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8 results on '"Janne Pakarinen"'

1. Evidence of oblate-prolate shape coexistence in the strongly-deformed nucleus 119Cs

Author

T. Grahn, Bo Cederwall, D. Sohler, G. Zimba, K.K. Zheng, Paul Greenlees, Jan Sarén, C. M. Petrache, W.Q. Zhang, S. Juutinen, R. Julin, R. D. Page, M. L. Liu, István Kuti, M. Doncel, Pengwei Zhao, H. Tann, M. Luoma, A. Ertoprak, B. F. Lv, J. Ojala, Jari Partanen, Janne Pakarinen, Y.K. Wang, O. Aktas, B. M. Nyakó, Song Guo, János Timár, Z. H. Zhang, D. T. Joss, Corina Andreoiu, A. Astier, Panu Ruotsalainen, Juha Uusitalo, P. Rahkila, Mikael Sandzelius, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
58Ni(64Zn,3p)119Cs, Nuclear reaction, Nuclear and High Energy Physics, QC1-999, Nuclear Theory, Model calculation, coincidences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, Measured γγγ-coincidences, cesium, 0103 physical sciences, medicine, Nuclear reaction:58Ni(64Zn,3p)119Cs, Zn, Covariant transformation, Cs, 010306 general physics, Spin (physics), Ni(, Physics, Linear polarization, 010308 nuclear & particles physics, Degenerate energy levels, 3p), Oblate-prolate coexistence, medicine.anatomical_structure, Angular correlations, Density functional theory, ydinfysiikka, Ground state, Measured, Nucleus
Abstract

International audience; Prolate-oblate shape coexistence close to the ground state in the strongly-deformed proton-rich A≈120 nuclei is reported for the first time. One of the four reported bands in 119Cs, built on a 11/2− state at 670 keV, consists of nearly degenerate signature partners, and has properties which unequivocally indicate the strongly-coupled πh11/2[505]11/2− configuration associated with oblate shape. Together with the decoupled πh11/2[541]3/2− band built on the 11/2− prolate state at 110 keV, for which a half-life of T1/2=55(5)μs has been measured, the new bands bring evidence of shape coexistence at low spin in the proton-rich strongly deformed A≈120 nuclei, a phenomenon predicted since long time, but not yet observed. Calculations using the particle-number conserving cranked shell model and two dimensional tilted axis cranking covariant density functional theory support and well reproduce the observed oblate and prolate coexisting low-energy states in 119Cs.

Published
2021

2. Spectroscopic factor and proton formation probability for the d3/2 proton emitter 151Lu

Author

D. T. Joss, I. J. Cullen, W.Q. Zhang, Sarah Eeckhaudt, T. Shizuma, A. Kishada, Hong-Fei Zhang, Jan Sarén, S. F. Ashley, Sakari Juutinen, P. Jones, L. Bianco, Rauno Julin, Susan Rigby, S. Khan, Iain Darby, M. Nyman, N. J. Thompson, Paul Greenlees, Chong Qi, F. Wang, Tuomas Grahn, W. Gelletly, Megumi Niikura, Philip M Walker, S. J. Steer, Catherine Scholey, S. Pietri, A. B. Garnsworthy, D. G. Jenkins, Juha Uusitalo, Zhi Liu, Juha Sorri, Robert Page, M. B. Gómez-Hornillos, Steffen Ketelhut, Janne Pakarinen, Bao-Hua Sun, Steven Williams, Matti Leino, Panu Rahkila, J. Thomson, Zsolt Podolyak, G. A. Jones, and L. H. Zhu

Subjects
Nuclear and High Energy Physics, Work (thermodynamics), Nuclear Theory, Proton, Proton decay, FOS: Physical sciences, Proton energy, 01 natural sciences, proton emitter, WKB approximation, Nuclear Theory (nucl-th), Nuclear physics, A=151, 0103 physical sciences, recoil-decay tagging, ddc:530, Nuclear Experiment (nucl-ex), spectroscopic factor, Proton emission, Nuclear Experiment, 010306 general physics, Common emitter, Physics, Quenching (fluorescence), ta114, 010308 nuclear & particles physics, Spectroscopic factor, Proton emitter, proton formation probability, lcsh:QC1-999, Proton formation probability, 3. Good health, Recoil-decay tagging, Atomic physics, lcsh:Physics
Abstract

The quenching of the experimental spectroscopic factor for proton emission from the short-lived $d_{3/2}$ isomeric state in $^{151m}$Lu was a long-standing problem. In the present work, proton emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyv\"{a}skyl\"{a}. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15.4(8) $\mu$s, respectively, in agreement with another recent study. These new experimental data can resolve the discrepancy in the spectroscopic factor calculated using the spherical WKB approximation. Using the R-matrix approach it is found that the proton formation probability indicates no significant hindrance for the proton decay of $^{151m}$Lu., Comment: 6 pages, 5 figures

Published
2017

3. Spectroscopy at the two-proton drip line: Excited states in 158W

Author

Bo Cederwall, Mikael Sandzelius, Andrej Herzan, Rauno Julin, Baharak Hadinia, Iain Darby, D. Seweryniak, Raymond J. Carroll, Sakari Juutinen, D. T. Joss, Tuomas Grahn, Matti Leino, L. Donosa, May Nyman, David O'Donnell, Peter B. Jones, Robert Page, Juha Uusitalo, Catherine Scholey, J. Simpson, Ulrika Jakobsson, Juha Sorri, Janne Pakarinen, Panu Rahkila, Sarah Eeckhaudt, Jan Sarén, K. Andgren, Paul Greenlees, and A.-P. Leppänen

Subjects
Physics, Nuclear and High Energy Physics, proton radioactivity, Proton, ta114, 010308 nuclear & particles physics, Yrast, Nuclear Theory, 01 natural sciences, lcsh:QC1-999, Excited state, 0103 physical sciences, Nuclide, Atomic physics, 010306 general physics, Spectroscopy, Ground state, Nuclear Experiment, multiparticle excited states, lcsh:Physics, Excitation, Line (formation)
Abstract

Excited states have been identified in the heaviest known even-Z N = 84 isotone 158W, which lies in a region of one-proton emitters and the two-proton drip line. The observation of γ-ray transitions feeding the ground state establishes the excitation energy of the yrast 6+ state confirming the spin-gap nature of the α-decaying 8+ isomer. The 8+ isomer is also expected to be unbound to two-proton emission but no evidence for this decay mode was observed. An upper limit for the two-proton decay branch has been deduced as b 2 p ≤ 0.17% at the 90% confidence level. The possibility of observing two-proton emission from multiparticle isomers in nearby nuclides is considered.

Published
2017

4. Single-neutron orbits near 78 Ni: Spectroscopy of theN=49isotope 79 Zn

Author

V. Bildstein, Steven D. Pain, N. Warr, Joonas Konki, K. Nowak, F. Flavigny, T. Kröll, F.K. Wenander, A. Jungclaus, J. F. W. Lane, P. Van Duppen, R. Krücken, F. Nowacki, Kamila Sieja, Marc Huyse, A. Illana, M. von Schmid, Janne Pakarinen, T. Roger, Kathrin Wimmer, D. Mücher, H. De Witte, S. Bottoni, R. Chapman, Roman Gernhäuser, P. Reiter, F. Recchia, G. de Angelis, A. N. Andreyev, D. Voulot, J. Elseviers, J. J. Valiente Dobon, J. F. Smith, Thomas Elias Cocolios, R. Orlandi, Liam Gaffney, Riccardo Raabe, V. Liberati, A. Gottardo, J. G. Johansen, M. Seidlitz, E. Rapisarda, Jan Diriken, E. Sahin, B. A. Marsh, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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 de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Angular momentum, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, gamma-Ray transitions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Transfer reactions, 0103 physical sciences, Nuclear Physics - Experiment, Neutron, Nuclear structure, Nuclear Experiment, 010306 general physics, Spectroscopy, ComputingMilieux_MISCELLANEOUS, N=50 shell closure, [PHYS]Physics [physics], Physics, Elastic scattering, NUCLEI, RICH ISOTOPES, 010308 nuclear & particles physics, lcsh:QC1-999, ELASTIC-SCATTERING, Excited state, Atomic physics, γ-Ray transitions, Nucleon, lcsh:Physics
Abstract

Single-neutron states in the Z=30, N=49isotope 79Zn have been populated using the 78Zn(d,p)79Zn transfer reaction at REX-ISOLDE, CERN. The experimental setup allowed the combined detection of protons ejected in the reaction, and of γrays emitted by 79Zn. The analysis reveals that the lowest excited states populated in the reaction lie at approximately 1MeV of excitation, and involve neutron orbits above the N=50shell gap. From the analysis of γ-ray data and of proton angular distributions, characteristic of the amount of angular momentum transferred, a5/2+configuration was assigned to a state at 983keV. Comparison with large-scale-shell-model calculations supports a robust neutron N=50shell-closure for 78Ni. These data constitute an important step towards the understanding of the magicity of 78Ni and of the structure of nuclei in the region. publisher: Elsevier articletitle: Single-neutron orbits near 78Ni: Spectroscopy of the isotope 79Zn journaltitle: Physics Letters B articlelink: http://dx.doi.org/10.1016/j.physletb.2014.12.006 content_type: article copyright: Copyright © 2014 The Authors. Published by Elsevier B.V. ispartof: Physics Letters B vol:740 pages:298-302 status: published

Published
2015

5. Experimental investigation of the 02+ band in Sm154 as a β-vibrational band

Author

Andrej Herzan, James Smallcombe, R.-D. Herzberg, Juha Sorri, Sami Rinta-Antila, D. G. Jenkins, Paul Greenlees, E. Parr, Janne Pakarinen, Peter M. Jones, C. J. Barton, L.-L. Andersson, Mikael Sandzelius, Paivi Nieminen, Pauli Peura, Jan Sarén, P. J. Davies, Philippos Papadakis, C. Scholey, S. Juutinen, A. Lopez-Martens, Panu Ruotsalainen, Ulrika Jakobsson, Juha Uusitalo, R. Julin, Matti Leino, K. Hauschild, Daniel Cox, P. Rahkila, T. Grahn, Steffen Ketelhut, P. A. Butler, and A. K. Mistry

Subjects
Physics, Nuclear and High Energy Physics, Silicon, 010308 nuclear & particles physics, Gamma ray, chemistry.chemical_element, Germanium, Electron, 01 natural sciences, Bohr model, symbols.namesake, Internal conversion, chemistry, 0103 physical sciences, symbols, Interacting boson model, Atomic physics, 010306 general physics, Spectroscopy
Abstract

A study of Sm 154 through γ -ray and internal conversion electron coincidence measurements was performed using the Silicon And GErmanium spectrometer (SAGE). An upper limit for the ρ 2 ( E 0 ; 2 2 + → 2 1 + ) and measurement of the ρ 2 ( E 0 ; 4 2 + → 4 1 + ) monopole transitions strengths were determined. The extracted transition strength for each is significantly lower than that predicted by either the Bohr and Mottelson β -vibration description or the interacting boson model. Hence, the long standing interpretation of these states as a collective band built on the 0 2 + state, which is conventionally assigned as a Bohr and Mottelson β vibration is questionable.

Published
2014

6. Proton emission from an oblate nucleus 151Lu

Author

Mikael Sandzelius, C. Scholey, Sanna Stolze, Lidia S. Ferreira, A. Herzáň, Rauno Julin, C. McPeake, D. M. Cullen, Tuomas Grahn, Paul Greenlees, Juha Uusitalo, B. Saygi, M. G. Procter, J. Partanen, Panu Ruotsalainen, Janne Pakarinen, D. T. Joss, Michael Taylor, Pauli Peura, Thomas Braunroth, Matti Leino, Ulrika Jakobsson, Juha Sorri, Panu Rahkila, Jan Sarén, Kalle Auranen, E. Ellinger, Enrico Maglione, G. A. Alharshan, A. Dewald, and Joonas Konki

Subjects
Physics, Nuclear and High Energy Physics, ta114, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Elementary particle, 01 natural sciences, 7. Clean energy, Baryon, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, ddc:530, Atomic physics, Proton emission, Nuclear Experiment, 010306 general physics, Ground state, Nucleon, Nucleus
Abstract

Excited states in the proton-unbound nucleus 151Lu have been established using γ-ray coincidence techniques. The lifetime of the first excited state above the proton-emitting ground state has been measured using the recoil-distance Doppler-shift method combined with recoil-decay tagging. The experimental level scheme and extracted lifetime have been compared with state-of-the-art theoretical calculations based upon a non-adiabatic deformed Woods–Saxon potential. This comparison suggests that the proton-emitting ground state in 151Lu is mildly oblate with a deformation β = − 0.11 − 0.05 + 0.02 and represents the best evidence to date for proton emission from an oblate nucleus.

Published
2013

7. Anomalous transition strength in the proton-unbound nucleus I5653109

Author

P. T. Wady, Bo Cederwall, Torbjörn Bäck, C. Scholey, M. Hackstein, Susan Rigby, T. Pissulla, S. Juutinen, Pauli Peura, Jan Sarén, Roberto Liotta, N. M. Lumley, J. P. Revill, Juha Sorri, L. Angus, Ulrika Jakobsson, T. Grahn, Steffen Ketelhut, W. Rother, Juha Uusitalo, P. Rahkila, R. Julin, Panu Ruotsalainen, M. G. Procter, Furong Xu, C. Fransen, Paul Greenlees, Chong Qi, M. Nyman, P. J. R. Mason, Paivi Nieminen, D. M. Cullen, Peter M. Jones, Mikael Sandzelius, Michael Taylor, Matti Leino, A. Dewald, and Janne Pakarinen

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Conjunction (astronomy), Nuclear Theory, 01 natural sciences, 7. Clean energy, Nuclear physics, medicine.anatomical_structure, Transition strength, Excited state, 0103 physical sciences, medicine, Physics::Atomic Physics, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus
Abstract

A lifetime measurement has been made for the first excited 11/2(+) state in the proton-unbound nucleus (109)(53)I56 using the recoil-distance Doppler-shift method in conjunction with recoil-proton ...

Published
2011

8. Probing the limit of nuclear existence: Proton emission from 159Re

Author

D. T. Joss, Robert Page, A. Steer, T. Grahn, Steffen Ketelhut, S. Erturk, P. Rahkila, C. Scholey, M. Venhart, Paul Stevenson, Janne Pakarinen, Juha Uusitalo, J. Simpson, B. Gall, Paul Greenlees, Baharak Hadinia, M. Nyman, Iain Darby, Peter M. Jones, A. J. Cannon, S. Juutinen, Matti Leino, A.-P. Leppänen, Jan Sarén, Jim Al-Khalili, R. Julin, S. Eeckhaudt, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Pakarinen, Janne -- 0000-0001-8944-8757, Darby, Iain -- 0000-0003-2091-2616, Stevenson, Paul -- 0000-0003-2645-2569, Scholey, Catherine -- 0000-0002-8743-6071, Jones, Pete -- 0000-0001-7480-6603, Grahn, Tuomas -- 0000-0002-6255-2279, Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- CCLRC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England -- Nigde Univ, Fen Edebiyat Falkultesi, Fizik Bolumu, Nigde, Turkey -- Comenius Univ, Dept Nucl Phys & Biophys, Bratislava 84248 4, Slovakia -- Univ Strasbourg 1, CNRS, IN2P3, IPHC, F-67037 Strasbourg 2, France -- Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden, and 0-Belirlenecek

Subjects
Nuclear reaction, Nuclear and High Energy Physics, Si detectors, Proton, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], measured E (p), (t)1 / 2, 01 natural sciences, 7. Clean energy, Nuclear physics, Ep, 0103 physical sciences, Enriched targets, Neutron, Nuclide, Proton emission, Nuclear Experiment, 010306 general physics, 106Cd at 300 MeV beam energy, Physics, Isotope, 010308 nuclear & particles physics, 21.10.Hw, 21.10.Tg, 23.50.+z, 27.70.+q, 58Ni, t1/2, NUCLEAR REACTIONS Ni-58+Cd-106 at 300 MeV beam energy, 13. Climate action, Nuclear reactions, Gas-filled recoil separator, Atomic physics, Nucleon, Measured, Radioactive decay
Abstract

WOS: 000240847400007, The observation of the new nuclide Re-159(75)84 provides important insights into the evolution of single-particle structure and the mass surface in heavy nuclei beyond the proton drip line. This nuclide, 26 neutrons away from the nearest stable rhenium isotope, was synthesised in the reaction Cd-106(Ni-58, p4n) and identified via its proton radioactivity using the RITU gas-filled separator and the GREAT focal-plane spectrometer. Comparisons of the measured proton energy (E-p = 1805 +/- 20 keV) and decay half-life (t(1/2) = 21 +/- 4 mu s) with values calculated using the WKB method indicate that the proton is emitted from an h(11/2) state. The implications of these results for future experimental investigations into even more proton unbound nuclei using in-flight separation techniques are considered. (c) 2006 Elsevier B.V. All rights reserved., Science and Technology Facilities Council [EP/C543157/1, EP/C015371/1, EP/C015266/1, ST/G008671/1]

Published
2006

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