The jurogam 3 spectrometer

Pakarinen, J.; Ojala, J.; Ruotsalainen, P.; Tann, H.; Badran, H.; Calverley, T.; Hilton, J.; Grahn, T.; Greenlees, P. T.; Hytönen, Mirjami; Illana, A.; Kauppinen, A.; Luoma, Minna‐Liisa; Papadakis, P.; Partanen, J.; Porras, K.; Puskala, M.; Rahkila, P.; Ranttila, K.; Sarén, J.; Sandzelius, M.; Szwec, Stuart; Tuunanen, Juha; Uusitalo, J.; Zimba, G.

doi:10.1140/epja/s10050-020-00144-6

“…The present work is devoted to the study of 119 Ba, in which two bands based on opposite-parity orbitals are known [4]. The experimental data were obtained from a high-statistics experiment performed with the γ -detector array JUROGAM 3 [6] coupled with the recoil mass separator MARA [7] employing the 58 Ni( 64 Zn, 2pn) 119 Ba reaction at a beam energy of 255 MeV. Several results on the structure of 119 Cs obtained from the same experiment have been recently published or submitted for publication [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Neutron excitations in Ba119

Zheng¹,

Petrache²,

Zhang³

et al. 2021

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The neutron-deficient 119 Ba nucleus has been studied using the 58 Ni( 64 Zn, 2pn) reaction and the JUROGAM 3 γ -ray detector array coupled to the MARA recoil-mass separator setup. One new rotational band and several low-lying states are newly identified. A half-life of T 1/2 = 0.36(2) μs has been measured for the 5/2 − bandhead of the νh 11/2 band. The two previously known rotational bands are confirmed, except for the higher part of the +1/2 signature partner of the positive-parity band. Configurations are assigned based on the analysis of the observed quasiparticle alignments whose nature is unveiled by the calculations using the particle number conserving cranked shell model.

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“…The need for γ -ray detection also reduces the available data. The JUROGAM 3 spectrometer has an absolute efficiency of 5.2% at 1.3 MeV [15]. Using this efficiency, the available statistics in an experiment are reduced by a factor of ∼ 20 when one requires a γ -ray-recoil condition.…”

Section: Discussionmentioning

confidence: 99%

“…Prompt γ rays were detected with the JUROGAM 3 spectrometer [15], an array of 39 Compton-suppressed HPGe detectors, on loan from GAMMAPOOL. The total data readout (TDR) [23] data acquisition system was employed to record the events from all detectors and the GRAIN [24] software package was used to perform offline analysis.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Nuclei of interest are then identified either by employing the recoil-decay tagging technique, i.e. using coincidences between the recoil implanted in the DSSSD and the subsequent particle decay [14], or by using γ -ray-recoil coincidences between the prompt γ rays detected at the target position using the JUROGAM 3 spectrometer [15] and the recoils detected in the MWPC and DSSSD.…”

Section: Introductionmentioning

confidence: 99%

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Lifetime measurements of yrast states in $$^{\mathbf {178}}$$Pt using the charge plunger method with a recoil separator

Heery

¹

,

Barber

²

,

Vilhena

³

et al. 2021

Eur. Phys. J. A

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Lifetime measurements in $$^{178}$$ 178 Pt with excited states de-exciting through $$\gamma $$ γ -ray transitions and internal electron conversions have been performed. Ionic charges were selected by the in-flight mass separator MARA and measured at the focal plane in coincidence with the $$4_1^+\rightarrow 2_1^+$$ 4 1 + → 2 1 + $$257\,$$ 257 keV $$\gamma $$ γ -ray transition detected using the JUROGAM 3 spectrometer. The resulting charge-state distributions were analysed using the differential decay curve method (DDCM) framework to obtain a lifetime value of 430(20) ps for the $$2_1^+$$ 2 1 + state. This work builds on a method that combines the charge plunger technique with the DDCM analysis. As an alternative analysis, ions were selected in coincidence with the $$^{178}$$ 178 Pt alpha decay ($$E_{\mathrm {alpha}} = 5.458(5)$$ E alpha = 5.458 ( 5 ) MeV) at the focal plane. Lifetime information was obtained by fitting a two-state Bateman equation to the decay curve with the lifetime of individual states defined by a single quadrupole moment. This yielded a lifetime value of 430(50) ps for the $$2_1^+$$ 2 1 + state, and 54(6) ps for the $$4_1^+$$ 4 1 + state. An analysis method based around the Bateman equation will become especially important when using the charge plunger method for the cases where utilising coincidences between prompt $$\gamma $$ γ rays and recoils is not feasible.

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“…The 119 Cs nucleus has been investigated using the 58 Ni( 64 Zn, 3p) fusion-evaporation reaction with a beam energy of 255 MeV, and the JUROGAM 3 [18] plus MARA [19] setup at the Accelerator Laboratory of the University of Jyväskylä, Finland. A self-supporting enriched 58 Ni foil of 0.75 mg/cm 2 thickness was bombarded with a 64 Zn beam delivered by the K130 cyclotron.…”

Section: A Experimental Detailsmentioning

confidence: 99%

Complete set of proton excitations in Cs119

Zheng¹,

Petrache²,

Zhang³

et al. 2021

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The very neutron-deficient strongly deformed 119 Cs nucleus has been studied using the 58 Ni( 64 Zn, 3p) reaction and the JUROGAM 3 γ -ray detector array coupled to the MARA recoil-mass separator setup. The excitation energies of all observed bands have been determined, spins and parities have been firmly assigned to most of the observed states. The previously known and the newly identified rotational bands have been extended to very high spin and excitation energy. The configurations of the observed bands are discussed using the particle number conserving cranked shell model. The present study establishes the largest set of rotational bands observed in the proton-rich A ≈ 120 mass region.

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The jurogam 3 spectrometer

Cited by 30 publications

References 22 publications

Neutron excitations in Ba119

Neutron excitations in Ba119

Lifetime measurements of yrast states in $$^{\mathbf {178}}$$Pt using the charge plunger method with a recoil separator

Complete set of proton excitations in Cs119

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