Lifetime measurement of the first excited2+state in108Te

Acta Physica Polonica B, 2013

Physical Review C, 2015

Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich 84,86 Se are investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was performed at the Istituto Nazionale di Fisica Nucleare (INFN) Laboratori Nazionali di Legnaro using the Cologne Plunger device for the RDDS technique and the AGATA Demonstrator array for the γ-ray detection coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In 86 Se the level lifetime of the yrast 2 + 1 state and an upper limit for the lifetime of the 4 + 1 state are determined for the first time. The results of 86 Se are in agreement with previously reported predictions of large-scale shell-model calculations using Ni78-I and Ni78-II effective interactions. In addition, intrinsic shape parameters of lowest yrast states in 86 Se are calculated. In semimagic 84 Se level lifetimes of the yrast 4 + 1 and 6 + 1 states are determined for the first time. Large-scale shell-model calculations using effective interactions Ni78-II, JUN45, jj4b, and jj4pna are performed. The calculations describe B(E2; 2 + 1 → 0 + 1) and B(E2; 6 + 1 → 4 + 1) fairly well and point out problems in reproducing the experimental B(E2; 4 + 1 → 2 + 1).

2022

Isomeric states of the neutron-rich isotope Ta 116 73 189 were populated via fragmentation of a primary beam of 208 Pb ions at 1 GeV/u impinging on a 9 Be target at GSI, Darmstadt, Germany. The isotopes of interest were separated, identified and delivered to the DESPEC setup. Two isomers were deduced in 189 Ta116 and their lifetimes were measured based on the γ-ray time distributions.

European Physical Journal A, 2009

In a series of experiments performed at the velocity filter SHIP, new or improved decay data of neutron-deficient isotopes of elements from mendelevium (Z = 101) to hassium (Z = 108) were obtained. In particular, evidence for $ \alpha$ -decay or electron capture from isomeric states in 265Hs and 258Db was found.

Acta Physica Polonica B, 2016

Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments were measured using the recoil distance Doppler shift (RDDS) technique, which was applied to fusion-fission reactions in inverse kinematics for the first time. The fission fragments were identified eventby-event in mass, charge, and atomic number using the VAMOS magnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were measured with the EXOGAM array of Ge Clover detectors around the target position. Using a degrader, the change in the Doppler shift of the γ ray allows the application of the RDDS method. Details of the experimental technique will be discussed and the status for the ongoing analysis for odd-mass yttrium isotopes will be presented.

Physical Review C, 2009

The low-lying structure of 188,190,192 W have been studied following beta-decays of the neutron-rich mother nuclei 188,190,192 Ta, produced following the projectile fragmentation of a 1 GeV per nucleon 208 Pb primary beam on a natural Be target at the GSI Fragment Separator. The beta-decay half lives of 188,190,192 Ta have been measured, together with gamma-ray decays of low-lying states in their respective W daughter nuclei using heavy-ion-beta-gamma correlations utilising a position sensitive silicon detector set-up. The data provide information on the low-lying excited states in 188,190,192 W, which highlight a change in nuclear shape at 190 W compared with lighter W isotopes. This evolution of ground state structure along the W isotopic chain is discussed as evidence for a possible proton sub-shell effect for the A ∼190 region and is consistent with the maximisation of the γ-softness of the nuclear potential around N ∼116.

Physical review, 2013

Lifetimes of the low-lying (11/2 −) states in 63,65 Co have been measured employing the recoil distance doppler shift method (RDDS) with the AGATA γ-ray array and the PRISMA mass spectrometer. These nuclei were populated via a multinucleon transfer reaction by bombarding a 238 U target with a beam of 64 Ni. The experimental B(E2) reduced transition probabilities for 63,65 Co are well reproduced by large-scale shell-model calculations that predict a constant trend of the B(E2) values up to the N = 40 67 Co isotope.

Physical Review C

AIP Conference Proceedings, 2005

The possible occurrence of sub-shell gaps at N = 32 and N = 34 in neutron-rich titanium isotopes is discussed in light of new experimental results from (i) deep-inelastic reactions measured with Gammasphere at the ATLAS facility at Ar gonne National Laboratory and from (ii) intermediate-energy Coulomb excitation performed at the National Superconducting Cyclotron Laboratory at Michigan State University.

Nuclear Physics A, 2000