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19 results on '"C.D. O'Leary"'

1. $\alpha$ -decay spectroscopy of light odd-odd Bi isotopes - I: 188,190Bi nuclei

Author

S. Saro, C. Moore, P. Van Duppen, S. Hofmann, Birgit Kindler, A. Lavrentiev, M. Matos, Dieter Ackermann, A. Kleinböhl, H. Schaffner, P. Cagarda, S. Reshitko, J. Gerl, C. Schlegel, K. Van de Vel, D. Karlgren, Mark Huyse, Kristiaan Heyde, R. D. Page, I. Kojouharov, A. Keenan, H. J. Boardman, C.D. O'Leary, Andrei Andreyev, G. Münzenberg, F. P. Heßberger, Bettina Lommel, Michael Taylor, L. Weissman, Matti Leino, S. Antalic, and Heikki Kettunen

Subjects
Nuclear physics, Excitation function, Physics, Nuclear and High Energy Physics, Recoil, Excited state, Hadron, Nuclear fusion, Neutron, Alpha decay, Atomic physics, Nuclear Experiment, Spectroscopy
Abstract

Detailed fine-structure $\alpha$ -decay studies of 188,190Bi were performed using the complete-fusion reactions of 50,52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of recoil- $\alpha$ , recoil- $\alpha$ - $\gamma$ /X-ray and excitation function measurements. Improved data on the $\alpha$ -decay of 188,190Bi were obtained and a number of new low-lying excited states in the daughters 184,186Tl were observed. An intruder, presumably 10- state was identified in 184Tl, extending the systematics of such states in the odd-odd Tl nuclei beyond the neutron mid-shell at N = 104. Some technical aspects of experiment at recoil separators are also discussed.

Published
2003

2. In-beam studies of very neutron-deficient heavy nuclei

Author

D. T. Joss, N. S. Kelsall, C. Moore, K. Helariutta, A. N. Andreyev, Heikki Kettunen, W. Korten, P. Van Duppen, S. Juutinen, M. Muikku, Y. Le Coz, Marc Huyse, Peter M. Jones, A. Keenan, M. Leino, H. Kankaanpää, C.D. O'Leary, Pasi Kuusiniemi, A.-P. Leppänen, S.J. Williams, D. G. Jenkins, K. Van de Vel, Panu Rahkila, R. Julin, Janne Pakarinen, Michael Taylor, Juha Uusitalo, A Hurstel, Paul Greenlees, Robert Page, R. Wadsworth, K. Hauschild, Paivi Nieminen, M. B. Smith, and W. Reviol

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Proton, Physics::Instrumentation and Detectors, Yrast, Hadron, Solenoid, Nuclear physics, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, Beam (structure)
Abstract

The JYFL gas-filled recoil separator RITU, combined with Ge detector arrays and a SACRED magnetic solenoid spectrometer, has been successfully employed in recoil-decay-tagging (RDT) experiments in order to probe structures of very neutron-deficient heavy nuclei. The present contribution focuses on the light Pb region where the new data extend the systematics of shape-coexisting yrast states towards the proton dripline. Similarities between band structures and their relation to possible multi-particle multi-hole intruder excitations will be discussed.

Published
2002

3. g-factors of isomers around N≈40, Z≈28 from time-dependent Larmor precession on spin-aligned projectile-like fragments

Author

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

Subjects
Physics, Larmor precession, Nuclear and High Energy Physics, Future studies, Fragmentation (mass spectrometry), Projectile, Time windows, Gyromagnetic ratio, Nuclear structure, Atomic physics, Ion
Abstract

First and preliminary results of an experiment aimed at measuring g -factors of isomeric states in neutron-rich nuclei in the vicinity of 68 Ni are reported. Isomers near the predicted N =40 sub-shell closure in 69 Cu, 67 Ni and 66 Co have been populated in the fragmentation of a 76 Ge, 61.4 MeV/u beam onto a 145 mg/cm 2 9 Be target at GANIL. Here we report the results for the 357(2) ns, I π =13/2 + isomer in 69 Cu for which a preliminary gyromagnetic ratio of | g |=0.195(9) was derived. The Larmor precession of the spin-oriented isomeric ensemble was measured by recording γ –ion correlations in a 20 μs time window. This pioneering experiment has indicated interesting nuclear structure information and shows promising possibilities for future studies of this kind.

Published
2002

4. Mirror symmetry and Coulomb effects in light N≈Z nuclei

Author

C. J. Lister, SM Vincent, Gabriel Martínez-Pinedo, D. Seweryniak, M. P. Carpenter, Berta Rubio, M. A. Bentley, P. Fallon, Alison Bruce, J. Sanchez-Solano, P. Reiter, L. Frankland, S. J. Williams, W. Gelletly, P. H. Regan, J. A. Cameron, D. D. Warner, C.D. O'Leary, D. T. Joss, Alfredo Poves, and C. E. Svensson

Subjects
Physics, Angular momentum, Spin states, Isospin, Excited state, Nuclear Theory, Coulomb, Nuclear structure, General Physics and Astronomy, Coulomb barrier, Atomic physics, Spin (physics)
Abstract

In this overview, some latest results from gamma-ray spectroscopic studies of high spin states of isobaric multiplets will be presented. An experimental programme is underway to examine exited states of isobaric multiplets of total isospin T=1/2 and T=1 and the comparison of energies of excited states can be interpreted in terms of Coulomb effects. Through a systematic study of these Coulomb effects, and through examination of the calculated Coulomb energies from full pf-shell model calculations, it is now becoming clear that measurement of Coulomb energies can yield very detailed information on the evolution of nuclear structure phenomena as a function of energy and angular momentum. In this contribution, latest results of studies of isobaric analogue states at high spin in the A=50, 51 and 53 systems will be presented.

Published
2002

5. Measurement of the g factors of isomers near the proposed N ≈ 40 subshell closure

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Angular distribution, Isotope, g factor, Closure (topology), Atomic physics, Nuclear Experiment, Measure (mathematics), Projectile fragmentation, Atomic and Molecular Physics, and Optics
Abstract

We report results from a pioneering experiment to measure the g factors of isomeric states of neutron-rich nuclei around 68Ni, far from the valley of β stability.For the first time, the time-dependent perturbed angular distribution method was applied in combination with the heavy-ion-γ correlation technique to study g factors of spin-aligned isomers produced in a projectile fragmentation reaction and mass-separated. Some technical aspects are discussed and illustrated with preliminary results.

Published
2001

6. New microsecond isomers in 189, 190Bi

Author

Dieter Ackermann, H. Schaffner, P. Van Duppen, C.D. O'Leary, Andrei Andreyev, G. Münzenberg, S. Saro, F. P. Heßberger, S. Reshitko, J. Gerl, Bettina Lommel, Michael Taylor, P. Cagarda, S. Hofmann, A. Lavrentiev, A. Keenan, M. Matos, R. D. Page, Marc Huyse, Matti Leino, L. Weissman, Ramon Wyss, Heikki Kettunen, A. Kleinböhl, C. Moore, and C. Schlegel

Subjects
Physics, Excitation function, Nuclear and High Energy Physics, Microsecond, Excited state, Hadron, Analytical chemistry, Nuclear fusion, Alpha decay, Atomic physics, Nuclear Experiment, Radioactive decay, Spectral line
Abstract

New microsecond isomers in the neutron-deficient isotopes 189g, 190Bi have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil-γ/X-ray, recoil-γ/X-ray-α and excitation function measurements. The systematics of the [ π1i 13/2]13/2+ excited states in the odd-mass Bi nuclei is discussed.

Published
2001

7. The discovery of a prolate–oblate–spherical shape triple of spin 0+ states in the atomic nucleus 186Pb

Author

S. Saro, P. Van Duppen, J. Gerl, A. Keenan, C. Schlegel, S. Hofmann, Kristiaan Heyde, R. D. Page, M. Leino, M. Matos, H. Schaffner, G. Münzenberg, S. Reschitko, P. Cagarda, Dieter Ackermann, C.D. O'Leary, Ramon Wyss, Leonid Weissman, F. P. Heßberger, A. Kleinböhl, A. Lavrentiev, Heikki Kettunen, Michael Taylor, C. Moore, Marc Huyse, and A. N. Andreyev

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Excited state, Oblate spheroid, Atomic nucleus, Particle, Alpha decay, Electron, Atomic physics, Spin (physics)
Abstract

Two excited J(pi)=0(+) states in Pb-186 populated in the a-decay of Po-190 have been identified through alpha -particle/conversion electron coincidences in an experiment at the velocity filter SHIP ...

Published
2001

8. Alpha decay of the new isotopes 188,189Po

Author

Michael Taylor, S. Reshitko, P. Cagarda, Ch. Schlegel, Marc Huyse, Matti Leino, R. D. Page, Heikki Kettunen, L. Weissman, J. Gerl, C.D. O'Leary, A. Kleinböhl, S. Saro, S. Hofmann, Andrei Andreyev, M. Matos, G. Münzenberg, H. Schaffner, Ramon Wyss, C. Moore, Bettina Lommel, P. Van Duppen, Dieter Ackermann, A. Keenan, F. P. Heßberger, and A. Lavrentiev

Subjects
Physics, Nuclear and High Energy Physics, Isotope, chemistry, Hadron, Nuclear fusion, chemistry.chemical_element, Alpha decay, Electron, Atomic physics, Ground state, Polonium, Ion
Abstract

New neutron-deficient isotopes 188,189Po have been produced in the complete fusion reaction of 52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of α-γ and α-conversion electron coincidence measurements and of α-α position and time correlations. In 189Po a ground state to ground state α decay with Eα1= 7540(20) keV, T1/2= 5(1) ms and two fine structure α-decays at Eα2= 7264(15) keV and Eα3= 7316(15) keV have been observed. In 188Po (T1/2= 400+200 −150μs) a ground state to ground state α decay at Eα= 7915(25) keV and a fine structure α decay at Eα= 7350(40) keV have been found. Improved data on the α-decay of 189Bi were obtained.

Published
1999

9. Gamma-ray spectroscopy of 25 57 Mn32 and 25 58 Mn33

Author

C. E. Svensson, G. C. Ball, D. E. Appelbe, Daniel Ward, T.E. Drake, A. Melarangi, J. A. Cameron, Stephane Flibotte, Rae Austin, J. C. Waddington, B. Djerroud, and C.D. O'Leary

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spectrometer, Nucleosynthesis, Excited state, Hadron, Nuclear fusion, Gamma spectroscopy, Atomic physics, Spectral line
Abstract

The decays of 25 57 Mn32 and 25 58 Mn33 have been studied with the 8π Spectrometer following the reaction 48Ca(13C,pxn)60 − x Mn at a beam energy of 40 MeV. The level schemes of these two nuclei have been extended, and the multipolarities of the observed transitions have been determined.

Published
2000

10. Isomers in neutron-rich A approx 190 nuclides from 208Pb fragmentation

Author

K. Schmidt, Henryk Mach, J. Benlliure, M. Sawicka, C. Wheldon, D. D. Warner, Alison Bruce, M Rejmund, O. Yordanov, Philip M Walker, JG Narro, J. Giovinazzo, DC Gil, F. Vivés, Hans Geissel, C Fox, K. H. Schmidt, W. Gelletly, D. M. Cullen, Paul Stevenson, H. J. Wollersheim, Milena Mineva, Ani Aprahamian, P. H. Regan, W. Korten, Margareta Hellström, F {Rejmund}, J. Döring, F. de Oliveira, H. Grawe, C.D. O'Leary, S. C. Wooding, C. J. Pearson, M. Pfützner, A Kleinbohl, Robert Grzywacz, P. A. Butler, R. Lucas, T. Enqvist, P. Mayet, M. Lewitowicz, Zs. Podolyák, J. Gerl, Ch. Theisen, M. Górska, C Schlegel, H. Schaffner, M. Caamaño, Furong Xu, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), 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), 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), 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), 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, Spectrometer, Isotope, 010308 nuclear & particles physics, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Nuclear physics, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Neutron, Nuclide, Atomic physics, 010306 general physics, 21.10.Tg - Lifetimes. 23.20.Lv - γ transitions and level energies. 25.70.Mn - Projectile and target fragmentation
Abstract

Relativistic projectile fragmentation of Pb-208 has been used to produce isomers in neutron-rich, A approximate to 190 nuclides. A forward-focusing spectrometer provided ion-by-ion mass and charge identification. The detection of gamma-rays emitted by stopped ions has led to the assignment of isomers in Ta-188, W-190, Re-192, Re-193, Os-195, Ir-197, Ir-198, Pt-200, Pt-201, Pt-202 and Au-203, with half-lives ranging from approximately 10 ns to 1 ms. Tentative isomer information has been found also for Er-174, Er-175, Hf-185, Re-191, Re-194 and Ir-199. In most cases, time-correlated, singles gamma-ray events provided the first spectroscopic data on excited states for each nuclide. In Pt-200 and Pt-201. the assignments are supported by gamma-gamma coincidences. Isomeric ratios provide additional information, such as half-life and transition energy constraints in particular cases. The level structures of the platinum isotopes are discussed, and comparisons are made with isomer systematics.

Published
2005

11. Probing intruder structures in lead nuclei

Author

D. T. Joss, P. Cagarda, Pasi Kuusiniemi, Stefan G. Hofmann, A. Kleinböhl, P. Rahkila, R. Julin, Peter M. Jones, Marc Huyse, S. Reshitko, J. Gerl, Ramon Wyss, L. Weissman, Kristiaan Heyde, R. D. Page, A. Lavrentiev, Juha Uusitalo, C. Moore, Heikki Kettunen, C. Wheldon, K. Van de Vel, Paul Greenlees, C.D. O'Leary, Andrei Andreyev, G. Münzenberg, Michael Taylor, C. Scholey, C. Schlegel, Matti Leino, M. Matos, H. Schaffner, F. P. Heßberger, A. Keenan, Paivi Nieminen, S. Juutinen, M. Muikku, D. Ackerman, K. J. Eskola, P. Van Duppen, H. Kankaanpää, and A. Melarangi

Subjects
Physics, 010308 nuclear & particles physics, Yrast, chemistry.chemical_element, 01 natural sciences, Nuclear physics, Complementary experiments, Lead (geology), chemistry, 0103 physical sciences, 010306 general physics, Spectroscopy, Mixing (physics), Polonium
Abstract

In-beam γ-ray spectroscopy measurements provide important information on coexisting normal and intruder configurations in lead nuclei. However, in these experiments the yrast states are preferentially populated so that in many cases nothing is known about non-yrast states that are essential for obtaining a fuller understanding. Complementary experiments designed to study fine structure in the a decays of polonium nuclei have led to the discovery of low-spin non-yrast states in the daughter lead nuclei, while higher-spin states can be identified through the γ decays of isomeric states. The α-decay studies have the additional benefit of allowing information on configuration mixing in the polonium parents to be deduced from the measured hindrance factors.

Published
2003

12. Isovector Pairing in Odd-Odd N=Z 50Mn

Author

C. J. Lister, W. Gelletly, C. E. Svensson, D. T. Joss, J. A. Cameron, SM Vincent, L. Frankland, D. Seweryniak, Gabriel Martínez-Pinedo, C.D. O'Leary, D. D. Warner, Alison Bruce, Berta Rubio, P. Fallon, R. V. F. Janssens, P. Reiter, S. J. Williams, M. P. Carpenter, M. A. Bentley, C. N. Davids, P. H. Regan, and S. M. Lenzi

Subjects
Physics, Nuclear and High Energy Physics, Isovector, Yrast, Electric potential energy, Gamma rays, Nuclear Theory, Gamma ray, Neutron–proton pairing, Shell model, medicine.anatomical_structure, Pairing, Isospin, High spin, Isobar, medicine, Atomic physics, Nuclear Experiment, Nucleus
Abstract

High-spin states in the odd–odd N=Z nucleus 5025Mn have been investigated. A sequence of states up to Jπ=6+ has been assigned as the T=1 analogue of the yrast band in 5024Cr for the first time. The differences in energy between levels in these bands are interpreted in terms of rotational alignments and the effect they have on the Coulomb energy of the nucleus. Comparisons with shell model calculations show that the Coulomb energy difference between the T=1 analogue structures is an important indicator of the competition between isovector pairing modes in N=Z nuclei and their isobars.

Published
2002

13. THE DISCOVERY OF A PROLATE-OBLATE-SPHERICAL SHAPE TRIPLET OF SPIN 0+ STATES IN THE ATOMIC NUCLEUS 186<font>PB</font>

Author

Ramon Wyss, Leonid Weissman, F. P. Heβberger, M. Leino, P. Cagarda, Heikki Kettunen, A. Lavrentiev, Kristiaan Heyde, R. D. Page, S. Saro, J. Gerl, A. N. Andreyev, C. Schlegel, Stefan G. Hofmann, A. Kleinböhl, C.D. O'Leary, S. Reshitko, Milan Matos, G. Münzenberg, Dieter Ackermann, H. Schaffner, Marc Huyse, C. Moore, P. Van Van Duppen, A. Keenan, and Michael Taylor

Subjects
Physics, Oblate spheroid, Atomic nucleus, Prolate spheroid, Atomic physics, Spin (physics)
Published
2001

14. Mirror symmetry at high spin in51Feand51Mn

Author

W. Gelletly, P. Reiter, SM Vincent, S.J. Williams, D. Seweryniak, D. T. Joss, P. H. Regan, P. Fallon, C. J. Lister, Gabriel Martínez-Pinedo, M. P. Carpenter, C. E. Svensson, L. Frankland, M. A. Bentley, J. Sanchez Solano, Alison Bruce, C.D. O'Leary, D. D. Warner, Alfredo Poves, B. Rubio, and J. A. Cameron

Subjects
Physics, Nuclear and High Energy Physics, Excited state, Electric potential energy, Gamma ray, Coulomb, Atomic physics, Mirror symmetry, Symmetry (physics), Excitation, Spin-½
Abstract

Gamma decays from excited states in the ${T}_{z}=\ensuremath{-}\frac{1}{2}$ nucleus ${}^{51}$Fe have been observed for the first time. The differences in excitation energies as compared with those of the mirror partner, ${}^{51}$Mn, have been interpreted in terms of Coulomb effects and the resulting Coulomb energy differences (CED) can be understood intuitively in terms of particle-alignment effects. A new CED effect has been observed, in which different CED trends have been measured for each signature of the rotational structures that characterize these mid-${f}_{7/2}$ shell nuclei. Large-scale $\mathrm{fp}$-shell model calculations have been used to compute the trends of the CED as a function of spin. The result of comparing these calculations with the data demonstrates an ability to reproduce the fine details of the Coulomb effects with a precision far greater than has been previously achieved.

Published
2000

15. First observation of excited states in182Pb

Author

R. D. Page, S. Juutinen, W. Reviol, M. Muikku, N. S. Kelsall, Michael Taylor, K. Helariutta, Matti Leino, Heikki Kettunen, Juha Uusitalo, C. Moore, Paivi Nieminen, Pasi Kuusiniemi, P. Rakhila, R. Wadsworth, R. Julin, K. Hauschild, H. Kankaanpää, D. G. Jenkins, C.D. O'Leary, Paul Greenlees, and Peter M. Jones

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Excited state, Alpha decay, Atomic physics
Published
2000

16. Deformed rotational cascades in152Dy: Further evidence for shape coexistence at high spin

Author

B. Haas, D. M. Cullen, C. Rigollet, J.C. Lisle, P.J. Dagnall, G. Duchêne, F.A. Beck, C.D. O'Leary, D. Appelbe, J. Simpson, B. M. Nyakó, H. Savajols, Ch. Finck, K. Zuber, C. W. Beausang, I. M. Hibbert, O. Stézowski, S. Erturk, J. Styczen, D. Curien, P.J. Twin, J. P. Vivien, M. A. Bentley, and M. B. Smith

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Attenuation, Gamma ray, 01 natural sciences, medicine.anatomical_structure, Atomic orbital, Cascade, 0103 physical sciences, Quadrupole, medicine, Atomic physics, 010306 general physics, Spin (physics), Nucleus, Line (formation)
Abstract

Two new rotational bands have been observed in the Dy-152 nucleus following experiments performed using the EUROGAM gamma-ray spectrometer. Several transitions have been observed that link these new bands into the known single-particle states. Using the Doppler shift attenuation method, the quadrupole moment of the previously-known rotational sequence has been measured. The value of Q(band) = 3.85+/-0.06 e b confirms the deformed nature of this cascade. The structures of the three bands are discussed in terms of the occupation of both paired and unpaired orbitals, and are found to be in good agreement with theoretical calculations. The observation of two new bands further extends the concept of shape coexistence in the Dy-152 nucleus.

Published
2000

17. 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

18. Probing the structure of the

Author

C. J. Lister, J. Simpson, D. J. Henderson, C.D. O'Leary, R. V. F. Janssens, P. H. Regan, SM Vincent, D. D. Warner, T. Saitoh, D. Nisius, C. N. Davids, W. Gelletly, M. Carpenter, C. J. Pearson, D. J. Blumenthal, R.A. Bark, D. Seweryniak, S. Törmänen, and J. Schwartz

Subjects
Physics, Decay scheme, Excited state, Nuclear structure, Gamma ray, Neutron, Atomic physics, Ground state, Spin (physics), Radioactive decay
Abstract

The decay scheme of the N=Z odd-odd nucleus, 62Ga has been deduced for the first time using the reactions 40Ca(24Mg,pn)62Ga and 40Ca(28Si,αpn)62Ga at beam energies of 65 MeV and 88 MeV respectively. Transitions from excited states in 62Ga were identified using the PEX apparatus at the Niels Bohr Institute Tandem Accelerator Laboratory. Gamma ray angular correlation data collected using the AYEBALL array at the Argonne National Laboratory are consistent with a cascade of stretched E2 transitions which decay from a spin 1+ bandhead via a pure magnetic dipole decay, directly linking a proposed T=0 structure with the T=1, Jπ=0+ ground state.

Published
1998

19. K-isomers in very neutron-rich nuclei around mass 180

Author

Robert Grzywacz, W. Korten, F. de Oliveira, W. Gelletly, H. J. Wollersheim, D. M. Cullen, JG Narro, D. D. Warner, J. Döring, Magnus Hellström, Ani Aprahamian, C.D. O'Leary, T Enquist, Henryk Mach, H. Grawe, M. Sawicka, M. Rejmund, S. C. Wooding, Ch. Theisen, M. Lewitowicz, J. Benlliure, E Farget, J. Giovinazzo, M. Górska, P. A. Butler, Alison Bruce, P. H. Regan, C. Wheldon, C. J. Pearson, H. Schaffner, Milena Mineva, Zs. Podolyák, J. Gerl, C. Fox, DC Gil, M. Caamaño, Furong Xu, R. Lucas, C. Schlegel, K.-H. Schmidt, A. Kleinböhl, M. Pfützner, P. Mayet, Philip M Walker, Lion, Michel, 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, education.field_of_study, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Population, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Microsecond, Fragmentation (mass spectrometry), 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, education, Nucleon, Ground state, Mathematical Physics
Abstract

gamma-spectroscopy methods have been used to search for microsecond isomers among the fragmentation products of a 1 GeV/nucleon Pb-208 beam. In particular the population of the known K-pi = 35/2(-) isomer in W-179 has been investigated and several new isomeric decays have been found for neutron rich nuclei in the A approximate to 180-200 mass region. The ground state band of the neutron rich N = 116 system of W-190 has been identified for the first time and we discuss its structure in comparison to neighboring systems.

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