Shape evolution in the neutron-rich osmium isotopes: Prompt gamma-ray spectroscopy of Os-196
Tarih
2014Yazar
Pollarolo, G.
Soderstrom, P. -A.
STEFANINI, A. M.
Stezowski, O.
Szilner, S.
THEISEN, Ch.
UR, C. A.
Walshe, J.
Kusoglu, Aslı
VALIENTE-DOBON, J. J.
Mengoni, D.
Lunardi, S.
RODRIGUEZ, T. R.
Bazzacco, D.
JOHN, P. R.
Modamio, V.
Gadea, A.
Wheldon, C.
Alexander, T.
DE ANGELIS, G.
Ashwood, N.
Barr, M.
Benzoni, G.
Birkenbach, B.
BIZZETI, P. G.
BIZZETI-SONA, A. M.
Bottoni, S.
Bowry, M.
Bracco, A.
Browne, F.
Bunce, M.
Camera, F.
Cederwall, B.
Corradi, L.
CRESPI, F. C. L.
DESESQUELLES, P.
EBERTH, J.
Farnea, E.
Fioretto, E.
GOERGEN, A.
Gottardo, A.
GREBOSZ, J.
Grente, L.
Hess, H.
Jungclaus, A.
Kokalova, Tz.
KORICHI, A.
Korten, W.
Lenzi, S.
Leoni, S.
Ljungvall, J.
Maron, G.
MECZYNSKI, W.
MELON, B.
Menegazzo, R.
Michelagnoli, C.
Mijatovic, T.
Million, B.
MOLINI, P.
Montagnoli, G.
Montanari, D.
NAPOLI, D. R.
Nolan, P.
OZIOL, Ch.
Podolyak, Zs.
PULLIA, A.
Quintana, B.
Recchia, F.
REITER, P.
Roberts, O. J.
ROSSO, D.
Sahin, E.
SALSAC, M. -D.
Scarlassara, F.
Sferrazza, M.
SIMPSON, J.
Üst veri
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The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich Os-196 nucleus through in-beam gamma-ray spectroscopy using a two-proton transfer reaction from a Pt-198 target to a Se-82 beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident gamma rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of Os-196 were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even Os188-198 isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behavior towards predominately vibrational nuclei through triaxial configurations. An almost perfect gamma-unstable/triaxial rotor yrast band is predicted for Os-196 which is in agreement with the experimentally measured excited states.
Koleksiyonlar
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