C. Plettner

Beta decay of medium and high spin isomers in 94Ag

Abstract The very neutron-deficient isotope 94 Ag was produced at the GSI on-line mass separator by using the reaction 58 Ni( 40 Ca,xa0p3n). The β -decay properties of 94 Ag were studied by detecting for the first time β -delayed γ rays and β – γ – γ coincidences. Both the population of excited levels in the daughter nucleus 94 Pd and the β -decay half-life of 94 Ag were investigated. The major part of the feeding was assigned to the decay of an I π =(7 + ) isomer with a half-life of (0.36±0.03)xa0s. Axa0weak β -decay branch was found to populate high-spin levels in the 94 Pd daughter with I ⩾18. It is tentatively assigned to the decay of a high-spin parent state in 94 Ag with I ⩾17 and a half-life (0.3±0.2)xa0s. The measured β -decay properties as well as the level structure of 94 Ag and 94 Pd are discussed in comparison with shell-model predictions.

Isomerism in 96Ag and non-yrast levels in 96Pd and 95Rh, studied in β decay

The β decay of 96Ag (Z=47,N=49) was investigated by measuring positrons, X rays as well as β-delayed protons and γ rays. The γ radiation was studied by means of germanium detectors and a NaI total-absorption spectrometer. Two β-decaying isomers in 96Ag were established with half-lives of 4.40(6) and 6.9(6) s and tentative spin–parity assignments of (8+) and (2+), respectively. For both isomers, the intensities of β transitions to low-lying levels of 96Pd (Z=46,N=50) and β-delayed proton decays to levels in 95Rh (Z=45,N=50) were measured. Several new 96Pd levels were firmly established. The level energies, their γ decays and the Gamow–Teller decay of 96Ag are compared to shell-model predictions. A new low-lying level in 95Rh was found at 680 keV excitation energy. Through a comparison with low-lying states of N=50 isotones, this level is interpreted as the first excited 7/2+ state built on the proton 9/2+ ground state. The assignments of further excited states in 95Rh are discussed.

Shape coexistence at high spin in the N = Z+2 nucleus Se-70

The nucleus Se-70 was studied using the Ca-40(Ca-40, 2alpha2p) reaction at a beam energy of 185 MeV. Gamma rays were measured with the EUROBALL III spectrometer. The known positive-parity bands have been extended and one new band of positive parity and two of negative parity have been identified. These bands are interpreted in terms of the cranked Nilsson-Strutinsky approach. Calculations suggest that the two negative-parity bands, which have the same signature, are both based on a configuration with two protons and three neutrons lifted from the fp shell to the g(9/2) orbital, but at different nuclear shapes. This represents a shape coexistence at high spin.

Very high rotational frequencies and band termination in 73Br

Rotational bands in

Beta‐delayed proton decay of a high‐spin isomer of 94Ag

{}^{73}mathrm{Br}

Intrinsic state lifetimes in {sup 103}Pd and {sup 106,107}Cd

have been investigated up to spins of

Revisiting anomalous B(E2;4{sub 1}{sup +}{yields}2{sub 1}{sup +})/B(E2;2{sub 1}{sup +}{yields}0{sub 1}{sup +}) values in {sup 98}Ru and {sup 180}Pt

I=65/2

Lifetimes of high-spin states in 74Kr

using the EUROBALL III spectrometer. One of the negative-parity bands displays the highest rotational frequency

Recent results from β‐decay studies in the 100Sn region

ensuremath{Elzxh}ensuremath{omega}=1.85mathrm{MeV}

Observation of proton radioactivity of the (21+) high-spin isomer in 94Ag.

reported to date in nuclei with