 |
ßäåðíà ô³çèêà òà åíåðãåòèêà
ISSN:
1818-331X (Print), 2074-0565 (Online) |
| Home page | About |
Full text (en) Investigation of 0+ states in 228Th via two-neutron transfer: experimental data
A. I. Levon1, G. Grawaw2, R. Hertenberger2, P. G. Thirolf2, H.-F. Wirth2
1Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Fakultät für Physik, Ludwig-Maximilians-Universität München, Garching, Germany
Abstract: The excitation spectra in the deformed nucleus 228Th have been studied by means of the (p, t) reaction, using the Q3D spectrograph facility at the Munich Tandem accelerator. The angular distributions of tritons were measured for about 110 excitations seen in the triton spectra up to 2.5 MeV. Firm 0+ assignments are made for 17 excited states by comparison of experimental angular distributions with the calculated ones using the CHUCK3 code. Assignments up to spin 6+ are made for other states.
Keywords: 0+ states, collective bands, moments of inertia, nuclear models.
References:1. Levon A. I., de Boer J., Graw G. et al. The nuclear structure of 229Pa from the 231Pa(p, t)229Pa and 230Th(p, 2nγ)229Pa reactions. Nucl. Phys. A 576 (1994) 267. https://doi.org/10.1016/0375-9474(94)90260-7
2. Wirth H. -F., G. Graw, S. Christen et al. 0+ states in deformed actinide nuclei by the (p, t) reaction. Phys. Rev. C 69 (2004) 044310. https://doi.org/10.1103/PhysRevC.69.044310
3. Baltzer H., de Boer J., Gollwitzer A. et al. Study of low-lying 0+ excitations in 228Th and 232,234,236U in the (p, t) reaction. Z. Phys. A 356 (1996) 13. https://doi.org/10.1007/s002180050142
4. Levon A. I., Graw G., Eisermann Y. et al. Spectroscopy of 230Th in the (p, t) reaction. Phys. Rev. C 79 (2009) 014318. https://doi.org/10.1103/PhysRevC.79.014318
5. Dalmasso J., Maria H., Ardisson G. 228Th Nuclear States Fed in 228Ac Decay. Phys. Rev. C 36 (1987) 2510. https://doi.org/10.1103/PhysRevC.36.2510
6. Weber T., de Boer J., Freitag K. et al. Nuclear Levels in 228Th Populated in the Decay of 228Pa (II). Eur. Phys. J. A 3 (1998) 25. https://doi.org/10.1007/s100500050146
7. Schuler P., Lauterbach Ch., Agarwal Y. K. et al. High-Spin States in 224,226,228Th and the Systematics of Octupole Effects in Even Th Isotopes. Phys. Lett. B 174 (1986) 241. https://doi.org/10.1016/0370-2693(86)91091-9
8. Levon A. I., Alexa P., Pascu S. To the nature of 0+ states in 228Th studied by two-neutron transfer. Nucl. Phys. At. Energy 15 (2014) 7. https://jnpae.kinr.kyiv.ua/15.1/Articles_PDF/jnpae-2014-15-0007-Levon.pdf
9. Zanotti E., Bisenberger M., Hertenberger R. et al. A long position angle resolving light ion detector for the Munich Q3D magnetic spectrograph. Nucl. Instrum. Methods A 310 (1991) 706. https://doi.org/10.1016/0168-9002(91)91123-D
10. Wirth H. -F. A new cathode strip detector for the focal plane of the Munich Q3D magnetic spectrograph: Ph. D. thesis (Techn. Univ. Munchen, 2001). http://tumb1.biblio.tu-mubchen.de/publ/diss/ph/2001/wirth.html
11. Riess F. GASPAN at the UNIX computers: Annual Report (Beschleuniger Laboratorium München, 1991) p. 168.
12. Becchetti F.D., Greenlees G.W. Nucleon-Nucleus Optical-Model Parameters, A > 40, E < 50 MeV. Phys. Rev. 182 (1969) 1190. https://doi.org/10.1103/PhysRev.182.1190
13. Flynn E. R., Amstrong D. D., Beery J. G., Blair A. G. Triton Elastic Scattering at 20 MeV. Phys. Rev. 182 (1969) 1113. https://doi.org/10.1103/PhysRev.182.1113
14. Becchetti F. D., Greenlees G. W. Nucleon-Nucleus Optical-Model Parameters. Proc. Third Int. Symp. on polarization phenomena in nuclear reactions (Medison, 1970). Ed. by H. H. Barshall and W. Haeberli (Medison, University of Wisconsin Press, 1971) p. 68.
15. Kunz P. D. Computer code CHUCK3. University of Colorado, unpublished.