Excited states in the neutron-deficient nuclei Rn-197,Rn-199,Rn-201
2008 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77, no 5, 054303-1-054303-7 p.Article in journal (Refereed) Published
Excited states of the extremely neutron-deficient radon isotopes with N = 111, 113, 115 have been studied for the first time in a series of in-beam experiments performed at the Accelerator Laboratory of the University of Jyvaskyla. The reactions used were: Sn-118(Kr-82, 3n)Rn-197, Sn-120(Kr-82, 3n)Rn-199, Sm-150(Cr-52, 3n)Rn-199, and Sn-122(Kr-82, 3n)Rn-201. The gamma rays emitted from excited states in the different isotopes were identified using the recoil-alpha-decay tagging technique. The estimated cross section for the production of Rn-197(m) was 7(3) nb, which is the lowest cross section reported so far for an in-beam study. The energies of the (17/2(+)) levels built on the isomeric (13/2(+)) states in Rn-197,Rn-199,Rn-201 indicate a transition from an anharmonic vibrational structure toward a rotational structure at low spins for these nuclei. However, the transition is not as sharp as predicted by theory.
Place, publisher, year, edition, pages
2008. Vol. 77, no 5, 054303-1-054303-7 p.
EVEN-EVEN NUCLEI; GAMMA-RAY SPECTROSCOPY; ALPHA-DECAY; MEAN-FIELD; ISOTOPES; RN-198
IdentifiersURN: urn:nbn:se:kth:diva-8208DOI: 10.1103/PhysRevC.77.054303ISI: 000256885600013ScopusID: 2-s2.0-43449092879OAI: oai:DiVA.org:kth-8208DiVA: diva2:13467
QC 201006202008-04-092008-04-092010-08-20Bibliographically approved