Systematische Untersuchung der Struktur exotischer gerade-gerade Atomkerne mittels schneller Zeitmessung der Lebensdauer angeregter Zustände.

• Applicant: Professor Dr. Jan Jolie
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2013 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 239902156

• Final Report Year: 2021

Final Report Abstract

Systematic investigation of the structural evolution in the shape transition regions of even-even nuclei from Er to Pt via fast timing lifetime measurements of excited nuclear states were done. They were performed using conversion electron-LaBr3(Ce) and Ge gated LaBr3(Ce)-LaBr3 (Ce) coincidences. Several lifetimes of low-lying states that had large uncertainties or were still unknown were obtained. They allowed the determination of absolute transition rates, mainly B(E2) values of low-spin yrast states. They were used for comparison with several theoretical models including theoretical studies applying the interacting boson model based on microscopic mean field methods.

Publications

• Evolution of the E2 transition strenght in deformed hafnium isotopes from new measurements in 172Hf, 174Hf and 176Hf, Phys. Rev C 91, 044301 (2015)
  M. Rudigier, K. Nomura, M. Dannhoff, R.-B. Gerst, J. Jolie, N. Saed-Samii, S. Stegemann, J.-M. Regis, L.M. Robledo, R. Rodriguez-Guzman, A. Blazhev, Ch. Fransen, N. Warr and K.O. Zell
  (See online at https://doi.org/10.1103/PhysRevC.91.044301)
• Evolution of collectivity near mid-shell from excited-state lifetime measurements in rare earth nuclei, Phys. Rev. C 93, 034323 (2016)
  V. Werner, N. Cooper, J.-M. Regis, M. Rudigier, E. Williams, J. Jolie, R. B. Cakirli, R.F. Casten, T. Ahn, V. Anagnostatou, Z. Berant, M. Bonett-Matiz, M. Elvers, A. Heinz, G. Ilie, D. Radeck, D. Savran and M.K. Smith
  (See online at https://doi.org/10.1103/PhysRevC.93.034323)
• Evolution of collectivity in the N=100 isotones near 170Yb, Phys. Rev C 95, 034316 (2017)
  V. Karayonchev, J.-M. Regis, J. Jolie, A. Blazhev, S. Ansari, R. Altenkirch, M. Dannhoff, F. Diel,A. Esmaylzadeh, Ch. Fransen, R.-B. Gerst, K. Moschner, C. Muller-Gatermann, N. Saed-Samii, S. Stegemann, N. Warr and K.O. Zell
  (See online at https://doi.org/10.1103/PhysRevC.95.034316)
• Lifetime determination in 190,192,194,196Hg via − fast-timing spectroscopy, Phys. Rev. C 98 (2018) 014313
  A. Esmaylzadeh, L. M. Gerhard, V. Karayonchev, J.-M. Régis, J. Jolie, M. Bast, A. Blazhev, T. Braunroth, M. Dannhoff, F. Dunkel, C. Fransen, G. Häfner, L. Knafla, M. Ley, C. Müller- Gatermann, K. Schomacker, N. Warr, and K.-O. Zell
  (See online at https://doi.org/10.1103/PhysRevC.98.014313)
• Low-lying electromagnetic transition strengths in 180Pt, Phys. Rev. C 97 (2018) 024336
  C. Müller-Gatermann, Dewald, A., Fransen, C., Braunroth, T., Jolie, J., Litzinger, J., Régis, J. M., von Spee, F., Warr, N., Zell, K. O., Grahn, T., Greenlees, P. T., Hauschild, K., Jakobsson, U., Julin, R., Juutinen, S., Ketelhut, S., Nieminen, P., Nyman, M., Peura, P., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sar\'en, J. Scholey, C., Sorri, J., Stolze, S., Uusitalo, J. and Petkov P.
  (See online at https://doi.org/10.1103/PhysRevC.97.024336)
• Evolution of E2 strength in the rare-earth isotopes 174,176,178,180Hf, Phys. Rev. C 99 (2019), 024316
  J. Wiederhold, V. Werner, R. Kern, N. Pietralla, D. Bucurescu, R. Carroll, N. Cooper, T. Daniel, D. Filipescu, N. Florea, R-B. Gerst, D. Ghita, L. Gurgi, J. Jolie, R. S. Ilieva, R. Lica, N. Marginean, R. Marginean, C. Mihai, I. O. Mitu, F. Naqvi, C. Nita, M. Rudigier, S. Stegemann, S. Pascu, and P. H. Regan
  (See online at https://doi.org/10.1103/PhysRevC.99.024316)
• Lifetime measurements of 162Er : Evolution of collectivity in the rare-earth region. Phys. Rev. C 102, (2020) 044310
  L. Knafla, G. Häfner, J. Jolie, J.-M. Régis, V. Karayonchev, A. Blazhev, A. Esmaylzadeh, C. Fransen, A. Goldkuhle, S. Herb, C. Müller-Gatermann, N. Warr, and K. O. Zell
  (See online at https://doi.org/10.1103/PhysRevC.102.044310)
• Lifetime measurements in 182Pt using γ-γ fast-timing, Eur. Phys. Journ. A 57 (2021) 174
  G. Haefner, A. Esmaylzadeh, J. Jolie, J.-M. Régis, C. Müller -Gatermann, A. Blazhev, C. Fransen, R.-B. Gerst, V. Karayonchev, L. Knafla, N. Saed-Samii, and K.-O. Zell
  (See online at https://doi.org/10.1140/epja/s10050-021-00492-x)