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SUMMARY:CROSSING ROTATIONAL BANDS IN SUPERHEAVY EVEN-EVEN NUCLEI
DTSTART;VALUE=DATE-TIME:20220714T080000Z
DTEND;VALUE=DATE-TIME:20220714T083000Z
DTSTAMP;VALUE=DATE-TIME:20260608T104635Z
UID:indico-contribution-600@events.sinp.msu.ru
DESCRIPTION:Speakers: Alexander Efimov (PTI A.F. I.)\nFor even-even nuclei
 \, with the exception of the  only\, in yrast bands there is no manifestat
 ion of the reverse bending of the moment of inertia from the square of rot
 ation frequency (back-bending). This leads to the possibility of reproduci
 ng the level energies of yrast bands up to spins values   in the framework
  of the IBM1 phenomenology [1]. In present report the structure of the yra
 st band states was calculated within the framework of the microscopic vers
 ion of IBM1 [2\,3]\, where bosons with large spins up to   were used. The 
 calculation was carried out for \, since only for it the values of   were 
 measured up to high spins. The mapping of phonons to bosons is carried out
  by the traditional way. The wave functions in the boson representation ha
 ve the form   where   are wave functions containing a superposition of  -b
 osons only. Moreover\, the collectivization is so strong that the number o
 f quadrupole bosons   in  for the ground state. The Hamiltonian is taken i
 n the form   where    is the IBM1 Hamiltonian with parameters obtained fro
 m  -phonons and taking into account renormalizations due to  \, non-collec
 tive phonons\,  − energies of  -bosons.         The parameters that dete
 rmine the boson operators are calculated based on the microscopic procedur
 e. This leads to precise reproduction of energies up to spin   with an err
 or not exceeding a few keV. As can be seen from the presented figure\, the
  reproduction of the   values by using the IBM1 phenomenology [1] correspo
 nds to the experiment. The composition of the wave functions is presented 
 in the following figure and it shows a smooth replacement of the collectiv
 e component\, built only from  -bosons\, by components that include high-s
 pin pairs or  -bosons with momentums    Such smooth replacement explains t
 he absence of the back-bending and the smooth dependence of   on spin.\n\n
 https://events.sinp.msu.ru/event/8/contributions/600/
LOCATION: Физический ф-т\, СФА
URL:https://events.sinp.msu.ru/event/8/contributions/600/
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