ELFT HÍRADÓ

["Janos Timar" <timar AT namafia.atomki.hu>]

***************************************************************************** 

                         MAGFIZIKAI SZEMINARIUM 

                2008. majus 20-an, kedden 11:00  orakor 

          az MTA Atommagkutato Intezetenek nagy eloadotermeben 
                   (a ciklotron epuletenek 3.emeleten) 

                       Prof. J.F. Sharpey-Schafer 
                   Fokvaros, Dél-afrikai Koztarsasag 

THE DISAPPEARANCE OF BETA-VIBRATIONS AND THE CONCEPT OF THE "SECOND VACUUM" 

                           c. eloadast tart, 

              melyre minden erdeklodot szeretettel varunk. 
                                                                          
                                                     Cseh Jozsef             
                                                    
cseh AT atomki.hu
 

Az eloadas kivonata: 

It has recently become clear [1] that the first excited 0+ states in the 
N = 90 and N = 88 nuclei are not beta-vibrational excitations but are rather 
a "second vacuum" state in the style of the "pairing isomers" described by 
Ragnarsson and Broglia [2]. This second vacuum |02+>  has gamma and 
octupole vibrations built upon it in the same manner as the ground state 
vacuum |01+>. There is no sign of beta-vibrations, which must be above 
1.5MeV in excitation energy near the particle-hole excitations of |01+>. 

This is very bad news for both the compilers of nuclear data [3], the writers 
of textbooks (for example [4-7]) and for the authors of the flurry of 
publications [8-14] during the last decade basing their interpretation of the 
structure of the rare-earth transitional nuclei on the Bohr Hamiltonian [15]. 

The relevant data on Gd and Sm nuclei will be presented and the consequences 
for current theories of the structure of the Transitional Rare Earth nuclei 
will be discussed. 

[1]  J F Sharpey-Schafer, S M Mullins, R A Bark, E Gueorguieva, J Kau, F 
Komati, J J Lawrie, P Maine, S H T Murray, N J Ncapayi  and P Vymers; Proc. 
XLVI Int. Winter Meeting on Nuc. Phys.; Bormio, Italy (2008); Univ. degli 
Studi di Milano  Eds. I Iori, A Tarantola, (to be published). 
[2]  I. Ragnarsson and R. A. Broglia, Nucl. Phys. A263, 315 (1976). 
[3]  R B Firestone, V S Shirley et al; Table of  Isotopes 8th ed (1996) Wiley 
[4]  J M Eisenberg and W Greiner; Nuclear Models Vol. 1, 3rd Ed. (1987) 
Elsvier, p 185 
[5]  W Greiner and J A Maruhm; Nuclear Models (1996) Springer, p 159 
[6]  P Ring and P Schuck; The Nuclear Many Body Problem, 3rd printing (2004) 
Springer, p 24 
[7]  K Heyde; Basic Ideas and Concepts in Nuclear Physics, 3rd Ed. (2004) 
IoP, p 432 
[8]  F Iachello; PRL 87(2001)052502 
[9]  R F Casten and N V Zamfir; PRL 87(2001)052503 
[10] A Leviatan and J N Ginocchio; PRL 90(2003)212501 
[11]  R Krücken et al; PRL 88(2002)232501 
[12] J Jolie et al; PRL 89(2002)182502 
[13] L Fortunato; Eur. Phys. J. A (2005) .................. 
[14] M A Caprio; Phys. Rev. C72 (2005) 054323 
[15] A Bohr; Mat. Fys. Medd. Dan. Vid. Selsk. 24 (1952) No.14 

******************************************************************************