Electromagnetic transition probabilities in odd-mass erbium isotopes

Andrejtscheff, W.; Manfrass, P.; Prade, H.; Schilling, K. D.; Winter, G.; Fuia, H.; Ion-Mihai, R.; Khalikulov, A.B.; Morozov, V. A.; Marupov, N.Z.; Muminov, T.M.

doi:10.1016/0375-9474(74)90127-4

Cited by 34 publications

(9 citation statements)

References 18 publications

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“…Sometimes, small admixtures in the wave functions or shifts of the Fermi level influencing the pairing factors could provide drastic changes in the transition matrix elements especially of E1 transitions [11].…”

Section: High Spin Levelsmentioning

confidence: 99%

p-n Multiplets and band-like structures in106Ag

Andrejtscheff

Kostov

Kostova

et al. 1988

Z. Physik A - Atomic Nuclei

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Section: High Spin Levelsmentioning

confidence: 99%

p-n Multiplets and band-like structures in106Ag

Andrejtscheff

Kostov

Kostova

et al. 1988

Z. Physik A - Atomic Nuclei

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“…This structure is observed as an isomer in the nearby 163 Er and 165 Er nuclides, with half-lives of T 1/2 = 0.58 μs [16] and T 1/2 = 0.25 μs [17] and excitation energies of 445 and 551 keV, respectively. In Fig.…”

Section: A Isomer In 161 Dymentioning

confidence: 99%

“…In the out-of-beam γ -γ matrix, a gate on the 13/2 − → 11/2 − transition within the known K π = 11/2 − isomer band in 165 Er (E = 551 keV; T 1/2 = 0.25 μs [17]) showed evidence for another isomer, at 1823.0(2) keV, decaying by a 317.0-keV γ -ray transition through an unknown band into the band based on the isomer [see Fig. 13(a)].…”

Section: Isomer In 165 Ermentioning

confidence: 99%

Discovery of isomers in dysprosium, holmium, and erbium isotopes withN=94to 97

et al. 2012

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High-spin states in the 164 68 Er 96 region were studied using 9 Be + 160 Gd reactions. Pulsed beam conditions were exploited for enhanced sensitivity to delayed γ -ray transitions. New isomers were identified in 161 Dy, 163 Ho, 162 Er, and 165 Er. The 162 Er isomer is interpreted to decay by E1 transitions to the ground-state band with a reduced hindrance of f ν = 33. A plot of f ν values for all K = 7, E1 transitions from two-quasiparticle isomers to the ground-state bands of even-even nuclei reveals only a small influence from the dynamic to kinematic moment-of-inertia ratio, which provides a measure of Coriolis K mixing within the ground-state band. This is interpreted to imply that the relatively low hindrances are due to K mixing in the isomer, caused by a combination of Coriolis and octupole band mixing.

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“…The pairing factors Pro, were taken from model calculations [11]. They were found to be realistic enough [7,9,12] Table 1, it is evident that the values GGex p in doubly-odd nuclei are systematically up to several times larger than those in the odd-A neighbours. There are two exceptions in Table 1: (i) The experimental B(EI) value in l VSHf is only an average estimate from the lower and upper limits given in Reference 13, i.e.…”

Section: 27mentioning

confidence: 99%

“…The reduced transition probability B(E1) between mixed initial (i) and final (f) states reads [8,9]:…”

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confidence: 99%

Collective contributions to E1, ?K=1 matrix elements in odd-odd deformed nuclei

Andrejtscheff

Schilling

1978

Z Physik A

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The half-life of the 184.3keV state in 165Dy has been remeasured as "F1/2 = 1.0+_0.1 ns in order to deduce a reliable value for the transition matrix element of the depopulating E 1, AK=I transition. Experimental El, AK=I transition matrix elements in odd-odd deformed nuclei are found to be systematically larger than similar values in adjacent odd-A isotones. This effect is supposed to be associated with higher-order vibrational admixtures coupled via RPC and p-n interaction mixings.Earlier theoretical studies [1] suggested that the quasiparticle-phonon interaction in odd-odd deformed nuclei is expected to play a more important role than in odd-A nucleides. Model-dependent investigations of transition probabilities performed earlier on the basis of Nilsson hindrance factors [2] did not reveal any appreciable differences between these quantities in both kinds of nucleides. The present work deals with a new measurement in t65Dy-relevant for the present considerations-and a more detailed analysis of E1 transition matrix elements including also recent experimental results [3,4]. A preliminary communication of some of the present results was already given in [3] ponents in the time distribution cannot unambiguously be separated in this case. In the present work, lifetime measurements were performed in the (n, ?) reaction by means of the method of delayed ;,-y coincidences using a plastic scintillator and a planar Ge(Li) detector (cf. Fig. 1). The target consisted of t64Dy20 3 enriched to 97.0~. The experimental methods and techniques used at the Rossendorf research reactor as well as the analysing procedure have been described earlier (cf. e.g. Refs. 3, 7). According to this procedure, time distributions of ;,-ray transitions were obtained after subtracting the ,.'-ray background contributions. Then, information on the lifetimes was deduced applying the centroid shift and the slope methods. For the 184.3 keV state in 165Dy, which is of special interest here, a half-life T1:2(184.3 keV)= 1.0 +0.1 ns has been determined ( Fig. 1) in accordance with the previous result TI~ 2 = 1.07 _+0.36ns (Ref. 5). Additionally, the half-life of the 180.9 keV level in 165Dy was observed to be T1:2~2.5 (_+l.0)ns in contradiction to the value of T1 ~=10.7ns given ill Reference 5. The relatively large experimental un-0340-2193/78/0289/0107/$01.00

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Electromagnetic transition probabilities in odd-mass erbium isotopes

Cited by 34 publications

References 18 publications

p-n Multiplets and band-like structures in106Ag

p-n Multiplets and band-like structures in106Ag

Discovery of isomers in dysprosium, holmium, and erbium isotopes withN=94to 97

Collective contributions to E1, ?K=1 matrix elements in odd-odd deformed nuclei

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