"Neutron-rich nuclei in the vicinity of 208Pb studied with the AGATA demonstrator"
Ryan Kempley, University of Surrey
(id #158)
Seminar: NoPoster: Yes
Invited talk: No
Neutron-rich nuclei in the vicinity of 208Pb studied with the AGATA demonstrator
R. S. Kempley1, Zs. Podolyák1, D. Bazzacco2, A. Gadea4, E. Farnea1, J. J. Valiente-Dobon3,
D. Mengoni2,5, F. Recchia2, E. Sahin3, A. Gottardo3, L. Corradi3, E. Fioretto3, S. Szilner9,
V. Anagnostatou1, N. Al-Dahan1, G. De Angelis3, M. Bellato2, L. Berti3, D. Bortolato2, M. Bowry1, M. Bunce1, P. Cocconi3, A. Colombo2, Zs. Dombrádi10, C. Fanin2 , W. Gelletly1, R. Isocrate2,
S. Ketenci7, N. Kohdratiev9, I. Kuti10, P.J.R. Mason1, C. Michelagnoli3, T. Mijatovic9, P. Molini2, G. Montagnioli2, D. Montanari2, M. Nakhostin1, D.R. Napoli3, D. Pellegrini2, P.H. Regan1, G. Rampazzo2, P. Reiter6, D. Rosso3,F. Scarlassara2, A. Stefanini3, P. P. Singh3, N. Toniolo3, C.A. Ur2 and the AGATA Collaboration
1Dept. of Physics, Univ.of Surrey, Guildford, UK .
2INFN Sezione di Padova and Università di Padova, Italy.
3INFN, LNL, Legnaro, Italy. 4CSIC-IFIC Valencia, Spain.
5Univ. of West Scotland, Paisley, Scotland, UK.
6IKP, Universität zu Köln, Germany. 7 NigdeUniversity,Turkey.
8Flerov Laboratory, JINR, Dubna, Russia. 9IRB Zagreb, Croatia.
10ATOMKI, Debrecen, Hungary.
Experimental information on the neutron-rich nuclei in the vicinity (‘south’ and south-east’) of 208Pb is scarce, with information on excited states restricted to a small number of nuclei. An experiment with the aim to obtain information on the shell-model states in nuclei along the N=126 line, as well as in nuclei with N>126, Z<82 was performed in May 2010 at Legnaro, Italy. The experimental information on the structure of these nuclei, such as the energies of excited states with simple configurations, can be used as building blocks for calculating more complex configurations.
One of the main aims of the experiment was to obtain information on the yrast structure of 208Tl. The understanding of the one proton-hole, one neutron-particle 208Tl nucleus is crucial for the whole Z<82 and N>126 region. In the present experiment we expect to identify yrast and possibly close to yrast states involving the high–j orbitals πh-111/2, νi11/2 and νj15/2. Shell model calculations indicate that the states with πh-111/2νg9/2 configuration are yrast at ~1.2 MeV, with the πh-111/2νi11/2 and πh-111/2νj15/2 configurations forming the yrast line above 2 MeV excitation energy.
The nuclei of interest were populated by impinging a 136Xe beam on a 1 mg/cm2 thick 208Pb target placed at an angle of 40 degrees with respect to the beam. The beam, provided by the PIAVE+ALPI accelerator complex had an energy of 930 MeV, ~30% above the Coulomb barrier. The gamma rays were detected with the AGATA demonstrator [1,2], positioned at 18.8 cm from the target. Three triple clusters where in operation, with PRISMA placed at 42° with respect to the beam. The beam-like products were identified event-by-event using the PRISMA magnetic spectrometer. Information on the heavy target-like nuclei is obtained by selectin
R. S. Kempley1, Zs. Podolyák1, D. Bazzacco2, A. Gadea4, E. Farnea1, J. J. Valiente-Dobon3,
D. Mengoni2,5, F. Recchia2, E. Sahin3, A. Gottardo3, L. Corradi3, E. Fioretto3, S. Szilner9,
V. Anagnostatou1, N. Al-Dahan1, G. De Angelis3, M. Bellato2, L. Berti3, D. Bortolato2, M. Bowry1, M. Bunce1, P. Cocconi3, A. Colombo2, Zs. Dombrádi10, C. Fanin2 , W. Gelletly1, R. Isocrate2,
S. Ketenci7, N. Kohdratiev9, I. Kuti10, P.J.R. Mason1, C. Michelagnoli3, T. Mijatovic9, P. Molini2, G. Montagnioli2, D. Montanari2, M. Nakhostin1, D.R. Napoli3, D. Pellegrini2, P.H. Regan1, G. Rampazzo2, P. Reiter6, D. Rosso3,F. Scarlassara2, A. Stefanini3, P. P. Singh3, N. Toniolo3, C.A. Ur2 and the AGATA Collaboration
1Dept. of Physics, Univ.of Surrey, Guildford, UK .
2INFN Sezione di Padova and Università di Padova, Italy.
3INFN, LNL, Legnaro, Italy. 4CSIC-IFIC Valencia, Spain.
5Univ. of West Scotland, Paisley, Scotland, UK.
6IKP, Universität zu Köln, Germany. 7 NigdeUniversity,Turkey.
8Flerov Laboratory, JINR, Dubna, Russia. 9IRB Zagreb, Croatia.
10ATOMKI, Debrecen, Hungary.
Experimental information on the neutron-rich nuclei in the vicinity (‘south’ and south-east’) of 208Pb is scarce, with information on excited states restricted to a small number of nuclei. An experiment with the aim to obtain information on the shell-model states in nuclei along the N=126 line, as well as in nuclei with N>126, Z<82 was performed in May 2010 at Legnaro, Italy. The experimental information on the structure of these nuclei, such as the energies of excited states with simple configurations, can be used as building blocks for calculating more complex configurations.
One of the main aims of the experiment was to obtain information on the yrast structure of 208Tl. The understanding of the one proton-hole, one neutron-particle 208Tl nucleus is crucial for the whole Z<82 and N>126 region. In the present experiment we expect to identify yrast and possibly close to yrast states involving the high–j orbitals πh-111/2, νi11/2 and νj15/2. Shell model calculations indicate that the states with πh-111/2νg9/2 configuration are yrast at ~1.2 MeV, with the πh-111/2νi11/2 and πh-111/2νj15/2 configurations forming the yrast line above 2 MeV excitation energy.
The nuclei of interest were populated by impinging a 136Xe beam on a 1 mg/cm2 thick 208Pb target placed at an angle of 40 degrees with respect to the beam. The beam, provided by the PIAVE+ALPI accelerator complex had an energy of 930 MeV, ~30% above the Coulomb barrier. The gamma rays were detected with the AGATA demonstrator [1,2], positioned at 18.8 cm from the target. Three triple clusters where in operation, with PRISMA placed at 42° with respect to the beam. The beam-like products were identified event-by-event using the PRISMA magnetic spectrometer. Information on the heavy target-like nuclei is obtained by selectin
