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FACULTY OF PHYSICS

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2024-11-23 18:19

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Conference: Bucharest University Faculty of Physics 2014 Meeting

Section: Nuclear and Elementary Particles Physics

Title:

RDDS lifetime measurements using the ROSPHERE spectrometer: The case of 119Te - (2)

Authors:

Cristian COSTACHE(1,2), C. MIHAI(1), I.O. MITU(1,3), Dorel BUCURESCU(1), Gheorghe CĂTA-DANIL(1,3), Irina CĂTA-DANIL(1), Daniela DELEANU(1,3), Dan FILIPESCU(1), N. FLOREA(1,3), Ioana GHEORGHE(1,2), Dan G. GHIŢĂ(1), T. GLODARIU(1), Răzvan LICĂ(1,2), Nicolae MĂRGINEAN(1), Raluca MĂRGINEAN(1), Alexandru NEGREŢ(1) , C.R. NIŢĂ(1,3), S. PASCU(1), Tiberiu SAVA(1), Octavian SIMA(2), Lucian STROIE(1), Gabriel SULIMAN(1), Rares SUVĂILĂ(1), S. TOMA(1,3), Nicolae Victor ZAMFIR(1)

Affiliation:

(1) Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, RO-077125 Bucharest, Romania

(2) Faculty of Physics, University of Bucharest, Bucharest, Romania

(3) Physics Department, University “Politehnica” of Bucharest, Bucharest, Romania

E-mail

cristian.costache@nipne.ro

Keywords:

gamma-ray spectrometry, lifetime measurements, RDDS, ROSPHERE

Abstract:

The ROmanian array for SPectroscopy in HEavy ion REactions (ROSPHERE) is a 4π gamma-ray spectrometer build in a symmetric configuration that includes 25 detectors. They are divided into 5 angular rings that are placed at 37, 70, 90, 110 and 143 degrees with respect to the beam axis, each ring with 5 available positions for detectors. This array is dedicated to lifetime measurements employing the Recoil Distance Doppler-Shift (RDDS) and Fast Electronic Scintillation Timing (FEST) methods. The RDDS method requires a special reaction chamber fitted with the Plunger device, designed at the University of Koln, which is used to maintain a distance of flight between the target and stopper in the micrometer range. The commissioning of the ROSPHERE spectrometer was done using both the RDDS and the in-beam FEST methods. One of the first experiments used a 13C beam on an 110Pd target which populated the 120Te and 119Te nuclei through fusion-evaporation reactions. We are reporting lifetimes for the 119Te nucleus that were measured with the RDDS method and extracted from the experimental data using the Differential Decay Curve Method (DDCM).