Universität zu Köln

Didierjean, F., Verney, D., Duchene, G., Litzinger, J., Sieja, K., Dewald, A., Goasduff, A., Lozeva, R., Fransen, C., de Angelis, G., Aydin, S., Bazzacco, D., Bracco, A., Bottoni, S., Corradi, L., Crespi, F., Ellinger, E., Farnea, E., Fioretto, E., Franchoo, S., Gottardo, A., Grocutt, L., Hackstein, M., Ibrahim, F., Kolos, K., Leoni, S., Lenzi, S., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Moeller, O., Montagnoli, G., Montanari, D., Morales, A. I., Napoli, D., Niikura, M., Recchia, F., Sahin, E., Scarlassara, F., Sengele, L., Szilner, S., Smith, J. F., Stefanini, A. M., Ur, C., Valiente-Dobon, J. J. and Vandone, V. (2017). Neutron effective single-particle energies above Ni-78: A hint from lifetime measurements in the N = 51 isotones Se-85 and Kr-87. Phys. Rev. C, 96 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: While the N = 50 shell-gap evolution towards Ni-78 is presently in the focus of nuclear structure research, experimental information on the neutron effective single-particle energy sequence above the Ni-78 core remain scarce. Direct nucleon-exchange reactions are indeed difficult with presently available post-accelerated radioactive-ion beams (especially for high orbital-momentum orbitals) in this exotic region. Purpose: In this study we probe the evolution of the vlg(7/2)effective single-particle energy which is a key to understanding the possible evolution of the spin-orbit splitting due to the proton-neutron interaction in the Ni-78 region. To achieve this goal, a method based on lifetime measurements is used for the first time. The obtained lifetimes of the 7/2(1)(-) states in Kr-87 and Se-85 are used to investigate the vlg7/2 evolution. Method: Yrast and near-yrast states in the light N = 51 isotones Se-85 and Kr-87 were populated via multinucleon transfer reactions, using a Se-82 beam and a U-238 target at the LNL tandem-ALPI facility. The prompt y rays were detected by the AGATA Demonstrator and particle identification was performed using the PRISMA spectrometer. Lifetime measurements were performed by using the Cologne plunger device for deep inelastic reactions and the Recoil Distance Doppler Shift technique. Results: We obtain (tau(7/21+)) = 0.4(-0.4)(+1.6) ps for Kr-87. In the case of Se-85 an upper limit of 3(2) ps is obtained for the (tau(7/21+)) value. Conclusion: For Kr-87, the measured (7/2(1)(+)) lifetime is consistent with a core-coupled 2(+) circle times v2d(5/2) configuration for this state. This result is consistent with that obtained by direct reaction, which validates our method. For Se-85, the measured (7/2(1)(+)) lifetime limit indicates a very small contribution of the vlg(7/2) configuration to the wave function of this state.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Didierjean, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Verney, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duchene, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Litzinger, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sieja, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dewald, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goasduff, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lozeva, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fransen, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED de Angelis, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aydin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bazzacco, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bracco, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bottoni, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Corradi, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Crespi, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ellinger, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Farnea, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fioretto, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Franchoo, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gottardo, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grocutt, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hackstein, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ibrahim, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kolos, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Leoni, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lenzi, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lunardi, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menegazzo, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mengoni, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Michelagnoli, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mijatovic, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Modamio, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moeller, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montagnoli, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Montanari, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Morales, A. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Napoli, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Niikura, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Recchia, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sahin, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scarlassara, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sengele, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Szilner, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stefanini, A. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ur, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Valiente-Dobon, J. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vandone, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-214057
DOI:	10.1103/PhysRevC.96.044320
Journal or Publication Title:	Phys. Rev. C
Volume:	96
Number:	4
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-SPIN EXCITATIONS; N=50; STABILITY; STATES; DECAY; SR-89 Multiple languages Physics, Nuclear Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/21405