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1.
The energies and relative intensities of γ-rays following the β-decay of 78As (and 76As) to levels in 78Se (and 76Se) have been measured using an 8 cm3 Ge(Li) spectrometer. The β-decay of 78As has been measured using a superconducting magnet beta-ray spectrometer with two 3 mm thick Si(Li) detectors. These data plus β-γ and γ-γ coincidence results have been used to construct a level scheme with 18 excited levels in 78Se. The half-life of 78As was measured to be 90.7±0.2 min. 相似文献
2.
The γ-radiation following the decay of 112Ag has been studied with a Ge(Li) detector. A total of 76 γ-rays was observed. The γ-γ coincidence and angular correlation relations involving the 617 keV 2+-0+ transition have been measured using Ge(Li)-NaI(Tl) and NaI(Tl)-NaI(Tl) detectors. These results have been used to confirm spins and parities of some levels of 112Cd in the proposed decay scheme. Cross sections for 112Ag production by 115In(n,α) and 112Cd(n, p) reactions have been measured; the 112Ag half-life has been determined as 3.14 ± 0.02 h. 相似文献
3.
The γ-radiations following the decay of 112Ag have been studied with Ge(Li) detectors. The 112Ag half-life has been measured as 3.16±0.02 h; twenty gamma radiations ranging in energy from 606.7 keV to 2829.6 keV have been observed.
Gamma-gamma coincidence measurements have been performed with Ge(Li) and NaI(Tl) detectors. A decay scheme consistent with the present data is proposed. 相似文献
4.
The decay scheme of 138mPr has been studied using Ge(Li) detectors. Both single and coincidence γ-ray spectra were measured. A decay scheme is proposed incorporating most of the measured γ-rays. The log ft values of β-transitions suggest spin and parity 8− for 138mPr. The lifetime of the 2217.8 keV 5− state has been found to be less than 0.3 ns. 相似文献
5.
E. W. A. Lingeman F. W. N. De Boer P. Koldewijn P. R. Maurenzig 《Nuclear Physics A》1971,160(3):630-640
The radioactive decay of 79Rb(23.0±0.5 min) has been studied with the aid of semiconductor radiation detectors. Both singles and coincidence spectra have been recorded. The decay energy: 3520±45 keV was determined by measuring the endpoint of the positon spectrum in coincidence with prominent γ-rays. A decay scheme is proposed incorporating most of the measured γ-rays. The following energies in keV and parities of levels are assigned: ground state (
),
,
,
,
, 383.71±0.18, 532.82±0.33, 688.21±0.09,
, 934.0±1.4, 1089.4±0.4, 1474.7±0.3. The spin and parity of the 79Rb ground state is most probably
. 相似文献
6.
P. Aguer C.F. Liang J. Libert P. Paris A. Péghaire A. Charvet R. Duffait G. Marguier 《Nuclear Physics A》1975,249(2):239-252
The decay of 4 min 158Tm has been investigated with on-line mass-separated samples obtained from the Orsay ISOCELE separator. Measurements of γ-rays, conversion electron lines and γ-γ bi-dimensional coincidences were performed. About 180 transitions were ascribed to the decay and two thirds of them were placed in a decay scheme. The β-band and the γ-band were identified with bandheads situated at 806.40 and 820.13 keV respectively. In addition, a number of other vibrational bands (β-γ, β-β, Kπ = 0? and 1?) are proposed. The decay properties of those bands are discussed in the framework of current nuclear models. The log ft values suggest a 2? assignment for 158Tm with the possible configuration (p404J↓-n521↑). 相似文献
7.
The decays of 3.25 min 169Hf and 2.05 min 167Hf have been studied with high-resolution Ge(Li) and Si(Li) detectors. The total decay energy of 169Hf determined from our experimental ratio is 3.29+0.05?0.13 MeV. The allowed unhindered character of the main β-branches in the decay of both isotopes allows unique Nilsson model assignments. 相似文献
8.
In order to clear up important discrepancies amongst previous investigations, the decay of 168Lu, produced through the 169Tm (α, 5n) reaction, has been re-investigated. Instead of the well-known 7 min activity, evidence has been obtained for two distinct decays with half-lives of 5.5 min and 6.7 min. The corresponding Q-values have been determined to be respectively 4470±80 keV and 4690±100 keV. The decay schemes are given for each isomeric state. The assignments 6−(p404↓+n523↓) and 3+(p541↓+n523↓) are proposed for 168gLu (5.5 ruin) and 168mLu (6.7 min), respectively. The structure of the levels are discussed in the framework of current nuclear models. 相似文献
9.
H. Strusny H. Tyrroff E. Herrmann G. Musiol M.I. Baznat G. Beyer K.Ya. Gromov M. Honusek T.A. Islamov V.V. Kuznetsov H.-U. Siebert 《Nuclear Physics A》1975,242(1):30-44
The decay of 159Tm () has been investigated with Ge(Li) andSi(Li) detectors, B-spectrographs and a toroidal spectrometer using isotopically separated samples produced by the YASNAPP facility at Dubna. The singles γ-ray spectrum, the conversion electron spectrum, the positron spectrum, prompt and delayed γ-γ coincidences were measured. Using strong thulium activities, conversion electrons were also measured with high resolution b-spectrographs. In the 159Tm decay 81 new γ-ray transitions were observed. A decay scheme of 159Tm is proposed involving 12 excited states in 159Er. The first members of the rotational bands ?[521], ?[523], +[402 + 651], ?505 and ?[514] and the , and states of a strongly perturbed positive parity band were identified. The Q-value of 159Tm was determined to be 3.4±0.3 MeV. 相似文献
10.
Gamma rays emitted in the decay of the 133Te isomers, 55.4 min 133mTe and 12.5 min 133gTe, have been observed with Ge(Li) detectors. Sources were prepared by separating Sb from fission products, allowing several minutes for decay of 2.7 min 133Sb and then separating the Te daughter activities. A total of 29 γ-rays between 312 and 2541 keV were attributed to decay of 133gTe and 30 from 74 to 2050 keV to that of 133mTe. Gamma-gamma coincidences in the decay of 133gTe were observed with a NaI(Tl)---Ge(Li) set-up. The decay scheme of 133gTe was constructed, involving placement of 25 of the γ-rays emitted. The decay of 133gTe populates levels in 133I at 0, 312, 720, 787, 1313, 1333, 1374, 1565, 1718, 2137, 2194 and 2541 keV. The decay of 133mTe is very complicated, and we have not attempted construction of a complete decay scheme for it; however, levels at 913 and 1561 keV in 133I are definitely populated in 133mTe decay. The value for Qβ of 133Te was measured as 3.52±0.10 MeV. The low-lying levels of the odd-mass iodine isotopes vary smoothly through the series 125I through 133I. The levels of 133I are fitted rather well by predictions based on quasi-particle-phonon coupling. 相似文献
11.
I. Adam M. Honusek Z. Hons V.V. Kuznetsov T.M. Muminov R.R. Usmanov A. Budziak 《Nuclear Physics A》1981,356(1):129-145
The decay of 161Yb () has been investigated with Ge(Li) and Si(Li) detectors and a toroidal β-spectrometer. Isobarically separated samples produced by the YASNAPP facility at Dubna Institute were used. The singles γ-ray spectrum, the conversion electron spectrum, γ-γ-τ and e-γ coincidences have been measured. In all, 67 γ-ray transitions have been observed. A decay scheme for 161Yb is proposed involving 12 excited states in 161Tm. The +[404], ?[523] and +[402] levels have been identified. The interpretation of the high-lying levels is discussed. The Q-value of 161Yb decay has been determined to be 3850 ± 250 keV. The A-dependence of the energies of the one-quasiparticle states in odd-A Tm isotopes is demonstrated. 相似文献
12.
The decays of 48Sc and 48V have been studied with Ge(Li) diodes, scintillation spectrometers and a double focussing beta-ray spectrometer. The 3507 keV level, from which originates the quadruple cascade (9.4±0.5)% in the 48Sc decay, is also de-excited by a 1212 keV cross-over transition to the 2295 keV (4+) level and supports the assumption, that the 3507 keV level has a spin 6+. The first member of the reported triple cascade in the 48V decay is shown to be a doublet of 928.9±0.7 (1.2±0.2)% and 944.3±0.5 keV (8.0±0.5)% gamma rays, both followed by the 1311.4–983.3 keV cascade. Evidence was found, that the 2421 keV (2+) level is excited by weak gamma rays from high-energy levels. The K/β+ ration in the 48V decay is 0.69±0.05 The Q-values of 48Sc and 48V are calculated to be 3986±7 keV and if 4015±4 keV, respectively. The energy of the gamma ray of 47Sc, which is present as an impurity, is 159.2±0.5 keV. 相似文献
13.
The gamma-ray spectrum associated with the electron capture decay of 75Se has been studied with Ge(Li) spectrometers. Coincidence spectra were taken with a Ge(Li)---Ge(Li) combination. The data do not support a recent report of several new gamma rays in the decay of 75Se. Gamma-gamma angular correlation experiments were performed with a NaI(Tl)---Ge(Li) combination. The value obtained for δ(280 keV) is in excellent agreement with one recently reported value but in poor agreement with another. The ratio PK/Ptot for the electron capture branch to the 401 keV level of 75As has been determined, and the result agrees with previous experimental determinations. 相似文献
14.
J. Fechner A. Hammesfahr A. Kluge S. K. Sen H. Toschinski J. Voss P. Weigt
B. Martin
《Nuclear Physics A》1969,130(3):545-562In a study of the level scheme of 131Cs, we have measured the γ-γ and the ce-γ directional correlations of the 496-123.7 keV and 486-133.5 keV cascades. The linear polarization at φ=90° was measured for the 496-123.7 keV and 486-133.5 keV cascades. The L-subshell ratios for the 123.7 keV transition were determined. The g-factor of the 133.5 keV level and the half-lives of the 78.7, 123.7, 133.5 and 216 keV levels were re-investigated. The spin and parity assignments derived for the 620, 133.5 and 123.7 keV levels are
, respectively. The 620, 496, 486, 133.5 and 123.7 keV transitions are found to be of pure E2, pure M1, pure E2, (M1+(22±2)%E2) and pure E2 multipolarity, respectively. An upper limit of 192 ps for the half-life of the 216 keV level is obtained. The results are compared with theoretical estimates from the calculations of Kisslinger and Sorensen, of Freed and of Freed and Miles. 相似文献
15.
The disintegration characteristics of 164mHo and 164gHo have been studied using a high-resolution Ge(Li) spectrometer. Radioactive samples of 164mHo and 164gHo were obtained through the (n, 2n) reaction on spectroscopically pure holmium oxide with 14 MeV neutrons. The isomeric cross-section ratio for the yields of the ground and metastable states has been estimated to be 1.0±0.25. Gamma rays of 37.7 and 56.1 keV energy have been assigned to the decay of 164mHo and 73.4 and 91.5 keV γ-rays are attributed to the decay of 164gHo by electron capture and negaton emission, respectively. The branching ratio for the electron capture decay of 164gHo to the levels in 164Dy has been estimated accurately from the analysis of X-ray intensities. The results have been incorporated into a decay scheme. 相似文献
16.
Active yttrium was separated from 235U fission products and the decay of 94Y, 95Y and 96Y to the levels of 94Zr, 95Zr and 96Zr, respectively, has been studied with the aid of a 17 cm3 Ge(Li) detector. Gamma-ray energies and intensities were accurately determined. In the decay of 94Y four new transitions at 1232.78 ± 0.35, 1324.97 ± 0.35, 1363.48 ± 0.35 and 2467.00 ± 2.75 keV were observed. The data obtained support the level scheme proposed for 94Zr by Knight et al. and that deduced from more recent reaction data. Evidence supporting the location of the 0+ excited state at 1300 keV is presented. Branching ratios are calculated and a modified level scheme for 94Zr is proposed. In the decay of 95Y the energies of 13 γ-rays, previously identified with the decay of this nuclide, have been accurately measured and are presented in a partial level scheme for 95Zr. The data obtained in this work support the level structure deduced from reaction data by Cohen and Chubinsky and by other workers. New γ-transitions at 550.10 ± 0.23, 1723.30 ± 0.90 and 1805.0 ± 1.0 keV were measured in the decay of 96Y. 相似文献
17.
18.
H. W. Jongsma J. C. de Lange J. C. Boddendijk R. Kamermans H. Verheul 《Nuclear Physics A》1970,150(3):520-530
The single and coincident γ-ray spectra following the decay of the 62Co isomers were measured. New γ-transitions in the decay of the 13.5 min respectively 1.4 min isomer with energies: 0.7778, 0.8749, 1.1291, 1.7535, 2.3020 and 2.8826 MeV respectively 1.8863, 2.3458, 3.271 and 3.370 MeV have been observed. The intensity of the direct feeding from the 1.4 min isomer to the ground state of 62Ni was determined to be < 0.5 %. 相似文献