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1.

S. Cochavi S. Gilad M.A. Moinester J. Alster M. Buenerd P. Martin 《Nuclear Physics A》1974,233(1):73-80

The ⁹¹Zr(d, ³He) reaction was studied at a deuteron energy of 28 MeV. Angular distributions were measured from 13° to 47°; l_p values were extracted for the prominent lines of ⁹⁰Y. The l_p values and transition strengths were determined by DWBA analysis. The angular distributions for the

(π p_{12})(ν d_{52})

doublet (g.s. and 0.20 MeV state) exhibit the characteristic l = 1 shape. States at 1.42, 1.57, 1.64 and 1.81 MeV were also populated strongly in the (d, ³He) reaction; the 1.42, 1.57 and 1.81 MeV levels contain l= 1 transition strength and are most likely members of the

(π p_{32}^{?1})(ν d_{52})

multiplet. The 2.03 MeV state has a characteristic l = 3 angular distribution and is suggested to be the only member of the

(π f_{32}^{?1})(ν d_{52})

sextet to be unambiguously observed in this study, most probably the 5^? or 4^? member. The members of the

(π g_{52})(ν d_{92})

sextet were populated weakly (less than 100 μb/sr) in this reaction. 相似文献

2.

Study of the ^92,96Zr(d, α)^90,94Y reactions

S. Gilad S. Cochavi M.A. Moinester J. Alster M. Buenerd P. Martin 《Nuclear Physics A》1974,233(1):81-90

The hole-hole structure of ⁹⁴Y was studied via the reaction ⁹⁶Zr(d, α)⁹⁴Y and compared to the particle-hole structure of ⁹⁰Y, which was populated by the reaction ⁹²Zr(d, α)⁹⁰Y. The deuteron beam energy was 28 MeV. Angular distributions of both reactions were obtained for the prominent lines. New states of ⁹⁴Y were observed at 0.44, 1.17, 1.39, 1.53, 1.82, 1.90, 2.17, 2.33, 2.46 and 2.77 MeV. Our data are consistent with the previously reported 2^? assignment of the ground state, and we suggest J^π = 3^? for the 0.44 MeV state, these being members of the

(π2 p_{12}, ν2 d_{32}^{?1})

doublet. The 1.17 state is suggested to be a member of the

(πp_{32}^{?1}, ν d_{52}^{?1})

multiplet. The Q-value of the ⁹⁶Zr(d, α)⁹⁴Y reaction was measured to be 7.609 ± 0.020 MeV. The reaction ⁹⁴Zr(d, α) was performed at two angles. Several new states of ⁹²Y were observed at 0.31, 0.78, 1.03, 1.31, 1.49, 1.69 and 1.89 MeV. 相似文献

3.

Study of low-lying states in ⁹²Tc with the ⁹²Mo(³He,t) reaction

S.I. Hayakawa S.K. Mark J.K. Lee J.E. Kitching G.C. Ball W.G. Davies 《Nuclear Physics A》1973,199(3):560-570

States in ⁹²Tc have been studied by means of the ⁹²Mo(³He, t) reaction at 27.5 MeV. The Q-value for this reaction and the excitation energy of the isobaric ground state analogue of ⁹²Mo were determined to be ?7.882 ± 0.030 MeV and 3.813 ± 0.030 MeV respectively. Strongly populated levels in ⁹²Tc appear to belong to configurations arising from the

(1g_{92})_{π} (1g_{92})_{ν}^{?1}

multiplet. 相似文献

4.

Low-lying levels of ¹⁴⁰Pr

S.G. Hussein N.E. Sanderson R.G. Summers-Gill 《Nuclear Physics A》1974,219(2):407-421

The doubly odd nucleus ¹⁴⁰Pr has been investigated by means of the ¹⁴¹Pr(d, t)¹⁴⁰Pr and ¹⁴⁰Ce(p, nγ)¹⁴⁰Pr reactions. Twenty-eight levels, up to 1300 keV excitation, were observed in the pickup study. DWBA analysis was used to determine l-values and spectroscopic factors for all but a few which are very weakly populated. Gamma-ray angular distributions, measured at E_p = 4.78 MeV for the five strongest γ-rays, show appreciable nuclear alignment and demonstrate the feasibility of such experiments in this mass region. Taken together, the two studies have permitted the identification of the 12 levels expected from the low-lying (

π2 d_{52} ν2 d_{32}^{?1}

), (

π2 d_{52} ν3 s_{12}^{?1}

), (

π1 g_{72} ν2 d_{32}^{?1}

) and (π1g_$72$ν3s_$12$^?1) configurations. Tenta assignments for the strong odd-parity states are suggested on the basis of their spectroscopic factors. 相似文献

5.

Low-lying levels of ⁹²Nb from the ⁹²Zr(³He,t) and ⁹²Zr(³He,p2nγ) reactions

M.A. Rumore C.A. Fields J.J. Kraushaar 《Nuclear Physics A》1985,445(3):408-418

The structure of ⁹²Nb has been investigated using the 33.8 MeV ⁹²Zr(³He, t) and (³He, p2nγ) reactions. Several previously unobserved levels, including several belonging to the

π(g_{92})ν(g_{92})^{?1}

multiplet, are reported. The results are discussed in terms of the shell model. 相似文献

6.

Magnetic moment of the 2⁻ state in ⁹²Nb

W. Leitz E. Recknagel R. Sielemann Th. Wichert 《Nuclear Physics A》1974,221(2):319-324

The g-factor of the

[π(2 p_{12})^{1} v(2 d_{52})^{1}]_{2} ?

state in⁹²Nb(τ = 6.2 μsec) was determined by means of perturbed angular distribution methods using the ⁹²Zr(p, n)⁹²Nb reaction in a liquid alloy. The extracted

v(d_{52})

magnetic moment is discussed in terms of the core-polarization effect. 相似文献

7.

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

8.

Neutron-proton shell model multiplets in ⁸⁸Y and ⁹⁰Y from a study of the (α, nγ) reaction

H.W. Baer R.L. Bunting J.E. Glenn J.J. Kraushaar 《Nuclear Physics A》1974,218(2):355-371

The non-selective nature of the (α, nγ) reaction has been used to complement information from charged-particle reactions on the level structure of ⁸⁸Y and ⁹⁰Y. The γ-ray spectra were recorded with a 25 cm³ Ge(Li) detector at 90° to the beam using primarily targets of ⁸⁵Rb₂CO₃ and ⁸⁷Rb₂CO₃ and α-particle energies of 11.8, 12.2 and 13.0 MeV. The resulting transitions were accommodated in level schemes that involved primarily the following shell model configurations:

(π p_{12})^{1} (ν g_{92})^{?1}

,

(π g_{92})^{?1} (ν g_{92})^{1}

,

(π p_{12})^{1} (ν p_{12})^{?1}

,

(π f_{52})^{?1} (ν g_{92})^{?1}

in ⁸⁸Y and

(π p_{12})^{1} (ν d_{52})^{1}

,

π g (_{92})^{1} (ν d_{52})^{1}

,

(π p_{12})^{1} (ν s_{12)})^{1}

in ⁹⁰Y. 相似文献

9.

Experimental and shell-model studies of the reactions ⁹¹Zr(d,p)⁹²Zr and ⁹⁰Zr(t,p)⁹²Zr

S.S. Ipson K.C. McLean W. Booth J.G.B. Haigh R.N. Glover 《Nuclear Physics A》1975,253(1):189-215

The results of high-resolution studies of the ⁹¹Zr(d, p) reaction at E_d = 12 MeV and the ⁹⁰Zr(t, p) reaction at E_t = 11.85 MeV are presented. Absolute cross sections have been measured for both reactions and (d, p) spectroscopic factors determined. A comparison of these results with earlier data has been made, and although many of the previous assignments have been confirmed, many new features concerning the structure of ⁹²Zr have been discovered. Shell-model calculations have been performed for ⁹¹Zr and ⁹²Zr using a neutron space which includes the

2 d_{52}

,

3 s_{12}

,

2 d_{32}

,

1 g_{72}

and

1 h_{112}

orbits and a proton space comprising the

1 g_{92}

and

2 p_{12}

orbits. Realistic proton-neutron and neutron-neutron interactions based on the Sussex matrix elements were used in the calculations. Spectroscopic factors have been calculated for the ⁹⁰Zr(d, p) and ⁹¹Zr(d, p) reactions and cross sections calculated for the ⁹⁰Zr(t, p) reaction. In general, good agreement between the theoretical and the experimental results has been obtained. 相似文献

10.

The reaction ⁵⁵Mn(

d

, t)⁵⁴Mn

J.A. Cameron E. Habib A.A. Pilt R. Schubank V. Janzen 《Nuclear Physics A》1981,365(1):113-126

Neutron pick-up cross sections and vector analyzing powers have been measured for the reaction ⁵⁵Mn(

d

, t)⁵⁴Mn at 17 MeV. The mixture of

p_{12}

to

p_{32}

transfer to the low-lying l_n = 1 states has been found. Evidence of the

f_{72}

hole nature of several strong l_n = 3 states above 1 MeV has been obtained. 相似文献

11.

A high-spin isomer in ²⁰⁴Bi

Yu.N. Rakivnenko A.P. Klyucharev V.A. Lutsik E.A. Skakun I.A. Romaniy K.-H. Kaun W. Neubert W. Schulze F. Stary L.K. Peker E.I. Volmyanski 《Physics letters. [Part B]》1973,44(5):462-464

By making use of heavy-ion and α-particle induced reactions an isomeric state has been found in ²⁰⁴Bi, with a half-life of

T_{12} = 1.07 ± 0.03 ms

and the quantum characteristics I^π = 16⁺. The four-quasiparticle configuration

ν(i_{132})^{?2} ν(f_{52})^{1} π(h_{92})^{1}

has been ascribed to this state. 相似文献

12.

Proton spectroscopy of ⁹⁶Tc from the (³He,d) reaction

R.A. Emigh J.J. Kraushaar S. Shastry 《Nuclear Physics A》1979,320(2):335-352

Energy levels of the even-mass odd nucleus ⁹⁶Tc have been populated with the ⁹⁵Mo(³He, d)⁹⁶Tc reaction at a bombarding energy of 33.6 MeV and with 28 keV resolution (FWHM). Thirty levels were observed below 2.10 MeV excitation. Comparison of experimental angular distributions with DWBA calculations allowed l-value assignments and the extraction of spectroscopic factors for most levels. Over eighty-five percent of the observed spectroscopic strength is located in the lowlying

π1 g_{92} - v 2 d_{52}

configuration multiplet. A simple residual interaction shell model calculation reproduces the observed low-lying positive parity multiplet relatively well although the experimental spectrum indicates much configuration mixing is present. 相似文献

13.

Level structure of ¹⁰⁰Tc

J.A. Pinston W. Mampe R. Roussille K. Schreckenbach D. Heck H.G. Börner H.R. Koch S. Andre D. Barneoud 《Nuclear Physics A》1979,321(1):25-44

Gamma and electron spectra following thermal neutron capture on ⁹⁹Tc have been studied with a bent-crystal spectrometer, Ge(Li) and Si(Li) detectors and a magnetic spectrometer. Prompt and delayed γ-γ coincidences with Ge(Li) detectors have been performed. A level scheme is proposed for ¹⁰⁰Tc comprising 21 excited states up to 640 keV. The binding energy of the last neutron in ¹⁰⁰Tc was deduced. For most levels, spin and parity values were assigned. Two isometric transitions of respective half-lives 10.2 and 4.6 μs have been identified using the ¹⁰⁰Mo(d, 2n)¹⁰⁰Tc reaction with a pulsed beam of deuterons. From the comparison of the present (n, γ) study and the collaborative study of the ⁹⁹Tc(d, p) reaction, several members of the multiplets

π g_{92} ν g_{72}

,

π g_{92} ν g_{52}

,

π g_{92} ν s_{12}

and

π p_{12} ν d_{52}

have been identified. 相似文献

14.

Particle-hole multiplets in ⁴⁰Ca observed in the ⁴¹Ca(τ, α) reaction

D. Cline M.J.A. De Voigt P.B. Vold Ole Hansen O. Nathan D. Sinclair 《Nuclear Physics A》1974,233(1):91-104

Energy levels in ⁴⁰Ca up to 10.2 MeV have been studied in the neutron pickup reaction ⁴¹Ca(τ, α)⁴⁰Ca with 20 MeV bombarding energy. Thirty excited states have been identified and angular distributions have been measured in the interval from 5° to 40° by means of a split-pole magnetic spectrometer. The angular distributions together with DW calculations have been used to extract l_n values and spectroscopic factors. The l_n = 2 strength distribution for the

f_{72} d_{32}^{?1}

particle-hole levels is compared to the l_p = 3 strength distribution from pr stripping data. 相似文献

15.

In-beam study of the odd-odd nuclei ¹³⁴La and ¹³⁶La

T. Morek H. Beuscher B. Bochev T. Kutsarova R.M. Lieder M. Müller-Veggian A. Neskakis 《Nuclear Physics A》1985,433(2):159-180

The level schemes of the nuclei ^134,136La have been studied by means of in-beam γ-ray spectroscopic methods following the (α, 3n) and (p, 3n) reactions. New isomers with half-lives of 29 ± 5 μs and 17 ± 4 ns have been discovered in ¹³⁴La and ¹³⁶La, respectively. Low-lying levels and isomers in ^134,136La have been interpreted as members of multiplets having

(π d_{52} v d_{32}), (π d_{52} v s^{?1}_{12}) and (π d_{52} v h^{?1}_{112})

configurations. 相似文献

16.

Study of the ⁵⁸Ni(τ, α)⁵⁷Ni reaction at 25 MeV

S. Fortier S. Galès 《Nuclear Physics A》1979,321(1):137-156

The ⁵⁸Ni(τ, α)⁵⁷Ni reaction has been studied at 25 MeV incident energy. Angular distributions have been measured from 5° to 50° with a split-pole spectrometer up to 13.5 MeV excitation energy. A local zero-range DWBA analysis has been carried out, allowing l-assignments for about eighty levels, most of them previously unknown. An isospin-dependent potential has been used in the calculation of the neutron form factor for both T_<and T_> states, and the C²S values deduced using this procedure are compared to those obtained with the usual separation energy method. Analog states of eleven ⁵⁷Co levels have been identified and the eventuality for isospin mixing in ⁵⁷Ni has been discussed. A sum rule analysis has been carried out and energy centroids of hole states have been determined. About 60% of the

1 d_{52} and 2 s_{12} T_{<}

strengths and the full

1 d_{32}

and

1 f_{72}

hole strengths are observed. It is shown that the two excess neutrons in the ⁵⁸Ni ground state mainly populate the

2 p_{32}, 1 f_{52} and 2 p_{12}

orbitals, whereas the occupancy number of the

1 g_{92}

subshell is found to be smaller than 0.1%. Some non-pickup angular distributions have also been observed and a CRC analysis assuming two-step processes in the (τ, α) reaction and weak-coupling wave functions for final states has been attempted. Assignments of J^π values are proposed for four ⁵⁷Ni levels, based on this analysis. 相似文献

17.

Neutron correlations in the ⁴¹K ground state and T = 1 2p-2h states in ⁴⁰K

M.E. Williams T.H. Kruse P. Goode F.T. Baker J.L. Matthews W. Savin 《Nuclear Physics A》1973,213(2):317-331

Differential cross sections have been measured for ⁴¹(d, t)⁴⁰K and ⁴¹K(p, d)⁴⁰K at 15 MeV using a magnetic spectrograph with electronic detection by proportional-counter-scintillator telescopes or semiconductor detectors. Knowledge of the structure of the ⁴⁰K multiplets (

ν f_{72}, π d_{32}^{?1}

) and (

ν p_{32}, π d_{32}^{?1}

) permits the determination of amplitudes and relative phases for various configurations and neutron correlations in the ⁴¹K ground state. Spectroscopic factors for neutron pick-up to states in ⁴⁰K are strongly influenced by the interference of transition amplitudes. In the (d, t) reaction T= 1, 2p-2h states are also observed. 相似文献

18.

Energy dependence of the reaction mechanism of ¹¹B induced single nucleon transfers on ²⁶Mg

I. Paschopoulos D. Sinclair 《Nuclear Physics A》1977,277(2):358-364

Angular distributions for elastic scattering and for single nucléon stripping reactions induced by a 31 MeV ¹¹B beam on ²⁶Mg have been measured. The DWBA calculations provide a good account of the shape and magnitude of the proton transfer data and of the neutron transition to the

j- favoured d_{32}

level in ²⁷Mg, but fail to reproduce the features of the

s_{12}

and

d_{52}

transitions to ²⁷Mg. The j-dependent effects and l-matching conditions are investigated as a function of beam energy and their role in determining the reaction mechanism is examined. 相似文献

19.

¹²C(⁷Li,t)¹⁶O and stellar helium fusion

F.D. Becchetti E.R. Flynn D.L. Hanson J.W. Sunier 《Nuclear Physics A》1978,305(1):293-312

The reaction ¹²C(⁷Li, t)¹⁶O has been studied at

E(^{7} Li) = 34 MeV

with the LASL tandem accelerator and QDDD magnetic spectrometer. Angular distributions to levels with E_x < 11 MeV have been obtained from 0° to 90°, including 0°. The results have been analyzed with finite-range distorted-wave Born approximation theory. The α-particle spectroscopic factors and reduced widths obtained are compared with those calculated with group theory (SU(3)) and other models. The analysis of data for the 7.1 and 9.6 MeV J^π = 1^? levels, which are of great importance in stellar helium buring, yields a ratio, R, of dimensionless reduced α-widths

θ^{2}_{a} (7.1 MeV) θ^{2}_{a} (9.6 MeV) = 0.35b ± 0.13

. The observed line width of the 9.6 MeV level (Γ_c.m. = 390 ± 60 keV) is less than the accepted value (Γ_c.m. = 510 ± 60 keV) and implies θ²_a(9.6 MeV) ≈ 0.6. These results as well as data for the 6.92 MeV J^π = 2⁺ and 10.35 MeV J^π = 4⁺ “α-cluster” states indicate 0.09 < θ²_a(7.1 MeV) < 0.33 with a mean value θ²_a(7.1 MeV) = 0.14 ± 0.04. The implication for stellar helium burning is discussed. 相似文献

20.

High spin states in ⁹³mo populated in the (p,n) reaction

C. Günther M.V. Banaschik H. Hübel W.D. Schneider K.H. Gonsior P. Herzog 《Nuclear Physics A》1975,244(2):287-300

High spin states in the

ν d_{52} (π g_{92}^{2}

) multiplet in ⁹³Mo were investigated with the ⁹³Nb(p, n) ⁹³Mo reaction. A new isomeric state at 2430 keV with a half-life of 3.53±0.18 ns is interpreted as the lower

172^{+}

member of the multiplet. A number of further states have been identified. The results are compared to previous experiments and shell model calculations. 相似文献