Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 15: Nuclear Structure and Dynamics I

HK 15.1: Vortrag

Montag, 16. März 2009, 16:30–16:45, H-ZO 40

Characterization of the 101 keV isomeric state in ⁷²Br — •José Antonio Briz Monago — IEM-CSIC, Madrid, Spain

Far from stability the main part of the Gamow-Teller (GT) strength is within the Q_β-window. Theoretical calculations [1] predict very different GT strength distributions for different deformations of the parent nucleus ground state (prolate-spherical-oblate) for neutron deficient nuclei in the mass region around A=70. This gives the opportunity to determine the deformation of a nucleus by the study of the beta decay with a highly sensitive setup.

Measurements of the _β-decay of ⁷²Kr were performed at ISOLDE with a Total Absorption Gamma Spectrometer (TAGS) but the analysis of the data has revealed the need for additional information. For this reason, complementary measurements have been performed in order to determine the conversion electron coefficients of the low energy transitions following the decay of ⁷²Kr. Of particular interest is the precise determination of the half-life of the 101 keV isomeric state and the multipolarity of the γ-transition connecting this state to the ground state as the spin of the latter one has been debated [2,3]. In this contribution, we will report the results obtained in this work.

[1] P. Sarriguren et al., Nucl. Phys. A658, 13 (1999)

[2] W.E. Collins et al., Phys. Rev. C9, 1457 (1974)

[3] I. Piqueras et al., Eur. Phys. J. A16, 313-329 (2003)