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Population of a low-spin positive-parity band from high-spin intruder states in $^{177}$Au: The two-state mixing effect
/ Venhart, M (Bratislava, Inst. Phys.) ; Balogh, M (Bratislava, Inst. Phys.) ; Herzáň, A (Bratislava, Inst. Phys.) ; Wood, J L (Georgia Tech., Atlanta) ; Ali, F A (Liverpool U. ; Sulaimaniya U.) ; Joss, D T (Liverpool U.) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Auranen, K (Jyvaskyla U.) ; Carroll, R J (Liverpool U.) ; Drummond, M C (Liverpool U.) et al.
The extremely neutron-deficient isotopes $^{177,179}$Au were studied by means of in-beam γ -ray spectroscopy. Specific tagging techniques, α -decay tagging in $^{177}$Au and isomer tagging in $^{179}$Au, were used for these studies. [...]
2020 - 6 p.
- Published in : Phys. Lett. B 806 (2020) 135488
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Isomeric 13/2$^+$ state in $^{201}$Fr
/ Auranen, K (Jyvaskyla U.) ; Jakobsson, U (Jyvaskyla U.) ; Badran, H (Jyvaskyla U.) ; Grahn, T (Jyvaskyla U.) ; Greenlees, P T (Jyvaskyla U.) ; Herzáň, A (Jyvaskyla U. ; Bratislava, Inst. Phys.) ; Julin, R (Jyvaskyla U.) ; Juutinen, S (Jyvaskyla U.) ; Konki, J (Jyvaskyla U. ; CERN) ; Leino, M (Jyvaskyla U.) et al.
We have identified an isomeric state in $^{201}$Fr for which we propose a spin and parity of $13/2^+$, and interpret it as arising from the $\pi(i_{13/2})$ configuration. A half-life of 720(40) ns was measured, corresponding to $B(M2)=0.17(2)$ W.u., in good agreement with those of other $13/2^+ \to 9/2^- [\pi (i_{13/2}) \to \pi(h_{9/2})]$ transitions observed in other nuclei in the region. [...]
2020 - 5 p.
- Published in : Phys. Rev. C 101 (2020) 024306
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Signatures of enhanced octupole correlations at high spin in $^{136}\mathrm{Nd}$
/ Petrache, C M (CSNSM, Orsay) ; Minkov, N (Sofiya, Inst. Nucl. Res.) ; Nakatsukasa, T (Tsukuba U. ; Nishina Ctr., RIKEN) ; Lv, B F (CSNSM, Orsay ; Lanzhou, Inst. Modern Phys. ; Lanzhou U.) ; Astier, A (CSNSM, Orsay) ; Dupont, E (CSNSM, Orsay) ; Zheng, K K (CSNSM, Orsay) ; Greenlees, P (Jyvaskyla U.) ; Badran, H (Jyvaskyla U.) ; Calverley, T (Jyvaskyla U. ; Liverpool U.) et al.
Experimental signatures of moderately enhanced octupole correlations at high spin in $^{136}\mathrm{Nd}$ are indicated for the first time. The extracted dipole moments of two negative-parity bands are only two times smaller than those of the lanthanide nuclei with $N≈90$ which present well-established octupole correlations. [...]
2020 - 8 p.
- Published in : Phys. Rev. C 102 (2020) 014311
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Excited states in $^{217}$Ra populated in the α decay of $^{221}$Th
/ Parr, E (West Scotland U. ; SUPA, UK) ; Smith, J F (West Scotland U. ; SUPA, UK) ; Greenlees, P T (Jyvaskyla U.) ; Auranen, K (Jyvaskyla U.) ; Chapman, R (West Scotland U. ; SUPA, UK) ; Cullen, D M (Manchester U.) ; Grahn, T (Jyvaskyla U.) ; Grocutt, L (West Scotland U. ; SUPA, UK) ; Herzáň, A (Jyvaskyla U. ; Bratislava, Inst. Phys.) ; Herzberg, R D (Liverpool U.) et al.
Fine structure in the α decay of $^{221}_{90}$Th, populating excited states in $^{217}_{88}$Ra, was studied using αγ-coincidence spectroscopy. Two α-decay branches from $^{221}$Th have been newly observed, with $E_{\alpha} \mathrm{(keV)} [b_{\alpha}(\%)]=7951(8)[0.14(3)]$ and $8247(3)[1.51(12)]$, together with three previously known branches. [...]
2020 - 12 p.
- Published in : Phys. Rev. C 102 (2020) 054335
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High-spin states of $^{218}$Th
/ O'Donnell, D (SUPA, UK ; Liverpool U. ; IIT, Roorkee) ; Page, R D (Liverpool U.) ; Grahn, T (Jyvaskyla U.) ; Ali, F A (Liverpool U. ; Sulaimaniya U.) ; Auranen, K (Jyvaskyla U.) ; Capponi, L (SUPA, UK) ; Carroll, R J (Liverpool U.) ; Chishti, M M R (SUPA, UK) ; Drummond, M C (Liverpool U.) ; Greenlees, P T (Jyvaskyla U.) et al.
High-spin states in the $N = 128$ nucleus $^{218}$Th have been investigated following fusion–evaporation reactions, using the recoil-decay tagging technique. Due to the short-lived nature of the ground state of $^{218}$Th prompt $\gamma$ rays have been correlated with the $\alpha$ decay of the daughter nucleus $^{214}$Ra. [...]
2020 - 12 p.
- Published in : J. Phys. G 47 (2020) 095103
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Stability of the heaviest elements: $K$ isomer in $^{250}\mathrm{No}$
/ Kallunkathariyil, J (IRFU, Saclay) ; Sulignano, B (IRFU, Saclay) ; Greenlees, P T (Jyvaskyla U.) ; Khuyagbaatar, J (Darmstadt, GSI) ; Theisen, Ch (IRFU, Saclay) ; Auranen, K (Jyvaskyla U.) ; Badran, H (Jyvaskyla U.) ; Bisso, F (Jyvaskyla U.) ; Brionnet, P (Strasbourg, IPHC) ; Briselet, R (IRFU, Saclay) et al.
Decay spectroscopy of $^{250}\mathrm{No}$ has been performed using digital electronics and pulse-shape analysis of the fast nuclear decays for the first time. Previous studies of $^{250}\mathrm{No}$ reported two distinct fission decay lifetimes, related to the direct fission of the ground state and to the decay of an isomeric state but without the possibility to determine if the isomeric state decayed directly via fission or via internal electromagnetic transitions to the ground state. [...]
2020 - 6 p.
- Published in : Phys. Rev. C 101 (2020) 011301
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In-beam γ -ray and electron spectroscopy of $^{249,251}$Md
/ Briselet, R. (IRFU, Saclay) ; Theisen, Ch. (IRFU, Saclay) ; Sulignano, B. (IRFU, Saclay) ; Airiau, M. (IRFU, Saclay) ; Auranen, K. (Jyvaskyla U.) ; Cox, D.M. (Jyvaskyla U. ; Liverpool U.) ; Déchery, F. (IRFU, Saclay ; Strasbourg, IPHC) ; Drouart, A. (IRFU, Saclay) ; Favier, Z. (IRFU, Saclay) ; Gall, B. (Strasbourg, IPHC) et al.
The odd-$Z$ $^{251}$Md nucleus was studied using combined $\gamma$-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the $[521]1/2^-$ configuration, another rotational structure has been identified using $\gamma$-$\gamma$ coincidences. [...]
arXiv:2001.10235.-
2020-07-09 - 16 p.
- Published in : Phys. Rev. C 102 (2020) 014307
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Evidence against the wobbling nature of low-spin bands in $^{135}$Pr
/ Lv, B.F. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Petrache, C.M. (IJCLab, Orsay) ; Lawrie, E.A. (iThemba LABS ; Western Cape U.) ; Guo, S. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Astier, A. (IJCLab, Orsay) ; Dupont, E. (IJCLab, Orsay) ; Zheng, K.K. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS ; IJCLab, Orsay) ; Ong, H.J. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Wang, J.G. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhou, X.H. (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) et al.
The electromagnetic character of the $\Delta I=1$ transitions connecting the one- to zero-phonon and the two- to one-phonon wobbling bands should be dominated by an $E2$ component, due to the collective motion of the entire nuclear charge. In the present work it is shown, based on combined angular correlation and linear polarization measurements, that the mixing ratios of all analyzed connecting transitions between low-lying bands in $^{135}$Pr interpreted as zero-, one-, and two-phonon wobbling bands, have absolute values smaller than one. [...]
arXiv:2106.04879.-
2022-01-10 - 6 p.
- Published in : Phys. Lett. B 824 (2022) 136840
Fulltext: 1-s2.0-S0370269321007802-main - PDF; 2106.04879 - PDF;
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First observation of high-K isomeric states in $^{249}$Md and $^{251}$Md
/ Goigoux, T. (IRFU, Saclay) ; Theisen, Ch. (IRFU, Saclay) ; Sulignano, B. (IRFU, Saclay) ; Airiau, M. (IRFU, Saclay) ; Auranen, K. (Jyvaskyla U.) ; Badran, H. (Jyvaskyla U. ; STUK, Helsinki) ; Briselet, R. (IRFU, Saclay) ; Calverley, T. (Jyvaskyla U. ; Liverpool U.) ; Cox, D. (Jyvaskyla U. ; Liverpool U. ; Lund U.) ; Déchery, F. (IRFU, Saclay) et al.
Decay spectroscopy of the odd-proton nuclei $^{249}$Md and $^{251}$Md has been performed. High-$K$ isomeric states were identified for the first time in these two nuclei through the measurement of their electromagnetic decay. [...]
arXiv:2107.00517.-
2021-12-01 - 14 p.
- Published in : Eur. Phys. J. A 57 (2021) 321
Fulltext: PDF;
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