Gamma-ray Spectroscopy in the Vicinity of $^{108}$Zr

Abstract

The half-lives of 2 + 1 states were measured for 102,104 Zr and 106,108 Mo to test a new implementation of a LaBr 3 (Ce) array at the RIBF, RIKEN, Japan. The nuclei of interest were produced through the fission of a * Presented at the Zakopane Conference on Nuclear Physics "Extremes of the Nuclear Landscape", Zakopane, Poland, August 31-September 7, 2014.(721)722 F. Browne et al. 345MeV/nucleon 238 U beam and selected by the BigRIPS separator. Fission fragments were implanted into the WAS3ABi active stopper, surrounding which, 18 LaBr 3 (Ce) detectors provided fast γ-ray detection. Timing between the LaBr 3 (Ce) array and plastic scintillators allowed for the measurement of half-lives of low-lying states. The preliminary results, which agree with literature values, are presented along with experimental details.

Quantum Phase Transition in the Shape of Zr isotopes

“…2(d)). Figure 1(c) displays B(E2; 2 + 1 → 0 + 1 ) values, with small values up to N=58 and a sharp increase at N=60, consistent with experiment [13,[41][42][43][44]. The effective charges, (e p , e n ) = (1.3e, 0.6e), are used.…”

Shape evolution of neutron-rich Mo106,108,110 isotopes in the triaxial degree of freedom

“…Lifetime of the 2 + 1 states were measured using a fast timing array of 18 LaBr 3 (Ce) crystals, of which preliminary results are reported in Ref. [17]. Reliable branching ratios of the 2 + 2 states were determined.…”

Fast Timing Measurement Using an LaBr$_3$(Ce) Scintillator Detector Array Coupled with Gammasphere

“…Especially since γ-γ fast timing in the sub-nanosecond region has become feasible using LaBr 3 (Ce) scintillators, many studies in different mass regions have employed this method, more and more also in studies of very exotic nuclei using radioactive beams (e.g. β-γ timing at RIKEN [3]) or neutron induced fission sources (e.g. FATIMA at EXILL [4]).…”