Identification of a nanosecond isomer of ¹⁶⁴Tb

@article{bormans2026identification,
  title = {{Identification of a nanosecond isomer of $^164$Tb}},
  author = {J.P Bormans and J.E.L Larsson and H.M Albers and M Górska and M Polettini and D Brugnara and N Pietralla and Zs Podolyák and P.H Regan and B Bles and C Chatel and B Das and T Davinson and T Dickel and E Haettner and P Herrmann and N.J Hubbard and C.E Jones and H Schaffner and G Aggez and U Ahmed and M Al-Aqeel and B Alayed and A Algora and S Alhomaidhi and N Alwadie and B Amorim and M Armstrong and M Bajzek and J Bardak and G Bartram and G Benzoni and D Bittner and Z Chen and D Das and F Drent and L.M Fraile and E.M Gandolfo and G.García de Lorenzo and J Gellanki and J Gerl and T Grahn and C Hornung and H Huang and K.E Ide and A Jedele and D Judson and A Jungclaus and I Kojouharov and P Khandelwal and A Košir and G Košir and D Kostyleva and G Kumar and M Kundu and M Labiche and G Li and Z Liu and R Lozeva and H Mayr},
  journal = {Eur.Phys.J.A},
  year = {2026},
  month = sep,
  doi = {10.1140/epja/s10050-026-01950-0},
  url = {https://hal.science/hal-05742437v1},
  note = {CC BY},
}

TY  - JOUR
TI  - Identification of a nanosecond isomer of ^164Tb
AU  - J.P Bormans
AU  - J.E.L Larsson
AU  - H.M Albers
AU  - M Górska
AU  - M Polettini
AU  - D Brugnara
AU  - N Pietralla
AU  - Zs Podolyák
AU  - P.H Regan
AU  - B Bles
AU  - C Chatel
AU  - B Das
AU  - T Davinson
AU  - T Dickel
AU  - E Haettner
AU  - P Herrmann
AU  - N.J Hubbard
AU  - C.E Jones
AU  - H Schaffner
AU  - G Aggez
AU  - U Ahmed
AU  - M Al-Aqeel
AU  - B Alayed
AU  - A Algora
AU  - S Alhomaidhi
AU  - N Alwadie
AU  - B Amorim
AU  - M Armstrong
AU  - M Bajzek
AU  - J Bardak
AU  - G Bartram
AU  - G Benzoni
AU  - D Bittner
AU  - Z Chen
AU  - D Das
AU  - F Drent
AU  - L.M Fraile
AU  - E.M Gandolfo
AU  - G.García de Lorenzo
AU  - J Gellanki
AU  - J Gerl
AU  - T Grahn
AU  - C Hornung
AU  - H Huang
AU  - K.E Ide
AU  - A Jedele
AU  - D Judson
AU  - A Jungclaus
AU  - I Kojouharov
AU  - P Khandelwal
AU  - A Košir
AU  - G Košir
AU  - D Kostyleva
AU  - G Kumar
AU  - M Kundu
AU  - M Labiche
AU  - G Li
AU  - Z Liu
AU  - R Lozeva
AU  - H Mayr
PY  - 2026
DA  - 2026/09/08
JO  - Eur.Phys.J.A
DO  - 10.1140/epja/s10050-026-01950-0
UR  - https://hal.science/hal-05742437v1
AB  - This letter reports on the identification of a new isomeric state of ^164 164 Tb ( Z=65 Z = 65 , N=99 N = 99 ), which was measured with the DESPEC setup at the GSI Helmholtzzentrum für Schwerionenforschung GmbH following the first relativistic fragmentation of an ^170 170 Er primary beam. From the time distribution and coincidences of the emitted γ γ rays, the isomer is tentatively assigned to a state with spin-parity (7^−) ( 7 - ) at an excitation energy of 283.3(2) keV 283.3 ( 2 ) keV with a half-life of 159(11) ns 159 ( 11 ) ns . The isomer is interpreted as the π 7/2^−[523]⊗ ν 7/2^+[633] π 7 / 2 - [ 523 ] ⊗ ν 7 / 2 + [ 633 ] configuration from the Nilsson orbital systematics. These results represent the first report of γ γ -ray spectroscopy of ^164 164 Tb, providing insight into the ground-state and low-lying level structure.
ER  -