Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se84,86 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 Se86 the level lifetime of the yrast 21+ state and an upper limit for the lifetime of the 41+ state are determined for the first time. The results of Se86 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 Se86 are calculated. In semimagic Se84 level lifetimes of the yrast 41+ and 61+ 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;21+→01+) and B(E2;61+→41+) fairly well and point out problems in reproducing the experimental B(E2;41+→21+).
Transition probabilities in neutron-rich Se 84,86 / J. Litzinger, A. Blazhev, A. Dewald, F. Didierjean, G. Duchêne, C. Fransen, R. Lozeva, K. Sieja, D. Verney, G. De Angelis, D. Bazzacco, B. Birkenbach, S. Bottoni, A. Bracco, T. Braunroth, B. Cederwall, L. Corradi, F.C.L. Crespi, P. Désesquelles, J. Eberth, E. Ellinger, E. Farnea, E. Fioretto, R. Gernhäuser, A. Goasduff, A. Görgen, A. Gottardo, J. Grebosz, M. Hackstein, H. Hess, F. Ibrahim, J. Jolie, A. Jungclaus, K. Kolos, W. Korten, S. Leoni, S. Lunardi, A. Maj, R. Menegazzo, D. Mengoni, C. Michelagnoli, T. Mijatovic, B. Million, O. Möller, V. Modamio, G. Montagnoli, D. Montanari, A.I. Morales Lopez, D.R. Napoli, M. Niikura, G. Pollarolo, A. Pullia, B. Quintana, F. Recchia, P. Reiter, D. Rosso, E. Sahin, M.D. Salsac, F. Scarlassara, P. Söderström, A.M. Stefanini, O. Stezowski, S. Szilner, C. Theisen, J.J. Valiente Dobón, V. Vandone, A. Vogt. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 92:6(2015 Dec), pp. 064322.1-064322.6. [10.1103/PhysRevC.92.064322]
Transition probabilities in neutron-rich Se 84,86
S. Bottoni;A. Bracco;F.C.L. Crespi;S. Leoni;A.I. Morales Lopez;A. Pullia;V. Vandone;
2015
Abstract
Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se84,86 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 Se86 the level lifetime of the yrast 21+ state and an upper limit for the lifetime of the 41+ state are determined for the first time. The results of Se86 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 Se86 are calculated. In semimagic Se84 level lifetimes of the yrast 41+ and 61+ 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;21+→01+) and B(E2;61+→41+) fairly well and point out problems in reproducing the experimental B(E2;41+→21+).
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