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| 2. |
- Mach, H., et al.
(author)
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New structure information on Mg-30, Mg-31 and Mg-32
- 2005
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In: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-601X .- 1434-6001. ; 25, s. 105-109
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Conference paper (peer-reviewed)abstract
- The fast timing beta gamma gamma(t) method was applied to investigate the level lifetimes in Mg-30,Mg-31,Mg-32. Levels in Mg have been populated in beta and beta-delayed neutron emission of Na, at the ISOLDE facility. From the gamma gamma coincidences a number of new states have been identified and new level schemes were constructed for 30 31,32 Mg. The following preliminary half lives have been determined: T-1/2 = 3.9(4) ns for the 1789 keV state in Mg-30, T-1/2 = 133(8) ps and 10.5(8) us for the 221 keV and 461 keV states in Mg-31, respectively, and T1/2 = 16(4) ps for the 885 keV level in 32Mg. The 1789 keV level was established as a candidate for the intruder 0(+) configuration in Mg-30 with a possible strong E0 branch to the ground state.
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| 3. |
- Mach, H., et al.
(author)
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On the enhanced E1 transitions in the K=3/2 parity doublet band in Ra-223
- 2016
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In: European Physical Journal A. - : Springer Science and Business Media LLC. - 1434-6001 .- 1434-601X. ; 52:6
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Journal article (peer-reviewed)abstract
- We have applied the fast timing beta gamma gamma(t) technique to remeasure lifetimes of selected states in Ra-223 populated in the beta(-) decay of Fr-223. T-1/2 = 587(12) ps and 210(13) ps have been obtained for the 3/2(-) and 5/2(-) states at 50.1 and 79.7 keV, that are more accurate than the previous values of 630(70) ps and 166(55) ps, respectively. Our vertical bar D0 vertical bar value of 0.155(10) e.fm obtained for the K = 3/2 configuration together with the available values of vertical bar D0 vertical bar for the K = 1/2 and K = 5/2 parity doublet bands establish the configuration dependence of vertical bar D0 vertical bar at low spins in this nucleus. Results of theoretical calculations performed for Ra-223, using the quasiparticle-phonon model (QPM) with inclusion of the Coriolis coupling, reasonably well reproduce octupole correlations in this nucleus.
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| 4. |
- Aas, AJ, et al.
(author)
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Enhanced and quenched B(E1) transition rates between parity doublet bands in Ra-227
- 1996
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In: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 611:2-3, s. 281-314
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Journal article (peer-reviewed)abstract
- The fast timing beta gamma gamma(t) method has been used to measure level lifetimes in the parity doublet bands in Ra-227 populated in the beta(-) decay of Fr-227. In particular, T-1/2 = 254(9) ps, 236(30) ps, less than or equal to 41 ps and 16(13) ps hav
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| 5. |
- Aas, AJ, et al.
(author)
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Quenched E1 transition rates in Th-231
- 1999
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In: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 654:3-4, s. 499-522
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Journal article (peer-reviewed)abstract
- The fast timing beta gamma gamma(t) method has been used to measure lifetimes of the low-lying levels in Th-231 populated in the beta(-) decay of Ac-231. The half-life of the K-pi = 5/2(-) band-head at 185.7-keV was measured as T-1/2 = 1073(79) ps, yieldi
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| 6. |
- Fogelberg, T., et al.
(author)
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Energy Efficient Transformers and Reactors : Some incentive models and case studies to show the long term profitability of such designs
- 2012
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In: CIGRE 2012 Proceedings. - Paris, France : CIGRE (International Council on Large Electric Systems).
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Conference paper (other academic/artistic)abstract
- During the coming decades energy efficiency will be a critical factor in reducing carbon emissions and fighting global warming. The power generation industry and transmission and distribution industries (T&D) contribute to a large part of energy losses in the society. The losses in T&D systems alone are total 10 % of a global average of the T&D energy transferred. One-third of these T&D losses have their origin in transformers and shunt reactors.This report emphasizes the need to bring in appropriate financial incentives and directives to utilities, in order to encourage investment in energy efficient electrical power systems. A critical financial parameter is the internal interest rate. In some countries there are directives from the authorities that internalinterest rates shall be 5 %. If this is to be applied together with the current prevailing electricityprices in Europe, capitalized cost of total transformer losses should increase by 2-3times of the average value used in the European market today. It isshown that the capitalized cost of losses may vary from 8,000 to 17,000 €/kW today or even higherin the future.This paper highlights cases where low and high capitalized costs of losses are used and the implications for cost related factors of transformer and shunt reactor are analyzed. It isshown that the transformer losses and total ownership cost (TOC) can be substantially reduced with an increase in price(first cost) of the transformers or shunt reactors. With increased value of losses, accuracy of loss measurement will play a much more important business role and require action to improve International Standards. New energy efficientsolutions to combat network losses will require further research and development. Different focus and strategies regarding interest rates and electricityprices in transmission companies lead to very different investment decisions. Without clear regulations promoting reductions in power loss, there might notbe enough incentive for more aggressive innovation in the field of transformer and electrical system technology and efficiency.
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| 7. |
- Fraile, LM, et al.
(author)
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Octupole correlations in Ra-229
- 1999
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In: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 657:4, s. 355-390
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Journal article (peer-reviewed)abstract
- The structure of Ra-229 has been studied in the beta(-) decay of Fr-229. Spins and parities have been determined from the conversion electron measurements, while half-lives for the 137.5, 142.7, 168.8, 213.0 and 479.0 keV levels have been measured in the
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| 8. |
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| 9. |
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| 10. |
- Gulda, K, et al.
(author)
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Quadrupole deformed and octupole collective bands in Ra-228
- 1998
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In: NUCLEAR PHYSICS A. - : ELSEVIER SCIENCE BV. - 0375-9474. ; 636:1, s. 28-46
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Journal article (peer-reviewed)abstract
- Spins and parities for collective states in Ra-228 have been determined from conversion electron measurements with a mini-orange beta spectrometer. The fast-timing beta gamma gamma(t) method has been used to measure lifetimes of T-1/2 = 550(20) ps and 181
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