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Jakobsson, Ulrika
Publications (4 of 4) Show all publications
Parr, E., Page, R. D., Joss, D. T., Ali, F. A., Auranen, K., Capponi, L., . . . Uusitalo, J. (2018). Fine structure in the alpha decay of high-spin isomers in Lu-155 and Hf-156. Physical Review C: Covering Nuclear Physics, 98(2), Article ID 024321.
Open this publication in new window or tab >>Fine structure in the alpha decay of high-spin isomers in Lu-155 and Hf-156
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2018 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 98, no 2, article id 024321Article in journal (Refereed) Published
Abstract [en]

Fine structure in the a decay of high-spin isomers in Lu-155( 25/2(-)) and Hf-156(8(+))has been studied for the first time using alpha gamma- coincidence analysis. Three new a decays from Lu-155(25/2(-)) and two from Hf-156(8(+)) have been identified, populating seniority s > 1 states in the N = 82 nuclei Tm-151 and Yb-152, respectively. The reduced hindrance factors of the a decays support the previous configuration assignments of the populated states. This is the first observation of states with excitation energy greater than 1.5 MeV being populated following a decay in nuclei outside of the Pb-208 region.

Place, publisher, year, edition, pages
American Physical Society, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-240198 (URN)10.1103/PhysRevC.98.024321 (DOI)000443095800003 ()
Note

QC 20181218

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved
Auranen, K., Uusitalo, J., Juutinen, S., Badran, H., Bisso, F. D., Cox, D., . . . Wang, Y. K. (2018). Prompt and delayed spectroscopy of At-203: Observation of a shears band and a 29/2(+) isomeric state. Physical Review C: Covering Nuclear Physics, 97(2), Article ID 024301.
Open this publication in new window or tab >>Prompt and delayed spectroscopy of At-203: Observation of a shears band and a 29/2(+) isomeric state
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2018 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 97, no 2, article id 024301Article in journal (Refereed) Published
Abstract [en]

Using fusion-evaporation reactions, a gas-filled recoil separator, recoil-gating technique and recoil-isomer decay tagging technique we have extended the level scheme of At-203 (N = 118) significantly. We have observed an isomeric [tau = 14.1(3) mu s] state with a spin and parity of 29/2(+). The isomeric state is suggested to originate from the pi(h(9/2)) circle times |Po-202; 11(-)> coupling, and it is depopulated through 286 keV E2 and 366 keV E3 transitions. In addition, we have observed a cascade of magnetic-dipole transitions which is suggested to be generated by the shears mechanism.

Place, publisher, year, edition, pages
American Physical Society, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-223265 (URN)10.1103/PhysRevC.97.024301 (DOI)000424056700001 ()
Funder
EU, FP7, Seventh Framework Programme, 262010
Note

QC 20180219

Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-02-19Bibliographically approved
Badran, H., Scholey, C., Uusitalo, J., Auranen, K., Grahn, T., Greenlees, P. T., . . . Stolze, S. (2017). Decay spectroscopy of Pb-179(82)97 and evidence for a 9/2(-) intruder state in Tl-179(81)98. Physical Review C: Covering Nuclear Physics, 96(6), Article ID 064314.
Open this publication in new window or tab >>Decay spectroscopy of Pb-179(82)97 and evidence for a 9/2(-) intruder state in Tl-179(81)98
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2017 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 96, no 6, article id 064314Article in journal (Refereed) Published
Abstract [en]

The very neutron-deficient isobars Pb-179 and Tl-179 have been produced using the fusion-evaporation reactions Pd-104(Kr-78,xpyn), where x <= 1 and y >= 2. The gas-filled separator RITU was employed to transport and separate the recoiling nuclei of interest from the scattered beam and unwanted products. The GREAT spectrometer was used to study the decay properties through alpha-alpha and alpha-gamma correlations, which has allowed the ground state of Pb-179 to be assigned as I-pi = 9/2(-). The decay of Pb-179 was measured to have an alpha-particle energy and half-life of E-alpha = 7348(5) keV and t(1/2) = 2.7(2) ms, respectively. A search for a nu i(13/2) state in Pb-179 was performed, but only a limit of excitation energy and half-life was obtained. In Tl-179 a t(1/2) = 114(-10)(+18) ns isomeric state, likely at an excitation energy of 904.5(9) keV, was identified and is tentatively assigned to be a 9/2(-) proton intruder state.

National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-220594 (URN)10.1103/PhysRevC.96.064314 (DOI)000418199600004 ()2-s2.0-85039971542 (Scopus ID)
Note

QC 20180117

Available from: 2018-01-17 Created: 2018-01-17 Last updated: 2018-01-17Bibliographically approved
Doncel, M., Cederwall, B., Qi, C., Li, H. J., Jakobsson, U., Auranen, K., . . . Uusitalo, J. (2017). Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei. Physical Review C: Covering Nuclear Physics, 95(4), Article ID 044321.
Open this publication in new window or tab >>Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei
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2017 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 95, no 4, article id 044321Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
American Physical Society, 2017
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-207673 (URN)10.1103/PhysRevC.95.044321 (DOI)000400140500006 ()2-s2.0-85018532567 (Scopus ID)
Funder
Swedish Research Council, 621-2014-5558EU, FP7, Seventh Framework Programme, 262010 ENSAR
Note

QC 20170601

Available from: 2017-06-01 Created: 2017-06-01 Last updated: 2017-11-29Bibliographically approved
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