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- Title
SHORT-RANGE LIFETIME MEASUREMENTS FOR DEEP-INELASTIC REACTION PRODUCTS: THE <sup>19</sup>O TEST CASE.
- Authors
CIEMAŁA, M.; ZILIANI, S.; CRESPI, F.; LEONI, S.; FORNAL, B.; MAJ, A.; BEDNARCZYK, P.; BENZONI, G.; BRACCO, A.; BOIANO, C.; BOTTONI, S.; BRAMBILLA, S.; BAST, M.; BECKERS, M.; BRAUNROTH, T.; CAMERA, F.; CIEPLICKA-ORYŃCZAK, N.; CLÉMENT, E.; DORVAUX, O.; ERTURK, S.
- Abstract
An experiment, aiming at measuring lifetimes of excited states in neutron-rich C and O isotopes, was performed at the GANIL laboratory with the use of the AGATA segmented HPGe tracking array, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The nuclei of interest were populated in transfer and deep-inelastic processes induced by an 18O beam at 126 MeV (7.0 MeV/u) on a 181Ta target. This paper contains a brief description of a novel implementation of a Monte-Carlo technique, which allowed us to obtain excited states lifetimes in the range from tens to hundreds femtoseconds for a reaction with complex initial velocity distribution, making use of the Doppler-shift attenuation method (DSAM). As a test case, we present here the analysis for two states in 19O: 2371-keV 9/2+ and 2779-keV 7/2+, for which lifetimes of τ > 400 fs and τ = 140+50−40 fs were obtained, respectively, in agreement with literature values. This newly developed approach will be essential for short lifetimes measurements in neutron-rich systems, exploiting intense ISOL-type beams, currently under development.
- Subjects
PARIS (France); COMMERCIAL product testing; MAGNETIC spectrometer; EXCITED states; SCINTILLATORS; MEASUREMENT; ISOTOPES; NEUTRON spectroscopy; NEUTRON radiography
- Publication
Acta Physica Polonica B, 2020, Vol 51, Issue 3, p699
- ISSN
0587-4254
- Publication type
Article
- DOI
10.5506/APhysPolB.51.699