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Journal Articles

Structure of $$^{33}$$Mg sheds new light on the $$N$$=20 island of inversion

Kanungo, R.*; Nociforo, C.*; Prochazka, A.*; Utsuno, Yutaka; Aumann, T.*; Boutin, D.*; Cortina-Gil, D.*; Davids, B.*; Diakaki, M.*; Farinon, F.*; et al.

Physics Letters B, 685(4-5), p.253 - 257, 2010/05

https://doi.org/10.1016/j.physletb.2010.02.008
 Times Cited Count：37 Percentile：86.47(Astronomy & Astrophysics)

no abstracts in English

Journal Articles

Spectroscopy of $$^{257}$$Rf

Qian, J.*; Heinz, A.*; Khoo, T. L.*; Janssens, R. V. F.*; Peterson, D.*; Seweryniak, D.*; Ahmad, I.*; Asai, Masato; Back, B. B.*; Carpenter, M. P.*; et al.

Physical Review C, 79(6), p.064319_1 - 064319_13, 2009/06

https://doi.org/10.1103/PhysRevC.79.064319
 Times Cited Count：35 Percentile：85.45(Physics, Nuclear)

$$alpha$$-, $$gamma$$-, and conversion electron spectroscopy experiments for $$^{257}$$Rf have been performed using Fragment Mass Analyzer at Argonne National Laboratory. A new isomer with a half-life of 160 $$mu$$s has been discovered in $$^{257}$$Rf, and it is interpreted as a three-quasiparticle high-$$K$$ isomer. Neutron configurations of one-quasiparticle states in $$^{253}$$No, the $$alpha$$-decay daughter of $$^{257}$$Rf, have been assigned on the basis of $$alpha$$-decay hindrance factors. Excitation energies of the 1/2$$^{+}$$[620] states in $$N$$=151 isotones indicate that the deformed shell gap at $$N$$=152 increases with the atomic number.

Journal Articles

One-neutron removal measurement reveals $$^{24}$$O as a new doubly magic nucleus

Kanungo, R.*; Nociforo, C.*; Prochazka, A.*; Aumann, T.*; Boutin, D.*; Cortina-Gil, D.*; Davids, B.*; Diakaki, M.*; Farinon, F.*; Geissel, H.*; et al.

Physical Review Letters, 102(15), p.152501_1 - 152501_4, 2009/04

https://doi.org/10.1103/PhysRevLett.102.152501
 Times Cited Count：181 Percentile：96.80(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

The $$T=2$$ mirrors $$^{36}$$Ca and $$^{36}$$S; A Test for isospin symmetry of shell gaps at the driplines

Doornenbal, P.*; Reiter, P.*; Grawe, H.*; Otsuka, Takaharu*; Al-Khatib, A.*; Banu, A.*; Beck, T.*; Becker, F.*; Bednarczyk, P.*; Benzoni, G.*; et al.

Physics Letters B, 647(4), p.237 - 242, 2007/04

https://doi.org/10.1016/j.physletb.2007.02.001
 Times Cited Count：35 Percentile：86.72(Astronomy & Astrophysics)

The first excited state of $$^{36}$$Ca was measured at GSI for the first time. The measured $$2^+_1$$ energy is found to be 3015(16) keV, which is lower than its mirror nucleus $$^{36}$$S by as large as 276 keV. The structure of those nuclei is studied by the shell model. It is found that those nuclei can be well described by the $$sd$$ valence space. The large energy shift between them is caused by the Thomas-Ehrman effect. We presented that the energy shift in the $$sd$$ shell region can be explained by the shell model with a phenomenological treatment of the Thomas-Ehrman effect.

Oral presentation

Analysis of $$^{90}$$Sr in environmental samples at the attogram-level by accelerator mass spectrometry

Martschini, M.*; Honda, Maki; Merchel, S.*; Winkler, S.*; Golser, R.*

no journal, , 

The quantitative analysis of $$^{90}$$Sr is cumbersome and time-consuming because it is a pure $$beta$$-ray emitter. The detection limit of $$^{90}$$Sr by conventional accelerator mass spectrometry (AMS) methods is comparable to the typical detection limit of 3 mBq for $$beta$$-ray detection methods, mainly due to the interference of the isobaric $$^{90}$$Zr. The worldwide unique Ion Laser Interaction Mass Spectrometry (ILIAMS), performed at the University of Vienna, effectively removes $$^{90}$$Zr with a laser and reaction gases. Therefore, the detection limits of $$^{90}$$Sr is superior ($$<$$0.1 mBq) to conventional AMS systems not equipped with such an ion-laser interaction isobaric removal system. In this study, $$^{90}$$Sr analysis in coral samples etc., an environmental sample under extreme conditions (e.g. low concentrations of $$mu$$Bq/g and limited sample volumes of grams), was tried. To lower the detection limit $$<$$0.1 mBq, Sr was purified (Sr carrier) from old age coral with almost no $$^{90}$$Sr contamination from atmospheric nuclear tests, chemical separation of environmental samples were conducted, and $$^{90}$$Sr was measured by AMS. The results showed that the detection limit of $$^{90}$$Sr achieved in the analysis was $$<$$0.03 mBq ($$^{90}$$Sr/Sr $$<$$5$$times$$10$$^{-16}$$, 1/100 of the $$beta$$-ray detection methods). The detection limit achieved in this study corresponds to 2 ag of $$^{90}$$Sr in 1 mg of Sr target. The latest results of highly sensitive $$^{90}$$Sr analysis in small amounts of general environmental samples (coral, seawater, etc.) are mainly presented.

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