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Spectroscopy of $^{187}$Tl: shape coexistence
/ Guo, C Y (Peking U., SKLNPT) ; Zhang, W Q (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Huang, H (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhang, S Q (Peking U., SKLNPT) ; Li, Z H (Peking U., SKLNPT) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Hua, H (Peking U., SKLNPT) ; Luo, D W (Peking U., SKLNPT) ; Wu, H Y (Peking U., SKLNPT ; Beijing, Inst. Atomic Energy) ; Andreyev, A N (York U., England ; Jefferson Lab ; JAEA, Ibaraki) et al.
The prompt and delayed $\gamma $-ray spectra of $^{187}$Tl was studied via the $^{142}$Nd($^{50}$Cr, 3p2n)$^{187}$Tl fusion-evaporation reaction at a beam energy of 255 MeV. An enhanced level scheme of $^{187}$Tl was established. [...]
2024 - 10 p.
- Published in : Eur. Phys. J. A 60 (2024) 165
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Half-life determination of $^{215}$At and $^{221}$Ra with high-purity radioactive ion beams
/ Bara, S (KU Leuven, Dept. Phys. Astron.) ; Jajčišinová, E (KU Leuven, Dept. Phys. Astron. ; Geel, JRC) ; Cocolios, T E (KU Leuven, Dept. Phys. Astron.) ; Andel, B (Comenius U.) ; Antalic, S (Comenius U.) ; Camaiani, A (Florence U. ; INFN, Florence ; KU Leuven, Dept. Phys. Astron.) ; Costache, C (Bucharest, IFIN-HH) ; Dockx, K (KU Leuven, Dept. Phys. Astron.) ; Farooq-Smith, G J (Edinburgh U. ; KU Leuven, Dept. Phys. Astron.) ; Kellerbauer, A (Geel, JRC) et al.
At CERN-ISOLDE, high-purity radioactive ion beams of $^{219}$Fr and $^{221}$RaF were investigated with $\alpha$-decay spectroscopy at the CRIS and ASET experiments in the course of three different experimental campaigns. The half-life of $^{215}$At, $\alpha$-decay daughter of $^{219}$Fr, is measured to be 36.3(3)[9]μs, and that of $^{221}$Ra was determined to be 26.2(1)[6]s, both of which are well in line with the trends in this region of the nuclear landscape but at odds with some of the reported literature..
2024 - 8 p.
- Published in : Appl. Radiat. Isot. 208 (2024) 111289
Fulltext: Preprint - PDF; Supplementary material - PDF;
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Deformation versus Sphericity in the Ground States of the Lightest Gold Isotopes
/ Cubiss, J G (York U., England) ; Andreyev, A N (York U., England ; JAEA, Ibaraki) ; Barzakh, A E (Unlisted) ; Van Duppen, P (KU Leuven, Dept. Phys. Astron.) ; Hilaire, S (CEA DAM) ; Péru, S (CEA DAM) ; Goriely, S (Brussels U., IAA) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U. ; Ain Shames U.) ; Andel, B (Comenius U.) et al.
The changes in mean-squared charge radii of neutron-deficient gold nuclei have been determined using the in-source, resonance-ionization laser spectroscopy technique, at the ISOLDE facility (CERN). From these new data, nuclear deformations are inferred, revealing a competition between deformed and spherical configurations. [...]
2023 - 8 p.
- Published in : Phys. Rev. Lett. 131 (2023) 202501
Fulltext: PDF;
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First observation of the decay of the 13/24$^+$ isomer in $^{183}$Hg and B(M2) systematics of neutron transitions across the nuclear chart
/ Huang, H (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Zhang, W Q (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Andreyev, A N (York U., England, Dept. Math. ; JAEA, Ibaraki) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Seweryniak, D (Argonne, PHY) ; Li, Z H (Peking U., SKLNPT) ; Guo, C Y (Peking U., SKLNPT) ; Barzakh, A E (St. Petersburg, INP) ; Van Duppen, P (KU Leuven, Dept. Phys. Astron.) ; Andel, B (Comenius U.) et al.
The decay of the 13/2$^+$ isomeric state in $^{183}$Hg was observed for the first time following the $\alpha$ decay of the 13/2$^+$ isomer in $^{187}$Pb produced in the $^{142}$Nd($^{50}$Cr, 2p3n) reaction. Using $\alpha - \gamma$ delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) μs. [...]
2022 - 8 p.
- Published in : Phys. Lett. B 833 (2022) 137345
Fulltext: PDF;
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First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic $^{187}$Pb
/ Zhang, W Q (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Liu, Z (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Seweryniak, D (Argonne, PHY) ; Huang, H (Lanzhou, Inst. Modern Phys. ; CAS, Beijing) ; Li, Z H (Peking U., SKLNPT) ; Li, J G (Lanzhou, Inst. Modern Phys. ; Peking U., SKLNPT) ; Guo, C Y (Peking U., SKLNPT) ; Doherty, D T (Surrey U.) ; Barzakh, A E (St. Petersburg, INP) et al.
Prompt and delayed γ-ray spectroscopy of the neutron-deficient, semi-magic isotope 187Pb has been performed using the recoil-decay and isomer-decay tagging techniques at the Argonne Gas-Filled Analyzer. A new 5.15(15)-μs isomeric state at only 308 keV above the spherical 3/2− ground state is identified and classified as a shape isomer. [...]
2022 - 7 p.
- Published in : Phys. Lett. B 829 (2022) 137129
Publication: PDF;
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Producing gold at ISOLDE-CERN
/ Barzakh, A E (St. Petersburg, INP) ; Andreyev, A N (York U., England ; JAERI, Tokai) ; Atanasov, D (Heidelberg, Max Planck Inst.) ; Cubiss, J G (York U., England) ; Harding, R D (York U., England ; CERN) ; Al Monthery, M (York U., England) ; Althubiti, N A (Manchester U. ; Al Jouf U.) ; Andel, B (Comenius U. ; Leuven U.) ; Antalic, S (Comenius U.) ; Ballof, J (CERN ; Mainz U., Inst. Kernchem.) et al.
The yield of 18 ion beams of radioactive gold nuclei produced in the thick uranium target at ISOLDE (CERN) by 1.4-GeV protons was measured. The production-efficiency dependence on the half-life (efficiency curve) was derived using the in-target production calculations by the FLUKA-CERN code. [...]
2022 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 513 (2022) 26-32
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Large Shape Staggering in Neutron-Deficient Bi Isotopes
/ Barzakh, A (St. Petersburg, INP) ; Andreyev, A N (JAEA, Ibaraki ; York U., England) ; Raison, C (York U., England) ; Cubiss, J G (York U., England) ; Van Duppen, P (Leuven U.) ; Péru, S (CEA DAM) ; Hilaire, S (CEA DAM) ; Goriely, S (Brussels U., IAA) ; Andel, B (Comenius U.) ; Antalic, S (Comenius U.) et al.
The changes in the mean-square charge radius (relative to $^{209}$Bi), magnetic dipole, and electric quadrupole moments of $^{187,188,189,191}$Bi were measured using the in-source resonance-ionization spectroscopy technique at ISOLDE (CERN). A large staggering in radii was found in $^{187,188,189}$Big, manifested by a sharp radius increase for the ground state of $^{188}$Bi relative to the neighboring $^{187,189}$Big. [...]
2021 - 7 p.
- Published in : Phys. Rev. Lett. 127 (2021) 192501
Fulltext: PDF;
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