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12 results on '"McPeake, C. G."'

1. New collective structures in Au179 and their implications for the triaxial deformation of the Pt178 core

Author

Balogh, M., primary, Jajčišinová, E., additional, Venhart, M., additional, Herzáň, A., additional, Wood, J. L., additional, Joss, D. T., additional, Ali, F. A., additional, Auranen, K., additional, Bánovská, S., additional, Bírová, M., additional, Carroll, R. J., additional, Cox, D. M., additional, Cubiss, J. G., additional, Davis, T., additional, Drummond, M. C., additional, Greenlees, P. T., additional, Grahn, T., additional, Gredley, A., additional, Henderson, J., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Kantay, G., additional, Konki, J., additional, Konopka, P., additional, Leino, M., additional, Matoušek, V., additional, Mistry, A. K., additional, McPeake, C. G., additional, O'Donnell, D., additional, Page, R. D., additional, Pakarinen, J., additional, Papadakis, P., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Saygı, B., additional, Sedlák, M., additional, Seweryniak, D., additional, Scholey, C., additional, Sorri, J., additional, Špaček, A., additional, Stolze, S., additional, Taylor, M., additional, Thornthwaite, A., additional, Uusitalo, J., additional, Veselský, M., additional, Vielhauer, S., additional, and Wearing, F. P., additional

Published
2022
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2. New collective structures in 179Au and their implications for the triaxial deformation of the 178Pt core

Author

Balogh, M., Jajčišinová, E., Venhart, M., Herzáň, A., Wood, J. L., Joss, D. T., Ali, F. A., Auranen, K., Bánovská, S., Bírová, M., Carroll, R. J., Cox D., M., Cubiss J., G., Davis, T., Drummond M., C., Greenlees, P. T., Grahn, T., Gredley, A., Henderson, J., Jakobsson, U., Julin, R., Juutinen, S., Kantay, G., Konki, J., Konopka, P., Leino, M., Matoušek, V., Mistry A., K., McPeake, C. G., O'Donnell, D., Page R., D., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Saygı, B., Sedlák, M., Seweryniak, D., Scholey, C., Sorri, J., Špaček, A., Stolze, S., Taylor, M., Thornthwaite, A., Uusitalo, J., Veselský, M., Vielhauer, S., and Wearing, F. P.

Subjects
platina, isotoopit, ydinfysiikka, kulta
Abstract

The extremely neutron-deficient isotope 179Au has been studied by a combination of in-beam γ-ray and isomeric-decay spectroscopy. For in-beam spectroscopy, the recoil-isomer tagging technique was employed, using the known 3/2−, T1/2=328 ns isomer. A new rotational band, associated with the unfavored signature band of the 1h9/2⊕2f7/2 proton-intruder configuration, was revealed. A previously unknown, high-spin isomeric state with an excitation energy of 1743(17) keV and T1/2=2.16(8)µs was discovered. Five decay paths were identified, some of them feeding previously unknown non-yrast excited states, associated with the 1i13/2 proton-intruder configuration. Calculations based on the particle-plus-triaxial-rotor model were performed to interpret the data. On the basis of these calculations, the new 1h9/2⊕2f7/2 rotational band is interpreted as due to triaxial deformation of the underlying configuration with β2≈0.26 and γ≈27∘. Observed non-yrast states of the positive-parity 1i13/2 intruder configuration are interpreted as due to triaxial deformation with β2≈0.26 and γ≈20∘. peerReviewed

Published
2022

3. Single-particle and collective excitations in the transitional nucleus 166Os

Author

Stolze, S, primary, Grahn, T, additional, Julin, R, additional, Joss, D T, additional, Andgren, K, additional, Auranen, K, additional, Bönig, S, additional, Cox, D, additional, Darby, I G, additional, Doncel, M, additional, Eeckhaudt, S, additional, Greenlees, P T, additional, Hadinia, B, additional, Herzáň, A, additional, Jakobsson, U, additional, Jones, P, additional, Juutinen, S, additional, Ketelhut, S, additional, Konki, J, additional, Kröll, T, additional, Leppänen, A-P, additional, Nyman, M, additional, Page, R D, additional, Pakarinen, J, additional, Partanen, J, additional, McPeake, C G, additional, O’Donnell, D, additional, Peura, P, additional, Rahkila, P, additional, Ruotsalainen, P, additional, Sandzelius, M, additional, Sarén, J, additional, Saygı, B, additional, Scholey, C, additional, Simpson, J, additional, Sorri, J, additional, Taylor, M J, additional, Thornthwaite, A, additional, and Uusitalo, J, additional

Published
2021
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4. Single-particle and collective excitations in the transitional nucleus 166Os

Author

Stolze, Sanna, Grahn, Tuomas, Julin, R, Joss, D T, Andgren, K, Auranen, Kalle, Bönig, S, Cox, Daniel, Darby, I G, Doncel, M, Eeckhaudt, S, Greenlees, Paul T, Hadinia, B, Herzáň, Andrej, Jakobsson, Ulrika, Jones, P, Juutinen, Sakari, Ketelhut, S, Konki, Joonas, Kröll, T, Leppänen, A-P, Nyman, M, Page, R D, Pakarinen, J, Partanen, J, McPeake, C G, O’Donnell, D, Peura, Pauli, Rahkila, Panu, Ruotsalainen, Panu, Sandzelius, Mikael, Sarén, Jan, Saygı, B, Scholey, Catherine, Simpson, J, Sorri, Juha, Taylor, M J, Thornthwaite, A, and Uusitalo, Juha

Subjects
mean lifetimes, gamma-ray spectroscopy, mittaus, spektroskopia, kokeelliset menetelmät, collectivity, gammasäteily, fysiikka, Nuclear Experiment, RDDS measurements
Abstract

The mean lifetimes of the lowest energy 2+, 8+ and 9− states in 166Os have been measured using the recoil distance Doppler-shift method in conjunction with a selective recoil-decay tagging technique. These measurements extend studies into the most neutron-deficient mass region accessible to current experimental methods. The B(E2; 2+ → 0+) = 7(2) W.u. extracted from these measurements is markedly lower than those observed in the heavier even-mass Os isotopes. The 8+ and 9− states yield reduced transition probabilities that are consistent with single-particle transitions. While these values may indicate a departure from collective structure, the level scheme and the underlying nuclear configurations can also be interpreted in terms of a simple collective picture. This contrasting behaviour suggests an intriguing dichotomy in the description of heavy transitional nuclei. peerReviewed

Published
2021

5. High-spin states of ²¹⁸Th

Author

O'Donnell, D. (D.), Page, R. D. (R. D.), Grahn, T. (T.), Ali, F. A. (F. A.), Auranen, K. (K.), Capponi, L. (L.), Carroll, R. J. (R. J.), Chishti, M. M. (M. M. R.), Drummond, M. C. (M. C.), Greenlees, P. T. (P. T.), Henderson, J. (J.), Herzan, A. (A.), Jakobsson, U. (U.), Joss, D. T. (D. T.), Julin, R. (R.), Juutinen, S. (S.), Konki, J. (J.), Labiche, M. (M.), Leino, M. (M.), Mason, P. J. (P. J. R.), McPeake, C. G. (C. G.), Pakarinen, J. (J.), Papadakis, P. (P.), Partanen, J. (J.), Peura, P. (P.), Rahkila, P. (P.), Revill, J. (J.), Ruotsalainen, P. (P.), Sandzelius, M. (M.), Saren, J. (J.), Saygi, B. (B.), Scholey, C. (C.), Simpson, J. (J.), Smith, J. F. (J. F.), Smolen, M. (M.), Sorri, J. (J.), Stolze, S. (S.), Sullivan, C. M. (C. M.), Thornthwaite, A. (A.), Uusitalo, J. (J.), Kumar, A. (A.), and Srivastava, P. C. (P. C.)

Subjects
fusion-evaporation reactions, gamma-ray spectroscopy, shell model, alpha-decay, Nuclear Experiment, thorium
Abstract

High-spin states in the N = 128 nucleus ²¹⁸Th have been investigated following fusion–evaporation reactions, using the recoil-decay tagging technique. Due to the short-lived nature of the ground state of ²¹⁸Th prompt γ rays have been correlated with the α decay of the daughter nucleus ²¹⁴Ra. The level scheme representing the decay of excited states has been extended to (16⁺) with the observation of six previously unreported transitions. The observations are compared with the results of shell model calculations and within the context of the systematics of neighbouring nuclei.

Published
2020

6. High-spin states of 218Th

Author

O’Donnell, D, primary, Page, R D, additional, Grahn, T, additional, Ali, F A, additional, Auranen, K, additional, Capponi, L, additional, Carroll, R J, additional, Chishti, M M R, additional, Drummond, M C, additional, Greenlees, P T, additional, Henderson, J, additional, Herzan, A, additional, Jakobsson, U, additional, Joss, D T, additional, Julin, R, additional, Juutinen, S, additional, Konki, J, additional, Labiche, M, additional, Leino, M, additional, Mason, P J R, additional, McPeake, C G, additional, Pakarinen, J, additional, Papadakis, P, additional, Partanen, J, additional, Peura, P, additional, Rahkila, P, additional, Revill, J, additional, Ruotsalainen, P, additional, Sandzelius, M, additional, Sarén, J, additional, Sayği, B, additional, Scholey, C, additional, Simpson, J, additional, Smith, J F, additional, Smolen, M, additional, Sorri, J, additional, Stolze, S, additional, Sullivan, C M, additional, Thornthwaite, A, additional, Uusitalo, J, additional, Kumar, A, additional, and Srivastava, P C, additional

Published
2020
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7. De-excitation of the strongly coupled band in 177Au and implications for core intruder configurations in the light Hg isotopes

Author

Venhart, M., Ali, F. A., Ryssens, W., Wood, J. L., Joss, D. T., Andreyev, A. N., Auranen, K., Bally, B., Balogh, M., Bender, M., Carroll, R. J., Easton, J. L., Greenlees, P. T., Grahn, T., Heenen, P.-H., Herzáifmmode ecknelse n, A., Jakobsson, U., Julin, R., Juutinen, S., Kifmmode lelse ifmmode eckcelse c, D., Konki, J., Lawrie, E., Leino, M., Matouifmmode eckselse sek, V., McPeake, C. G., O'Donnell, D., Page, R. D., Pakarinen, J., Partanen, J., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., B., Sayifmmode gelse, Sedlák, M., Scholey, C., Sorri, J., Stolze, S., Thornthwaite, A., Uusitalo, J., Veselský, M., Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), 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), 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
atomit, nuklidit, Nuclear Theory, strongly coupled band, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], core intruder configurations, Nuclear Experiment, ydinfysiikka
Abstract

International audience; Excited states in the proton-unbound nuclide $^{177}$Au were populated in the $^92}$Mo($^{88}$Sr, p2n) reaction and identified using the Jurogam-II and GREAT spectrometers in conjunction with the RITU gas-filled separator at the University of Jyväskylä Accelerator Laboratory. A strongly coupled band and its decay path to the 11/2−α-decaying isomer have been identified using recoil-decay tagging. Comparisons with cranked Hartree-Fock-Bogoliubov (HFB) calculations based on Skyrme energy functionals suggest that the band has a prolate deformation and is based upon coupling the odd 1h11/2 proton hole to the excited 02+ configuration in the $^{178}$Hg core. Although these configurations might be expected to follow the parabolic trend of core Hg(02+) states as a function of neutron number, the electromagnetic decay paths from the strongly coupled band in $^{177}$Au are markedly different from those observed in the heavier isotopes above the midshell. This indicates that a significant change in the structure of the underlying A+1Hg core occurs below the neutron midshell.

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., Bäck, Torbjörn, Boening, S., Braunroth, T., Carroll, R. J., Cederwall, Bo, 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, Ulrika, 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., Bäck, Torbjörn, Boening, S., Braunroth, T., Carroll, R. J., Cederwall, Bo, 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, Ulrika, 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)., QC 20170821

Published
2017
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9. Identification of the J = 1− state in 218Ra populated via decay of 222Th

Author

Parr, Edward, Smith, J.F., Greenlees, P.T., Smolen, M., Papadakis, P., Auranen, K., Chapman, R, Cullen, David, Grahn, T, Grocutt, L., Herzberg, R-D, Hodge, D, Jakobsson, U, Julin, R., Juutinen, S, Konki, J, Leino, M, McPeake, C. G., Mengoni, D., Mistry, A, Mulholland, K. F., O'Neill, G.G., Pakarinen, J, Partanen, J., Peura, P, Rahkila, P., Ruotsalainen, P, Sandzelius, M., Saren, J., Scheck, M, Scholey, C., Sorri, J., Stolze, S., Taylor, Michael J, and Uusitalo, J.

Subjects
Nuclear Theory
Abstract

The α decay of Th222 populating the low-lying Jπ=3− state, and also a proposed 1− state, in Ra218 has been observed. The observations suggest an excitation energy of 853 keV for the 1− state, which is 60 keV above the 3− state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the Jπ=1− and 3− states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

Published
2016
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10. Reduced transition probabilities along the yrast line in W166

Author

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

Published
2017
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11. De-excitation of the strongly coupled band in Au177 and implications for core intruder configurations in the light Hg isotopes

Author

Venhart, M., primary, Ali, F. A., additional, Ryssens, W., additional, Wood, J. L., additional, Joss, D. T., additional, Andreyev, A. N., additional, Auranen, K., additional, Bally, B., additional, Balogh, M., additional, Bender, M., additional, Carroll, R. J., additional, Easton, J. L., additional, Greenlees, P. T., additional, Grahn, T., additional, Heenen, P.-H., additional, Herzáň, A., additional, Jakobsson, U., additional, Julin, R., additional, Juutinen, S., additional, Kĺč, D., additional, Konki, J., additional, Lawrie, E., additional, Leino, M., additional, Matoušek, V., additional, McPeake, C. G., additional, O'Donnell, D., additional, Page, R. D., additional, Pakarinen, J., additional, Partanen, J., additional, Peura, P., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Sayği, B., additional, Sedlák, M., additional, Scholey, C., additional, Sorri, J., additional, Stolze, S., additional, Thornthwaite, A., additional, Uusitalo, J., additional, and Veselský, M., additional

Published
2017
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12. A NEW PLUNGER DEVICE FOR INVESTIGATING THE EFFECTS OF DEFORMATION ON PROTON EMISSION RATES VIA LIFETIME MEASUREMENTS

Author

TAYLOR, M. J., primary, CULLEN, D. M., additional, SMITH, A. J., additional, MCFARLANE, A., additional, TWIST, V., additional, PROCTER, M. G., additional, ALHARSHAN, G. A., additional, BRAUNROTH, T., additional, DEWALD, A., additional, ELLINGER, E., additional, FRANSEN, C., additional, BUTLER, P. A., additional, SCHECK, M., additional, JOSS, D. T., additional, SAYGI, B., additional, MCPEAKE, C. G., additional, GRAHN, T., additional, GREENLEES, P. T., additional, JAKOBSSON, U., additional, JONES, P., additional, JULIN, R., additional, JUUTINEN, S., additional, KETELHUT, S., additional, LEINO, M., additional, NIEMINEN, P., additional, PAKARINEN, J., additional, PEURA, P., additional, RAHKILA, P., additional, RUOTSALAINEN, P., additional, SANDZELIUS, M., additional, SARÉN, J., additional, SCHOLEY, C., additional, SORRI, J., additional, STOLZE, S., additional, and UUSITALO, J., additional

Published
2013
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