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beta-decay studies of Sn135-137 using selective resonance laser ionization techniques

J. Shergur ; B. A. Brown ; V. Fedoseyev ; U. Koster ; K. L. Kratz ; D. Sweryniak ; W. B. Walters ; A. Wohr ; D. Fedorov ; M. Hannawald ; M. Hjorth-Jensen ; V. Mishin ; B. Pfeiffer ; J. J. Ressler ; H. O. U. Fynbo ; P. Hoff ; H. Mach ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik ; Extern) ; Katarina Wilhelmsen Rolander (Institutionen för experimentell fysik, Subatomär fysik ; Extern) ; H. Simon ; A. Bickley
Physical Review C (0556-2813). Vol. 65 (2002), 3,
[Artikel, refereegranskad vetenskaplig]

The decays of the very neutron rich Sn isotopes Sn135-137 were studied at CERN/ISOLDE using isotopic and isobaric selectivity achieved by the use of a resonance ionization laser ion source and mass spectroscopy, respectively. Neutron decay rates, gamma-ray singles, and gamma-gamma coincidence data were collected as a function of time. The half-life (T-1/2) and delayed neutron emission probability (P-n) values of 135 Sn were measured to be 530(20) ms and 21(3)%, respectively. For Sn-136, a T-1/2 of 250(30) ms was determined along with a P-n value of 30(5)%. For Sn-137, a T-1/2 of 190(60) ms and a P-n value of 58(15)% were deduced. Identification of low-energy transitions in Sb-135 was made possible by comparison of laser-on and laser-off gamma-ray spectra. Those data combined with gamma-gamma coincidence spectra were used to construct a level scheme for Sb-135 that includes an unexpectedly low first excited state at 282 keV. A ground state beta branch of 33.2% was measured by following the growth and decay of the Sb-135 daughter. Shell-model calculations are consistent with the observed Sb-135 level structure and can account for a lowered first excited state.


Denna post skapades 2006-08-28. Senast ändrad 2014-09-02.
CPL Pubid: 11160


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Institutionen för experimentell fysik, Subatomär fysik (1900-2005)



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