International Workshop SDANCA 2015

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Presentation transcript:

International Workshop SDANCA 2015 Current experimental techniques of lifetime measurements and their importance for the nuclear structure S. Pascu International Workshop SDANCA 2015 8-10 October 2015

Outline: Introduction The new ROSPHERE array in Bucharest; Lifetime measurements in a deformed nucleus: 168Yb; Quadrupole and octupole collectivity in a vibrational nucleus: 150Gd; Conclusions

1. Introduction C. Ur, private communication

2. The new ROSPHERE array in Bucharest 25 positions; Usually in a mixed configuration: 14 HPGe and 11 LaBr3; Fast-timing measurements; Plunger measurements; New campaign of experiments (PAC meeting).

2. The new ROSPHERE array in Bucharest

2. The new ROSPHERE array in Bucharest – characteristics

3. Fast-timing method N. Marginean et al., EPJA 46, 329 (2010)

4. Lifetime measurements in 168Yb 166Er(α,2nγ)168Yb Eα = 24 MeV d = 2 mg/cm2 8 HPGe and 11 LaBr3 S. Pascu et al., PRC 91, 034321 (2015)

Data analysis Coincidence 299-199 168Yb

Results of the experiment S. Pascu et al., PRC 91, 034321 (2015) Very short lifetime for the fast-timing method

Comparison with the neighboring isotopes 2+ 4+ 6+

5. Recoil distance Doppler shift method θ Target E0 Energy d Nr Stopper Es DDCM

Plunger device

6. Quadrupole and octupole collectivity in Gd nuclei Octupole vibration l=2 l=3 Quadrupole vibration

6. Quadrupole and octupole collectivity in Gd nuclei ROSPHERE + Plunger 140Ce (13C, 3nγ)150Gd E(13C) = 62 MeV 0.5 mg/cm2 140Ce target 5 pnA 13C beam 1% efficiency of HPGe detectors 11 distances between 20 and 500 μm

Experimental results

Experimental results

Experimental results

Experimental results

Experimental results

Experimental results

Experimental results R. H. Spear and W. N. Catford, PRC 41, R1351 (1990)

5. Conclusions The new ROSPHERE array in Bucharest; Allows for lifetime measurements; Fast-timing method: Lifetime measurements 168Yb; Recoil distance Doppler shift method: quadrupole and octupole collectivity in Gd nuclei using the plunger method.