TY - JOUR

T1 - The Kπ = 0+ bands of 178Hf and the allowed unhindered beta transformations of 9.3 min 178Ta and 22 d 178W

AU - Nielsen, H.L.

AU - Wilsky, K.

AU - Zylicz, J.

AU - Sørensen, G.

PY - 1967

Y1 - 1967

N2 - The decay of 22 d 178W and 9.3 min 178Ta (1+) has been investigated by means of direct and coincidence spectrometry with Ge(Li) and scintillation detectors. The Q-value of the electron-capture decay of 178W was determined to be 89±2 keV from the K-capture-to-total capture ratio. The corresponding log ft value is 4.65. The ground-state-to-ground-state beta decay rates were analysed in light of the pair correlation scheme. Capture-to-positon ratios were deduced for 178Ta and found to agree with theory. Excited states in 178Hf (characterized by their energy in keV, spin and parity) were established at 1199(0+), 1276(2+), 1434(0+), 1444(0+), 1496(2+), 1514(2+, 1+ or 1−) and 1561(2+). The 1199 keV state is interpreted as a beta vibration, the 1434 and 1444 keV 0+ states contain probably large amplitudes of the View the MathML source [514] neutron pair of the View the MathML source[514] proton pair (labelled by Nilsson quantum numbers View the MathML source. Energies and beta decay rates for the 0+ states are compared with the calculations of Soloviev. The energy of the third excited 0+ state is found to be much lower than this theory predicts. The first excited Kπ = 0+ band is less strongly fed in beta decay than the calculations predict.

AB - The decay of 22 d 178W and 9.3 min 178Ta (1+) has been investigated by means of direct and coincidence spectrometry with Ge(Li) and scintillation detectors. The Q-value of the electron-capture decay of 178W was determined to be 89±2 keV from the K-capture-to-total capture ratio. The corresponding log ft value is 4.65. The ground-state-to-ground-state beta decay rates were analysed in light of the pair correlation scheme. Capture-to-positon ratios were deduced for 178Ta and found to agree with theory. Excited states in 178Hf (characterized by their energy in keV, spin and parity) were established at 1199(0+), 1276(2+), 1434(0+), 1444(0+), 1496(2+), 1514(2+, 1+ or 1−) and 1561(2+). The 1199 keV state is interpreted as a beta vibration, the 1434 and 1444 keV 0+ states contain probably large amplitudes of the View the MathML source [514] neutron pair of the View the MathML source[514] proton pair (labelled by Nilsson quantum numbers View the MathML source. Energies and beta decay rates for the 0+ states are compared with the calculations of Soloviev. The energy of the third excited 0+ state is found to be much lower than this theory predicts. The first excited Kπ = 0+ band is less strongly fed in beta decay than the calculations predict.

U2 - 10.1016/0375-9474(67)90279-5

DO - 10.1016/0375-9474(67)90279-5

M3 - Journal article

SN - 0375-9474

VL - 93

SP - 385

EP - 407

JO - Nuclear Physics A: Nuclear and Hadronic Physics

JF - Nuclear Physics A: Nuclear and Hadronic Physics

ER -