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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:38 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Nuclear and Elementary Particles Physics II
Title:
Study of the 156Gd nucleus by the (p,t) reaction
Authors:
Alina-Nicoleta IONESCU (1,2), Sorin PASCU (2), Octavian SIMA (1)
Affiliation:
(1) University from Bucharest, Faculty of Physics
(2) Horia Hulubei National Institute for Physics and Nuclear Engineering
E-mail
ionescu_alina98@yahoo.com
Keywords:
angular distributions, Q3D spectrometer, (p,t) reaction, 0+ states
Abstract:
We present experimental results obtained by measuring the angular distributions, with good energy resolution (with Q3D spectrometer) for the direct two-neutron transfer reaction 158Gd(p,t)156Gd at an incident energy of 25 MeV.
The rare-earth region represents an ideal part of the nuclear chart for the study of collective motion. Some of the most important excitations in nuclei are the 0+ states. Because of the complexity of these states, theoretical models are having difficulties in describing even the lowest such excitations. On the experimental side, the (p,t) reaction is proved to be an ideal tool for providing complete spectroscopic information for the low spin states in even-even nuclei. Special attention can be given to observation of 0+ states which are particularly well revealed in this transfer reaction.
The case for study, 156Gd, presents a special interest. The Gd nuclei were among the first ones studied with the (p,t) reaction, in which a large number of excited 0+ states was found [1,2].
In the published data [3] the first excited 0+ state is populated with only 10% and no 0+ states were observed above 2.0 MeV. Our data show a rather weak state at 2.4 MeV while the first excited 0+ state is populated with about 16%. At this moment we cannot explain this discrepancy obtained in the two experiments.
In order to solve these problems we would like to perform another (p,t) experiment to measure complete angular distributions for the 0+ states up to an excitation energy of 4 MeV.
References:
[1] S.R. Lesher et al., Phys. Rev. C 66, 051305 (2002)
[2] D.A. Meyer et al., Phys. Rev. C 74, 044309 (2006)
[3] D.G. Fleming, C. Gunther, G. Hagemann, B. Herskind, P.O. Tjom, Phys. Rev. C 8, 806 (1973)
Acknowledgement:
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