technique., Comment: 12 pages, 14 figures, 2 tables

Published
2007
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6. High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N=40

Author

Guenaut, C., Audi, G., Beck, D., Blaum, K., Bollen, G., Delahaye, P., Herfurth, F., Kellerbauer, A., Kluge, H. -J., Libert, J., Lunney, D., Schwarz, S., Schweikhard, L., and Yazidjian, C.

Subjects
Nuclear Experiment
Abstract

High-precision mass measurements of more than thirty neutron-rich nuclides around the Z=28 closed proton shell were performed with the triple-trap mass spectrometer ISOLTRAP at ISOLDE/CERN to address the question of a possible neutron shell closure at N=40. The results, for 57,60,64-69Ni (Z=28), 65-74,76Cu (Z=29), and 63-65,68-78Ga (Z=31), have a relative uncertainty of the order of 10^8. In particular, the masses of 72-74,76Cu have been measured for the first time. We analyse the resulting mass surface for signs of magicity, comparing the behavior of N=40 to that of known magic numbers and to mid-shell behavior. Contrary to nuclear spectroscopy studies, no indications of a shell or sub-shell closure are found for N=40., Comment: 14 figures

Published
2007
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7. Magnetic field stabilization for high-accuracy mass measurements on exotic nuclides

Author

Marie-Jeanne, M., Alonso, J., Blaum, K., Djekic, S., Dworschak, M., Hager, U., Herlert, A., Nagy, Sz., Savreux, R., Schweikhard, L., Stahl, S., and Yazidjian, C.

Subjects
Physics - Instrumentation and Detectors, Physics - Atomic Physics
Abstract

The magnetic-field stability of a mass spectrometer plays a crucial role in precision mass measurements. In the case of mass determination of short-lived nuclides with a Penning trap, major causes of instabilities are temperature fluctuations in the vicinity of the trap and pressure fluctuations in the liquid helium cryostat of the superconducting magnet. Thus systems for the temperature and pressure stabilization of the Penning trap mass spectrometer ISOLTRAP at the ISOLDE facility at CERN have been installed. A reduction of the fluctuations by at least one order of magnitude downto dT=+/-5mK and dp=+/-50mtorr has been achieved, which corresponds to a relative frequency change of 2.7x10^{-9} and 1.5x10^{-10}, respectively. With this stabilization the frequency determination with the Penning trap only shows a linear temporal drift over several hours on the 10 ppb level due to the finite resistance of the superconducting magnet coils., Comment: 23 pages, 13 figures

Published
2007
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8. Separated Oscillatory Fields for High-Precision Penning Trap Mass Spectrometry

Author

George, S., Baruah, S., Blank, B., Blaum, K., Breitenfeldt, M., Hager, U., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H. J., Kretzschmar, M., Lunney, D., Savreux, R., Schwarz, S., Schweikhard, L., and Yazidjian, C.

Subjects
Nuclear Experiment
Abstract

Ramsey's method of separated oscillatory fields is applied to the excitation of the cyclotron motion of short-lived ions in a Penning trap to improve the precision of their measured mass. The theoretical description of the extracted ion-cyclotron-resonance line shape is derived out and its correctness demonstrated experimentally by measuring the mass of the short-lived $^{38}$Ca nuclide with an uncertainty of $1.6\cdot 10^{-8}$ using the ISOLTRAP Penning trap mass spectrometer at CERN. The mass value of the superallowed beta-emitter $^{38}$Ca is an important contribution for testing the conserved-vector-current hypothesis of the electroweak interaction. It is shown that the Ramsey method applied to mass measurements yields a statistical uncertainty similar to that obtained by the conventional technique ten times faster., Comment: 5 pages, 4 figures, 0 tables

Published
2007
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13. New mass data for the rp-process above Z = 32

Author

Herfurth, F., Audi, G., Beck, D., Blaum, K., Bollen, G., Delahaye, P., Dworschak, M., George, S., Guénaut, C., Kellerbauer, A., Lunney, D., Mukherjee, M., Rahaman, S., Schwarz, S., Schweikhard, L., Weber, C., and Yazidjian, C.

Published
2011
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14. Mass measurements and evaluation around A = 22

Author

Mukherjee, M., Beck, D., Blaum, K., Bollen, G., Delahaye, P., Dilling, J., George, S., Guénaut, C., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H. -J., Köster, U., Lunney, D., Schwarz, S., Schweikhard, L., and Yazidjian, C.

Published
2008
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19. Is N = 40 magic? An analysis of ISOLTRAP mass measurements

Author

Guénaut, C., Audi, G., Beck, D., Blaum, K., Bollen, G., Delahaye, P., Herfurth, F., Kellerbauer, A., Kluge, H. -J., Lunney, D., Schwarz, S., Schweikhard, L., Yazidjian, C., Gross, Carl J., editor, Nazarewicz, Witold, editor, and Rykaczewski, Krzysztof P., editor

Published
2005
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22. Mass measurements beyond the major r-process waiting point $^{80}$Zn

Author

Baruah, S., Audi, G., Blaum, K., Dworschak, M., George, S., Guénaut, C., Hager, U., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H.-J., Lunney, D., Schatz, H., Schweikhard, L., Yazidjian, C., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Binding energies and masses, supernovae, Nucleosynthesis in novae, and other explosive environments, FOS: Physical sciences, Nuclear Physics - Experiment, 59<=A<=89, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

High-precision mass measurements on neutron-rich zinc isotopes 71m,72-81Zn have been performed with the Penning trap mass spectrometer ISOLTRAP. For the first time the mass of 81Zn has been experimentally determined. This makes 80Zn the first of the few major waiting points along the path of the astrophysical rapid neutron capture process where neutron separation energy and neutron capture Q-value are determined experimentally. As a consequence, the astrophysical conditions required for this waiting point and its associated abundance signatures to occur in r-process models can now be mapped precisely. The measurements also confirm the robustness of the N = 50 shell closure for Z = 30 farther from stability., 4 pages, 3 figures

Published
2008
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23. Masses and charge radii of 17-22Ne and the two-proton-halo candidate 17Ne

Author

Geithner, W, Neff, T, Audi, G, Blaum, K, Delahaye, P, Feldmeier, H, George, S, Guénaut, C, Herfurth, F, Herlert, A, Kappertz, S, Keim, M, Kellerbauer, A G, Kluge, H J, Kowalska, M, Lievens, P, Lunney, D, Marinova, K, Neugart, R, Schweikhard, L, Wilbert, S, and Yazidjian, C

Subjects
Nuclear Physics - Experiment
Abstract

High-precision mass and charge radius measurements on ;{17-22}Ne, including the proton-halo candidate 17Ne, have been performed with Penning trap mass spectrometry and collinear laser spectroscopy. The 17Ne mass uncertainty is improved by factor 50, and the charge radii of ;{17-19}Ne are determined for the first time. The fermionic molecular dynamics model explains the pronounced changes in the ground-state structure. It attributes the large charge radius of 17Ne to an extended proton configuration with an s;{2} component of about 40%. In 18Ne the smaller radius is due to a significantly smaller s;{2} component. The radii increase again for ;{19-22}Ne due to cluster admixtures.

Published
2008

24. Masses and Charge Radii of Ne17-22 and the Two-Proton-Halo Candidate Ne-17

Author

Geithner, W., Neff, T., Audi, G., Blaum, K., Delahaye, P., Feldmeier, H., George, S., Guenaut, C., Herfurth, F., Herlert, A., Kappertz, S., Keim, M., Kellerbauer, A., Kluge, H.-J., Kowalska, M., Lievens, P., Lunney, D., Marinova, K., Neugart, R., Schweikhard, L., Wilbert, S., Yazidjian, C., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
GROUND-STATE, HALO, ISOTOPES, N-17, NUCLEAR, BETA-DECAY, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

High-precision mass and charge radius measurements on Ne17-22, including the proton-halo candidate Ne-17, have been performed with Penning trap mass spectrometry and collinear laser spectroscopy. The Ne-17 mass uncertainty is improved by factor 50, and the charge radii of Ne17-19 are determined for the first time. The fermionic molecular dynamics model explains the pronounced changes in the ground-state structure. It attributes the large charge radius of Ne-17 to an extended proton configuration with an s(2) component of about 40%. In Ne-18 the smaller radius is due to a significantly smaller s(2) component. The radii increase again for Ne19-22 due to cluster admixtures.

Published
2008
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25. Restoration of the N=82 Shell Gap from Direct Mass Measurements of $^{132,134}$Sn

Author

Dworschak, M., Audi, G., Blaum, K., Delahaye, P., George, S., Hager, U., Herfurth, F., Herlert, A., Kellerbauer, A., J. Kluge, H., Lunney, D., Schweikhard, L., Yazidjian, C., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
NUCLEI, ACCURACY, Nuclear Theory, PENNING TRAP, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ISOLTRAP, FORMULAS, Physics::Atomic and Molecular Clusters, ISOTOPES, SPECTROMETER, Nuclear Physics - Experiment, Nuclear Experiment, SYSTEM, SN-132, STARS
Abstract

A high-precision direct Penning trap mass measurement has revealed a 0.5-MeV deviation of the binding energy of $^{134}$Sn from the currently accepted value. The corrected mass assignment of this neutron-rich nuclide restores the neutron-shell gap at N=82, previously considered to be a case of “shell quenching.” In fact, the new shell gap value for the short-lived $^{132}$Sn is larger than that of the doubly-magic $^{48}$Ca which is stable. The N=82 shell gap has considerable impact on fission recycling during the $r$ process. More generally, the new finding has important consequences for microscopic mean-field theories which systematically deviate from the measured binding energies of closed-shell nuclides.

Published
2008
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26. Isoltrap mass measurements of exotic nuclides at $\deltam/m=10^{-8}$

Author

Blaum, K., Audi, G., Beck, D., Bollen, G., Delahaye, P., George, S., Guénaut, C., Herfurth, F., Herlert, A., Kellerbauer, A., Kluge, H.-J., Lunney, D., Mukherjee, M., Schwarz, S., Schweikhard, L., Yazidjian, C., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), B. Jonson, M. Meister, G. Nyman, M. Zhukov, and ISOLTRAP

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The ISOLTRAP experiment at the ISOLDE facility at CERN is a Penning trap mass spectrometer for on-line mass measurements on short-lived radionuclides. It allows the determination of atomic masses of exotic nuclides with a relative uncertainty of only 10$^{−8}. The results provide important information for, e.g., weak interaction studies and nuclear models. Recent ISOLTRAP investigations and applications of high-precision mass measurements are discussed.

Published
2004
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27. Study of ground- and low-lying nuclear states by combining laser ionization and Penning trap mass spectrometry

Author

Blaum, K., Beck, D., Bollen, G., Delahaye, P., Guénaut, C., Herfurth, F., Kellerbauer, A., Kluge, H.-J., Köster, U., Lunney, D., Schwarz, S., Schweikhard, L., Yazidjian, C., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The combination of resonant laser ionization, nuclear spectroscopy and mass measurements allows the deconvolution of the low-energy structure of atomic nuclei. Three $\beta$-decaying isomers of $^{70}$Cu have been unambiguously identified with the Penning trap mass spectrometer ISOLTRAP. In addition, isomerically pure ensembles of the short-lived radionuclides $^{68;70}$Cu have been prepared.

Published
2004

28. Direct Mass Measurements on the Superallowed Emitter $^{74}$Rb and its Daughter $^{74}$Kr

Author

Kellerbauer, A. G., Audi, G., Beck, D., Blaum, K., Bollen, G., Brown, B. A., Delahaye, P., Guénaut, C., Herfurth, F., Kluge, H. J., Lunney, D., Schwarz, S., Schweikhard, L., Yazidjian, C., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
21.10.Dr, 07.75.+h, 23.40.-s, 32.10.Bi, nuclear mass, standard model, spontaneous symmetry breaking, radioactive decay periods, nuclear isospin, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], beta-decay, nuclei with mass number 59 to 89
Abstract

The decay energy of the superallowed ? decay 74Rb(?+)74Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and found to be Q = 10416.8(4.5) keV. The exotic nuclide 74Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap has been carried out. Together with existing data for the partial half-life as well as theoretical corrections, the decay energy yields a comparative half-life of Ft = 3084(15) s for this decay, in agreement with the mean value for the series of the lighter nuclides from 10C to 54Co. Assuming conserved vector current, this result allows for an experimental determination of the isospin-symmetry-breaking correction ?C.

Published
2004
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29. Unambiguous identification of three β-decaying isomers in 70Cu

Author

Van Roosbroeck, J., Guénaut, C., Audi, G., Beck, D., Blaum, K., Bollen, G., Cederkäll, J., Delahaye, P., De Maesschalck, A., De Witte, H., Fedorov, D., Fedoseyev, V.N., Franchoo, S., Fynbo, Hans, Górska, M., Heyde, K., Herfurth, F., Huyse, M, Kellerbauer, A., Kluge, H-J., Smirnova, N.A., Köster, U., Van de Vel, K., Van Duppen, P., Van Dyck, A., Walters, W.B., Weissman, L., and Yazidjian, C.

Published
2004

30. Unambiguous Identification of Three $\beta$-Decaying Isomers in $^{70}$Cu

Author

Van Roosbroeck, J., Guénaut, C., Audi, G., Beck, D., Blaum, K., Bollen, G., Cederkall, J., Delahaye, P., De Maesschalck, A., De Witte, H., Fedorov, D., N. Fedoseyev, V., Franchoo, S., O. U. Fynbo, H., Górska, M., Herfurth, F., Heyde, K., Huyse, M., Kellerbauer, A., Kluge, H.-J., Köster, U., Kruglov, K., Lunney, D., I. Mishin, V., F. Mueller, W., Nagy, Sz., Schwarz, S., Schweikhard, L., Smirnova, N.A., Van De Vel, K., Van Duppen, P., Van Dyck, A., B. Walters, W., Weissman, L., Yazidjian, C., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
nuclear isomerism, nuclear shell model, nuclear energy levels, wave functions, 21.10.Dr, 07.75.+h, 27.50.+e, 32.80.Fb, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ground states, Particle Physics - Experiment, beta-decay, nuclei with mass number 59 to 89
Abstract

Using resonant laser ionization, $\beta$-decay studies and for the first time mass measurements, three $\beta$-decaying states have been unambiguously identified in $^{70}$Cu. A mass excess of -62976.1(1.6) keV and a half-life of 44.5(2) s for the (6$^{-}$) ground state have been determined. The level energies of the (3$^{−}$) isomer at 101.1(3) keV with $T_{1/2}=33(2)$ s and the $1^{+}$ isomer at 242.4(3) keV with $T_{1/2}=6.6(2)$ s are confirmed by high-precision mass measurements. The low-lying levels of $^{70}$Cu populated in the decay of $^{70}$Ni and in transfer reactions compare well with large-scale shell-model calculations, and the wave functions appear to be dominated by one proton–one neutron configurations outside the closed Z=28 shell and N=40 subshell. This does not apply to the $1^{+}$ state at 1980 keV which exhibits a particular feeding and deexcitation pattern not reproduced by the shell-model calculations.

Published
2004
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31. Unambiguous identification of three b-decaying isomers in 70Cu

Author

Van Roosbroeck, J, Guénaut, C, Audi, G, Beck, D, Blaum, K, Bollen, G, Cederkall, J, Delahaye, P, De Maesschalk, A, De Witte, H, Fedorov, D, Fedoseyev, VN, Franchoo, S, Fynbo, HOU, Górska, M, Herfurth, F, Heyde K, Huyse, Marc, Kellerbauer, A, Kluge, H, Köster, U, Kruglov, K, Lunney, D, Mishin, VI, Mueller, WF, Nagy, S, Schwarz, S, Schweikhard, L, Smirnova, NA, Van de Vel, K, Van Duppen, Piet, Van Dyck, A, Walters, WB, Weissman, L, and Yazidjian, C

Subjects
Isomers, Identification
Abstract

Using resonant laser ionization, beta-decay studies, and for the first time mass measurements, three beta-decaying states have been unambiguously identified in 70Cu. A mass excess of -62 976.1(1.6) keV and a half-life of 44.5(2) s for the (6-) ground state have been determined. The level energies of the (3-) isomer at 101.1(3) keV with T(1/2)=33(2) s and the 1+ isomer at 242.4(3) keV with T(1/2)=6.6(2) s are confirmed by high-precision mass measurements. The low-lying levels of 70Cu populated in the decay of 70Ni and in transfer reactions compare well with large-scale shell-model calculations, and the wave functions appear to be dominated by one proton-one neutron configurations outside the closed Z=28 shell and N=40 subshell. This does not apply to the 1+ state at 1980 keV which exhibits a particular feeding and deexcitation pattern not reproduced by the shell-model calculations. ispartof: Physical Review Letters vol:92 issue:11 pages:1-4 ispartof: location:United States status: published

Published
2004

32. Laser Ionization and Penning Trap Mass Spectrometry — A Fruitful Combination for Isomer Separation and High-precision Mass Measurements

Author

Blaum, K., primary, Beck, D., additional, Bollen, G., additional, Delahaye, P., additional, Guénaut, C., additional, Herfurth, F., additional, Kellerbauer, A., additional, Kluge, H. -J., additional, Köster, U., additional, Llunney, D., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

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34. Recent high-precision mass measurements with the Penning trap spectrometer ISOLTRAP

Author

Herfurth, F., primary, Audi, G., additional, Beck, D., additional, Blaum, K., additional, Bollen, G., additional, Delahaye, P., additional, George, S., additional, Guénaut, C., additional, Herlert, A., additional, Kellerbauer, A., additional, Kluge, H. -J., additional, Lunney, D., additional, Mukherjee, M., additional, Rahaman, S., additional, Schwarz, S., additional, Schweikhard, L., additional, Weber, C., additional, and Yazidjian, C., additional

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35. Is N = 40 magic? An analysis of ISOLTRAP mass measurements

Author

Guénaut, C., primary, Audi, G., additional, Beck, D., additional, Blaum, K., additional, Bollen, G., additional, Delahaye, P., additional, Herfurth, F., additional, Kellerbauer, A., additional, Kluge, H. -J., additional, Lunney, D., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

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36. Extending the mass “backbone” to short-lived nuclides with ISOLTRAP

Author

Guénaut, C., primary, Audi, G., additional, Beck, D., additional, Blaum, K., additional, Bollen, G., additional, Delahaye, P., additional, Herfurth, F., additional, Kellerbauer, A., additional, Kluge, H. -J., additional, Lunney, D., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

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37. Cadmium mass measurements between the neutron shell closures at N = 50 and 82

Author

Borgmann, Ch., primary, Breitenfeldt, M., additional, Audi, G., additional, Baruah, S., additional, Beck, D., additional, Blaum, K., additional, Böhm, Ch., additional, Cakirli, R. B., additional, Casten, R. F., additional, Delahaye, P., additional, Dworschak, M., additional, George, S., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kowalska, M., additional, Kreim, S., additional, Lunney, D., additional, Minaya-Ramirez, E., additional, Naimi, S., additional, Neidherr, D., additional, Rosenbusch, M., additional, Savreux, R., additional, Schwarz, S., additional, Schweikhard, L., additional, Yazidjian, C., additional, Demetriou, Paraskevi, additional, Julin, Rauno, additional, and Harissopulos, Sotirios, additional

Published
2011
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38. High-precision mass measurements for reliable nuclear astrophysics calculations

Author

Herlert, Alexander, primary, Baruah, S., additional, Blaum, K., additional, Breitenfeldt, M., additional, Delahaye, P., additional, Dworschak, M., additional, George, S., additional, Guénaut, C., additional, Hager, U., additional, Herfurth, F., additional, Kellerbauer, A., additional, Kluge, H.-Jürgen, additional, Lunney, D., additional, Savreux, R., additional, Schwarzh, S., additional, Schweikhard, Lutz, additional, and Yazidjian, C., additional

Published
2010
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39. Approaching theN=82shell closure with mass measurements of Ag and Cd isotopes

Author

Breitenfeldt, M., primary, Borgmann, Ch., additional, Audi, G., additional, Baruah, S., additional, Beck, D., additional, Blaum, K., additional, Böhm, Ch., additional, Cakirli, R. B., additional, Casten, R. F., additional, Delahaye, P., additional, Dworschak, M., additional, George, S., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kowalska, M., additional, Lunney, D., additional, Minaya-Ramirez, E., additional, Naimi, S., additional, Neidherr, D., additional, Rosenbusch, M., additional, Savreux, R., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2010
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41. Mass Measurements beyond the Majorr-Process Waiting PointZn80

Author

Baruah, S., primary, Audi, G., additional, Blaum, K., additional, Dworschak, M., additional, George, S., additional, Guénaut, C., additional, Hager, U., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Lunney, D., additional, Schatz, H., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2008
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42. Masses and Charge Radii ofNe17–22and the Two-Proton-Halo CandidateNe17

Author

Geithner, W., primary, Neff, T., additional, Audi, G., additional, Blaum, K., additional, Delahaye, P., additional, Feldmeier, H., additional, George, S., additional, Guénaut, C., additional, Herfurth, F., additional, Herlert, A., additional, Kappertz, S., additional, Keim, M., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Kowalska, M., additional, Lievens, P., additional, Lunney, D., additional, Marinova, K., additional, Neugart, R., additional, Schweikhard, L., additional, Wilbert, S., additional, and Yazidjian, C., additional

Published
2008
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43. Time-separated oscillatory fields for high-precision mass measurements on short-lived Al and Ca nuclides

Author

George, S., primary, Audi, G., additional, Blank, B., additional, Blaum, K., additional, Breitenfeldt, M., additional, Hager, U., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Kretzschmar, M., additional, Lunney, D., additional, Savreux, R., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2008
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45. Restoration of theN=82Shell Gap from Direct Mass Measurements ofSn132,134

Author

Dworschak, M., primary, Audi, G., additional, Blaum, K., additional, Delahaye, P., additional, George, S., additional, Hager, U., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Lunney, D., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2008
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46. High-precision masses of neutron-deficient rubidium isotopes using a Penning trap mass spectrometer

Author

Kellerbauer, A., primary, Audi, G., additional, Beck, D., additional, Blaum, K., additional, Bollen, G., additional, Guénaut, C., additional, Herfurth, F., additional, Herlert, A., additional, Kluge, H.-J., additional, Lunney, D., additional, Schwarz, S., additional, Schweikhard, L., additional, Weber, C., additional, and Yazidjian, C., additional

Published
2007
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49. Ramsey Method of Separated Oscillatory Fields for High-Precision Penning Trap Mass Spectrometry

Author

George, S., primary, Baruah, S., additional, Blank, B., additional, Blaum, K., additional, Breitenfeldt, M., additional, Hager, U., additional, Herfurth, F., additional, Herlert, A., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Kretzschmar, M., additional, Lunney, D., additional, Savreux, R., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2007
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50. High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure atN=40

Author

Guénaut, C., primary, Audi, G., additional, Beck, D., additional, Blaum, K., additional, Bollen, G., additional, Delahaye, P., additional, Herfurth, F., additional, Kellerbauer, A., additional, Kluge, H.-J., additional, Libert, J., additional, Lunney, D., additional, Schwarz, S., additional, Schweikhard, L., additional, and Yazidjian, C., additional

Published
2007
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