Possible observation of the orbital in 96249Cm
作者： I. Ahmad , B.B. Back , R.R. Chasman , J.P. Greene , T. Ishii
DOI: 10.1016/S0375-9474(98)00618-6
关键词: Spectrometer 、 Angular momentum 、 Momentum 、 Cyclotron 、 Alpha particle 、 Spectral line 、 Atomic physics 、 Excitation 、 Ion 、 Physics
摘要: Abstract The position of the K 17 2 shell orbital plays a significant role in determining correction energy and hence stability superheavy elements. A deformed component this orbital, 1 + [880] , comes down with increasing prolate deformation, is expected to have an excitation less than MeV nuclei N = 153. We performed reaction 248Cm(4He,3He) using 98.5-MeV alpha particles from IUCF cyclotron populate high-l states 249Cm. preferentially excites because angular momentum mismatch. emerging 3He ions were analyzed K600 magnetic spectrometer. Spectra measured at θcm 4.1°, 6.1°, 10.2°, 12.2°, 16.2° spectrometer was calibrated 208Pb(4He,3He) 232Th(4He,3He) reactions same incident energy. Three strong peaks identified spectrum these been given tentative assignments: 593 keV, 15 11 − [725] ; 1560 keV 1898 13 [716] . Our data do not distinguish between assignments.
harvard.edu
elsevier.com
sci-hub.se 参考文章(15)
Robert Tickle, W.S. Gray, The 208Pb(α, 3He)209Pb reaction at 58 MeV Nuclear Physics A. ,vol. 247, pp. 187- 194 ,(1975) , 10.1016/0375-9474(75)90629-6
R. R. Chasman, I. Ahmad, A. M. Friedman, J. R. Erskine, Survey of single-particle states in the mass region A>228 Reviews of Modern Physics. ,vol. 49, pp. 833- 891 ,(1977) , 10.1103/REVMODPHYS.49.833
T. Grotdal, J. Limstrand, K. Nybø, K. Skår, T.F. Thorsteinsen, Energy levels in 231Th and 233Th Nuclear Physics A. ,vol. 189, pp. 592- 608 ,(1972) , 10.1016/0375-9474(72)90316-8
F.S. Stephens, M.D. Holtz, R.M. Diamond, J.O. Newton, Coulomb excitation of 235U Nuclear Physics A. ,vol. 115, pp. 129- 156 ,(1968) , 10.1016/0375-9474(68)90647-7
R.R. Chasman, I. Ahmad, Nuclear structure at A ∼250 and the stability of the superheavy elements Physics Letters B. ,vol. 392, pp. 255- 261 ,(1997) , 10.1016/S0370-2693(96)01591-2
Th.W. Elze, J.R. Huizenga, Energy levels of 243Am excited by the 242Pu(3He, d) and 242Pu(α, t) reactions Nuclear Physics A. ,vol. 149, pp. 585- 592 ,(1970) , 10.1016/0375-9474(70)91049-3
W. Bertozzi, M.V. Hynes, C.P. Sargent, C. Creswell, P.C. Dunn, A. Hirsch, M. Leitch, B. Norum, F.N. Rad, T. Sasanuma, Focal plane instrumentation: A very high resolution MWPC system for inclined tracks Nuclear Instruments and Methods. ,vol. 141, pp. 457- 476 ,(1977) , 10.1016/0029-554X(77)90639-5
C. P. Massolo, F. Azaiez, S. Galès, S. Fortier, E. Gerlic, J. Guillot, E. Hourani, J. M. Maison, Damping of high-spin single-particle strengths in 209Pb. Physical Review C. ,vol. 34, pp. 1256- 1261 ,(1986) , 10.1103/PHYSREVC.34.1256
R. W. Hoff, W. F. Davidson, D. D. Warner, H. G. Börner, T. von Egidy, Energy levels of /sup 249/Cm from measurements of thermal neutron capture gamma rays Physical Review C. ,vol. 25, pp. 2232- 2254 ,(1982) , 10.1103/PHYSREVC.25.2232
I. Ahmad, A. M. Friedman, R. R. Chasman, S. W. Yates, Proton orbital 1/2/sup -/(521) and the stability of superheavy elements Physical Review Letters. ,vol. 39, pp. 12- 15 ,(1977) , 10.1103/PHYSREVLETT.39.12