Shape evolution in the neutron-rich osmium isotopes: Prompt gamma-ray spectroscopy of Os-196

JOHN, P.; Modamio, V.; VALIENTE-DOBON, J.; Mengoni, D.; Lunardi, S.; RODRIGUEZ, T.; Bazzacco, D.; Gadea, A.; Wheldon, C.; Alexander, T.; DE ANGELIS, G.; Ashwood, N.; Barr, M.; Benzoni, G.; Birkenbach, B.; BIZZETI, P.; BIZZETI-SONA, A.; Bottoni, S.; Bowry, M.; Bracco, A.; Browne, F.; Bunce, M.; Camera, F.; Cederwall, B.; Corradi, L.; CRESPI, F.; 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.; Kusoglu, Aslı; 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.; Nolan, P.; OZIOL, Ch.; Podolyak, Zs.; Pollarolo, G.; PULLIA, A.; Quintana, B.; Recchia, F.; REITER, P.; Roberts, O.; ROSSO, D.; Sahin, E.; SALSAC, M.; Scarlassara, F.; Sferrazza, M.; SIMPSON, J.; Soderstrom, P.; STEFANINI, A.; Stezowski, O.; Szilner, S.; THEISEN, Ch.; UR, C.; Walshe, J.

doi:10.1103/physrevc.90.021301

Shape evolution in the neutron-rich osmium isotopes: Prompt gamma-ray spectroscopy of Os-196

Atıf İçin Kopyala

JOHN P. R., Modamio V., VALIENTE-DOBON J. J., Mengoni D., Lunardi S., RODRIGUEZ T. R., ...Daha Fazla

PHYSICAL REVIEW C, cilt.90, sa.2, 2014 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 90 Sayı: 2
Basım Tarihi: 2014
Doi Numarası: 10.1103/physrevc.90.021301
Dergi Adı: PHYSICAL REVIEW C
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
İstanbul Üniversitesi Adresli: Evet

Özet

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.