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1. Nanosecond-Scale Proton Emission from Strongly Oblate-Deformed ^{149}Lu

Author

Auranen, K., Briscoe, A. D., Ferreira, L. S., Grahn, T., Greenlees, P. T., Herzáň, A., Illana, A., Joss, D. T., Joukainen, H., Julin, R., Jutila, H., Leino, M., Louko, J., Luoma, M., Maglione, E., Ojala, J., Page, R. D., Pakarinen, J., Rahkila, P., Romero, J., Ruotsalainen, P., Sandzelius, M., Sarén, J., Tolosa-Delgado, A., Uusitalo, J., and Zimba, G.

Subjects
protonit, Physics::Accelerator Physics, Nuclear Experiment, ydinfysiikka, emissio (fysiikka)
Abstract

Using the fusion-evaporation reaction ^{96}Ru(^{58}Ni,p4n)^{149}Lu and the MARA vacuum-mode recoil separator, a new proton-emitting isotope ^{149}Lu has been identified. The measured decay Q value of 1920(20) keV is the highest measured for a ground-state proton decay, and it naturally leads to the shortest directly measured half-life of 450_{-100}^{+170} ns for a ground-state proton emitter. The decay rate is consistent with l_{p}=5 emission, suggesting a dominant πh_{11/2} component for the wave function of the proton-emitting state. Through nonadiabatic quasiparticle calculations it was concluded that ^{149}Lu is the most oblate deformed proton emitter observed to date.

Published
2021

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

Author

Smallcombe, J., Davies, P.J., Barton, C.J., Jenkins, D.G., Andersson, L.L., Butler, P.A., Cox, D.M., Herzberg, R.-D., Mistry, A., Parr, E., Grahn, T., Greenlees, P.T., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lopez-Martens, A., Nieminen, P., Pakarinen, J., Papadakis, P., Peura, P., Rahkila, P., Rinta-Antila, S., Ruotsalainen, P., Sandzelius, M., Sarén, J., Scholey, C., Sorri, J., and Uusitalo, J.

Subjects
Nuclear and High Energy Physics
Published
2014
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3. Collective excitations in the transitional nuclei Re 163 and Re 165

Author

Davis-Merry, TR, Joss, DT, Page, RD, Simpson, J, Paul, ES, Ali, FA, Bianco, L, Carroll, RJ, Cederwall, B, Darby, IG, Drummond, MC, Eeckhaudt, S, Ertürk, S, Gómez-Hornillos, MB, Grahn, T, Greenlees, PT, Hadinia, B, Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Leino, M, Nieminen, P, Nyman, M, O'Donnell, D, Pakarinen, J, Peura, P, Rahkila, P, Revill, JP, Ruotsalainen, P, Sandzelius, M, Sapple, PJ, Sarén, J, Sayʇi, B, Scholey, C, Sorri, J, Thomson, J, and Uusitalo, J

Subjects
Nuclear Theory, Nuclear Experiment, Nuclear & Particles Physics
Abstract

© 2015 American Physical Society. Excited states in the neutron-deficient nuclei 75163Re88 and 75165Re90 were populated in the 106Cd(60Ni,p2nγ) and 92Mo(78Kr, 3p2nγ) fusion-evaporation reactions at bombarding energies of 270 and 380 MeV, respectively. γ rays were detected at the target position using the JUROGAM spectrometer while recoiling ions were separated in-flight by the RITU gas-filled recoil separator and implanted in the GREAT spectrometer. The energy level schemes for Re163 and Re165 were identified using recoil-decay correlation techniques. At low spin, the yrast bands of these isotopes consist of signature partner bands based on a single πh11/2 quasiproton configuration. The bands display large energy splitting consistent with the soft triaxial shape typical of transitional nuclei above N=82. The configurations of the excited states are proposed within the framework of the cranked shell model.

Published
2015

4. Competing decay modes of a high-spin isomer in the proton-unbound nucleus 158Ta

Author

Carroll, RJ, Page, RD, Joss, DT, Uusitalo, J, Darby, IG, Andgren, K, Cederwall, B, Eeckhaudt, S, Grahn, T, Gray-Jones, C, Greenlees, PT, Hadinia, B, Jones, PM, Julin, R, Juutinen, S, Leino, M, Leppänen, AP, Nyman, M, O'Donnell, D, Pakarinen, J, Rahkila, P, Sandzelius, M, Sarén, J, Scholey, C, Seweryniak, D, and Simpson, J

Subjects
High Energy Physics::Experiment, Nuclear & Particles Physics
Abstract

An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) μs and changes the spin by 11h. In this paper, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.

Published
2015

5. $��$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$Ru

Author

Zheng, Y., de France, G., Cl��ment, E., Dijon, A., Cederwall, B., Wadsworth, R., B��ck, T., Moradi, F. Ghazi, Jaworski, G., Nyak��, B. M., Nyberg, J., Palacz, M., Al-Azri, H., de Angelis, G., Atac, A., Akta��, ��., Bhattacharyya, S., Brock, T., Davies, P. J., Di Nitto, A., Dombradi, Zs., Gadea, A., Gal, J., Joshi, P., Juhasz, K., Julin, R., Jungclaus, A., Kalinka, G., Kownacki, J., La Rana, G., Lenzi, S. M., Molnar, J., Moro, R., Napoli, D. R., Singh, B. S. Nara, Persson, A., Recchia, F., Sandzelius, M., Scheurer, J. -N., Sletten, G., Sohler, D., S��derstr��m, P. -A., Taylor, M. J., Timar, J., Valiente-Dobon, J. J., and Vardaci, E.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

Linear polarization measurements have been performed for $��$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$��$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $��$-$��$ coincidences, $��$-ray linear polarization and $��$-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3$-$1.3 MeV. Several transitions have been observed for the first time. Measurements of linear polarization and angular distribution have led to the firm assignments of spin differences and parity of high-spin states in $^{91}$Ru. More specifically, calculations using a semi-empirical shell model were performed to understand the structures of the first and second (21/2$^{+}$) and (17/2$^{+}$) levels. The results are in good agreement with the experimental data, supporting the interpretation of the non yrast (21/2$^{+}$) and (17/2$^{+}$) states in terms of the $J_{\rm max}$ and $J_{\rm max}-2$ members of the seniority-three $��(g_{9/2})^{-3}$ multiplet., 19 pages, 8 figures, 2 tables

Published
2013
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6. Shell-Structure and Pairing Interaction in Superheavy Nuclei: Rotational Properties of the Z=104 Nucleus Rf-256

Author

Greenlees, PT, Rubert, J, Piot, J, Gall, B J P, Andersson, L L, Asai, M, Asfari, Z, Cox, D M, Dechery, F, Dorvaux, O, Grahn, T, Hauschild, K, Henning, G, Herzan, A, Herzberg, R D, Hessberger, F P, Jakobsson, U, Jones, P, Julin, R, Juutinen, S, Ketelhut, S, Khoo, T L, Leino, M, Ljungvall, J, Lopez-Martens, A, Lozeva, R, Nieminen, P, Pakarinen, J, Papadakis, P, Parr, E, Peura, P, Rahkila, P, Rinta-Antila, S, Ruotsalainen, P, Sandzelius, M, Saren, J, Scholey, C, Seweryniak, D, Sorri, J, Sulignano, B, Theisen, Ch, Uusitalo, J, and Venhart, M

Subjects
Nuclear Physics - Experiment
Published
2012

7. Coulomb excitation of $^{116}$Te and $^{118}$Te: A study of collectivity above the Z=50 shell gap

Author

Ahn, T, Al-Azri, H, Bloch, T, Butler, P A, Bree, N, Back, T, Bonig, S, Cederkall, J, Cederwall, B, Darby, I G, Diriken, J, O'Donnell. D, Fahlander, C, Gaffney, L P, Grahn, T, Hadinia, B, Huyse, M, Jenkins, D G, Johnson, A, Joshi, P, Joss, D T, Julin, R, Kroll, T, Leske, J, Nara Singh, B S, Nicholls. A, Page, R D, Pakarinen, J, Paul, E S, Pietralla, N, Rahkila, P, Rapisarda, E, Sandzelius, M, Scheck, M, Simpson, J, Smith, J F, Wadsworth, R, Van Duppen, P, Voulot, D, Wenander, F, and Werner, V

Subjects
Detectors and Experimental Techniques
Published
2011

8. Studies of collectivity and single-particle behaviour in Te nuclei above the the N=50 shell gap

Author

Cederwall, B, Butler, P A, Bäck, T, Cederkäll, J, Darby, I G, Di Julio, D, Fahlander, C, Grahn, T, Hadinia, B, Huyse, M, Julin, R, Jenkins, D G, Johnson, A, Joss, D T, Leske, J, Nara Singh, B S, O'Donnell, D, Page, R D, Pakarinen, J, Sandzelius, M, Scheck, M, Scholey, C, Simpson, J, Smith, J F, Van Duppen, P, Wadsworth, R, Wenander, F, Liotta, R, and Qi, C

Subjects
Detectors and Experimental Techniques
Published
2010

9. Coulomb excitation of $^{116}$Te: a study of collectivity above the $Z = 50$ shell gap

Author

Grahn, T, Pakarinen, J, Wenander, F, Bäck, T, Cederwall, B, Johnson, A, Bree, N, Darby, I G, Diriken,J, Huyse, M, Van Duppen, P, O’Donnell, D, Simpson, J, Julin, R, Rahkila, P, Sandzelius, M, Butler, P A, Gaffney, L P, Joss, D T, Page, R D, Paul, E S, Scheck, M, Cederkäll, J, Ekström, A, Fahlander, C, Hadinia, B, Smith, J F, Jenkins, D G, Nara Singh, B S, and Wadsworth, R

Subjects
Detectors and Experimental Techniques
Published
2010

10. Experimental investigation of the 0(2)(+) band in Sm-154 as a beta-vibrational band

Author

Smallcombe, J., Davies, P. J., Barton, C. J., Jenkins, D. G., Andersson, L. L., Butler, P. A., Cox, D. M., Herzberg, R. D., Mistry, A., Parr, E., Grahn, T., Greenlees, P. T., Hauschild, K., Herzan, A., Jakobsson, U., Jones, P., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Lopez-Martens, A., Nieminen, P., Pakarinen, J., Papadakis, P., Peura, P., Rahkila, P., Rinta-Antila, S., Ruotsalainen, P., Sandzelius, M., Saren, J., Catherine Scholey, Sorri, J., Uusitalo, J., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), and Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM)

Subjects
Internal conversion electrons, EXCITATIONS, NUCLEI, Gamma ray, Electric monopole, Rare-earth, 0(+) STATES, GAMMA, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Collective models, ELECTRIC MONOPOLE TRANSITIONS, Spectroscopy
Abstract

A study of Sm-154 through gamma-ray and internal conversion electron coincidence measurements was performed using the Silicon And GErmanium spectrometer (SAGE). An upper limit for the rho(2)(E0; 2(2)(+) -> 2(1)(+)) and measurement of the rho(2) (E0; 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 beta-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 beta vibration is questionable. (C) 2014 The Authors. Published by Elsevier B.V.

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11. The northwest frontier: Spectroscopy of N ∼ Z nuclei below mass 100

Author

Wadsworth, R., Nara Singh, B. N., Steer, A. N., Jenkins, D. G., Bentley, M. A., Brock, T., Davies, P., Glover, R., Pattabiraman, N. S., Scholey, C., Grahn, T., Greenlees, P. T., Jones, P., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Leino, M., Nyman, M., Perua, P., Janne Pakarinen, Rahkila, P., Ruotslainen, P., Sorri, J., Uusitalo, J., Lister, C. J., Butler, P. A., Dimmock, M., Joss, D. T., Thomson, J., Rinta-Antila, S., Cederwall, B., Hadinia, B., Sandzelius, M., Atac, A., Betterman, L., Blazhev, A., Braun, N., Finke, F., Geibel, K., Ilie, G., Iwasaki, H., Jolie, J., Reiter, P., Scholl, C., Warr, N., Boutachkov, P., Caceres, L., Domingo, C., Engert, T., Farinon, F., Gerl, J., Goel, N., Gorska, M., Grawe, H., Kurz, N., Kojuharov, I., Pietri, S., Nociforo, C., Prochazka, A., Wollersheim, H. -J, Eppinger, K., Faestermann, T., Hinke, C., Hoischen, R., Kruecken, R., Gottardo, A., Liu, Z., Woods, P., Grebosz, J., Merchant, E., Nyberg, J., Soderstrom, P. -A, Podolyak, Z., Regan, P., Steer, S., Pfutzner, M., and Rudolph, D.

Subjects
Subatomic Physics
Abstract

The spectroscopy and structure of excited states of N similar to Z nuclei in the mass 70-100 region has been investigated using two techniques. In the A similar to 70-80 region fusion evaporation reactions coupled with the recoil-beta-tagging method have been employed at Jyvaskyla to study low-lying states in odd-odd N = Z nuclei. Results from these and other data for known odd-odd nuclei above mass 60 will be discussed. In the heavier mass 90 region a fragmentation experiment has been performed using the RIS-ING/FRS setup at GSI. This experiment was primarily aimed at searching for spin gap isomers in nuclei around A similar to 96. The objectives of the latter experiment will be discussed.

12. Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd

Author

Anton Khaplanov, J. Gal, Pär-Anders Söderström, B. M. Nyakó, E. Vardaci, H. Al-Azri, Pankaj S. Joshi, Tina Penick Brock, Karin Lagergren, E. Clément, P. J. Davies, Dóra Sohler, S. Bhattacharyya, Gábor Kalinka, R. Moro, Michael Taylor, F. Johnston-Theasby, Zs. Dombrádi, Roberto Liotta, K. Andgren, Torbjörn Bäck, A. Johnson, S. O. Kara, G. de Angelis, D. R. Napoli, Alejandro Algora, J. Blomqvist, A. Jungclaus, Chong Qi, A. Gadea, F. Recchia, Johan Nyberg, S. M. Lenzi, J. R. Brown, J. Timár, Bo Cederwall, G. La Rana, J. N. Scheurer, A. Di Nitto, Baharak Hadinia, J. Kownacki, S. Williams, M. Palacz, J. J. Valiente-Dobon, R. Julin, R. Wadsworth, A. Atac, Jozsef Molnar, B. S. Nara Singh, G. Sletten, F. Ghazi Moradi, M. Sandzelius, K. Juhasz, G. Jaworski, A. Dijon, A. Persson, 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), Excitations Nucléaires par Laser (ENL), 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)-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), Cederwall, B., Ghazi Moradi, F., Bäck, T., Johnson, A., Blomqvist, J., Clément, E., de France, G., Wadsworth, R., Andgren, K., Lagergren, K., Dijon, A., Jaworski, G., Liotta, R., Qi, C., Nyakó, B. M., Nyberg, J., Palacz, M., Al Azri, H., Algora, A., de Angelis, G., Ataç, A., Bhattacharyya, S., Brock, T., Brown, J. R., Davies, P., Di Nitto, A., Dombrádi, Z. s., Gadea, A., Gál, J., Hadinia, B., Johnston Theasby, F., Joshi, P., Juhász, K., Julin, R., Jungclaus, A., Kalinka, G., Kara, S. O., Khaplanov, A., Kownacki, J., LA RANA, Giovanni, Lenzi, S. M., Molnár, J., Moro, RENATA EMILIA MARIA, Napoli, D. R., Nara Singh, B. S., Persson, A., Recchia, F., Sandzelius, M., Scheurer, J. N., Sletten, G., Sohler, D., Söderström, P. A., Taylor, M. J., Timár, J., Valiente Dobón, J. J., Vardaci, Emanuele, and Williams, S.

Subjects
Nuclear Theory, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], pairing, Nuclear Theory (nucl-th), Magic number (programming), spin-alignement, Physics::Atomic and Molecular Clusters, Nuclear force, Neutron, Nuclear structure, Nuclear Experiment (nucl-ex), Spin (physics), Nuclear Experiment, Physics, Multidisciplinary, ta114, Nuclear shell model, Atomic nucleus, Física nuclear, Atomic physics
Abstract

4 páginas, 4 figuras.-- El Pdf es la versión pre-print.-- et al., Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work that introduced a strong spin–orbit interaction to the nuclear shell model potential. However, knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers (N = Z), enhanced correlations arise between neutrons and protons (two distinct types of fermions) that occupy orbitals with the same quantum numbers. Such correlations have been predicted to favour an unusual type of nuclear superfluidity, termed isoscalar neutron–proton pairing, in addition to normal isovector pairing. Despite many experimental efforts, these predictions have not been confirmed. Here we report the experimental observation of excited states in the N = Z = 46 nucleus 92Pd. Gamma rays emitted following the 58Ni(36Ar,2n)92Pd fusion–evaporation reaction were identified using a combination of state-of-the-art high-resolution γ-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron–proton coupling scheme, different from the previous prediction. We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling) in the ground and low-lying excited states of the heaviest N = Z nuclei. Such strong, isoscalar neutron–proton correlations would have a considerable impact on the nuclear level structure and possibly influence the dynamics of rapid proton capture in stellar nucleosynthesis., This work was supported by the Swedish Research Council (contract nos 2007-4067 and 2008-5793), the Göran Gustafsson Foundation, the European Union Sixth Framework Programme ‘Integrating Infrastructure Initiative – Transnational Access’ (no. 506065; EURONS), the Hungarian Scientific Research Fund, OTKA (contract nos. K72566 and K68801), the UK Science and Technology Facilities Council (STFC), the Polish Ministry of Science and Higher Education (grant no. N N202 073935), the Spanish Ministerio de Ciencia e Innovación (contract no. FPA2007-66069), the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042), and Ankara University BIYEP project no. DPT 2005120140.

Published
2011
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