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301. Lifetime measurements of high-spin states in101Agand their interpretation in the interacting boson fermion plus broken pair model

Author

Claes Fahlander, Dario Vretenar, M. De Poli, A. Dewald, A. Gadea, O. Yordanov, P. G. Bizzeti, D. Kast, F. Brandolini, M. Hausmann, T. Martinez, M. Górska, Slobodan Brant, A. Jungclaus, R. Peusquens, P. Sona, G. A. Müller, K. P. Lieb, H. Tiesler, E. Galindo, G. de Angelis, D. R. Napoli, A. Algora, H. Grawe, and Giovanni C. Bonsignori

Subjects
Condensed Matter::Quantum Gases, Physics, Nuclear and High Energy Physics, Particle physics, Spin states, 010308 nuclear & particles physics, 0103 physical sciences, Fermion, Interacting boson model, Scalar boson, 010306 general physics, 01 natural sciences, Boson
Abstract

Lifetimes of 20 high spin states in Ag-101 in the range between 0.2 and 200 ps have been measuredand interpreted within the boson fermion plus broken pair model.

Published
2001

302. GYROMAGNETIC FACTORS OF ISOMERS IN THE NEUTRON-RICH N = 40 REGION: THE CASE OF 69<font>CU</font>

Author

Stéphanie Teughels, Romain Coussement, P. H. Regan, G. Goldring, M. Stanoiu, D. L. Balabanski, R. D. Page, C. Borcea, F. de Oliveira Santos, N. A. Smirnova, M. Lewitowicz, Zs. Podolyák, Yu. Sobolev, G. Defrance, M. Sawicka, G. Neyens, J. M. Daugas, H. Grawe, Nico Coulier, M. Górska, C. R. Bingham, Georgi P. Georgiev, Michael Hass, Henryk Mach, I. Matea, M. Pfützner, K. P. Rykaczewski, Katrien Vyvey, Yu. E. Penionzkevich, and Robert Grzywacz

Subjects
Materials science, Analytical chemistry, Neutron
Published
2001

303. Coincidence Lifetime-measurements in 101<font>Ag</font>

Author

E. Galindo, D. N. Napoli, G. de Angelis, Claes Fahlander, T. Martinez, A. Gadea, O. Yordanov, H. Tiesler, A. Jungclaus, H. Grawe, M. Górska, M. De Poli, G. A. Müller, A. Dewald, R. Peusquens, M. Hausmann, K. P. Lieb, F. Brandolini, A. Algora, and P. G. Bizzeti

Subjects
Nuclear physics, Physics, Coincidence
Published
2001

305. STRUCTURE OF THE EXOTIC NUCLEI NEAR 70<font>Ni</font> PROBED BY ADVANCED TIME-DELAYED COINCIDENCE METHODS: THE INTERPRETATION OF THE 1.76 µs ISOMER IN 72<font>Cu</font>

Author

Robert Grzywacz, Yu. E. Penionzhkevich, Birger Fogelberg, Henryk Mach, F. Becker, F. de Oliveira Santos, M. J. G. Borge, Georgi P. Georgiev, G. Neyens, R. Boutami, Milena Mineva, Bo Cederwall, M. Sawicka, Z. Dlouhy, J. Mrazek, M. Pfützner, Wlodzimierz Klamra, J. Blomqvist, S. M. Lukyanov, M. Stanoiu, L. M. Fraile, P.I. Johansson, M. Lewitowicz, E. Ramströom, and H. Grawe

Subjects
Physics, Time delayed, Structure (category theory), Atomic physics, Coincidence, Interpretation (model theory)
Abstract

Structure of the exotic nuclei near 70Ni probed by advanced time delayed coincidence methods: the interpretation of the 1.76 μs isomer in 72Cu

Published
2001

306. Isomer Spectroscopy in90216Th126and the Magicity of92218U126

Author

F. Becker, F. Azaiez, O. Dorvaux, Juha Uusitalo, W. Korten, K. Hauschild, K.-H. Schmidt, K. Helariutta, R. Julin, E. Caurier, Heikki Kettunen, P. Rahkila, S. Juutinen, Paivi Nieminen, H. Grawe, M. Górska, M. Muikku, J. Döring, F. Nowacki, Peter M. Jones, Matti Leino, M. Rejmund, M. Belleguic, and Y. Le Coz

Subjects
Physics, Crystallography, Nuclear magnetic resonance, Pairing, Excited state, Degenerate energy levels, SHELL model, Pi, General Physics and Astronomy, Spectroscopy
Abstract

Excited states in (216)Th were investigated via prompt and delayed gamma decays and the recoil-decay tagging method. The decay schemes of the I(pi) = (8+), t(1/2) = 128(8) micros, the I(pi) = (11-), t(1/2) = 615(55) ns, and the I(pi) = (14+), t(1/2) > or = 130 ns isomers were established. The configuration pi h(9/2)f(7/2) is assigned to the I(pi) = (8+) isomer, which implies that the h(9/2) and f(7/2) states are nearly degenerate. This is ascribed to increased binding of the f(7/2) orbital by its coupling to a low-lying I(pi) = (3-) state at E(x) = 1687 keV. The role of octupole and pairing correlations for a Z = 92 shell closure prediction is discussed on the basis of shell model calculations.

Published
2001

307. Proton versus neutron excitations in the high-spin spectrum of102Cd

Author

M. De Poli, G. de Angelis, A. Jungclaus, A. Dewald, D. Kast, R. Peusquens, K. P. Lieb, I. P. Johnstone, Claes Fahlander, H. Tiesler, P. G. Bizzeti, H. Grawe, and M. Górska

Subjects
Physics, Nuclear and High Energy Physics, Spins, 010308 nuclear & particles physics, Yrast, Magnetic rotation, SHELL model, Parity (physics), Model parameters, 01 natural sciences, Recoil, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

Using the reaction ${}^{58}\mathrm{Ni}{(}^{50}\mathrm{Cr},\ensuremath{\alpha}$ $2p)$ and the coincidence recoil distance Doppler shift technique, we determined picosecond lifetimes of high-spin states in ${}^{102}\mathrm{Cd}.$ The positive-parity yrast and yrare cascades evidence the competition and interplay of the two proton holes in the ${g}_{9/2}$ orbit and four neutrons in the ${d}_{5/2},$ ${g}_{7/2},$ and ${h}_{11/2}$ orbits, outside the $Z=N=50$ ${}^{100}\mathrm{Sn}$ core. At positive parity, this interplay leads to multiplets of states in the spin range ${6}^{+}--{10}^{+},$ some of which are connected by very weak $E2$ transitions. At higher spins, spin-aligned proton holes and neutrons lead to magnetic rotation. Energies and transition strengths when compared with the predictions of several shell model calculations reveal the high sensitivity on the model parameters.

Published
2001

308. Excited states in103Sn:Neutron single-particle energies with respect to100Sn

Author

M. Wolińska, J. Blomqvist, E. Farnea, Marek Moszynski, D. Bazzacco, Lars-Olov Norlin, Bo Cederwall, H. A. Roth, H. Grawe, Andras Kerek, N. Hashimoto-Saitoh, Claes Fahlander, Corina Andreoiu, D. Seweryniak, A. Gadea, Dirk Rudolph, T.R. Saitoh, Alejandro Algora, C. Rossi-Alvarez, B. Fant, J. Kownacki, Joakim Cederkäll, M. Palacz, Dóra Sohler, L. Berglund, Andrej Likar, D. R. Napoli, Johan Nyberg, Torbjörn Bäck, S. M. Lenzi, M. Górska, A. Atac, Karin Lagergren, Wlodzimierz Klamra, Matej Lipoglavšek, Ö. Skeppstedt, Zsolt Dombrádi, G. de Angelis, A. Johnson, and Matthias Weiszflog

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, SHELL model, Detector, Polarization (waves), 01 natural sciences, Spectral line, Gamma gamma, Nuclear physics, Atomic orbital, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract

Gamma-ray lines from Sn-103 have been identified for the first time using EUROBALL and ancillary detectors. The level scheme of Sn-103 has been established by means of particle-gated gamma gamma coincidences. The energy spacing between the g(7/2) and d(5/2) neutron single-particle orbitals is determined from the excited states in Sn-103.

Published
2001

309. A new $\mu$s isomer in $^{136}$Sb produced in the projectile fission of $^{238}$U

Author

Birger Fogelberg, K.-H. Schmidt, H. J. Wollersheim, J. Kurcewicz, J. A. Pinston, C. Mazzocchi, M. Lewitowicz, I. Kojouharov, M. Górska, P. Mayet, M. Bernas, Zsolt Podolyak, Milena Mineva, K. Sümmerer, C. R. Bingham, C. Schlegel, T. Enqvist, Yu. N. Kopatch, J. Gerl, Margareta Hellström, Robert Grzywacz, K. Hauschild, H. Gausemel, Dirk Rudolph, M. Pfützner, Z. Janas, J. Genevey, A. Korgul, P. H. Regan, F. Becker, S. K. Mandal, Henryk Mach, W. Korten, R. Lucas, H. Grawe, Hans Geissel, H. Schaffner, M. Rejmund, Institut de Physique Nucléaire d'Orsay (IPNO), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Fission products, Isotope, 010308 nuclear & particles physics, Fission, Projectile, Nuclear Theory, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Isotope separation, law.invention, Nuclear physics, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

The neutron-rich isotope 136Sb has been produced following the relativistic projectile fission of 238U in an experiment performed at the Fragment Separator at GSI, Darmstadt. Delayed γ-ray spectroscopy of the fission products has been performed after isotope separation. A new isomeric state in 136Sb has been populated, and its lifetime measured as T1/2 = 565(50) ns. Realistic and empirical shell-model calculations have been performed and are compared to the experimental observables.

Published
2001

310. Nuclear structure studies by means of short-lived isomers at intermediate energies

Author

B. Blank, Robert Grzywacz, H. Grawe, M. Lewitowicz, J. M. Daugas, Gerda Neyens, P. H. Regan, K. P. Rykaczewski, M. Pfützner, Lion, Michel, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Neutron temperature, Nuclear physics, Excited state, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Line (formation)
Abstract

Short-lived (Tl,z about 0.1 to 100~s) isomeric states have been studied for over forty years. Among the methods used for their production thermal neutron induced fission played initially the most, important role (see for example [l]). However, the mass A and atomic number Z of excited fission fragments usually were not directly measured in these experiments limiting the possibility for a search of weakly produced isomers. Presently, the most important, source of spectroscopic information on the structure of short-lived isomers is in-beam spectroscopy applied to fusion-evaporation, deep-inelastic and fission reactions at several MeV per nucleon. Strongly decreasing production cross sections very far from the line of stability put severe constrains on the search for new isomers using in-beam spectroscopy methods. In many cases this difficulty can be overcome using fragmentation-like reactions at several tens or hundreds MeV per nucleon. The study of short-lived isomeric states at intermediate and relativistic energies combines an unambiguous and fast event-by-event identification of nuclei far from stability with

Published
2001

311. (68)(28)Ni(40): Magicity versus superfluidity

Author

O, Sorlin, S, Leenhardt, C, Donzaud, J, Duprat, F, Azaiez, F, Nowacki, H, Grawe, Zs, Dombrádi, F, Amorini, A, Astier, D, Baiborodin, M, Belleguic, C, Borcea, C, Bourgeois, D M, Cullen, Z, Dlouhy, E, Dragulescu, M, Górska, S, Grévy, D, Guillemaud-Mueller, G, Hagemann, B, Herskind, J, Kiener, R, Lemmon, M, Lewitowicz, S M, Lukyanov, P, Mayet, F, de Oliveira Santos, D, Pantalica, Yu-E, Penionzhkevich, F, Pougheon, A, Poves, N, Redon, M G, Saint-Laurent, J A, Scarpaci, G, Sletten, M, Stanoiu, O, Tarasov, and Ch, Theisen

Abstract

The neutron-rich (66,68)Ni have been produced at GANIL via interactions of a 65.9A MeV 70Zn beam with a 58Ni target. Their reduced transition probability B(E2;0(+)(1)--2+) has been measured for the first time by Coulomb excitation in a (208)Pb target at intermediate energy. The B(E2) value for (68)Ni(40) is unexpectedly small. An analysis in terms of large scale shell model calculations stresses the importance of proton core excitations to reproduce the B(E2) values and indicates the erosion of the N = 40 harmonic-oscillator subshell by neutron-pair scattering.

Published
2000

312. βdecay of98Ag:Evidence for the Gamow-Teller resonance near100Sn

Author

M. Shibata, R. Kirchner, B. A. Brown, Berta Rubio, A. Gadea, D. Cano-Ott, M. Górska, J. L. Tain, F. Moroz, M. Karny, Z. Janas, M. Rejmund, Jorge Agramunt, L. Batist, E. Roeckl, R. Collatz, J. Szerypo, V. Wittmann, Alejandro Algora, H. Grawe, Z. Hu, M. Gierlik, A. Płochocki, and Margareta Hellström

Subjects
Physics, Nuclear and High Energy Physics, Quantum mechanics, Resonance (particle physics)
Published
2000

313. Nuclear structure in the vicinity of shell closures far from stability

Author

J. M. Daugas, K. P. Rykaczewski, F. Nowacki, M. Górska, M. Palacz, E. Caurier, F. Azaiez, M. Sawicka, S. Leenhardt, J. Uusitalo, Claes Fahlander, H. Grawe, M. Rejmund, Robert Grzywacz, M. Lewitowicz, O. Sorlin, J. Döring, K. Hauschild, M. Pfützner, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Arnould M. Lewitowicz M. Oganessian Yu. Ts. Akimune H. Ohta M. Utsunomya H. Wada T. Yamagata T., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
010308 nuclear & particles physics, Chemistry, Nuclear structure, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Polarization (waves), 01 natural sciences, Nickel, Mean field theory, Atomic orbital, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Excitation
Abstract

The status of experimental approach to 100Sn and 78Ni is reviewed. Revised single particle energies for neutrons are deduced for the N=Z=50 shell closure and evidence for low lying Iπ=2+ and 3− states is presented. Moderate E2 polarization charges of 0.1 e and 0.6 e are found to reproduce the experimental data when core excitation of 100Sn is properly accounted for in the shell model. For the neutron rich Ni region no conclusive evidence for an N=40 subshell is found, whereas firm evidence for the persistence of the N=50 shell at 78Ni is inferred from the existence of seniority isomers. The disappearance of this isomerism in the mid νg9/2 shell is discussed. The spectroscopy of 216Th disproves the existence of a Z=92 shell gap as predicted by some recent mean field calculations. Inversion of the πh9/2 and f7/2 orbitals at Z=90 is ascribed to the coupling of the f7/2 (and i13/2) protons to the low-lying 3− state (ℏω3=1.69 MeV).

Published
2000

314. Interplay between nuclear structure and reaction mechanism in the production of projectile-like short-lived isomers

Author

C. Longour, O. Sorlin, Z. Janas, M. Lewitowicz, S. Franchoo, P. Van Duppen, Leif Axelsson, C. Borcea, K. P. Rykaczewski, M. Karny, A. Płochocki, D. Guillemaud-Mueller, Marc Huyse, M. G. Saint-Laurent, J. C. Angélique, H. Grawe, N. A. Orr, Th. Ethvignot, J. E. Sauvestre, M. Glogowski, M. J. Lopez-Jimenez, R. Anne, M. Pfützner, J. M. Daugas, E. Chabannat, R. Béraud, A. Nowak, Robert Grzywacz, F. De Oliveira-Santos, A.C. Mueller, J. S. Winfield, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Flores, Sylvie, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Sherrill B.M., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-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), 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), and 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)

Subjects
Reaction mechanism, Projectile, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear structure, chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Isomeric shift, chemistry, Fragmentation (mass spectrometry), Chemical physics, Mass spectrum, Atomic physics, health care economics and organizations
Abstract

International audience; Isomeric ratios and the momentum distributions of nuclei produced in the fragmentation of a 60AMeV 92Mo beam on a thin 27Al target have been studied. A strong dependence of the isomeric ratio on the structure of the isomer and on the reaction mechanism has been observed for the first time at intermediate energies.

Published
2000

315. Particle octupole-vibration coupling near 208Pb

Author

R. Broda, B. Fornal, J. Blomqvist, H. Grawe, Ch. Schlegel, M. Kaspar, H. J. Wollersheim, J. Gerl, H. Schaffner, M. Górska, M. Rejmund, A. Gadea, R. Schubart, K. H. Maier, J. Wrzesinski, and M. Lach

Subjects
Coupling, Physics, Nuclear and High Energy Physics, Nuclear Theory, Hadron, Inelastic collision, Coulomb barrier, Nuclear fusion, Particle, Atomic physics, Nuclear Experiment, Excitation, Beam (structure)
Abstract

High-spin states in nuclei around 208Pb were populated in deep inelastic collisions of 136Xe and 208Pb projectiles with 208Pb targets at beam energies about 12% above the Coulomb barrier. New states in nuclei in the vicinity of 208Pb have been found that result from the coupling of one and two quasi particles to the lowest 3− excitation of the 208Pb core. They show the influence of particle octupole-vibration coupling in a pronounced and clear way and verify the validity of this concept.

Published
2000

316. βdecay of66Co,68Co,and70Co

Author

W. F. Mueller, J. Van Roosbroeck, Ulli Köster, Marc Huyse, L. Vermeeren, R. Raabe, N. V. S. V. Prasad, S. Franchoo, K. Kruglov, B. Bruyneel, P. G. Thirolf, A. Płochocki, Z. Janas, M. Karny, Yuri Kudryavtsev, J. Kurpeta, I. Reusen, Leonid Weissman, B. Pfeiffer, P. Van Duppen, W. B. Walters, H. Grawe, T. Kszczot, and K. L. Kratz

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics
Published
2000

317. Isomer spectroscopy of neutron rich $^{190}$W$_{116}$

Author

J. Giovinazzo, M. Caamaño, Ch. Schlegel, Furong Xu, Milena Mineva, P. Mayet, Margareta Hellström, A. Kleinböhl, S. C. Wooding, D. Cortina Gil, Robert Grzywacz, Ch. Theisen, W. Gelletly, H. J. Wollersheim, P. A. Butler, J. Döring, P. M. Walker, M. Pfützner, M. Górska, P. H. Regan, K.-H. Schmidt, T. Enqvist, C. J. Pearson, H. Grawe, M. Lewitowicz, W. Korten, F {Rejmund}, C. Fox, F. de Oliveira, Henryk Mach, D. D. Warner, Ani Aprahamian, J. Garcés Narro, Hans Geissel, Zsolt Podolyak, H. Schaffner, M. Sawicka, J. Gerl, D. M. Cullen, R. Lucas, J. Benlliure, Alison Bruce, M. Rejmund, C.D. O'Leary, C. Wheldon, Institut de Physique Nucléaire d'Orsay (IPNO), 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Millisecond, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, medicine, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy, Nucleus, Beam (structure)
Abstract

Gamma-rays de-exciting a millisecond isomer in the neutron-rich nucleus 74/190W116 have been observed following relativistic projectile fragmentation of a 1 GeV per nucleon 208Pb beam. The isomeric decay populates the ground-state rotational band, with energies that indicate a significant deformation change at Z = 74 for the N = 116 isotones. The successful application of the projectile fragmentation technique in a region of deformed nuclei opens up the prospect of exploiting K-isomer decays to probe the evolution of collective nuclear structure far from the valley of beta stability. (C) 2000 Elsevier Science B.V.

Published
2000

318. The 8+ isomer in $^{78}$Zn and the doubly magic character of $^{78}$Ni

Author

R. Béraud, R.C. Lemmon, M. Sawicka, R. Bentida, W. N. Catford, H. Grawe, L. Achouri, F. Nowacki, F. de Oliveira Santos, G. Sletten, M. Pfützner, J. C. Angélique, J. M. Daugas, C. Borcea, K. P. Rykaczewski, P. H. Regan, D. Baiborodin, K. L. Jones, A. Emsallem, M. J. Lopez Jimenez, Robert Grzywacz, K. Bennaceur, J. E. Sauvestre, M. Lewitowicz, C. R. Bingham, M. Stanoiu, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), 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), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-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)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, scientific edition, SHELL model, Parity assignment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Open Access, Humanities, Fragmentation (mass spectrometry), Open Archives, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Physics
Abstract

A new isomeric state in 78Zn has been identified and studied in the fragmentation of a 60.5 AMeV 86Kr beam on a natNi target. The measured energies of the transitions and the half-life, T1/2=319(9) ns, of the isomeric decay suggest a spin and parity assignment F=S+. The deduced B(E2,S+ -+ 6+) value equals 1.21(5) W.u. is well reproduced in large scale shell model calculations using realistic interactions in the proton-neutron 2p3/2, 1f5/2' 2p1/2' 199 / 2 model space. Standard E2 polarisation charges of D.5e for both protons and neutrons were used. This result consists the first experimental evidence of the persistance of the N=50 shell gap in the vicinity f 78N' o 28 150·

Published
2000

319. βdecay of97Ag: Evidence for the Gamow-Teller resonance near100Sn

Author

D. Cano-Ott, H. Grawe, M. Rejmund, M. Shibata, Z. Hu, F. Moroz, Jorge Agramunt, R. Collatz, M. Górska, J. L. Tain, M. Karny, M. Gierlik, B. A. Brown, A. Płochocki, V. Wittmann, Berta Rubio, Margareta Hellström, Alejandro Algora, E. Roeckl, R. Kirchner, L. Batist, J. Szerypo, Z. Janas, and A. Gadea

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Decay scheme, Double beta decay, Resonance, Atomic physics, Beta decay, Beta-decay stable isobars
Published
1999

320. Lifetime study of particle-hole excitations in the semimagic nucleus94Ru

Author

A. Jungclaus, D. Kast, K. P. Lieb, C. Teich, M. Weiszflog, T. Härtlein, C. Ender, F. Köck, D. Schwalm, I. P. Johnstone, J. Reif, R. Schwengner, R. Peusquens, A. Dewald, J. Eberth, H. G. Thomas, M. Górska, and H. Grawe

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Radiation, 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Particle, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Beam energy
Abstract

The recoil-distance Doppler-shift technique was employed for determining lifetimes of high-spin states in the semimagic nucleus ${}^{93}\mathrm{Tc}.$ The nuclei were populated using the reaction ${}^{64}\mathrm{Zn}{(}^{35}\mathrm{Cl},$ $\ensuremath{\alpha}2p)$ at a beam energy of 135 MeV, and the $\ensuremath{\gamma}$ radiation from their decay was detected in the GASP spectrometer. A total of 26 reduced transition probabilities and limits for 19 further transitions were extracted and compared to large-scale shell model calculations, considering different configuration spaces and residual interactions. The information deduced about transition strengths turned out to be essential for the correct assignment of the calculated to the experimental excited states.

Published
1999

321. Nuclear structure in the region of [sup 100]Sn at N≃Z

Author

G. de Angelis, E. Roeckl, A. Axelsson, A. Gadea, H. Grawe, M. Górska, Z. Hu, Claes Fahlander, Matej Lipoglavšek, and Johan Nyberg

Subjects
Radioactive ion beams, chemistry, Polarizability, SHELL model, Nuclear structure, chemistry.chemical_element, Gamma spectroscopy, Atomic physics, Highly selective, Tin, Interpretation (model theory)
Abstract

With the recent development of efficient γ-arrays with highly selective ancillary detectors, studies of shell structure and residual interaction in exotic nuclei like 100Sn have become feasible. The shell structure at N=Z=50 (100Sn) shows a remarkable similarity to N=Z=28 (56Ni), albeit recent experiments on the 100Sn neighbors 102,104Sn and 98Cd indicate substantial and puzzling deviations in the E2 and E3 polarizability of the magic core 1–3. New experimental results and their shell model interpretation are discussed.

Published
1999

322. Total absorption spectroscopy of [sup 150]Ho 2[sup −] and [sup 150]Ho 9[sup +] decays

Author

D. Cano-Ott, M. Górska, F. Moroz, Z. Hu, K. Rykaczewski, P. Kleinheinz, R. Kirchner, H. Grawe, J. Szerypo, E. Roeckl, M. Karny, Magnus Hellström, L. Batist, A. Gadea, V. Wittmann, R. Collatz, Jorge Agramunt, A. Plochocki, J. L. Tain, M. Shibata, B. Rubio, Z. Janas, and M. Gierlik

Subjects
Absorption spectroscopy, Total absorption spectroscopy, law, Chemistry, Pairing, Gamma spectroscopy, Atomic physics, Polarization (waves), Isotope separation, law.invention
Abstract

The problem of the Gamow-Teller (GT) quenching consists in the overestimation of the predicted Strength with respect to the experimental one. A retardation of the allowed GT transitions has been explained in terms of core polarization, pairing correlations ant higher order phenomena [1], but its understanding requires reliable experimental results.

Published
1999

323. Monte Carlo study of the charged-particle detectors used in NORDBALL and EUROBALL spectrometers

Author

A Axelsson, H. Grawe, S. Ashrafi, A. Likar, R. Schwengner, T. Vidmar, Johan Nyberg, and M. Lipoglavsek

Subjects
Physics, Nuclear physics, Charged particle detectors, Spectrometer, Physics::Instrumentation and Detectors, Monte carlo code, Monte Carlo method, Detector, Alpha-particle spectroscopy, Gamma spectroscopy, Nuclear Experiment, Spectral line
Abstract

The ancillary charged-particle detector arrays used inside the NORDBALL and the EUROBALL spectrometers were simulated employing the Monte Carlo code GEANT3. The simulated charged-particle spectra are in good agreement with the experimental ones.

Published
1999

324. Production of N≅Z nuclei with A≈100 via complete heavy-ion fusion reactions followed by cluster emission

Author

E. Roeckl, Antonio D'Onofrio, M. Rejmund, A. Gadea, M. Glogowski, K.-H. Schmidt, Filippo Terrasi, K. P. Rykaczewski, N. Belcari, M. La Commara, R. Kirchner, Mario R. Romano, Claes Fahlander, J. Gomez del Campo, H. Grawe, Margareta Hellström, Vincenzo Roca, G. de Angelis, M. Górska, R. Borcea, and P. Jarillo-Herrero

Subjects
Nuclear reaction, Neutron emission, Chemistry, Astrophysics::High Energy Astrophysical Phenomena, Isotopes of cadmium, Isotopes of tin, Analytical chemistry, Nuclear fusion, Alpha particle, Atomic physics, Nuclear Experiment, Charged particle, Ion
Abstract

The production of isotopes near 100Sn has been investigated by using on-line mass separation of evaporation residues produced by heavy-ion induced complete fusion reactions. We measured β-delayed protons and γ-rays, deduced the mass-separated beam intensities for 99Cd, 100In, 101Sn and 102In, and determined the corresponding production cross-sections σ for 58Ni+58Ni reactions followed by emission of nuclear clusters, and for 58Ni+50Cr reactions accompanied by emission of protons, neutrons and α particles. The results indicate that the σ values for reactions followed by emission of clusters are comparable with those for reactions proceeding through light particle emission. Due to recoil-loss effects in on-line mass separation, the former mechanism is less suitable than the latter one for producing such neutron-deficient nuclei in this kind of experiments.

Published
1999

325. Beta decay of $^{61}$Ga

Author

A. Płochocki, Juha Äystö, Peter Dendooven, Yoshitaka Fujita, Ari Jokinen, G. Walter, Z. Janas, O. Klepper, H. Grawe, M. Górska, M. Ramdhane, Z. Hu, A. Knipper, Weiping Liu, Heikki Penttilä, E. Roeckl, Markku Oinonen, R. Kirchner, P. Baumann, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Hadron, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Beta decay, medicine.anatomical_structure, Excited state, medicine, Nuclear fusion, Atomic physics, Ground state, Spectroscopy, Nucleus
Abstract

The β decay of 61Ga to its mirror nucleus 61Zn has been measured for the first time by using on-line mass separation and β-delayed gamma-ray spectroscopy. The observed decay strength to the ground state implies superallowed character in accordance with the systematics of the mirror decays in the sd and fp shell. The β feedings observed to four excited states in 61Zn are consistent with earlier spin-parity assignments based on in-beam experiments. The ground-state spin and parity for 61Ga were determined to be 3/2−.

Published
1999

326. Microsecond isomers beyond [sup 68]Ni

Author

R. Grzywacz, J. M. Daugas, L. Achouri, J. C. Angelique, D. Baiborodin, R. Béraud, R. Bentida, C. Bingham, C. Borcea, W. N. Catford, A. Emsallem, G. de France, H. Grawe, K. L. Jones, M. Lewitowicz, R. Lemmon, M. J. Lopez, F. de Oliveira, M. Pfützner, P. H. Regan, K. Rykaczewski, M. Sawicka, J. E. Sauvestre, G. Sletten, and M. Stanoiu

Subjects
Microsecond, Crystallography, Fragmentation (mass spectrometry), Chemistry, Excited state, 0202 electrical engineering, electronic engineering, information engineering, 020206 networking & telecommunications, 020201 artificial intelligence & image processing, Gamma spectroscopy, 02 engineering and technology, Atomic physics, 7. Clean energy
Abstract

Excited states in the nuclei with Z{approx}28 and N{approx}40 have been studied. These neutron-rich nuclei have been produced in the fragmentation reaction of a {sup 86}Kr beam at 60.3 MeV/ nucl. The decays of isomers populated in the fragmentation are detected at the final focus of the spectrometer in event-by-event microsecond correlation with identified recoils. Several new isomers with half-lives {approx}300 ns have been discovered including the very exotic {sup 78m}Zn. A puzzling result of the performed experiment, the non-observation of expected I{sup {pi}}=8{sup +} isomers in {sup 72}Ni and {sup 74}Ni nuclei is also reported. (c) 1999 American Institute of Physics.

Published
1999

327. Observation of the GT resonance in the β[sup +]-decay of [sup 150]Ho 2[sup −]

Author

A. Plochocki, Z. Hu, M. Górska, R. Collatz, K. Rykaczewski, D. Cano-Ott, P. Kleinheinz, B. Rubio, M. Gierlik, R. Kirchner, M. Shibata, R. Borcea, F. Moroz, O. Guilbaud, Magnus Hellström, J. Gerl, T. Martinez, L. Batist, E. Roeckl, M. Karny, J. Szerypo, Z. Janas, H. Grawe, M. Rejmund, W. Liu, Jorge Agramunt, J. L. Tain, V. Wittmann, Alejandro Algora, and A. Gadea

Subjects
Physics, Spectrometer, Detector, Nuclear structure, Resonance, chemistry.chemical_element, Germanium, Beta decay, chemistry, High Energy Physics::Experiment, Beta (velocity), Gamma spectroscopy, Atomic physics, Nuclear Experiment
Abstract

The Gamow-Teller beta decay of 150Ho2− isomer has been studied with a Total Absorption Spectrometer (TAS), with an array of 6 Euroball CLUSTER Germanium detectors (CLUSTER CUBE), and with an alpha detector. The three techniques complement each other. The results provide the first observation of an extremely sharp resonance in GT beta decay. The analysis of the beta provides a precise value of the β-strength within the decay window.

Published
1999

328. Recent beta-decay experiments on nuclei beyond [sup 56]Ni

Author

R. Kirchner, K.-H. Schmidt, Juha Äystö, Peter Dendooven, P. Mayet, C. Schlegel, M. Sawicka, H. Grawe, R. Borcea, H. Pentilla, M. La Commara, M. Górska, E. Roeckl, M. Karny, M. Rejmund, A. Niemenen, Ronald Schwengner, A. Płochocki, Margareta Hellström, Ari Jokinen, M. Gierlik, and Z. Janas

Subjects
Nuclear physics, Isotope, Branching fraction, Electron capture, law, Isotopes of copper, Chemistry, Nuclear structure, Mass spectrometry, Beta decay, Isotope separation, law.invention
Abstract

By using heavy-ion induced fusion-evaporation reactions at the on-line mass separator of GSI, we investigated {beta}-decay properties of the neutron-deficient isotopes {sup 56}Cu, {sup 57}Zn and {sup 61}Ga. The results will be presented and discussed in comparison with shell-model predictions.

Published
1999

329. Nuclear structure near the doubly-magic [sup 100]Sn

Author

G. de Angelis, Johan Nyberg, Z. Hu, Matej Lipoglavšek, Claes Fahlander, H. Grawe, M. Górska, E. Roeckl, and A. Gadea

Subjects
Physics, Isovector, Mean field theory, Nuclear Theory, Nuclear structure, Nuclear shell model, Extrapolation, Nuclear force, Neutron, Atomic physics, Excitation
Abstract

The single particle (hole) energies in 100Sn, as extrapolated by a shell model analysis of the neighboring nuclei, show a remarkable similarity to those in 56Ni, one major shell lower. This is borne out in nearly identical Iπ=2+ excitation energies, implying E(2+)≃3 MeV in 100Sn, and a large neutron effective E2 charge e⩾1.6e. In contrast a small proton polarization charge δe⩽0.3e is found, pointing to a large isovector charge. Mean field predictions for single particle energies show substantial deviations from the experimental extrapolation. From the experimental two-proton hole spectrum in 98Cd an improved empirical interaction is extracted for the π(p1/2,g9/2) model space yielding a good description of the N=50 isotones 95Rh to 98Cd. In 104Sn, for the first time in this region, strong E3 transitions with B(E3)⩾17 W.u. were identified, indicating E(3−)≃3 MeV in 100Sn. New experimental devices, as the Ge-cluster cube and total absorption spectrometers, applied in a pioneering experiment to the β+/EC deca...

Published
1999

330. Beta-decay of

Author

L. V. Chulkov, R. Raabe, Weiping Liu, A. Wöhr, Margareta Hellström, E. Roeckl, G. Vancraeynest, D. Cortina Gil, M. Pfützner, F. Farget, I. Reusen, Z. Hu, H. Grawe, J. Benlliure, R. Collatz, A. Piechaczek, and Naohito Iwasa

Subjects
Nuclear physics, Physics, Particle physics, Proton, Solar neutrino, Absorption cross section, Proton spectra, High Energy Physics::Experiment, Neutrino, Beta decay, Event (particle physics)
Abstract

The β-decay of 40Ti was studied by measuring the β-decayed proton- and γ-emission. The half-life for 40Ti was determined to be 54(2) ms. The experimental β-decay strength distribution is compared with shell-model calculations and results from other experiments. Based on the experimental 40Ti β-decay strength, the neutrino absorption cross section and induced neutrino event rates for 40Ar were determined to be 14.3(3)×10−43 cm2 and 9.4±0.2(stat.)−1.6+13(syst.) SNU, respectively.

Published
1998

331. Beta-decay of

Author

M. Górska, B. A. Brown, M. Karny, B. Rubio, L. Batist, M. Gierlik, E. Roeckl, F. Moroz, M. Shibata, Jorge Agramunt, D. Cano-Ott, R. Kirchner, H. Grawe, R. Collatz, A. Plochocki, J. Szerypo, V. Wittmann, Alejandro Algora, M. Rejmund, J. L. Tain, A. Gadea, Z. Janas, Z. Hu, and Magnus Hellström

Subjects
Nuclear reaction, Quenching (fluorescence), Spectrometer, Chemistry, Nuclear Theory, Nuclear structure, Gamma spectroscopy, Atomic physics, Nuclear Experiment, Absorption (electromagnetic radiation), Resonance (particle physics), Excitation
Abstract

The 97Ag→97Pd β-decay was investigated by using a total absorption spectrometer and an array of 6 Euroball-Cluster Ge detectors. A total of 603 γ-rays de-exciting 151 levels in 97Pd have been assigned. The Gamow-Teller β-decay strength distributions from the experiment and a shell-model calculation are compared, revealing a dominant resonance around a 97Pd excitation energy of 4 MeV with a width of about 1.5 MeV. An experimental quenching factor of about 4.9(7) for the total Gamow-Teller strength was obtained, which is close to the predicted theoretical hindrance factor.

Published
1998

332. The GT resonance revealed in

Author

R. Collatz, Jürgen Gerl, R. Borcea, F. Moroz, W. Liu, Z. Janas, P. Kleinheinz, A. Gadea, R. Kirchner, K. Rykaczewski, Z. Hu, D. Cano-Ott, M. Shibata, T. Martinez, M. Karny, M. Rejmund, B. Ribio, E. Roeckl, M. Górska, H. Grawe, L. Batist, J. Agramunt, A. Algora, M. Gierlik, O. Guilbaud, A. Płochocki, V. Wittmann, Margareta Hellström, J. L. Tain, and J. Szerypo

Subjects
Physics, Isotope, Spectrometer, Physics::Instrumentation and Detectors, Resonance, Alpha particle, Beta decay, Particle detector, Semiconductor detector, Nuclear magnetic resonance, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Radioactive decay
Abstract

The GT beta decay of 150Ho has been studied with a Total Absorption Spectrometer (TAS), with an array of 6 Euroball CLUSTER Ge detectors (the CLUSTER CUBE), and with an alpha detector. The three techniques complement each other. The results provide the first observation of an extremely sharp resonance in GT beta decay.

Published
1998

333. Prolate-oblate shape coexistence in Kr-75

Author

H. Grawe, T. Mylaeus, A. von der Werth, S. Skoda, A. Kuhnert, J. Bea, R. Sefzig, J. Eberth, U. Hermkens, F. Becker, Berta Rubio, S. Freund, T. Burkardt, K. H. Maier, and W. Teichert

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Spectrometer, Spins, Yrast, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Física, Parity (physics), Coincidence, symbols.namesake, symbols, High Energy Physics::Experiment, Atomic physics, Doppler effect, Excitation
Abstract

The collective bands of 75Kr were extended up to spin 45 2 using the compound reactions 50Cr(28Si,2pn), 54Fe(24Mg,2pn) and 58Ni(20Ne,2pn)75Kr. Lifetimes were measured by RDDS with nine OSIRIS detectors in coincidence. Mixing ratios were determined by measurements of internal conversion coefficients, angular distribution and correlations. Deviations between different measurements are explained by the short lifetimes leading to angle dependent intensity losses due to Doppler shift. Spins and parities were assigned from angular distributions, excitation functions and DCO ratios measured with the OSIRIS_12 spectrometer. The band head spin of the negative parity yrast band was established as 3 2 via DCO ratios and internal conversion coefficients. Further bands at low excitation energy were found. In accordance to Woods-Saxon cranking model calculations, these weaker populated sidebands are interpreted to be built on oblate deformed intrinsic states (β2 ≈ −0.2), while the strongly populated bands are built on prolate deformed states (β2 ≈ +0.4). The interpretation of the 1qp g 9 2 yrare band, to be generated from oblate deformation, is further supported by ΔI = 0 transitions into the yrast band and a similar oblate deformed g 9 2 structure in the isotone 73Se. The experimental level energies, branching ratios, transition probabilities and mixing ratios are compared to rotor model calculations. The deviations between experiment and rotor model calculations are interpreted to be based on mixing between prolate and oblate states.

Published
1998
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334. Beta strength distribution in neutron-deficient nuclei

Author

J. Szerypo, A. Wöhr, K. P. Rykaczewski, E. Roeckl, R. Kirchner, Z. Hu, H. Grawe, R. Collatz, M. Shibata, M. Górska, D. Cano-Ott, B. Rubio, J. L. Tain, M. Gierlik, F. Moroz, A. Płochocki, A. Gadea, J. Agramunt, A. Gulielmetti, Margareta Hellström, M. Rejmund, M. Karny, Z. Janas, V. Wittmann, Alejandro Algora, L. Batist, B. A. Brown, and A. Piechaczek

Subjects
chemistry, Spectrometer, Beta (plasma physics), Nuclear Theory, chemistry.chemical_element, Neutron, Germanium, Gamma spectroscopy, Atomic physics, Nuclear Experiment, Absorption (electromagnetic radiation), Beta decay, Indium
Abstract

The results of recent studies of the Gamow-Teller β-decays of nuclei in the 100Sn region are presented. Measurements performed with the use of the total absorption γ-ray spectrometer and the Cluster Cube array of germanium detectors revealed qualitatively new information on the Gamow-Teller strength distribution in the decays of 97Ag and 103–107In. The shape of the measured β-strength distribution and the resulting total BGT values are compared with the results of shell-model calculations.

Published
1998

335. Spectroscopy of neutron deficient 65Ge

Author

D. Sohler, Zs. Dombrádi, S. Brant, J. Cederkäll, M. Lipoglavšek, M. Palacz, V. Paar, J. Persson, A. Atac̣, C. Fahlander, H. Grawe, A. Johnson, A. Kerek, W. Klamra, J. Kownacki, A. Likar, L. O. Norlin, J. Nyberg, R. Schubart, D. Seweryniak, G. de Angelis, P. Bednarczyk, D. Foltescu, M. Fayez-Hassan, D. Jerrestam, S. Juutinen, E. Mäkelä, B. M. Nyakó, M. de Poli, H. A. Roth, T. Shizuma, Ö. Skeppstedt, G. Sletten, and S. Törmänen

Subjects
Nuclear and High Energy Physics, nuclear structure, 65Ge, high spin states, IBFM, broken pairs, Nuclear Experiment
Abstract

Excited states of 65Ge were populated via the 12C plus 58Ni (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron detector systems for reaction channel separation. On the basis of gamma gamma-coincidence relations and angular distribution ratios a significantly extended level scheme was constructed up to excitation energy of 9 MeV and spin/parity of 33/2-. The low-energy states of the nucleus are discussed in the framework of the interacting boson-fermion model.

Published
1997

336. Odd-parity 100Sn Core Excitations

Author

G. de Angelis, D. Wolski, J. Iwanicki, H. Grawe, J. Galkowski, Marek Moszynski, Dirk Rudolph, M. Zieblinski, G. Jaworski, Jörgen Ekman, O. Dorvaux, K. Sieja, M. Palacz, Johan Nyberg, Piotr Bednarczyk, Dóra Sohler, M. Górska, Zsolt Dombrádi, F. Nowacki, D. Curien, J. Ljungvall, J. Kownacki, and A. Blazhev

Subjects
Physics, 010308 nuclear & particles physics, General Physics and Astronomy, Space (mathematics), 01 natural sciences, 7. Clean energy, Core (optical fiber), Atomic orbital, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Beam (structure), Excitation, Parity bit
Abstract

Odd-parity core excited states have been identified in two close neighbors of Sn-100: Pd-96 and Ag-97. This was done in an fusion-evaporation experiment, using a Ni-58 beam on a Sc-45 target. Even-parity core excited states in these nuclei are very well reproduced in large scale (LSSM) calculations in which particle-hole excitations are allowed with up to five g(9/2) protons and neutrons across the N = Z = 50 gap, to the g(7/2), d(5/2), d(3/2), and s(1/2) orbitals. The odd-parity states can only be qualitatively interpreted though, employing calculations in the full fpg shell model space, but with just one particle-hole core excitation allowed. A more complete model including odd-parity orbitals is need for the description of core excited states in the region of Sn-100. DOI:10.5506/APhysPolB.44.491 (Less)

Published
2013

337. Core Excitations Across the Neutron Shell Gap in 207Tl

Author

M. Bunce, C. Rodríguez Triguero, C. J. Chiara, G.D. Dracoulis, Zs. Podolyák, B. Fornal, M. Bowry, M. P. Carpenter, S. Zhu, B. Szpak, H. Grawe, T. Lauritsen, Calem Hoffman, F. G. Kondev, Philip M Walker, P. H. Regan, R. V. F. Janssens, N. Cieplicka, Matthew Reed, A. Y. Deo, E. Wilson, G. J. Lane, and R.S. Kempley

Subjects
Physics, Core (optical fiber), Shell (structure), General Physics and Astronomy, Neutron, Atomic physics, Mathematical physics
Abstract

Core excitations across the neutron shell gap in 207Tl E. Wilson a,∗,1, Zs. Podolyak a, H. Grawe b, B.A. Brown c, C.J. Chiara d,e,2, S. Zhu e, B. Fornal f, R.V.F. Janssens e, C.M. Shand a, M. Bowry a,3, M. Bunce a, M.P. Carpenter e, N. Cieplicka-Orynczak f,4, A.Y. Deo g,5, G.D. Dracoulis h, C.R. Hoffman e, R.S. Kempley a, F.G. Kondev i, G.J. Lane h, T. Lauritsen e, G. Lotay a,j, M.W. Reed a,6, P.H. Regan a,j, C. Rodriguez Triguero k, D. Seweryniak e, B. Szpak f, P.M. Walker a

Published
2013

338. 'Shears Bands' in Pb nuclei - a new nuclear structure effect

Author

H. Kluge, R. Schubart, H. Hübel, Jie Meng, W. Korten, S. Frauendorf, J. Heese, K. H. Maier, M. Neffgen, G. Baldsiefen, K. M. Spohr, W. Pohler, S. Chmel, U. J. van Severen, P. Willsau, and H. Grawe

Subjects
Physics, Angular momentum, Spins, Proton, Nuclear Theory, Nuclear structure, Condensed Matter Physics, Rotation, Atomic and Molecular Physics, and Optics, Dipole, Angular momentum of light, Neutron, Atomic physics, Mathematical Physics
Abstract

In nuclei in the mass region around A = 190-200 a large number of regular dipole sequences have recently been found. In these bands the gain in angular momentum may not be created by collective rotation as is usual for more deformed nuclei, but stems from aligning the proton and neutron spins in the direction of the total spin axis. Calculations within the frame-work of the tilted axis cranking model reproduce the available experimental data and support the alignment picture.

Published
1995

339. Application of the pulse-shape technique to proton-$\alpha$ discrimination in Si-detector arrays

Author

W. Bohne, Marek Moszynski, R. Schubart, D. Wolski, M. De Poli, Guntram Pausch, G. de Angelis, D. Hilscher, and H. Grawe

Subjects
Physics, Mass number, Nuclear and High Energy Physics, Proton, business.industry, Cyclotron, Detector, Biasing, Spectral line, law.invention, Ion, Optics, law, Electric field, Atomic physics, Detectors and Experimental Techniques, business, Instrumentation
Abstract

The capability of the pulse-shape technique with reversed n-type Si detectors for discrimination of protons and alphas produced in fusion-evaporation reactions was tested at the VICKSI cyclotron in Berlin. We applied a zero-crossing technique which does not need any external time reference, and which can therefore be exploited at DC accelerators. Excellent proton-alpha discrimination in the full energy range of the evaporation spectra, but also charge and even isotope resolution for heavier ions produced in projectile fragmentation, was obtained with detectors of an existing Si ball. There is no doubt that the pulse-shape discrimination works well with detectors from serial production and under experimental conditions which are typical for nuclear structure studies. An application of this technique in Si detector arrays is obvious, but some special features must be considered in the design of the electronics. The particle discrimination depends strongly on the electric field distribution inside the detector. Stabilization of the bias voltage at the detector is therefore recommended. A consequence of the rear-side injection mode is a strong variation of the charge-collection time with energy, charge, and mass number of the detected ion. To obtain a precise energy signal it is indispensable to correct for the ballistic deficit.

Published
1995

340. Shears bands in 201Pb and 202Pb

Author

R. Schubart, H. Hübel, M. Neffgen, W. Pohler, K. M. Spohr, K. H. Maier, H.J. Maier, P. Maagh, S. Frauendorf, H. Grawe, S. Chmel, G. Baldsiefen, and W. Korten

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Spins, Proton, Condensed matter physics, 010308 nuclear & particles physics, 01 natural sciences, Molecular physics, Dipole, Total angular momentum quantum number, 0103 physical sciences, Angular momentum coupling, Orbital angular momentum of light, Neutron, 010306 general physics
Abstract

High-spin states in 201 Pb and 202 Pb have been investigated using in-beam γ-ray spectroscopic techniques. Seven regular sequences of enhanced dipole transitions, with weak E2 crossovers in some cases, have been found, one of which is firmly connected to low-lying levels in 201 Pb. These bands are interpreted to be built on high-spin proton-particle neutron-hole excitations. Tilted-axis cranking calculations show that the angular momentum along the bands is predominantly generated by a continuous and simultaneous reorientation of the proton and neutron spins into the direction of the total angular momentum (shears effect).

Published
1995

341. Evidence for an isomer in 76 Ni

Author

O. Roig, V. Méot, Ch. Theisen, M. Lewitowicz, E. Dragulescu, D. Verney, G. Bélier, F. Negoita, M. G. Saint-Laurent, H. Grawe, M. Stanoiu, Georgi P. Georgiev, E. Bouchez, J. M. Daugas, F. Becker, C. Stodel, R. Borcea, F. de Oliveira Santos, C. R. Bingham, O. Sorlin, I. Stefan, J. E. Sauvestre, A. Buta, F. Ibrahim, M. Sawicka, J. Giovinazzo, M. Pfützner, K. P. Rykaczewski, I. Matea, P. Mayet, F. Hammache, Robert Grzywacz, and O. Perru

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Spectrometer, Hadron, SHELL model, chemistry.chemical_element, Nuclear physics, Microsecond, Crystallography, Nickel, chemistry, Nuclear fusion, Spectroscopy
Abstract

In the experiment performed at the LISE2000 spectrometer at GANIL neutron-rich nickel isotopes were studied by microsecond isomer spectroscopy. Evidence for an isomer in 76Ni is found, consistently with the shell model prediction of an 8 + state of \(\nu (g_{9/2})^2\) structure.

Published
2003

342. g-factors of isomeric states in the neutron-rich nuclei

Author

P. H. Regan, Nico Coulier, N. A. Smirnova, K. P. Rykaczewski, Robert Grzywacz, F. de Oliveira Santos, Romain Coussement, Stéphanie Teughels, J. M. Daugas, Katrien Vyvey, Michael Hass, Robert Page, I. Matea, M. Sawicka, Gerda Neyens, G. Georgiev, C. Borcea, M. Lewitowicz, Henryk Mach, M. Pfützner, C. R. Bingham, Yu. E. Penionzhkevich, M. Stanoiu, M. Górska, Yu. Sobolev, D. L. Balabanski, H. Grawe, and Zs. Podolyák

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Fragmentation (mass spectrometry), Proton, Nuclear Theory, Hadron, Nuclear fusion, Neutron, Nuclide, Atomic physics, Nuclear Experiment, Excitation
Abstract

We report the results from the first experiment to measure gyromagnetic factors of μs isomers in neutron-rich nuclei produced by intermediate-energy projectile-fragmentation reactions. The Time Dependent Perturbed Angular Distribution (TDPAD) method was applied in combination with the heavy-ion-gamma correlation technique. The nuclides in the vicinity of 68 Ni were produced and spin-oriented following the fragmentation of a 76 Ge, 61.4 MeV/u beam at GANIL. The results obtained, |g|(69m Cu) = 0.225(25) and |g|(67m Ni) = 0.125(6) provide another indication of the importance of proton excitation across the Z = 28 shell gap for the description of these states.

Published
2003

343. [Untitled]

Author

I. Kojouharov, Zs. Podolyák, J. Gerl, N. Kurz, W. Gelletly, M. Górska, M. Kmiecik, Dirk Rudolph, T. Shizuma, H. J. Wollersheim, Alison Bruce, A. Kelic, G. A. Jones, A. B. Garnsworthy, F. G. Kondev, T. Saito, A. Jungclaus, E. Werner-Malento, Piotr Bednarczyk, O. Wieland, T. Kurtukian-Nieto, H. Schaffner, Z. Liu, A. Maj, S. Tachenov, Andreas Martin Heinz, J. Grebosz, L. Caceres, G. Ilie, G. Benzoni, F. Becker, P. Doornenbal, Philip M Walker, F. Camera, S. J. Steer, S. Pietri, P. H. Regan, I. J. Cullen, Fernando Montes, Zs. Dombradi, AJ Simons, W Prokopowicz, E. Estevez, Hans Geissel, S. Schwertel, S. Lalkovski, H. Grawe, C. Brandau, Robert Hoischen, M. Pfuetzner, B. Blank, W. N. Catford, and S. Myalski

Subjects
Physics, Fragmentation (mass spectrometry), 010308 nuclear & particles physics, 0103 physical sciences, Theoretical models, General Physics and Astronomy, Atomic physics, 010303 astronomy & astrophysics, 01 natural sciences
Abstract

We have investigated nuclear fragmentation reactions of a relativistic Pb-208 beam. Ten isomeric states for nuclei with A = 142-152 and Z = 62-67 were observed. Measured isomeric ratios were compared, together with values from other experiments, with prediction of theoretical models. The discrepancies between the experimental and theoretical values were discussed in terms of transitions by-passing the isomer that are not included in the models.

Published
2012

344. Erratum to 'Beta decay of 56Cu'

Author

J. Döring, Heikki Penttilä, M. Sawicka, M. Górska, C. Schlegel, A. Płochocki, Z. Janas, A. Nieminen, M. Rejmund, Margareta Hellström, R. Kirchner, Ari Jokinen, R. Borcea, M. Gierlik, F. Nowacki, P. Mayet, M. La Commara, E. Roeckl, Gabriel Martínez-Pinedo, Karlheinz Langanke, E. Caurier, M. Karny, H. Grawe, Ronald Schwengner, K.-H. Schmidt, Peter Dendooven, and Juha Äystö

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Beta decay
Published
2002

345. Isomer andβ-decay spectroscopy of Tz=1 isotopes below the N=Z=50 shell gap

Author

R. Krücken, R. Wadsworth, Robert Hoischen, Zhi Liu, A. Gottardo, P. H. Regan, F. Farinon, Sami Rinta-Antila, Johan Nyberg, H. Schaffner, J. Gerl, B. S. Nara Singh, Navneet Goel, F. Finke, P. Boutachkov, N. Warr, H. Grawe, N. Kurz, M. Górska, P. Reiter, N. Braun, G. Ilie, T. Faestermann, I. Kojuharov, H. Iwasaki, C. Scholl, C. Domingo-Pardo, Helmut Weick, Zs. Podolyák, P. J. Woods, S. Pietri, Tina Penick Brock, C. Nociforo, A. Blazhev, L. Bettermann, K. Geibel, J. Jolie, Dirk Rudolph, L. Caceres, A. Prochazka, J. Grebosz, A. Atac, S. J. Steer, E. Merchan, H. J. Wollersheim, C. Hinke, M. Pfützner, K. Eppinger, P. A. Söderström, and T. Engert

Subjects
History, Crystallography, Isotope, Chemistry, Shell (structure), Atomic physics, Spectroscopy, Spin (physics), Computer Science Applications, Education, Preliminary analysis
Abstract

The RISING setup at the GSI-FRS facility was used to investigate the isomer and beta decays in N~Z~50 Cd, Ag and Pd isotopes. A preliminary analysis of the data has revealed new results on the Tz=1, 94Pd, 96Ag and 98Cd isotopes. In 94Pd a new high-spin isomer was observed, whilst in 96Ag 3 new isomeric states were identified, including core-excited states. In 98Cd a new high-energy isomeric γ-ray transition is observed, thus enabling us to confirm the previous spin assignment for the core-excited 12+ isomer.

Published
2011

346. [Untitled]

Author

Soma Mukherjee, Akhil Jhingan, S. Muralithar, Andreas Ekström, M. Górska, W. Prokopowicz, P. Reiter, R. B. Garg, H. J. Wollersheim, Davinder Siwal, S. K. Mandal, P. Doornenbal, Rajesh Kumar, Jasmeet Kaur, Ravi Pratap Singh, Pushpendra Singh, Joakim Cederkäll, H. Schaffner, S. Appannababu, J. Gerl, L. Caceres, I. Kojouharov, R. K. Bhowmik, A. Sharma, H. Grawe, and Piotr Bednarczyk

Subjects
Physics, Systematic error, Ion beam, Transition strength, Isotopes of tin, Analytical chemistry, General Physics and Astronomy, Coulomb excitation, Atomic physics
Abstract

The poorly known B(E2; 0(+) -> 2(+)) values of Sn-112 and Sn-114 have been measured to high precision. Two Coulomb excitation experiments were performed to determine the reduced transition probabilities relative to Sn-116 in order to minimize the systematic errors. The obtained B(E2 up arrow) values of 0.242(8) e(2)b(2) for Sn-112 and 0.232(8) e(2)b(2) for Sn-114 confirm the tendency of large B(E2 up arrow) values for the lighter tin isotopes below the midshell Sn-116 that has been observed recently in various radioactive ion beam experiments.

Published
2011

347. Dipole cascades in $^{194}$Pb

Author

C.X. Yang, D. Mehta, D. B. Fossan, K. Theine, W. Korten, K. H. Maier, H. Grawe, H. Kluge, P. Willsau, H. Hübel, F. Hannachi, W. Schmitz, 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, Nuclear and High Energy Physics, Dipole, Spectrometer, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, Nuclear fusion, Elementary particle, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

Excited states in194Pb, populated in the158Gd(40Ar,4n) reaction, were investigated using the OSIRIS γ-ray spectrometer array. The previously known level scheme is revised and substantially extended. Four cascades of dipole transitions are discussed.

Published
1993

348. g -factor measurements at RISING: The cases of \chem{{}^{127}Sn} and \chem{{}^{128}Sn}

Author

A. Jungclaus, M. Ionescu-Bujor, S. Pietri, M. Kmiecik, M. Hjorth-Jensen, M. Pfützner, O. Wieland, C. Brandau, L. Caceres, Georgi P. Georgiev, A. Iordachescu, N. Blasi, G. Lo Bianco, Gerda Neyens, E. Werner-Malento, A. Saltarelli, R. Lozeva, E. Farnea, G. Rusev, Robert Hoischen, L. Atanasova, J. Walker, A. Bracco, P. Detistov, Claes Fahlander, M. Hass, G. Benzoni, H. Schaffner, T. Saito, W. Prokopowicz, Stanislav Tashenov, F. C. L. Crespi, S. Lakshmi, G. Ilie, N. Kurz, Dirk Rudolph, J. Grebosz, D. L. Balabanski, J. J. Valiente-Dobón, D. Montanari, F. Camera, A. Blazhev, S. K. Chamoli, H. J. Wollersheim, Piotr Bednarczyk, Ronald Schwengner, K. A. Gladnishki, I. Kojouharov, G. S. Simpson, P. Doornenbal, A. Maj, F. Becker, D. Bazzacco, N. Vermeulen, H. Grawe, M. Górska, Zs. Podolyák, and J. Gerl

Subjects
Physics, Spectrometer, Fragmentation (mass spectrometry), 010308 nuclear & particles physics, 0103 physical sciences, SHELL model, General Physics and Astronomy, Atomic physics, 010306 general physics, 01 natural sciences
Abstract

We report on g-factor measurements of the 19/2+ T1/2=4.5(3) μs isomer in 127Sn and the 10+ T1/2=2.69(23) μs isomer in 128Sn. These isomers were produced and spin-aligned in relativistic heavy-ion fragmentation at GSI and were selected and separated by the GSI fragment separator (FRS). The γ-rays of the isomeric decay were detected by the RISING γ-ray spectrometer. The method of time-differential perturbed angular distributions was utilized. The measured g-factors, g(19/2+; 127Sn)=− 0.17(2) and g(10+; 128Sn)=− 0.20(4), are compared with shell model calculations. The measured g-factors confirm the predominantly νh11/2− 2 and ν(s1/2− 1h11/2−2) character of the 10+ and 19/2− isomers in 128Sn and 127Sn, respectively. The results demonstrate the feasibility of the method for similar measurements in exotic neutron-rich nuclei.

Published
2010

349. High-energy excited states in98Cd

Author

A. Atac, S. J. Steer, I. Kojouharov, Dirk Rudolph, J. Grȩbosz, H. J. Wollersheim, L. Caceres, Johan Nyberg, C. Domingo-Pardo, Helmut Weick, C. Hinke, Tina Penick Brock, Frédéric Nowacki, T. Engert, P. Reiter, H. Iwasaki, R. Wadsworth, K. Eppinger, P. J. Woods, Zs. Podolyák, J. Gerl, A. Prochazka, M. Górska, T. Faestermann, P. A. Söderström, P. H. Regan, S. Pietri, E. Merchan, N. Braun, C. Nociforo, A. Blazhev, J. Jolie, B. S. Nara Singh, F. Finke, H. Grawe, N. Kurz, G. Ilie, H. Schaffner, F. Farinon, P. Boutachkov, L. Bettermann, N. Goel, K. Geibel, Zh Liu, Sami Rinta-Antila, M. Pfützner, N. Warr, Robert Hoischen, A. Gottardo, R. Krücken, and C. Scholl

Subjects
Physics, Nuclear physics, History, High energy, Excited state, Physics::Atomic and Molecular Clusters, Nuclear structure, Atomic physics, Computer Science Applications, Education
Abstract

In 98Cd a new high-energy isomeric γ-ray transition was identified, which confirms previous spin-parity assignments and enables for the first time the measurement of the E2 and E4 strength for the two decay branches of the isomer. Preliminary results on the 98Cd high-excitation level scheme are presented. A comparison to shell-model calculations as well as implications for the nuclear structure around 100Sn are discussed.

Published
2010

350. Mixtures of molten metals and graphite as targets for on-line mass separators

Author

E. Hagebø, H. Grawe, K. Steffensen, H. Haas, S. Sundeil, R. Eder, H. Andreasen, H.L. Ravn, and P. Hoff

Subjects
Nuclear and High Energy Physics, Materials science, Radiochemistry, Analytical chemistry, chemistry.chemical_element, Accelerators and Storage Rings, Carbide, Isotope separation, law.invention, Transition metal, chemistry, law, Melting point, Neutron, Graphite, Platinum, Instrumentation, Carbon
Abstract

Targets consisting of fine-grained powders of graphite and metals which do not form thermostable carbides have been investigated. The targets were heated to temperatures well above the melting point of the respective metals. A target of Pt powder mixed with graphite powder is found to be suitable for production of neutron deficient Au isotopes, when irradiated with 910 MeV 3He projectiles. The yields of neutron deficient Cd isotopes from a target of Sn powder mixed with graphite powder are also reported.

Published
1991

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