期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

1.

Electromagnetic transitions in some odd-proton deformed nuclei

K.D. Schilling L. Käubler F. Stary W. Andrejtscheff 《Nuclear Physics A》1976,265(1):58-76

In-beam measurements of nanosecond lifetimes applying the method of delayed γ-γ coincidences were performed in the (p, n) reaction. Analysing the time spectra with the centroid shift method, the following half-lives of excited nuclear states in the subnanosecond region could be found:

T_{12} (353.2 keV in^{161} Ho) = 0.52±0.15 ns

,

T_{12} (252.7 keV in^{161} Ho) ≦ 0.2 ns

,

T_{12} (579.4 keV in^{161} Ho) ≦ 0.2 ns

,

T_{12} (431.2 keV in^{163} Ho) = 0.37±0.15 ns

,

T_{12} (439.9 keV in^{163} Ho) = 0.35±0.15 ns

,

T_{12} (471.3 keV in^{163} Ho) ? 0.2 ns

,

T_{12} (612.8 keV in^{163} Ho) ? 0.3 ns

,

T_{12} (295.6 keV in^{171} Lu) = 0.85±0.20 ns

,

T_{12} (469.2 keV in^{171} Lu) ≦ 0.2 ns

,

T_{12} (357.0 keV in^{173} Lu) = 0.40±0.08 ns and T_{12} (449.0 keV in^{173} Lu) = 0.58±0.12 ns

. Following half-lives in ¹⁷³Lu have been remeasured:

T_{12} (425.3 keV) = 0.84±0.20 ns and T_{12} (434.9 keV) = 0.38±0.10 ns

. Absolute γ-ray transition probabilities are deduced and compared with Nilsson model predictions including pairing correlations. Coriolis mixing calculations are performed for K-allowed as well as for K-forbidden transitions. 相似文献

2.

Electromagnetic transitions in some doubly odd deformed nuclei

K.D. Schilling L. Käubler W. Andrejtscheff T.M. Muminov V.G. Kalinnikov N.Z. Marupov F.R. May W. Seidel 《Nuclear Physics A》1978,299(2):189-229

Nanosecond lifetimes of excited states in doubly odd deformed nuclei have been determined by in-beam measurements applying the method of delayed γ-γ coincidences as well as by experiments in the radioactive decay with the method of delayed γ-ce coincidences, respectively. Analysing the time distributions and delayed γ-ray spectra, the following half-lives of isomeric states could be obtained for the first time:

T_{12} (63.7 keV in^{160} Tb) = 60 ± 5 ns, T_{12} (138.7 keV in^{160} Tb) = 5.7 ± 0.5 ns, T_{12} (82.0 keV in^{156} Ho) = 1.25 ± 0.20 ns, T_{12} (87.2 keV in^{156} Ho) = 58.5 ± 3.5 ns, T_{12} (139.2 keV in^{158} Ho) = 1.85 ± 0.10 ns, T_{12} (38.3 keV in^{162} Ho) = 1.2 ± 0.2 ns, T_{12} (179.9 keV in^{162} Ho) = 8.7 ± 0.2 ns, T_{12} (342.8 keV in^{164} Ho) = 2.6 ± 0.2 ns, T_{12} (295.1 keV in^{166} Ho) = 1.10±0.15 ns, T_{12} (44.6 keV in^{162} Tm) = 1.40±0.15 ns, T_{12},(163.4 keV in^{162} Tm) = 1.1 ± 0.1 ns, T_{12} (220.1 keV in^{178} Ta) = 8.5 ± 1.0 ns, T_{12} (289.5 keV in^{178} Ta) = 2.0 ± 0.5 ns, T_{12} (392.8 keV in^{178} Ta) ≈ 1 ns, T_{12} (316.5 keV in^{186} Re) = 0.20 ± 0.10 ns, T_{12} (300.2 keV in^{188} Re) = 1.5 ± 0.2 ns and T_{12} (482.2 keV in^{188} Re) = 0.26 ± 0.10 ns

. Furthermore, upper limits for the half-lives of fifteen excited states in ¹⁶⁰Tb, ^{164, 166}Ho and ^{186, 188}Re have been estimated. For eight isomeric levels in ^{186, 188}Re, the lifetimes earlier determined have been remeasured. Unlike previous studies, the existence of isomeric states at 87.2 keV in ¹⁵⁶Ho and at 179.9 keV in ¹⁶²Ho is suggested. Absolute γ-ray transition probabilities are deduced and compared with single-particle estimates according to Weisskopf and Nilsson, the latter also including pairing correlations. The K-, Ω- and f-forbidden transitions can qualitatively be explained in terms of configuration mixings. Experimental El, ΔK= 1 transition matrix elements in odd-odd deformed nuclei are supposed to be appreciably influenced by higher-order vibrational admixtures coupled via RPC and p-n interaction mixings. 相似文献

3.

Two-quasiparticle excitations and collectivity in the weakly-deformed transitional isotopes ^{104, 106, 108}Cd

W. Andrejtscheff L.K. Kostov H. Rotter H. Prade F. Stary M. Senba N. Tsoupas Z.Z. Ding P. Raghavan 《Nuclear Physics A》1985,437(1):167-188

Using the generalized centroid-shift method on the Rutgers tandem, the following half-lives of ¹⁰⁶Cd excited states were measured in the reaction ⁹³Nb(¹⁶O, p2n):

T_{12} (3679.0 keV) = 0.7^{+0.1}_{?0.3} ns, T_{12} (3507.8 keV) = 1.2 ± 0.4 ns, T_{12} (3044.2 keV) = 0.4 ± 0.1 ns, and T_{12} (2330.7 keV) = 0.6 ± 0.2 ns

. With the same method applied on the Rossendorf cyclotron, the following half-lives were measured in the reactions

^{102, 106} Pd (α, 2 n): T_{12} (2902.0 keV) = 0.8^{+0.2}_{?0.1} ns (^{104} Cd)

as well as

T_{12} (3737.3 keV) = 0.2 ± 0.1 ns

,

T_{12} (3223.7 keV) = 0.2 ± 0.1 ns

,

T_{12} (3057.4 keV) = 0.10 ± 0.05 ns

,

T_{12} (2975.3 keV) = 0.15 ± 0.10 ns

,

T_{12} (3110.5 keV) = 0.3 ± 0.1 ns

, and

T_{12} (2565.2 keV) = 0.2 ± 0.1 ns (^{108} Cd)

. The results reveal the non-collective (two-quasiparticle) character of several states above 2.9 MeV in ^{104, 106, 108}Cd, in qualitative accordance with predictions of the slightly-deformed-rotor model. They concern completely aligned [h_$112$g_$72$] (9^??11^?-13^?, etc.) as well as semi-decoupled [h_$112$d_$52$] (6^?-8^?-10^?, etc.) two-quasineutron band structures. Further, the possible character of 8⁺ (two-quasiproton) excitations, 5⁺ (two-quasineutron) states and of other intrinsic excitations is discussed. The experimental findings present a challenge to current theories of transitional nuclei for a quantitative treatment of absolute γ-ray transition strengths. 相似文献

4.

Transition probabilities in the doubly odd nuclei ¹⁷⁶Lu and ¹⁸²Ta

W. Andrejtscheff P. Manfrass W. Seidel 《Nuclear Physics A》1974,226(1):142-156

The depopulation of isomeric states in ¹⁷⁶Lu and ¹⁸²Ta was studied in the (n, γ) reaction by means of delayed γ-γ coincidence measurements with NaI(Tl) and Ge(Li) detectors. The following half-lives, unknown so far, have been obtained for ¹⁷⁶Lu:

T_{12} (198.0 keV) = 35.0 ± 1.0 ns

,

T_{12} (638.8 keV) = 8.0±1.0 ns

and

T_{12} (662.1 keV) = 6.3±0.5 ns

; and for ¹⁸²Ta:

T_{12} (270.4 keV) = 1.2 ± 0.2 ns

,

T_{12} (402.6 keV) = 1.00 ± 0.05 ns

and

T_{12} (443.6 keV) = 2.2 ± 0.2 ns

. The existence of the isomeric level at 443.6 keV in ¹⁸²Ta was confirmed. Weisskopf hindrance factors have been deduced for the K- and Ω-forbidden transitions. The K-allowed transitions are considered in terms of the Nilsson model taking into account pairing correlations. The experimental results for the transitions de-exciting the 270.4 keV level in ¹⁸²Ta agree with earlier model predictions including band mixing effects. The influence of the pairing effect on K-allowed E1 transitions in doubly odd nuclei is demonstrated. 相似文献

5.

Some M1 transition strengths in odd-A nuclei away from closed shells

W. Andrejtscheff L.K. Kostov L.G. Kostova P. Petkov M. Senba N. Tsoupas Z.Z. Ding C. Tuniz 《Nuclear Physics A》1985,445(3):515-533

By the in-beam application of the generalized centroid shift method, nanosecond half-lives have been determined for the first time: in

^{101} Pd T_{12} (1337.4 keV) = 1.2^{+0.6}_{?0.3} ns and T_{12} (261.0 keV) = 0.7 ± 0.2 ns

using the reaction

(^{12} C,x n)

, in

^{71} As T_{12} (147.5 keV) = 0.85 ± 0.25 ns

using the reaction (¹⁶ O, αp), in

^{91} Nb T_{12} (5455.3 keV) = 1.2 ± 0.3 ns

using the reaction (¹⁶O,2np), in

^{103} Pd T_{12} (244.0 keV) < 0.2 ns

and in

^{91} Nb T_{12} (3110.2 keV) < 0.2 ns

using the reaction P(α, xn). Some known nanosecond isomers in different nuclei produced as by-products have also been detected. In the nuclei investigated far away from closed shells with complex wave functions, M1 transitions are considered which would be l-forbidden in the pure shell model. A retarded

Ml (+ E 2) 252^{+} → 232^{+}

transition in ⁹¹ Nb is considered as proceeding between possible multiparticle-hole configurations. 相似文献

6.

Magnetic moments of

J^{π} = 192^{−}

mirror states in ⁴³Ti and ⁴³Sc

O. Häusser T.K. Alexander T. Faestermann D. Horn D. Ward H.R. Andrews I.S. Towner 《Physics letters. [Part B]》1978,73(2):127-130

The time-differential perturbed angular distribution method was used to determine the g-factors of the

(f_{72})^{3} 192^{?}

states in ⁴³Ti and ⁴³Sc. The results for the mass 43 mirror pair are:

^{43} Ti : g = 0.760 ± 0.001, T_{12}, = 560 ± 6 ns

,

^{43} Sc : g = 0.3286± 0.0007, T_{12} = 473 ± 5 ns

. Considering in addition the magnetic moments in A = 41 and 42, it is suggested that the deformed states considered by Johnstone and Castel and by Erikson are responsible for the observed large deviations from the Schmidt values. 相似文献

7.

Lifetimes and g-factors of the 6− and 7− isomers in 66Ga and 68Ga

A. Filevich A. Ceballos M.A.J. Mariscotti P. Thieberger E. Der Mateosian 《Nuclear Physics A》1978,295(3):513-524

The 6^? and 7^? isomeric states in ⁶⁶Ga and ⁶⁸Ga at 1440.9 and 1229.6 keV, respectively, have been populated with the (¹³C, 2np) and (¹⁵N, n2p) reactions on natural Fe. The half-lives of these states have been measured to be

T_{12} (6^{?},^{66} Ga) = 57.3 ± 1.2 ns

and

T_{12} (7^{?},^{68} Ga) = 64 ± 2 ns

. Using previous data on the hyperfine field of Ga in Fe, the g-factors of these states have been determined by means of the TDPAD method. The results are

g(6^{?},^{66} Ga) = 0.129 ± 0.003

and

g(7^{?},^{68} Ga) = 0.105 ± 0.003

. These values are in very good agreement with the independent particle model if one assumes the

{π f_{52}, ν g_{92}}_{6^{?},7^{?}}

and

{π p_{32}, ν g_{92}}_{6^{?}}

configurations and uses the empirical proton and neutron g-factors from odd-A neighboring nuclei instead of the Schmidt values. The large disagreements with experiment when Schmidt values are used show that core polarization effects are important in these nuclei. 相似文献

8.

Absolute E1, ΔK = 1 transition probabilities between multi-quasiparticle high-spin states in ¹⁷⁶Hf and ¹⁷⁸Hf

L.K. Kostov H. Rotter C. Heiser H. Prade F. Stary W. Andrejtscheff 《Nuclear Physics A》1982,376(3):451-462

Applying the generalized centroid shift method in (α, 2n) reactions, the half-lives of the 3080 keV 15⁺ state in ¹⁷⁶Hf and of the 1637 keV 5^? state in ¹⁷⁸Hf have been measured as

T_{12} = 0.20^{+0.12}_{?0.08} ns

and

T_{12} = 0.40 ± 0.10 ns

, respectively. B(El) values of K-allowed E1 transitions

n 92^{+} [624]→ 72^{?} [514]

are derived, and together with other data on similar transitions in odd-A nuclei, compared with predictions of the Nilsson plus pairing model. In ¹⁷⁶Hf, the 15⁺ and 14^? states at 3080 and 2866 keV, respectively, appear as quite pure deformed 4QP configurations. In the 2QP state at 1637 keV in ¹⁷⁸Hf, possible strong mixing of vibrational components is discussed coupled via 2QP K-admixtures arising from the partial alignment of the

i_{132}

neutron. 相似文献

9.

Nuclear orientation study of the excited states of ¹²⁹I populated in the decay of ^129gTe and ^129mTe

R.E. Silverans E. Schoeters L. Vanneste 《Nuclear Physics A》1973,204(3):625-635

From the angular distributions of γ-rays emitted by oriented ^129gTe and ^129mTe nuclei implanted in iron by isotope separator, unique spin assignments could be made for the excited states of ¹²⁹I at 487.4 keV

(52^{+})

, 696.0 keV

(112^{+})

, 729.6 keV

(92^{+})

, 768.9 keV

(72^{+})

, 1050.4 keV

(72^{+})

and 1111.8 keV

(52^{+})

. In addition, E2/M1 amplitude ratios for the following ¹²⁹I γ-rays (energies are in keV) are derived: δ(459.6) = ?(0.076^+0.037_?0.148); δ(487.4) = 0.50^+0.17_?0.10 or δ^? = 0.35^+0.15_?0.09; δ(556.7) = 0.06±0.02 or δ^? = ?(0.10±0.02); δ(624.4) = 0.10±0.26 or δ^? > 0.4; the 696.0 keV γ-ray is pure E2; δ(729.6) = ?(0.34±0.06) or δ^?1 = 0.55±0.05; δ(741.1) = ?(0.27±0.10) or δ^?1 = ?(0.43±0.12); δ(817.2) = 0.46±0.04 or δ^?1 =0.20±0.03 if

I^{π} (845 keV) = 72^{+}

; δ(1022.6) = ?(0.02 ±0.02) or δ^?1 = ?(0.23±0.02);

δ(1084) = 0.56^{+0.04}_{?0.14}

; δ(1111.8) = 0.06±0.05 or δ^?1 = ?(0.08±0.05). The anisotropy of the 531.8 keV γ-ray excludes

12^{+}

as a possible spin assignment for the 559.6 keV level, so that no

12^{+}

level is fed in the decay from ¹²⁹Te. Anisotropies for the 209, 250.7, 278.4 and 281.1 keV γ-rays are also measured. Comparison of the level scheme is made with theoretical predictions from both the pairing-plus-quadrupole model and the intermediate coupling unified model. 相似文献

10.

Measurement of the nuclear magnetic dipole moments of ¹⁷⁷Hf and ¹⁷⁹Hf with the atomic beam magnetic resonance method

S. Büttgenbach M. Herschel G. Meisel E. Schrödl W. Witte 《Physics letters. [Part B]》1973,43(6):479-480

The nuclear ground-state magnetic dipole moments of ¹⁷⁷Hf and ¹⁷⁹Hf have been determined with the atomic beam magnetic resonance method. The results are:

μ_{I} (^{177} Hf = 0.7836(6)μ_{N}, μ_{I} (^{179} Hf) = ?0.6329(13) μ_{N}

(uncorrected for diamagnetic shielding). 相似文献

11.

Isomeric E1 and M1 transitions in ¹⁷⁷Ta and in neighbouring odd-A Lu and Ta isotopes

K.D. Schilling W. Andrejtscheff F. Dubbers P. Manfrass 《Nuclear Physics A》1973,208(2):417-428

Delayed γ-ray spectra as well as time distributions have been measured applying the r.f.-γ method and the method of delayed γ-γ coincidences. Using the reaction ¹⁷⁵Lu(α, 2n)¹⁷⁷Ta, the half-lives of the levels at 70.6 and 73.6 keV in ¹⁷⁷Ta have been determined as

T_{12} = 80±10 ns

and

T_{12} = 370±50 ns

, respectively. In further experiments, upper limits for the lifetimes of the

92^{?} [514]

and

52^{+} [402]

states in ¹⁷¹Lu and ¹⁷³Lu were estimated. Comparisons of the experimental half-lives to Weisskopf and Nilsson model predictions are performed taking into account pairing correlations. For the calculations, a modified Nilsson Hamiltonian has been used. The hindrance factors obtained are summarized together with those deduced for corresponding transitions in neighbouring odd-proton nuclei. From the experimental results in ¹⁷⁷Ta, conclusions have been drawn on the possible value of the constant k₂ occurring in the magnetic dipole operator. 相似文献

12.

Negative-parity states in Pb isotopes: g-factor of the 480 ns,if Jπ = 9⁻ isomer in ²⁰⁰Pb

R. Lutter O. Häusser D.J. Donahue R.L. Hershberger F. Riess H. Bohn T. Faestermann F.v. Feilitzsch K.E.G. Löbner 《Nuclear Physics A》1974,229(2):230-240

The g-factor of the 480 ns, 9^? isomer at 2.237 MeV in ²⁰⁰Pb was measured by the time-differential perturbed angular distribution method. The result, g = ?0.0285±0.0011 confirms the rather pure

(f_{52}^{?1} i_{132}^{?1})

quasiparticle structure of this state. Half-lives of 480±20 ns, 43±3 ns and 42±4 ns have been measured for the 2237 keV 9^?, 2154 keV 7^? states in ²⁰⁰Pb and the 2208 keV state in ²⁰²Pb, respectively; E2 transitions and g-factors of negative-parity states in even, neutron-deficient Pb isotopes are discussed. 相似文献

13.

Half-life measurements of excited levels in ¹²²I

D. Lode F. Münnich Å. Höglund S.G. Malmskog 《Nuclear Physics A》1973,209(1):170-180

The half-lives of three low-lying levels in ¹²²I have been measured using delayed coincidence techniques. The following results were obtained:

T_{12} (61.8 keV) = 7.4 ± 0.5 ns, T_{12} (90.7 keV) = 1.9 ± 0.3 ns and T_{12} (148.8 keV) ≦ 80 ps

. All transitions depopulating these levels are mainly of M1 multipolarity; they are hindered with factors up to 295 as compared to the single particle estimates. 相似文献

14.

Beta decay studies in the vicinity of ¹³²₅₀Sn₈₂: Excited states in ¹³⁰₅₁Sb, ¹³⁰₅₂Te and ¹³²₅₂Te

A. Kerek P. Carlé S. Borg 《Nuclear Physics A》1974,224(2):367-395

Using the OSIRIS on-line isotope separator facility, the decays of ¹³⁰Sn and ^{130, 132}Sb have been studied. On the basis of singles γ and γ-γ coincidence Ge(Li) spectra and conversion electron Si(Li) measurements, level schemes for ¹³⁰Sb, ¹³⁰Te and ¹³²Te have been constructed. The corresponding half-lives have been measured using multiscaling technique. The 3.8 min ground state of ¹³⁰Sn populates only positive parity states in the πν^?3 nucleus ¹³⁰Sb: the energetically lowest 5⁺ state with the

(π1 g_{72}, ν2 d_{32})

configuration assignment; the

T_{12} = 3.6 ± 0.3 ns 4^{+}

state at 70.0 keV; the 2⁺ state at 262.5 keV; the (0, 1)⁺ state at 697.2 keV; the 3⁺ state at 813.1 keV and the 1⁺ state at 1042.3 keV excitation energy. A 1.7 min isomeric state in ¹³⁰Sn, with the tentative spin assignment (7^?), populates several odd parity levels in ¹³⁰Sb. These arise from the

(π1 g_{72}, ν1 h_{112}^{-1})

and/or

(π2 d_{52}, ν1 h_{112}^{-1})

configurations and are located 84.7 keV (6^?), 144.9 keV (7^?), 688.5 keV and 1044.0 keV above the 40 min 8^? β- decaying state. No transitions between odd and even parity states have been observed.The most important excited states in ¹³⁰Te found in the β^? decay of the 6.6 min ¹³⁰Sb 5⁺ state are: 839.4 keV, 2⁺; 1632.8 keV, 4⁺; 1815.1 keV, 6⁺; 2100.8 keV, 5^?.Levels in the π²ν^?2 nucleus ¹³²Te were observed in the β^? decays of the 2.8 min ¹³²Sb (4⁺) and the 4.2 min ¹³²Sb (8^?) states. Unique spin and parity assignments have been given to the following states: 973.9 keV, 2⁺; 1670.7 keV, 4⁺; 1774.1 keV, 6⁺; 1924.7 keV, 7^?; 2053.0 keV, 5^?. 相似文献

15.

Lifetime and g-factor results for the

132^{−}

1985 keV level in ⁹¹Nb and the

152^{−}

2288 keV level in ⁹¹Zr

C.V.K. Baba D.B. Fossan T. Faestermann F. Feilitzsch M.R. Maier P. Raghavan R.S. Raghavan C. Signorini 《Nuclear Physics A》1976,257(1):135-143

Lifetime and g-factor measurements have been made with pulsed beam-γ time-differential techniques using the ⁸⁹Y(α, 2n)⁹¹Nb and ⁸⁸Sr(α, n)⁹¹Zr reactions. A mean lifetime τ = 14.4 ± 0.5 nsec and a g-factor of 1.26 ± 0.04 were obtained for the

132^{?}

1985 keV level in ⁹¹Nb and τ = 41.9 ± 1.2 nsec and g = 0.70 ± 0.01 were obtained for the

152^{?}

2288 keV level in ⁹¹Zr. These results are compared to theoretical calculations for

(π g_{92})^{2} (π p_{12})

and

(π g_{92})(π p 12)(v d_{52})

configurations in ⁹¹Nb and ⁹¹Zr, respectively. 相似文献

16.

Radiative lifetimes in MoI using a novel atomic beam source

D.W. Duquette S. Salih J.E. Lawler 《Physics letters. A》1981,83(5):214-216

Radiative lifetimes of the 4d⁵ (a⁶S)5pz ⁷P^o levels and the 4d⁵ (a⁶S)5pz⁵P^o levels in MoI are reported as follows:

τ(z^{7} P_{4}^{O}) = 15.9 ns

,

τ(z^{7} P_{3}^{O}) = 17.0 ns

,

τ(z^{7} P_{2}^{O}) = 17.1 ns

,

τ(z^{5} P_{3}^{O}) = 22.3 ns

,

τ(z^{5} P_{2}^{O}) = 22.1 ns

, and

τ(z^{5} P_{1}^{O}) = 21.7 ns

(±5%). The lifetimes are measured using time resolved laser induced fluorescence and a novel atomic beam source. This novel hollow cathode effusive beam source produces an intense beam of ground state Mo atoms and metastable Mo atoms. Our measurements on the z ⁷P^O levels are in agreement with earlier lifetime measurements. Our measurements on the z ⁵P^O levels are the first direct radiative lifetime measurements of these levels; the z ⁵P^O measurements are of particular interest because the a⁵S → z⁵P^O multiplet is used to determine the solar abundance of Mo. 相似文献

17.

A Mössbauer study of amorphous Fe₄₀Ni₄₀B₂₀

Anil K. Bhatnagar B. Bhanu Prasad N. Ravi R. Jagannathan T.R. Anantharaman 《Solid State Communications》1982,44(6):905-909

Amorphous Fe₄₀Ni₄₀B₂₀ (VITROVAC 0040) alloy has been investigated using ⁵⁷Fe Mössbauer Spectroscopy. The Curie temperature T_c is found to be well defined and is 695 ± 1 K. The quadrupole splitting just above T_c is 0.64 mm sec^?1. The crystallization temperature is 698 ± 2 K, close to but definitely above T_c. The average hyperfine field H_eff(T) of the glassy state shows a temperature dependence of

H_{eff} (0)[1 ? B_{32} (T/T_{c})^{32} ? C_{52} (T/T_{c})^{52} ? …]

indicative of the existence of spin wave excitations. The values of

B_{32}

and

C_{52}

are found to be 0.40 and 0.06, respectively, for T/T_c ? 0.72. At temperatures close to T_c, H_eff(T) varies as (1 ? T/T_c)^β where β is one of the critical exponents and its value is found to be 0.29 ± 0.02. 相似文献

18.

Decay of the mirror nuclide ⁴⁵V

P. Hornshøj J. Kolind N. Rud 《Physics letters. [Part B]》1982,116(1):4-6

The β⁺ decay of ⁴⁵V

(J^{π}, T= 72^{?}, 12)

has been observed. The half-life was found to be 539 ± 18 ms; in addition to the superallowed transition to the mirror state (⁴⁵Ti ground state), it exhibits a (4.3 ± 1.5)% allowed branch to the

52^{?}

state at 40.1 keV in ⁴⁵Ti. Decay data for the complete

f_{72}

shell series of mirror nuclei are presented. 相似文献

19.

The measurement of the rotational relaxation times of OCS from the nutation signals

Keiichi Tanaka Eizi Hirota 《Journal of Molecular Spectroscopy》1976,59(2):286-298

The time dependence of microwave absorption was measured for the J = 2-1 and J = 3-2 transitions of OCS under on- and off-resonant conditions utilizing Stark and source modulation, respectively. The two effective pressure parameters obtained under the two conditions, which correspond to

(T_{2}^{?1} + T_{1}^{?1}) 4πP

and

(2πT_{2} P)^{?1}

, respectively, according to the Bloch equation, are different beyond experimental error; the difference

(T_{2}^{?1} ? T_{1}^{?1}) 2πP

is 0.94 ± 0.38 (2.5σ) MHz/Torr for J = 2?1. This difference was also determined to be 1.19 ± 0.30 MHz/Torr from the dependence of the nutation frequency on the microwave power. 相似文献

20.

Coupling constants for several light nuclei from a dispersion analysis of nucleon and deuteron scattering amplitudes

M.P. Bornand G.R. Plattner R.D. Viollier K. Alder 《Nuclear Physics A》1978,294(3):492-512

A forward dispersion relation cannot be applied to charged particle scattering amplitudes unless the influence of the Coulomb interaction is explicitly considered. Earlier studies have shown how Coulomb effects can be taken into account when direct (s-channel or bound-state) poles are investigated. In this paper we extend the Coulomb modification to include I = 0 exchange (u-channel) processes as well. We then apply a forward dispersion relation to empirical d + α, p + d and n + d elastic scattering amplitudes which contain both direct and exchange poles with and without Coulomb effects. We obtain detailed and model-independent information on the following vertices: ⁶Li-α-d (S- and D-state) ⁴He-d-d, ³He-d-p, ³H-d-n and d-p-n. From the coupling constants we calculate the asymptotic normalization (spectroscopic factors) C²₁ of the corresponding cluster wave functions, which become:

C^{2}_{0} (^{6} Li, α d) = 4.62 ± 0.23

,

C^{2}_{2} (^{6} Li, α d) = (1 ± 6) × 10^{?4}

, C²₀(α, dd) < 2,

C^{2}_{0} (^{3} He, dp) = 3.5 ± 0.4

,

C^{2}_{0} (^{3} H, dn) = 2.6 ± 0.3 and C^{2}_{0} (d, np) = 1.66 ± 0.1

. 相似文献