Lifetime effects for high-resolution gamma-ray spectroscopy at relativistic energies and their implications for the RISING spectrometer

Doornenbal, P.; Reiter, P.; Grawe, H.; Saito, T.; Al-Khatib, A.; Banu, A.; Beck, T.; Becker, F.; Bednarczyk, P.; Bracco, A.; Bürger, A.; Cáceres, L.; Camera, F.; Chmel, S.; Crespi, F. C. L.; Geißel, H.; Gerl, J.; Górska, M.; ̧bosz, J. Gre; Hübel, H.; Kavatsyuk, M.; Kavatsyuk, O.; Kmiecik, M.; Kojouharov, I.; Kurz, N.; Lozeva, R.; Maj, A.; Mandal, S.; Męczyński, W.; Million, B.; Podolyák, Zs.; Richard, A.; Saito, N.; Schaffner, H.; Seidlitz, M.; Striepling, T.; Walker, Joel W.; Warr, N.; Weick, H.; Wieland, O.; Winkler, M.; Wollersheim, H. J.

doi:10.1016/j.nima.2009.11.017

Cited by 30 publications

(46 citation statements)

References 12 publications

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“…The relation between the mean lifetime and the energy shift was determined using Monte Carlo (MC) simulations following a similar methodology as the one described in Refs. [27,42]. Because the reaction cross sections at the secondary target are independent of the beam energy [43], we assumed an excitation at the center of the target.…”

Section: Lifetime Determinationmentioning

confidence: 99%

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

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Background: In the neutron-rich A ≈ 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method:The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the γ ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a γ -ray transition with a known energy. This relativistic Doppler-shiftattenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: τ = 29.7 Conclusions:The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A = 100 to A = 108 with a maximum reached at N = 64. The transition probabilities decrease for 108 Mo which may be related to its well-pronounced triaxial shape indicated by the calculations.

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Section: Lifetime Determinationmentioning

confidence: 99%

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

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“…[51] for in-beam g-ray experiments at relativistic energies using the RISING array. A similar study for AGATA is presented in this section.…”

Section: Interplay Between Target Thickness and Half-life Of The Nuclmentioning

confidence: 99%

“…The event generator is the one described in Ref. [51] with only minor updates to interface with the standard AGATA-code [14]. A transition energy of E g,J ¼ 1 MeV is assumed in all cases.…”

Section: Interplay Between Target Thickness and Half-life Of The Nuclmentioning

confidence: 99%

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Conceptual design and performance study for the first implementation of AGATA at the in-flight RIB facility of GSI

Domingo‐Pardo

Bazzacco

Doornenbal

et al. 2012

Nuclear Instruments and Methods in Physics Research Section A:

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“…Lifetime effects: Lifetime effects on the energy spectrum [13,14] may complicate the peak separation and reduce the peak-tobackground ratio because they can lead to a significant broadening of the observed peaks at angles not in the proximity to θ det ¼ arccosðβÞ. These lifetime effects are included in the simulated spectra shown in Figs.…”

Section: Methodsmentioning

confidence: 99%