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18 results on '"Scholey C."'

1. Delayed or absent pi(h(11/2))(2) alignment in Xe-111

Author

Capponi, L., Smith, J. F., Ruotsalainen, P., Scholey, C., Rahkila, P., Bianco, L., McPeake, C., and Ege Üniversitesi

Abstract

Excited states have been identified in the very neutron-deficient N = Z + 3 nucleus Xe-111 for the first time, using the Ni-58(Ni-58, alpha n) heavy-ion fusion-evaporation reaction. gamma-ray transitions have been unambiguously assigned to Xe-111 by correlation with the characteristic Xe-111 -> Te-107 -> Sn-103 alpha-decay chain using the method of recoil-decay tagging. Inspection of gamma gamma-coincidence data has shown that five of the transitions form a rotational-like sequence. Excitation-energy systematics suggest that the sequence could be the favored signature partner of a band built on an h(11/2) neutron. Aligned angular momenta of states in the band have been compared to analogous bands in neighboring xenon isotopes. the aligned angular momenta for the Xe-111 band are constant over the range of observed rotational frequencies, suggesting that the first pi(h(11/2))(2) alignment is either delayed or absent. It is speculated that the alignment of h(11/2) protons in the presence of neutrons in near-identical h(11/2) orbitals may be affected by neutron-proton interactions or by the onset of octupole correlations., Science and Technology Facilities Council (UK)Science & Technology Facilities Council (STFC) [ST/J000183/2, ST/L005808/1]; EUEuropean Union (EU) [262010]; Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL) [213503], This work was supported by the Science and Technology Facilities Council (UK) under Grants No. ST/J000183/2 (UWS) and No. ST/L005808/1 (UWS). It was also supported by the EU 7th Framework Programme "Integrating Activities-Transnational Access" Project No. 262010 (EN-SAR) and by the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL; Contract No. 213503). the authors acknowledge the support of Gammapool for the loan of the Jurogam HPGe detectors.

Published
2020

2. Shape coexistence in Hg-178

Author

Mueller-Gatermann, C., Dewald, A., Fransen, C., Auranen, K., Badran, H., Beckers, M., Blazhev, A., Braunroth, T., Cullen, D. M., Fruet, G., Goldkuhle, A., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, U., Jenkins, D., Jolie, J., Julin, R., Juutinen, S., Konki, J., Leino, M., Litzinger, J., Nomura, K., Pakarinen, J., Peura, P., Procter, M. G., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Uusitalo, J., Zell, K. O., Mueller-Gatermann, C., Dewald, A., Fransen, C., Auranen, K., Badran, H., Beckers, M., Blazhev, A., Braunroth, T., Cullen, D. M., Fruet, G., Goldkuhle, A., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, U., Jenkins, D., Jolie, J., Julin, R., Juutinen, S., Konki, J., Leino, M., Litzinger, J., Nomura, K., Pakarinen, J., Peura, P., Procter, M. G., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Uusitalo, J., and Zell, K. O.

Abstract

Lifetime measurements of excited states in Hg-178 have been performed using the Rh-103(Kr-78, p2n) reaction at a beam energy of 354 MeV. The recoil-decay tagging (RDT) technique was applied to select the Hg-178 nuclei and associate the prompt gamma rays with the correlated characteristic ground-state alpha decay. Lifetimes of the four lowest yrast states of Hg-178 have been determined using the recoil distance Doppler-shift (RDDS) method. The experimental data are compared to theoretical predictions with focus on shape coexistence. The results confirm the shift of the deformed prolate structures to higher lying states but also indicate their increasing deformation with decreasing neutron number.

Published
2019

3. Low-lying electromagnetic transition strengths in Pt-180

Author

Mueller-Gatermann, C., Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Regis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, T., Greenlees, P. T., Hauschild, K., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Nieminen, P., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., Petkov, P., Mueller-Gatermann, C., Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Regis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, T., Greenlees, P. T., Hauschild, K., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Nieminen, P., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Uusitalo, J., and Petkov, P.

Abstract

Lifetime measurements have been performed using the Mo-98(Kr-86, 4n)Pt-180 reaction at a beam energy of 380 MeV, and the recoil distance Doppler-shift method. In a second experiment the Yb-168(O-16, 4n)Pt-180 reaction at a beam energy of 88 MeV using the Ge-gated gamma-gamma fast timing technique was used to determine lifetimes. Lifetimes of the four lowest yrast states of Pt-180 have been determined. The experimental data are compared to calculations within the framework of the interacting boson model and the general collective model. Both models predict a deformed ground state and are consistent with all the remaining experimental results.

Published
2018

4. Lifetime Measurements of Excited States in Pt-172 and the Variation of Quadrupole Transition Strength with Angular Momentum

Author

Cederwall, B., Doncel, M., Aktas, O., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Cullen, D. M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Fang, Y. D., Greenlees, P. T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Raju, M. Kumar, Li, H., Liu, H., Matta, S., Modamio, V., Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C. M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Subramaniam, P., Taylor, M. J., Uusitalo, J., Valiente-Dobon, J. J., Cederwall, B., Doncel, M., Aktas, O., Ertoprak, A., Liotta, R., Qi, C., Grahn, T., Cullen, D. M., Hodge, D., Giles, M., Stolze, S., Badran, H., Braunroth, T., Calverley, T., Cox, D. M., Fang, Y. D., Greenlees, P. T., Hilton, J., Ideguchi, E., Julin, R., Juutinen, S., Raju, M. Kumar, Li, H., Liu, H., Matta, S., Modamio, V., Pakarinen, J., Papadakis, P., Partanen, J., Petrache, C. M., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Subramaniam, P., Taylor, M. J., Uusitalo, J., and Valiente-Dobon, J. J.

Abstract

Lifetimes of the first excited 2(+) and 4(+) states in the extremely neutron -deficient nuclide Pt-172 have been measured for the first time using the recoil-distance Doppler shift and recoil-decay tagging techniques. An unusually low value of the ratio B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) = 0.55(19) was found, similar to a handful of other such anomalous cases observed in the entire Segre chart. The observation adds to a cluster of a few extremely neutron -deficient nuclides of the heavy transition metals with neutron numbers N approximate to 90-94 featuring the effect. No theoretical model calculations reported to date have been able to explain the anomalously low B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) ratios observed in these cases. Such low values cannot, e.g., be explained within the framework of the geometrical collective model or by algebraic approaches within the interacting boson model framework. It is proposed that the group of B(E2: 4(1)(+) -> 2(1)(+)/B(E2: 2(1)(+) -> 0(gs)(+)) ratios in the extremely neutron-deficient even-even W, Os, and Pt nuclei around neutron numbers N approximate to 90-94 reveal a quantum phase transition from a seniority-conserving structure to a collective regime as a function of neutron number. Although a system governed by seniority symmetry is the only theoretical framework for which such an effect may naturally occur, the phenomenon is highly unexpected for these nuclei that are not situated near closed shells.

Published
2018

5. Lifetime measurements of lowest states in the pi g(7/2) circle times nu h(11/2) rotational band in I-112

Author

Giles, M. M., Cullen, D. M., Singh, B. S. Nara, Hodge, D., Taylor, M. J., Mallaburn, M. J., Sosnin, N. V., Barber, L., Smith, J. F., Capponi, L., Smolen, M., Scholey, C., Rahkila, P., Grahn, T., Badran, H., Girka, A., Greenlees, P. T., Julin, R., Konki, J., Nefodov, O., Ruotsalainen, P., Sandzelius, M., Saren, J., Sorri, J., Stolze, S., Uusitalo, J., Pakarinen, J., Papadakis, P., Partanen, J., Braunroth, T., O'Neill, G. G., Giles, M. M., Cullen, D. M., Singh, B. S. Nara, Hodge, D., Taylor, M. J., Mallaburn, M. J., Sosnin, N. V., Barber, L., Smith, J. F., Capponi, L., Smolen, M., Scholey, C., Rahkila, P., Grahn, T., Badran, H., Girka, A., Greenlees, P. T., Julin, R., Konki, J., Nefodov, O., Ruotsalainen, P., Sandzelius, M., Saren, J., Sorri, J., Stolze, S., Uusitalo, J., Pakarinen, J., Papadakis, P., Partanen, J., Braunroth, T., and O'Neill, G. G.

Abstract

A differential- plunger device was used to measure the lifetimes of the lowest states in the pi g(7/2) circle times nu h(11/2) rotational band in doubly odd I-112 with the Ni-58(Ni-58, 3pn) reaction. A differential decay curve method was performed using the fully shifted and degraded gamma-ray intensity measurements as a function of target- to- degrader distance. The lifetimes of the lowest three states in the pi g(7/2) circle times nu h(11/2) band in I-112 were measured to be 124(30), 130(25), and <= 6.5(5) ps, respectively. As the lifetimes of successive excited states in a rotational band are expected to decrease with increasing excitation energy, these measurements suggest that the order of the transitions in the established band in I-112 may need revising and that the state tentatively assigned to be (7(-)) may not belong to the rotational band.

Published
2018

6. Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei

Author

Doncel, Maria, Cederwall, Bo, Qi, Chong, Li, Hongjie J., Jakobsson, Ulrika, Auranen, K., Boenig, S., Drummond, M. C., Grahn, T., Greenlees, P. T., Herzan, A., Joss, D. T., Julin, R., Juutinen, S., Konki, J., Kroell, T., Leino, M., McPeake, C., O'Donnell, D., Page, R. D., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Saren, J., Saygi, B., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., Uusitalo, J., and Ege Üniversitesi

Subjects
Physical Sciences, Fysik
Abstract

WOS: 000400140500006, Lifetimes of the first excited 2(+) states in the extremely neutron- deficient W-162 and W-164 nuclei have been measured using the recoil distance Doppler shift technique. Experimental B(E2) data for the isotopic chains of hafnium, tungsten, and osmium, from the midshell region near the beta-stability line towards the N = 82 closed shell and the most neutron-deficient nuclides, are compared with predictions of nuclear deformations and 2(1)(+) -> 0(g.s)(.+) reduced transition strengths from different classes of state-of-the-art theoretical model calculations. The results reveal striking differences and deficiencies in the predictive power of current nuclear structure models., Swedish Research CouncilSwedish Research Council [621-2014-5558]; United Kingdom Science and Technology Facilities Council (STFC)Science & Technology Facilities Council (STFC)Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of Science; EU 7th Framework Programme, Integrating Activities Transnational Access [262010 ENSAR]; Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL), This work was supported by the Swedish Research Council under Grant No. 621-2014-5558, the United Kingdom Science and Technology Facilities Council (STFC), the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR, and the Academy of Finland under the Finnish Centre of Excellence Programme (Nuclear and Accelerator Based Physics Programme at JYFL). The authors acknowledge the support of the GAMMAPOOL for the JUROGAM detectors.

Published
2017

7. Experimental study of isomeric intruder 1/2(+) states in At-197,At-203

Author

Auranen, K., Uusitalo, J., Juutinen, S., Badran, H., Bisso, F. Defranchi, Cox, D., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, Ulrika, Julin, R., Konki, J., Leino, M., Lightfoot, A., Mallaburn, M., Neuvonen, O., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Auranen, K., Uusitalo, J., Juutinen, S., Badran, H., Bisso, F. Defranchi, Cox, D., Grahn, T., Greenlees, P. T., Herzan, A., Jakobsson, Ulrika, Julin, R., Konki, J., Leino, M., Lightfoot, A., Mallaburn, M., Neuvonen, O., Pakarinen, J., Papadakis, P., Partanen, J., Rahkila, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., and Stolze, S.

Abstract

A newly observed isomeric intruder 1/2(+) state [T-1/2 = 3.5( 6) ms] is identified in At-203 using a gas-filled recoil separator and fusion-evaporation reactions. The isomer is depopulated through a cascade of E3 and mixed M1/E2 transitions to the 9/2(-) ground state, and it is suggested to originate from the pi(s(1/2))(-1) configuration. In addition, the structures above the 1/2(+) state in At-203 and At-197 are studied using in-beam gamma-ray spectroscopy, recoil-decay tagging, and recoil-isomer decay tagging methods. The 1/2(+) state is fed from 3/2(+) and 5/2(+) states, and the origin of these states are discussed., QC 20170531

Published
2017
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8. Reduced transition probabilities along the yrast line in W-166

Author

Saygi, B., Joss, D. T., Page, R. D., Grahn, T., Simpson, J., O'Donnell, D., Alharshan, G., Auranen, K., Back, T., Boening, S., Braunroth, T., Carroll, R. J., Cederwall, B., Cullen, D. M., Dewald, A., Doncel, M., Donosa, L., Drummond, M. C., Ertugral, F., Erturk, S., Fransen, C., Greenlees, P. T., Hackstein, M., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Konki, J., Kroell, T., Labiche, M., Lopez-Martens, A., McPeake, C. G., Moradi, F., Moeller, O., Mustafa, M., Nieminen, P., Pakarinen, J., Partanen, J., Peura, P., Procter, M., Rahkila, P., Rother, W., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., Uusitalo, J., Saygi, B., Joss, D. T., Page, R. D., Grahn, T., Simpson, J., O'Donnell, D., Alharshan, G., Auranen, K., Back, T., Boening, S., Braunroth, T., Carroll, R. J., Cederwall, B., Cullen, D. M., Dewald, A., Doncel, M., Donosa, L., Drummond, M. C., Ertugral, F., Erturk, S., Fransen, C., Greenlees, P. T., Hackstein, M., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Konki, J., Kroell, T., Labiche, M., Lopez-Martens, A., McPeake, C. G., Moradi, F., Moeller, O., Mustafa, M., Nieminen, P., Pakarinen, J., Partanen, J., Peura, P., Procter, M., Rahkila, P., Rother, W., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Taylor, M. J., Thornthwaite, A., and Uusitalo, J.

Abstract

Lifetimes of excited states in the yrast band of the neutron-deficient nuclide W-166 have been measured utilizing the DPUNS plunger device at the target position of the JUROGAM II gamma-ray spectrometer in conjunction with the RITU gas-filled separator and the GREAT focal-plane spectrometer. Excited states in W-166 were populated in the Mo-92(Kr-78, 4p) reaction at a bombarding energy of 380 MeV. The measurements reveal a low value for the ratio of reduced transitions probabilities for the lowest-lying transitions B(E2; 4(+)-> 2(+)) / B(E2; 2(+)-> 0(+)) = 0.33(5), compared with the expected ratio for an axially deformed rotor (B-4/2 = 1.43).

Published
2017

9. Deformation of the proton emitter Cs-113 from electromagnetic transition and proton-emission rates

Author

Hodge, D., Cullen, D. M., Taylor, M. J., Singh, B. S. Nara, Ferreira, L. S., Maglione, E., Smith, J. F., Scholey, C., Rahkila, P., Grahn, T., Braunroth, T., Badran, H., Capponi, L., Girka, A., Greenlees, P. T., Julin, R., Konki, J., Mallaburn, M., Nefodov, O., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Ruotsalainen, P., Sandzelius, M., Saren, J., Smolen, M., Sorri, J., Stolze, S., Uusitalo, J., Hodge, D., Cullen, D. M., Taylor, M. J., Singh, B. S. Nara, Ferreira, L. S., Maglione, E., Smith, J. F., Scholey, C., Rahkila, P., Grahn, T., Braunroth, T., Badran, H., Capponi, L., Girka, A., Greenlees, P. T., Julin, R., Konki, J., Mallaburn, M., Nefodov, O., O'Neill, G. G., Pakarinen, J., Papadakis, P., Partanen, J., Ruotsalainen, P., Sandzelius, M., Saren, J., Smolen, M., Sorri, J., Stolze, S., and Uusitalo, J.

Abstract

The lifetime of the (11/2(+)) state in the band above the proton-emitting (3/2(+)) state in Cs-113 has been measured to be tau = 24(6) ps from a recoil-decay-tagged differential-plunger experiment. The measured lifetime was used to deduce the deformation of the states using wave functions from a nonadiabatic quasiparticle model to independently calculate both proton-emission and electromagnetic gamma-ray transition rates as a function of deformation. The only quadrupole deformation, which was able to reproduce the experimental excitation energies of the states, the electromagnetic decay rate of the (11/2(+)) state and the proton-emission rate of the (3/2(+)) state, was found to be beta(2) = 0.22(6). This deformation is in agreement with the earlier proton emission studies which concluded that Cs-113 was best described as a deformed proton emitter, however, it is now more firmly supported by the present measurement of the electromagnetic transition rate.

Published
2016

10. Excited states and reduced transition probabilities in Os-168

Author

Grahn, T., Stolze, S., Joss, D. T., Page, R. D., Saygi, B., O'Donnell, D., Akmali, M., Andgren, K., Bianco, L., Cullen, D. M., Dewald, A., Greenlees, P. T., Heyde, K., Iwasaki, H., Jakobsson, U., Jones, P., Judson, D. S., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N., Mason, P. J. R., Moeller, O., Nomura, K., Nyman, M., Petts, A., Peura, P., Pietralla, N., Pissulla, Th., Rahkila, P., Sapple, P. J., Saren, J., Scholey, C., Simpson, J., Sorri, J., Stevenson, P. D., Uusitalo, J., Watkins, H. V., Wood, J. L., Grahn, T., Stolze, S., Joss, D. T., Page, R. D., Saygi, B., O'Donnell, D., Akmali, M., Andgren, K., Bianco, L., Cullen, D. M., Dewald, A., Greenlees, P. T., Heyde, K., Iwasaki, H., Jakobsson, U., Jones, P., Judson, D. S., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lumley, N., Mason, P. J. R., Moeller, O., Nomura, K., Nyman, M., Petts, A., Peura, P., Pietralla, N., Pissulla, Th., Rahkila, P., Sapple, P. J., Saren, J., Scholey, C., Simpson, J., Sorri, J., Stevenson, P. D., Uusitalo, J., Watkins, H. V., and Wood, J. L.

Abstract

The level scheme of the neutron-deficient nuclide Os-168 has been extended and mean lifetimes of excited states have been measured by the recoil distance Doppler-shift method using the JUROGAM gamma-ray spectrometer in conjunction with the IKP Koln plunger device. The 168Os. rays were measured in delayed coincidence with recoiling fusion-evaporation residues detected at the focal plane of the RITU gas-filled separator. The ratio of reduced transition probabilities B(E2; 4(1)(+)-> 2(1)(+))/B(E2; 2(1)(+)-> 0(1)(+)) is measured to be 0.34(18), which is very unusual for collective band structures and cannot be reproduced by interacting boson model (IBM-2) calculations based on the SkM* energy-density functional.

Published
2016

11. In-beam gamma-ray spectroscopy of the N=85 isotones W-159 and Re-160

Author

Sapple, P. J., Page, R. D., Joss, D. T., Bianco, L., Grahn, T., Pakarinen, J., Thomson, J., Simpson, J., O'Donnell, D., Erturk, S., Greenlees, P. T., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Nyman, M., Peura, P., Puurunen, A., Rahkila, P., Ruotsalainen, P., Saren, J., Scholey, C., Uusitalo, J., Scholey, Catherine -- 0000-0002-8743-6071, Pakarinen, Janne -- 0000-0001-8944-8757, O'Donnell, David -- 0000-0002-4710-3803, Ruotsalainen, Panu -- 0000-0002-8335-452X, Jones, Pete -- 0000-0001-7480-6603, Grahn, Tuomas -- 0000-0002-6255-2279, Jakobsson, Ulrika -- 0000-0001-9741-141X, Peura, Pauli -- 0000-0002-8541-0169, and [Sapple, P. J. -- Page, R. D. -- Joss, D. T. -- Bianco, L. -- Grahn, T. -- Pakarinen, J. -- Thomson, J.] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Simpson, J. -- O'Donnell, D.] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Erturk, S.] Nigde Univ, Fen Edebiyat Fak, Fiz Bolumu, TR-51100 Nigde, Turkey -- [Greenlees, P. T. -- Jakobsson, U. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Nyman, M. -- Peura, P. -- Puurunen, A. -- Rahkila, P. -- Ruotsalainen, P. -- Saren, J. -- Scholey, C. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

Abstract

WOS: 000296522000001, Excited states have been identified in the isotones W-159(74) and Re-160(75), which were produced in fusion-evaporation reactions of a beam of 310-MeV Ni-58 ions with an isotopically enriched Cd-106 target. The strongest gamma-ray transitions in W-159 and Re-160 are interpreted as continuing the regular sequence of states identified in lighter N = 85 isotones that are built upon 9/2(-) and 10(+) states, respectively. The half-life of Hf-155, the beta-decaying daughter of the a decay of W-159, was measured with improved precision to be 840 +/- 30 ms., UK Science and Technology Facilities Council; EU [RII3-CT-2004-506065 (EURONS)]; Academy of Finland [213503, 209430, 111965]; Science and Technology Facilities Council [ST/J000108/1, ST/G008620/1, EP/C015371/1, ST/J000094/1, EP/C015266/1, ST/G008671/1], The authors thank the technical staff at the University of Jyvaskyla for their excellent support and Paul Morrall for making the targets. This work has been supported by the UK Science and Technology Facilities Council; by the EU 6th Framework Programme "Integrating Infrastructure Initiative Transnational Access," Contract No. RII3-CT-2004-506065 (EURONS); and by the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 (Nuclear and Accelerator Based Physics Programme at JYFL), Contract No. 213503. C. S. (Contract No. 209430) and P. T. G. (Contract No. 111965) acknowledge the support of the Academy of Finland. We thank the GAMMAPOOL European Spectroscopy Resource for the loan of germanium detectors for JUROGAM, and we thank the French CNRS/IN2P3 for the use of the TNT2 digital electronics.

Published
2011

12. gamma-ray spectroscopy of Ta-163

Author

Sandzelius, M., Cederwall, B., Ganioglu, E., Thomson, J., Andgren, K., Bianco, L., Back, T., Eeckhaudt, S., Ertuerk, S., Hornillos, M. B. Gomez, Grahn, T., Greenlees, P. T., Hadinia, B., Johnson, A., Jones, P. M., Joss, D. T., Julin, R., Juutinen, S., Ketelhut, S., Khaplanov, A., Leino, M., Nyman, M., Page, R. D., Rahkila, P., Saren, J., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Wyss, R., Cederwall, Bo -- 0000-0003-1771-2656, Scholey, Catherine -- 0000-0002-8743-6071, Wyss, Ramon A. -- 0000-0001-6899-2964, Grahn, Tuomas -- 0000-0002-6255-2279, Jones, Pete -- 0000-0001-7480-6603, Back, Torbjorn -- 0000-0003-1996-0805, and [Sandzelius, M. -- Cederwall, B. -- Ganioglu, E. -- Andgren, K. -- Back, T. -- Hadinia, B. -- Johnson, A. -- Khaplanov, A. -- Wyss, R.] Royal Inst Technol, Dept Phys, S-10691 Stockholm, Sweden -- [Sandzelius, M. -- Eeckhaudt, S. -- Grahn, T. -- Greenlees, P. T. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Nyman, M. -- Rahkila, P. -- Saren, J. -- Scholey, C. -- Sorri, J. -- Uusitalo, J.] Univ Jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- [Thomson, J. -- Bianco, L. -- Joss, D. T. -- Page, R. D.] Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Ertuerk, S. -- Hornillos, M. B. Gomez -- Simpson, J.] CCLRC Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Ganioglu, E.] Univ Istanbul, Fac Sci, Dept Phys, TR-34459 Istanbul, Turkey -- Nigde Univ, Fac Sci, Dept Phys, TR-51200 Nigde, Turkey

Abstract

WOS: 000272313000030, Excited states in Ta-163 have been identified for the first time using the Cd-106(Ni-60,3p) fusion evaporation reaction. gamma rays were detected using the JUROGAM gamma-ray spectrometer and recoil discrimination was achieved using the recoil ion transport unit (RITU) gas-filled separator in conjunction with the GREAT spectrometer situated at the focal plane of the RITU. The yrast states are assigned to a strongly coupled rotational band based on a pi h(11/2) configuration. This structure exhibits large signature splitting at low spins that disappears after the paired band crossing because of the alignment of a pair of i(13/2) neutrons. This effect is ascribed to triaxial shape changes induced by the core-polarizing properties of the deformation-aligned h(11/2) proton and the rotation-aligned i(13/2) neutrons. Two additional strongly coupled band structures have been established and are discussed in terms of octupole-vibrational and two-quasiparticle excitations built on the yrast structure. The experimental results are compared with predictions from cranked-shell-model and total-Routhian-surface calculations., Swedish Research Council; Goran Gustafsson Foundation; Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 [44875]; UK Science and Technology Facilities Council; European Union [HPRI-CT-1999-00044]; NordForsk [070315]; Turkish Atomic Energy Authority (TAEK) [DPT-04K120100-4]; Finnish Academy [209430-111965]; UK/France [EPSRC/IN2P3]; Science and Technology Facilities Council [ST/G008620/1, EP/C015266/1, ST/F012039/1, ST/G008671/1, EP/C015371/1, ST/J000108/1, EP/C543157/1], The authors thank the crew at the Accelerator Laboratory at the University of Jyvraskyla for their excellent technical support. Further support for this work has been provided by the Swedish Research Council, the Goran Gustafsson Foundation, the Academy of Finland under the Finnish Centre of Excellence Programme 2006-2011 (Project No. 44875, Nuclear and Condensed Matter Physics Programme at JYFL), the UK Science and Technology Facilities Council and the European Union Fifth Framework Programme "Improving Human Potential-Access to Research Infrastructure" (Contract No. HPRI-CT-1999-00044), the Nordic Infrastructure support by NordForsk (Project 070315), and the Turkish Atomic Energy Authority (TAEK) under Project No. DPT-04K120100-4. C. S. and P. T. G. acknowledge support from the Finnish Academy (Contract No. 209430-111965). We also thank the UK/France (EPSRC/IN2P3) Detector Loan Pool and the EUROBALL owners committee (gamma-pool network) for the loan of the EUROGAM detectors of JUROGAM and GSI for the loan of two additional VEGA clover detectors.

Published
2009

13. Isomeric and ground-state properties of Pt-171(78), Os-167(76), and W-163(74)

Author

Scholey, C., Andgren, K., Bianco, L., Cederwall, B., Darby, I. G., Eeckhaudt, S., Joss, D. T., and 0-Belirlenecek

Subjects
0-Belirlenecek
Abstract

WOS: 000274002700018, Decay paths, half-lives, and excitation energies of the i(13/2) bandheads of the neutron-deficient nuclei Pt-171, Os-167, and W-163 have been established for the first time. Gamma-ray transitions, X-rays, and internal conversion electrons have been observed, allowing internal-conversion coefficients to be measured and B(M2) reduced transition probabilities to be extracted. These results elucidate the low-lying single-quasiparticle structures and give the energy level spacings between the nu f(7/2), nu h(9/2), and nu i(13/2) quasineutron states for all three nuclei. Moreover, ground-state spin assignments have been made for the first time, along with the measurement of the alpha-decay branching ratio for Pt-171. The decay paths of the i(13/2) bandheads were followed by favored alpha decays, indicating that all three nuclei have the same I-pi = 7/2(-) ground state., Academy of Finland [44875, 213503]; Swedish Research Council; Goran Gustafsson Foundation; EU [HPRI-CT-1999-00044]; EXOTAG [HPRI-1999-CT-50017]; UK Engineering and Physical Sciences Research Council and Science; Technology Facilities Council [209430, 121110, 111965]; Slovak Research and Development Agency [APVV-20-006205]; Science and Technology Facilities Council [EP/C543157/1, EP/C015371/1, EP/C015266/1, ST/J000108/1, ST/G008671/1, ST/F012039/1, ST/G008620/1], This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Programme (Project Nos. 44875 and 213503), the Swedish Research Council, the Goran Gustafsson Foundation, the EU FP5(HPRI-CT-1999-00044) and EXOTAG (HPRI-1999-CT-50017), through the EU-FP6-I3 project EURONS (RII3-CT-2004-506065), and the UK Engineering and Physical Sciences Research Council and Science and Technology Facilities Council. C. S. (209430), P.N. (121110), and P. T. G. (111965) acknowledge the support of the Academy of Finland; V. M., M. S., and I. G. D. acknowledge support from the EC Marie Curie Actions grant; V. M. acknowledges the Slovak Research and Development Agency (Contract No. APVV-20-006205); and E. I. and M. N. support from the JSPS Core-to-Core Program, International Research Network for Exotic Femto Systems. We thank the UK/France (STFC/IN2P3) Loan Pool and GAMMAPOOL European Spectroscopy Resource for the loan of the detectors for JUROGAM and GSI for the loan of the VEGA (1/4018/07) detectors.

Published
2010

14. Electromagnetic transition strengths in Te-109(52)

Author

Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., Xu, F. R., Procter, M. G., Cullen, D. M., Scholey, C., Ruotsalainen, P., Angus, L., Back, T., Cederwall, B., Dewald, A., Fransen, C., Grahn, T., Greenlees, P. T., Hackstein, M., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Liotta, R., Lumley, N. M., Mason, P. J. R., Nieminen, P., Nyman, M., Pakarinen, J., Pissulla, T., Peura, P., Rahkila, P., Revill, J., Rigby, S. V., Rother, W., Sandzelius, M., Saren, J., Sorri, J., Taylor, M. J., Uusitalo, J., Wady, P., Qi, C., and Xu, F. R.

Abstract

Lifetime measurements have been made in the neutron-deficient nucleus Te-109 using the coincident recoil distance Doppler-shift method. The experimental B(E2) values have been compared with state-of-the-art shell-model calculations using the monopole-corrected realistic charge-dependent Bonn nucleon-nucleon potential. Lifetimes in the vh(11/2) band are consistent with an interpretation based on the deformation driving properties of a single valence neutron outside of the even-even tellurium core and highlight the unexpected presence of collective behavior as the N = 50 shell closure is approached. Lifetime measurements for the low-lying positive-parity states also appear to correlate well with shell-model calculations. In addition, a comparison with the proton-unbound nucleus I-109 suggests that the presence of a single decoupled valence proton affects the total measured B(E2) strengths in a manner that is not currently well understood.

Published
2012

15. Lifetime measurement of the first excited 2(+) state in Te-108

Author

Back, T., Qi, C., Moradi, F. Ghazi, Cederwall, B., Johnson, A., Liotta, R., Wyss, R., Al-Azri, H., Bloor, D., Brock, T., Wadsworth, R., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Jacobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lopez-Martens, A., Nieminen, P., Peura, P., Rahkila, P., Rinta-Antila, S., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Uusitalo, J., Go, S., Ideguchi, E., Cullen, D. M., Procter, M. G., Braunroth, T., Dewald, A., Fransen, C., Hackstein, M., Litzinger, J., Rother, W., Back, T., Qi, C., Moradi, F. Ghazi, Cederwall, B., Johnson, A., Liotta, R., Wyss, R., Al-Azri, H., Bloor, D., Brock, T., Wadsworth, R., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Jacobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lopez-Martens, A., Nieminen, P., Peura, P., Rahkila, P., Rinta-Antila, S., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Uusitalo, J., Go, S., Ideguchi, E., Cullen, D. M., Procter, M. G., Braunroth, T., Dewald, A., Fransen, C., Hackstein, M., Litzinger, J., and Rother, W.

Abstract

The lifetime of the first excited 2(+) state in the neutron deficient nuclide Te-108 has been measured for the first time, using a combined recoil decay tagging and recoil distance Doppler shift technique. The deduced reduced transition probability is B(E2;0(g.s.)(+) -> 2(+)) = 0.39(-0.04)(+0.05)e(2)b(2). Compared to previous experimental data on neutron deficient tellurium isotopes, the new data point constitutes a large step (six neutrons) toward the N = 50 shell closure. In contrast to what has earlier been reported for the light tin isotopes, our result for tellurium does not show any enhanced transition probability with respect to the theoretical predictions and the tellurium systematics including the new data is successfully reproduced by state-of-the-art shell model calculations.

Published
2011

16. Lifetime measurements probing triple shape coexistence in Au-175

Author

Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., Venhart, M., Watkins, H., Joss, D. T., Grahn, T., Page, R. D., Carroll, R. J., Dewald, A., Greenlees, P. T., Hackstein, M., Herzberg, R-D., Jakobsson, U., Jones, P. M., Julin, R., Juutinen, S., Ketelhut, S., Kroell, T., Kruecken, R., Labiche, M., Leino, M., Lumley, N., Maierbeck, P., Nyman, M., Nieminen, P., O'Donnell, D., Ollier, J., Pakarinen, J., Peura, P., Pissulla, T., Rahkila, P., Revill, J. P., Rother, W., Ruotsalainen, P., Rigby, S. V., Saren, J., Sapple, P. J., Scheck, M., Scholey, C., Simpson, J., Sorri, J., Uusitalo, J., and Venhart, M.

Abstract

Lifetimes of the low-lying excited states in the very neutron-deficient nucleus Au-175 have been measured by the recoil-distance Doppler-shift method using gamma-ray spectra obtained with the recoil-decay tagging technique. Transition quadrupole moments and reduced transition probabilities extracted for this odd-Z nucleus indicate the existence of three different shapes and the competition between collective and noncollective structures.

Published
2011

17. Characterizing the atomic mass surface beyond the proton drip line via alpha-decay measurements of the pi s(1/2) ground state of Re-165 and the pi h(11/2) isomer in Ta-161

Author

Ertuğral Yamaç, Filiz, Thornthwaite, A, O'Donnell, D, Page, RD, Joss, DT, Scholey, C, Bianco, L, Capponi, L, Carroll, RJ, Darby, IG, Donosa, L, Drummond, MC, Ertugral, F, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Jakobsson, U, Jones, P, Julin, R, Juutinen, S, Ketelhut, S, Labiche, M, Leino, M, Lopez-Martens, A, Mullholland, K, Nieminen, P, Peura, P, Rahkila, P, Rinta-Antila, S, Ruotsalainen, P, Sandzelius, M, Saren, J, Saygi, B, Simpson, J, Sorri, J, Uusitalo, J, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, and Ertuğral Yamaç, Filiz

Subjects
Physics
Abstract

The alpha-decay chains originating from the pi s(1/2) and pi h(11/2) states in Au-173 have been investigated following fusion-evaporation reactions. Four generations of alpha radioactivities have been correlated with Au-173(m) leading to a measurement of the alpha decay of Ta-161(m). It has been found that the known alpha decay of Ta-161, which was previously associated with the decay of the ground state, is in fact the decay of an isomeric state. This work also reports on the first observation of prompt gamma rays feeding the ground state of Au-173. This prompt gamma radiation was used to aid the study of the alpha-decay chain originating from the pi s(1/2) state in Au-173. Three generations of alpha decays have been correlated with this state, leading to the observation of a previously unreported activity which is assigned as the decay of Re-165(g). This work also reports the excitation energy of an alpha-decaying isomer in Ta-161 and the Q(alpha) value of the decay of Ta-161(g). DOI:10.1103/PhysRevC.86.064315

Published
2012

18. First observation of excited states of Hg-173

Author

Ertuğral Yamaç, Filiz, O'Donnell, D, Page, RD, Scholey, C, Bianco, L, Capponi, L, Carroll, RJ, Darby, IG, Donosa, L, Drummond, M, Ertugral, F, Grahn, T, Greenlees, PT, Hauschild, K, Herzan, A, Jakobsson, U, Jones, P, Joss, DT, Julin, R, Juutinen, S, Ketelhut, S, Labiche, M, Leino, M, Lopez-Martens, A, Mulholland, K, Nieminen, P, Peura, P, Rahkila, P, Rinta-Antila, S, Ruotsalainen, P, Sandzelius, M, Saren, J, Saygi, B, Simpson, J, Sorri, J, Thornthwaite, A, Uusitalo, J, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, and Ertuğral Yamaç, Filiz

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Physics, Nuclear Theory, Nuclear Experiment
Abstract

The neutron-deficient nucleus Hg-173 has been studied following fusion-evaporation reactions. The observation of the decay of excited states via gamma radiation are reported for the first time and a tentative level scheme is proposed. The proposed level scheme is discussed within the context of the systematics of neighboring neutron-deficient Hg nuclei. In addition to the gamma-ray spectroscopy, the alpha decay of this nucleus has been measured yielding superior precision to earlier measurements.

Published
2012

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