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)
  Rudigier, M.; Nomura, K.; Dannhoff, M.; Gerst, R-B.; Jolie, J.; Saed-Samii, N.; Stegemann, S.; Régis, J-M.; Robledo, L. M.; Rodríguez-Guzmán, R.; Blazhev, A.; Fransen, Ch.; Warr, N. & Zell, K. O.
  
• Evolution of collectivity near mid-shell from excited-state lifetime measurements in rare earth nuclei, Phys. Rev. C 93, 034323 (2016)
  Werner, V.; Cooper, N.; Régis, J.-M.; Rudigier, M.; Williams, E.; Jolie, J.; Cakirli, R. B.; Casten, R. F.; Ahn, T.; Anagnostatou, V.; Berant, Z.; Bonett-Matiz, M.; Elvers, M.; Heinz, A.; Ilie, G.; Radeck, D.; Savran, D. & Smith, M. K.
  
• Evolution of collectivity in the N=100 isotones near 170Yb, Phys. Rev C 95, 034316 (2017)
  Karayonchev, V.; Régis, J.-M.; Jolie, J.; Blazhev, A.; Altenkirch, R.; Ansari, S.; Dannhoff, M.; Diel, F.; Esmaylzadeh, A.; Fransen, C.; Gerst, R.-B.; Moschner, K.; Müller-Gatermann, C.; Saed-Samii, N.; Stegemann, S.; Warr, N. & Zell, K. O.
  
• Lifetime determination in 190,192,194,196Hg via − fast-timing spectroscopy, Phys. Rev. C 98 (2018) 014313
  Esmaylzadeh, A.; Gerhard, L. M.; Karayonchev, V.; Régis, J.-M.; Jolie, J.; Bast, M.; Blazhev, A.; Braunroth, T.; Dannhoff, M.; Dunkel, F.; Fransen, C.; Häfner, G.; Knafla, L.; Ley, M.; Müller-Gatermann, C.; Schomacker, K.; Warr, N. & Zell, K.-O.
  
• Low-lying electromagnetic transition strengths in 180Pt, Phys. Rev. C 97 (2018) 024336
  Müller-Gatermann, C.; 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.; ... & Petkov, P.
  
• Evolution of E2 strength in the rare-earth isotopes 174,176,178,180Hf, Phys. Rev. C 99 (2019), 024316
  Wiederhold, J.; Werner, V.; Kern, R.; Pietralla, N.; Bucurescu, D.; Carroll, R.; Cooper, N.; Daniel, T.; Filipescu, D.; Florea, N.; Gerst, R-B.; Ghita, D.; Gurgi, L.; Jolie, J.; Ilieva, R. S.; Lica, R.; Marginean, N.; Marginean, R.; Mihai, C.; ... & Regan, P. H.
  
• Lifetime measurements of 162Er : Evolution of collectivity in the rare-earth region. Phys. Rev. C 102, (2020) 044310
  Knafla, L.; Häfner, G.; Jolie, J.; Régis, J.-M.; Karayonchev, V.; Blazhev, A.; Esmaylzadeh, A.; Fransen, C.; Goldkuhle, A.; Herb, S.; Müller-Gatermann, C.; Warr, N. & Zell, K. O.
  
• Lifetime measurements in 182Pt using γ-γ fast-timing, Eur. Phys. Journ. A 57 (2021) 174
  Häfner, G.; Esmaylzadeh, A.; Jolie, J.; Régis, J.-M.; Müller-Gatermann, C.; Blazhev, A.; Fransen, C.; Gerst, R.-B.; Karayonchev, V.; Knafla, L.; Saed-Samii, N. & Zell, K.-O.