Lifetime measurements with JUROGAM
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1 Lifetime measurements with JUROGAM Tuomas Grahn, University of Liverpool EGP workshop Paris, France
2 OUTLINE Facility for RDT studies at JYFL RDDS measurements with JUROGAM + RITU The first RDDS lifetime measurements utilising the RDT method 180,182 Hg experiment complementary Coulomb excitation studies at REX-ISOLDE 195,196 Po experiment probing the collectivity as a function of N New results from the latest 167,168 Os lifetime measurements (autumn 2007) Outlook
3 RDT Instrumentation at JYFL GREAT Focal plane spectrometer RITU Gas-filled recoil separator, transmission % JUROGAM 43 Ge+BGO detectors, eff. 4% TDR Total Data Readout, triggerless data acquisition system with 10 ns time stamping
4 RDDS lifetime measurements at the JYFL First ever recoil distance Doppler-shift (RDDS) lifetime measurements utilising a gas-filled recoil separator and the recoil decay tagging (RDT) technique a special plunger device with a degrader foil designed by the University of Köln.
5 RDDS lifetime measurements at JYFL Difficulties Use of the degrader foil: JUROGAM Ge-detector counting rate increases. With a 1 mg/cm 2 Mg foil, RITU transmission efficiency cut by a factor of 2/3. Doppler-shift difference rather low: v/c = 4% v/c =3%. Suitable θ: Only 15 of JUROGAM Ge-detectors can be used; 5 at 158 and 10 at 134. Ge efficiency reduced significantly.
6 BACKGROUND AND MOTIVATION In the light Pb region, close to the neutron mid-shell at N = 104, quadrupole collectivity and shape coexistence have been extensively studied experimentally and theoretically. However, the knowledge of transition probabilities is usually missing. Those would be an absolute measure of collectivity and could shed light on configuration mixing. Couple the Köln plunger device to JUROGAM + RITU at the University of Jyväskylä (JYFL). 186 Pb & 194 Po: First RDDS lifetime measurements employing the RDT technique. Improved lifetime information on 188 Pb using the recoilgating method (PRL 97, (2006) & NPA 801, 83 (2008)). Proved that RDDS lifetime measurements are possible for such exotic species. Ongoing programme to study lifetimes in nuclei far from stability.
7 Shape coexistence near Z = 82 An example: Intruder states in neutron-deficient Pb nuclei prolate π(4p - 4h) oblate π(2p - 2h) Spherical π(0p - 0h)
8 Shape coexistence near Z = 82 Kinematic moments of inertia prolate oblate
9 186,188 Pb and 194 Po Collectivity and Configuration Mixing Verified the collectivity and deformation of prolate and oblate yrast bands in the neutron-deficient Pb region. In addition, addressed the question of configuration mixing of the coexisting prolate and oblate shapes.
10 186,188 Pb and 194 Po Collectivity and Configuration Mixing Verified the collectivity and deformation of prolate and oblate yrast bands in the neutron-deficient Pb region. In addition, addressed the question of configuration mixing of the coexisting prolate and oblate shapes. Results could indicate the increase of collectivity with increasing proton number more data needed!
11 Lifetimes in 180,182 Hg 94(96) Mo( 88 Sr,2n) 180(182) 378(371) MeV RDDS lifetime measurements of yrast states in 180,182 Hg, data analysis completed (T. Grahn, A. Petts, University of Liverpool) Will provide systematically data of the collective behaviour and shape coexistence Complementary measurements: Coulomb excitation studies of 180,182,184,186,188 Hg at REX- ISOLDE (presentation by N. Bree on Friday) Recoil gated γ γprojection of 182 Hg recorded with five Ge detectors at 158.
12 Lifetimes in 180,182 Hg 94(96) Mo( 88 Sr,2n) 180(182) 378(371) MeV RDDS lifetime measurements of yrast states in 180,182 Hg, data analysis completed (T. Grahn, A. Petts, University of Liverpool) Will provide systematically data of the collective behaviour and shape coexistence Complementary measurements: Coulomb excitation studies of 180,182,184,186,188 Hg at REX- ISOLDE (presentation by N. Bree on Friday) RDT singles γ-ray spectra of 180 Hg recorded with five Ge detectors at 158.
13 Lifetimes in 195,196 Po 113 Cd( 86 Kr,3n(4n)) 196(195) 382 MeV Aim to establish the level of collectivity of near spherical states in neutron deficient Po nuclei Vibrational or rotational? What is the level of collectivity of low-lying states? Mixing of oblate and near spherical states? [PRC 52 (1995) 52] RDT singles γ-ray spectra of 196 Po recorded with five Ge detectors at 158.
14 Lifetimes in 195,196 Po 113 Cd( 86 Kr,3n(4n)) 196(195) 382 MeV Lifetimes of the 2 +, 4 + and 6 + yrast states extracted. The B(E2) values could present those for a vibrational nucleus. Lifetime determination of the 2 + state in 196 Po. The decay curve is recorded with five Ge detectors at 158.
15 Lifetimes in 195,196 Po 113 Cd( 86 Kr,3n(4n)) 196(195) 382 MeV 195 Po was produced rather strongly. Lifetime of the 17/2 + state extracted. Lifetime determination of the 13/2 + state in 195 Po. The decay curve is recorded with five Ge detectors at 158.
16 Lifetime measurements of 167,168 Os 92 Mo( 78 Kr,2p(2pn)) 168(167) 336 MeV 168 Os has E(4+)/E(2+) = 2.51 very close to the value of a gamma-soft rotor. The E(4+)/E(2+) ratio of the light Os isotopes evolves from deformed rotors towards the vibrational limit, when the N=82 shell gap is approached. No quantitative measurements of deformation and B(E2) values (yet).
17 Lifetime measurements of 167,168 Os 92 Mo( 78 Kr,2p(2pn)) 168(167) 336 MeV RDT singles γ-ray spectra of 166 Os recorded with five Ge detectors at 158.
18 Lifetime measurements of 167,168 Os 92 Mo( 78 Kr,2p(2pn)) 168(167) 336 MeV τ (17/2 + ) = 20(4) ps Level scheme by D. O Donnell RDT singles γ-ray spectra of 167 Os recorded with five Ge detectors at 158.
19 FUTURE PROSPECTS RDDS measurements in the light Pb region are strongly connected to the Coulomb excitation measurements carried out at REX-ISOLDE. Level lifetimes needed in Coulex analysis in order to extract the sign of quadrupole moment. Approved RDDS measurements at JYFL: 109 I - The first proton tagged RDDS measurement. 175 Au - Shape coexistence beyond the neutron midshell. JUROGAM II: more Ge efficiency at θ 90 more γγ measurements could be possible. New techniques: Isomer tagged RDDS measurements ( 144 Ho Presentation by P. Mason). RDDS measurements using Coulomb excitation ( 128,130 Xe IKP Köln).
2, 8, 20, 28, 50, 82, 126.
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