Lifetime measurement in the femtoseconds range in neutron-rich light nuclei with the AGATA tracking array

Ziliani, S. (2020) Lifetime measurement in the femtoseconds range in neutron-rich light nuclei with the AGATA tracking array. Il nuovo cimento C, 43 (4-5). pp. 1-10. ISSN 1826-9885

Text ncc12106.pdf - Published Version Download (561kB)

Abstract

An extension of the Doppler-Shift Attenuation Method (DSAM) was implemented in order to perform nuclear state lifetime measurements down to tens-to-hundreds of femtoseconds in the case of complex reaction mechanisms, such as heavy-ions transfer and deep-inelastic reactions. This novel technique will have an impact in future studies of exotic neutron-rich systems produced with highintensity radioactive ISOL-type beams. We describe here the method, in the context of an experiment realised with the aim of measuring the lifetime of excited states in neutron-rich light nuclei of C, N and O, with the combined use of the gamma detection AGATA and PARIS arrays, coupled to the VAMOS++ magnetic spectrometer in GANIL (France). The nuclei of interest were populated with low-energy transfer and deep-inelastic reactions induced by a 18O beam on a thick 181Ta target. As a test case for the technique validation, we show the lifetime measurement of the 1/2− 1 state at 3055.36(16) keV in 17O: a lifetime value of τ = 159+40−30 fs was obtained, in agreement with the literature. The impact of the excellent performance of the AGATA tracking array will be also highlighted. Finally, the new technique will be exploited to measure the lifetime of a newly discovered state in 18N, at 2404.6(13) keV.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	18 Mar 2021 08:59
Last Modified:	18 Mar 2021 08:59
URI:	http://eprints.bice.rm.cnr.it/id/eprint/20840

Actions (login required)

View Item