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Your search keyword '"Neidherr, D."' showing total 8 results
Start Over Author "Neidherr, D." Topic nuclear physics
8 results on '"Neidherr, D."'

1. PUMA, antiProton unstable matter annihilation

Author

Aumann, T., Bartmann, W., Boine-Frankenheim, O., Bouvard, A., Broche, A., Butin, F., Calvet, D., Carbonell, J., Chiggiato, P., de Gersem, H., de Oliveira, R., Dobers, T., Ehm, F., Somoza, J.Ferreira, Fischer, J., Fraser, M., Friedrich, E., Frotscher, A., Gomez-Ramos, M., Grenard, J.L., Hobl, A., Hupin, G., Husson, A., Indelicato, P., Johnston, K., Klink, C., Kubota, Y., Lazauskas, R., Malbrunot-Ettenauer, S., Marsic, N., O Müller, W.F., Naimi, S., Nakatsuka, N., Necca, R., Neidherr, D., Neyens, G., Obertelli, A., Ono, Y., Pasinelli, S., Paul, N., Pollacco, E.C., Rossi, D., Scheit, H., Schlaich, M., Schmidt, A., Schweikhard, L., Seki, R., Sels, S., Siesling, E., Uesaka, T., Vilén, M., Wada, M., Wienholtz, F., Wycech, S., Zacarias, S., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Kastler Brossel (LKB [Collège de France]), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF (institution))-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and PUMA

Subjects
CERN Lab, experimental methods, Nuclear Theory, p: density, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], sensitivity, annihilation, nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Physics - Experiment, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Physics::Atomic Physics, nucleus: density, Detectors and Experimental Techniques, nucleus: surface, Nuclear Experiment, activity report
Abstract

International audience; PUMA, antiProton Unstable Matter Annihilation, is a nuclear-physics experiment at CERN aiming at probing the surface properties of stable and rare isotopes by use of low-energy antiprotons. Low-energy antiprotons offer a very unique sensitivity to the neutron and proton densities at the annihilation site, i.e. in the tail of the nuclear density. Today, no facility provides a collider of low-energy radioactive ions and low-energy antiprotons: while not being a collider experiment, PUMA aims at transporting one billion antiprotons from ELENA, the Extra-Low-ENergy Antiproton ring, to ISOLDE, the rare-isotope beam facility of CERN. PUMA will enable the capture of low-energy antiprotons by short-lived nuclei and the measurement of the emitted radiations. In this way, PUMA will give access to the so-far largely unexplored isospin composition of the nuclear-radial-density tail of radioactive nuclei. The motivations, concept and current status of the PUMA experiment are presented.

Published
2022
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2. First glimpse of the $N=82$ shell closure below $Z=50$ from masses of neutron-rich cadmium isotopes and isomers

Author

Manea, V., Karthein, J., Atanasov, D., Bender, M., Blaum, K., Cocolios, T. E., Eliseev, S., Herlert, A., Holt, J. D., Huang, W. J., Litvinov, Yu. A., Lunney, D., Menéndez, J., Mougeot, M., Neidherr, D., Schweikhard, L., Schwenk, A., Simonis, J., Welker, A., Wienholtz, F., Zuber, K., Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), 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), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, nucl-th, Isòtops, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Espectroscòpia nuclear, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Nuclear spectroscopy, Nuclear Theory (nucl-th), Isotopes, Nuclear Physics - Theory, Physics::Atomic and Molecular Clusters, ddc:530, Nuclear Physics - Experiment, Präzisionsexperimente - Abteilung Blaum, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear Physics
Abstract

We probe the $N=82$ nuclear shell closure by mass measurements of neutron-rich cadmium isotopes with the ISOLTRAP spectrometer at ISOLDE-CERN. The new mass of $^{132}$Cd offers the first value of the $N=82$, two-neutron shell gap below $Z=50$ and confirms the phenomenon of mutually enhanced magicity at $^{132}$Sn. Using the recently implemented phase-imaging ion-cyclotron-resonance method, the ordering of the low-lying isomers in $^{129}$Cd and their energies are determined. The new experimental findings are used to test large-scale shell-model, mean-field and beyond-mean-field calculations, as well as the ab initio valence-space in-medium similarity renormalization group., Comment: 7 pages, 5 figures; reference added, minor editorial corrections

Published
2020
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3. Neutron Drip-Line Topography.

Author

Ramirez, E. Minaya, Audi, G., Beck, D., Blaum, K., Böhm, Ch., Borgmann, C., Breitenfeldt, M., Chamel, N., George, S., Goriely, S., Herfurth, F., Herlert, A., Kellerbauer, A., Kowalska, M., Lunney, D., Naimi, S., Neidherr, D., Pearson, J. M., Rosenbusch, M., and Schwarz, S.

Subjects
NEUTRON scattering, SPECTROMETERS, SPECTRUM analysis, EXTRAPOLATION, NUCLEAR physics
Abstract

The development of microscopic mass models is a crucial ingredient for the understanding of how most of the elements of our world were fabricated. Confidence in drip-line predictions of such models requires their comparison with new mass data for nuclides far from stability. We combine theory and experiment using results that are state of the art: the latest mass measurements from the Penning-trap spectrometer ISOLTRAP at CERN-ISOLDE are used to confront the predictions of the latest Skyrme-Hartree-Fock-Bogoliubov (HFB) microscopic mass models. In addition, we compare the new data to predictions of other types of mass models and the extrapolative behavior of the various models is analyzed to highlight topographical trends along the shores of the nuclear chart. [ABSTRACT FROM AUTHOR]

Published
2009
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4. Precise mass measurements of exotic nuclei—the SHIPTRAP Penning trap mass spectrometer.

Author

Herfurth, F., Ackermann, D., Blaum, K., Block, M., Chaudhuri, A., Dworschak, M., Eliseev, S., Ferrer, R., Heβberger, F., Hofmann, S., Kluge, H.-J., Maero, G., Martín, A., Marx, G., Mazzocco, M., Neidherr, D., Neumayr, J., Plaβ, W., Rahaman, S., and Rauth, C.

Subjects
NUCLEAR physics, SPECTROMETERS, PENNING trap mass spectrometry
Abstract

The SHIPTRAP Penning trap mass spectrometer has been designed and constructed to measure the mass of short-lived, radioactive nuclei. The radioactive nuclei are produced in fusion-evaporation reactions and separated in flight with the velocity filter SHIP at GSI in Darmstadt. They are captured in a gas cell and transferred to a double Penning trap mass spectrometer. There, the cyclotron frequencies of the radioactive ions are determined and yield mass values with uncertainties >=4.5·10-8. More than 50 nuclei have been investigated so far with the present overall efficiency of about 0.5 to 2%. [ABSTRACT FROM AUTHOR]

Published
2007
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5. Preparing a journey to the east of 208Pb with ISOLTRAP: Isobaric purification at A = 209 and new masses for 211-213Fr and 211Ra.

Author

Kowalska, M., Naimi, S., Agramunt, J., Algora, A., Audi, G., Beck, D., Blank, B., Blaum, K., Böhm, Ch., Breitenfeldt, M., Estevez, E., Fraile, L. M., George, S., Herfurth, F., Herlert, A., Kellerbauer, A., Lunney, D., Minaya-Ramirez, E., Neidherr, D., and Olaizola, B.

Subjects
ISOBARIC spin, MASS spectrometers, NEUTRONS, PARTICLES (Nuclear physics), NUCLEAR physics
Abstract

With the Penning trap mass spectrometer ISOLTRAP, located at ISOLDE/CERN, preparatory work has been performed towards mass and decay studies on neutron-rich Hg and Tl isotopes beyond N = 126 . The properties of these isotopes are not well known because of large isobaric contamination coming mainly from surface-ionised Fr. Within the studies, production tests using several target-ion source combinations were performed. It was furthermore demonstrated around mass number A = 209 that the resolving power required to purify Fr is achievable with ISOLTRAP. In addition, masses of several isobaric contaminants, 211-213Fr and 211Ra , were determined with a three-fold improved precision. The results influence masses of more than 20 other nuclides in the 208Pb region. [ABSTRACT FROM AUTHOR]

Published
2009
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6. Evolution of nuclear ground-state properties of neutron-deficient isotopes around Z = 82 from precision mass measurements.

Author

Böhm, Ch., Borgmann, Ch., Audi, G., Beck, D., Blaum, K., Breitenfeldt, M., Cakirli, R. B., Cocolios, T. E., Eliseev, S., George, S., Herfurth, F., Herlert, A., Kowalska, M., Kreim, S., Lunney, D., Manea, V., Ramirez, E. Minaya, Naimi, S., Neidherr, D., and Rosenbusch, M.

Subjects
*NUCLEAR physics, *NEUTRONS, *PARTICLE interactions, *NUCLEAR reactions, *NUCLEAR charge
Abstract

High-precision mass measurements of neutron-deficient Tl (A = 184, 186, 190, 193-195, 198) isotopes as well as Pb (A = 202,208), Fr (A = 207,208), and Ra (A = 224) are performed with the Penning-trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The improved precision of the mass data now allows the study of subtle odd-even effects. The gradual development of collectivity with the removal of protons from the magic Z = 82 core is analyzed by combining the new mass results with nuclear charge-radii data and mean-field model predictions. [ABSTRACT FROM AUTHOR]

Published
2014
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7. Mass spectrometry and decay spectroscopy of isomers across the Z = 82 shell closure.

Author

Stanja, J., Borgmann, Ch., Agramunt, J., Algora, A., Beck, D., Blaum, K., Böhm, Ch., Breitenfeldt, M., Cocolios, T. E., Fraile, L. M., Herfurth, F., Herlert, A., Kowalska, M., Kreim, S., Lunney, D., Manea, V., Ramirez, E. Minaya, S. Naimi, Neidherr, D., and Rosenbusch, M.

Subjects
*MASS spectrometry, *NUCLEAR isomers, *SPECTRUM analysis, *NUCLEAR physics, *SPECTROMETRY
Abstract

Recent results from a measurement campaign studying the isomerism in neutron-deficient Tl isotopes are presented. The measurements make use of a nuclear spectroscopy setup coupled to the high-resolution Penning-trap mass spectrometer ISOLTRAP at CERN's radioactive ion-beam facility ISOLDE. The mass values of 190,194TI are improveci and a mass-spin-state assignment is carried out. An additional mass measurement of the grandparent nuclide 198At allows the deduction of the spin-state ordering in 190T1. As a result, the excitation energies of the isomers in both Tl isotopes are determined for the first time to Eex(194TI) = 260(15) keV and Eex(190Tl) = 89(12) keV. Furthermore, this allows anchoring of the ground-state and isomer masses of 194Bi, 202Fr, and 206Ac, which are linked by two independent α-decay chains. [ABSTRACT FROM AUTHOR]

Published
2013
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8. TRIGA-SPEC: A setup for mass spectrometry and laser spectroscopy at the research reactor TRIGA Mainz

Author

Ketelaer, J., Krämer, J., Beck, D., Blaum, K., Block, M., Eberhardt, K., Eitel, G., Ferrer, R., Geppert, C., George, S., Herfurth, F., Ketter, J., Nagy, Sz., Neidherr, D., Neugart, R., Nörtershäuser, W., Repp, J., Smorra, C., Trautmann, N., and Weber, C.

Subjects
*LASER spectroscopy, *LASERS, *RADIOACTIVE substances, *NUCLEAR physics
Abstract

Abstract: The research reactor TRIGA Mainz is an ideal facility to provide neutron-rich nuclides with production rates sufficiently large for mass spectrometric and laser spectroscopic studies. Within the TRIGA-SPEC project, a Penning trap as well as a beamline for collinear laser spectroscopy are being installed. Several new developments will ensure high sensitivity of the trap setup enabling mass measurements even on a single ion. Besides neutron-rich fission products produced in the reactor, also heavy nuclides such as 235U or 252Cf can be investigated for the first time with an off-line ion source. The data provided by the mass measurements will be of interest for astrophysical calculations on the rapid neutron-capture process as well as for tests of mass models in the heavy-mass region. The laser spectroscopic measurements will yield model-independent information on nuclear ground-state properties such as nuclear moments and charge radii of neutron-rich nuclei of refractory elements far from stability. TRIGA-SPEC also serves as a test facility for mass and laser spectroscopic experiments at SHIPTRAP and the low-energy branch of the future GSI facility FAIR. This publication describes the experimental setup as well as its present status. [Copyright &y& Elsevier]

Published
2008
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