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1.

f_{72}

shell nuclei from inelastic ³He scattering

Hans-Peter Morsch 《Nuclear Physics A》1974,226(3):506-518

相似文献

2.

Level structure of ⁴⁸Sc from the ⁴⁸Ca(p,nγ) reaction

Kusuo Ashibe Hiroshi Taketani 《Nuclear Physics A》1975,255(2):360-386

Levels of ⁴⁸Sc up to 3.33 MeV excitation were studied by the reaction ⁴⁸Ca(p,nγ)⁴⁸Sc employing a variety of experimental techniques. A level scheme of ⁴⁸Sc comprising 29 excited states and 54 transitions were determined from the measurements of γ-γ coincidences and γ-ray excitation functions. Within the framework of the statistical compound nucleus model spins and parities of the ⁴⁸Sc levels were assigned from the angular distributions and linear polarizations of the de-excitation γ-rays as well as the excitation functions of the residual levels. From the present experimental results and other available data we tentatively identified some of the levels of the (

1 f_{72}^{9}

,

1 d_{32}^{?1})

, (

1 f_{72}^{9}, 2 s_{12}^{?1}

), (

1 f_{72}^{7}, 2 p_{32}

) and (

1 f_{72}^{7}, 1 f_{52}

) configurations in addition to the well-known (

π f_{72}, v f_{72}^{?1}

) multiplet. 相似文献

3.

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

4.

Glueball spectroscopy from strong coupling expansions in hamiltonian lattice QCD

N. Kimura 《Nuclear Physics B》1984,246(1):143-156

Masses of all the glueballs which are created by 6- or 7-link operators are calculated to order g^?8 in pure SU(3) hamiltonian lattice gauge theory. Several low-lying states are found with masses

m(0^{++1})～ 1.4 m_{s}, m(0^{++7}) ～ 1.7 m_{s}

(¹ and ⁷ stand for radial excitations and m_s is the mass of the lowest 0⁺⁺ state),

m(0^{??}) ～ 2.2 m_{s}, m(1^{+?1}) ～ m(1.6 m_{s}, m(1^{?+}) ～ 1.8 m_{s}, m(1^{??) ～ 2.2 m_{s}andm(2^{++}) ～ 1.3 m_{s}}

. These values are obtained at the point g^?2 ? 0.8, which lies near the scaling region. 相似文献

5.

M1 states in ⁵⁸Ni observed by proton inelastic scattering at 65 MeV

M. Fujiwara Y. Fujita I. Katayama S. Morinobu T. Yamazaki H. Ikegami S.I. Hayakawa K. Katori 《Nuclear Physics A》1983,410(1):137-146

Inelastic proton scattering at 65 MeV was used to study 1⁺ states in ⁵⁸Ni. A new 1⁺ state was found at an excitation of 5.166 MeV. The angular distributions for the 1⁺ states at 2.903 and 5.166 MeV were well reproduced by a DWBA calculation under the assumptions of pure

v(p_{32} f_{52}) and v(p_{32} p_{12})

configurations, respectively. The angular distribution for the previously suggested 1⁺ state at 7.721 MeV was not well discribed by the DWBA calculation with the isoscalar

(f_{72}^{?1} f_{52})

wave function. The shape of the angular distribution for the 10.672 MeV, 1⁺ state was well reproduced by the DWBA calculation with the isovector

(f_{72}^{?1} f_{52})

wave function. 相似文献

6.

Magnetic moment of the 2543 keV 7⁺ state in ⁴⁰K

E. Bozek C. Gehringer J.C. Merdinger K. Ogawa J.P. Vivien 《Nuclear Physics A》1976,264(1):151-156

The nuclear g-factor of the 2543 keV, 7⁺ state ⁴⁰K has been measured as g = 0.59 ± 0.10. Time-integral perturbed angular distributions were measured in an external magnetic field and, after implantation, in the hyperfine field at potassium in nickel. The experimental value is discussed within the

f_{72}^{2} and d_{32}^{?2} f_{72}^{2}

, configurations. 相似文献

7.

The effective T = 1 two-particle matrix elements in the fp shell

P.B. Vold D. Cline R.N. Boyd H. Clement W.P. Alford J.A. Kuehner 《Physics letters. [Part B]》1978,72(3):311-314

The ⁴¹Ca(

d

, p)⁴²Ca reaction has been used to locate the strength distributions for

p_{32}

and

p_{12}

transfer in ⁴²Ca. Effective

(f_{72})^{2}

,

f_{72} p_{32}

and

_{72}_{12}

two-body matrix elements are derived from the data and compared to theoretical predictions. 相似文献

8.

Gravitational collapse in quantum mechanics with relativistic kinetic energy

Elliott H Lieb Walter E Thirring 《Annals of Physics》1984,155(2):494-512

It is proved that the quantum mechanical Hamiltonian

H = Σ_{i=1}^{N} (p^{2} + m^{2})^{12} ? κ Σ_{i>j} |x_{i} ? x_{j} |^{?1}

for bosons (resp, fermions) is bounded from below if N ≤ c_bκ^?1 (resp.

N ≤ c_{f} κ^{?32}

). H is unbounded from below if N ≥ c_b^lκ^?1 (resp.

N ≥ c_{f}^{l} κ^{?32}

). The constants c_b and c_b^l (resp. c_f and c_f^l) differ by about a factor 2 (resp. 4). 相似文献

9.

Nuclear spectroscopy in 48V via the 34S(16O,pn)48V reaction

P. Taras B. Haas R. Vaillancourt 《Nuclear Physics A》1974,232(1):99-124

The electromagnetic decays of 18 bound states in ⁴⁸V have been studied via the ³⁴S(¹⁶O, pn)⁴⁸V reaction, at incident ion energies of 30–36 MeV. At these energies pn, 2pn, 2p, αp, αn and 2n exit channels were open. Spins and parities of the levels as well as the branching and mixing ratios of their decay γ-rays have been obtained from angular distribution, excitation function, and high resolution γ-γ and n-γ coincidence measurements. Six, and possibly seven, members of a very pure rotational negative parity band have been identified. This band is based on a 1^? low-lying core excited state with probable configuration

(π d_{32})^{?1} (π f_{72})^{4} (ν f_{72})^{5}

. 相似文献

10.

Systematics of energies of particle-hole states in the 2s-ld and 1f72 shells

R. Sherr R. Kouzes R. Del Vecchio 《Physics letters. [Part B]》1974,52(4):401-406

The systematics of particle-hole states in the 2s-1d and

1f_{72}

shells have been analyzed in terms of the Bansal-French-Zamick weak coupling method. States considered are

d^{?}_{32} f^{n}_{72} (J = 32^{+}), (s?d)^{n} 72 (J = 72^{?}) and (s?d)^{n} f^{2} 72 (J = 0^{+} and 7^{+})

, the jⁿ components corresponding to even-even ground states. 相似文献

11.

Medium-spin levels and the character of the 20.4 ns

132^{+}

isomer in ¹⁴⁵Gd

A. Pakkanen J. Muhonen M. Piiparinen J. Blomqvist 《Nuclear Physics A》1982,373(2):237-255

Levels of the N = 81 nucleus ¹⁴⁵Gd have been investigated by in-beam γ-ray and conversion electron spectroscopy with the ¹⁴⁴Sm(³He, 2n) reaction. Fourteen new low- and medium-spin states between 1.0 and 2.4 MeV excitation, the known yrast levels up to spin

212^{+}

, five other high-spin non-yrast states and a new 20.4 ns

132

isomer at 2200.2 keV in ¹⁴⁵Gd have been observed. The isomer decays via a fast 927.3 keV E3 transition with B(E3) = 48 ± 7 W.u. Another weaker decay branch is a mixed, strongly hindered E1 + M2 + E3 transition to the

v h^{?1}_{112}

state. We propose an octupole

v f_{72} j^{?2} × 3^{?}

main configuration for the isomer, analogous to the 997 keV

132^{+}

isomer in ¹⁴⁷Gd. The levels of ¹⁴⁵Gd are discussed on the basis of the spherical shell model. 相似文献

12.

The doubly odd nucleus 144Pm: (II). Interpretation

M.R. Macphail R.G. Summers-Gill 《Nuclear Physics A》1976,263(1):12-28

Results from the proton transfer reactions, ¹⁴³Nd(³He, d) and ¹⁴³Nd(α, t), and γ-ray studies have been used to characterize the levels in ¹⁴⁴Pm. The spins,

(^{3} He, d) (α, t)

cross section ratios and γ-ray branching ratios for the states below 600 keV can be interpreted consistently in terms of the mixed

π2 d_{52} ν2 f_{72}

and

π1 g_{72} ν2 f_{72}

shell-model configurations. The γ-ray intensity ratios measured in the ¹⁴¹Pr(α, nγ) and ¹⁴⁴Nd(p, nγ) reactions exhibit a strong and smooth dependence on level spin. Theoretical calculations employing a residual surface delta interaction are in reasonable agreement with the twelve observed low-lying negative parity states. The eight positive parity states between 841 and 1451 keV are presumed to arise from the

π1 h_{112} ν2 f_{52}

configuration. 相似文献

13.

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

14.

Semi-realistic shell model studies in the lead region. II. ²¹¹Bi

W. Baldridge N. Freed J. Gibbons 《Physics letters. [Part B]》1973,46(3):341-345

The semi-realistic approach described earlier is applied to a calculation of the ²⁰⁸Pb ± 3 nucleus ²¹¹Bi. It is shown that the anomalously low lying

72^{?}

first excited state arises from the particularly strong coupling between the

f_{72}

single-proton state and the

72^{?}

member of the

i_{132}

? ²⁰⁸Pb(3^?) core multiplet. 相似文献

15.

The 85Rb(p,d)84Rb reaction

S. Shastry R.A. Emigh R.J. Peterson R.E. Anderson 《Nuclear Physics A》1978,304(1):40-50

The spectrum seen in single neutron pickup leading to the doubly odd nucleus ⁸⁴Rb is remarkably clean, with only five levels populated by l = 4 and six by l = 1 transitions. A simple 2J+1 weighting for the l = 4 data, combined with previous information on ⁸⁴Rb, allowed the J^π = 2^?–7^? states of the (

v g_{92}^{?3} ? π f_{52}^{?3}

) multiplet to be identified. These data are used to determine the two-hole

π f_{52}^{?1} -v g_{92}^{?}

interaction matrix elements. 相似文献

16.

Spectroscopic study of the N = 27 nuclei by means of the (τ, α) reaction

S. Fortier E. Hourani M.N. Rao S. Galès 《Nuclear Physics A》1978,311(3):324-367

The (τ, α) reaction on ⁴⁸Ca, ⁵⁰Ti, ⁵²Cr and ⁵⁴Fe target nuclei has been studied at 25 MeV incident energy. Angular distributions have been measured from 5° to 40° with a split-pole spectrometer in a large range of excitation energy. A local zero-range DWBA analysis has been carried out, using an isospin-dependent potential for the calculation of the neutron form factor, in order to get a coherent set of spectroscopic factors for both T_> and T_< levels in different nuclei. Assignments of l-values have been done for a large number of levels, most of them previously unknown, and energy centroids of hole states have been determined. Spectroscopic factors in ³⁹Ca, ⁴⁷Ti, ^{49, 52, 53}Cr have also been obtained for strongly excited states. A sum rule analysis has been carried out for the N = 27 nuclei: the

1 d_{32} and 2 s_{12} T_{<}

hole strengths are generally fully exhausted by the observed levels, whereas only a fraction of the

1 d_{52}

strength has been evidenced. The

1 f_{72}, 1 d_{32} and 2 s_{12}

analog states have been observed in all nuclei; in ⁵³Fe, the

1 d_{32} and 2 s_{12}

analog states appear to be split in several components. In addition, a CRC analysis has been carried out for some levels with angular distributions not accounted for by a direct pick-up process. These levels are tentatively identified with states resulting from the coupling of one

f_{72}

neutron hole with excited states of the target nucleus. In particular, the

52^{?} and 92^{?}

members of the

[2^{+} ? f_{72}^{?1}]

configuration have been identified in each final nucleus. Unambiguous J^π assignments are made; and the two-step (τ, α) reaction therefo e appears as a useful spectroscopic tool, especially for investigating high spin states. 相似文献

17.

Three-body effective interactions in the f72 region

Yair Yariv 《Nuclear Physics A》1974,225(3):382-396

The three-body effective forces in a pure

(0 f_{72})^{n}

model space are calculated to second order in perturbation theory. The full effect of the

(0f_{72} 1 p_{32})^{3}

configuration on the effective interaction in the

(0 f_{72})^{3}

model space leading to three-body forces is calculated to all orders in G. The resulting three-body force matrix elements come out much weaker than demanded by phenomenological fits. Their main effect is to push the spectra as a whole up in energy, improving the fit of the calculated ground state binding energies with experiment. The biggest three-body-force contribution appears toward the end of the

f_{72}

shell where its main object is to compensate for Pauli violations arising from the two-body diagrams. 相似文献

18.

A useful spectroscopic tool: The (7Li, 6He) reaction

K.W. Kemper R.L. White L.A. Charlton G.D. Gunn G.E. Moore 《Physics letters. [Part B]》1974,52(2):179-182

Angular distribution measurements for the reactions ²⁴Mg(⁷Li, ⁶He)²⁵ Al and ⁵²Cr(⁷Li, ⁶He)⁵³ Mn at

E(^{7} Li) = 34

MeV show that for angles less than 15°, the shapes of the measured angular distributions allow

d_{52}

or

d_{32}

, and

f_{72}

or

f_{52}

final-state configurations to be distinguished when compared with finite-range DWBA calculations. 相似文献

19.

Structure of positive parity states in ²⁹P and two-step processes in (p,t) reactions

K.K. Seth A. Saha H. Nann B.H. Wildenthal 《Physics letters. [Part B]》1975,59(4):333-335

From a study of (p,t) reactions on ³¹P and ³⁰Si it is suggested that in ²⁹P the states with

J^{π} = 12_{1}^{+}

and

12_{2}^{+}

, the pair

32_{2}^{+}

,

52_{1}^{+}

, and the pair

72_{3}^{+}

,

92_{1}^{+}

are related by weak coupling of a s

_{12}

proton with the states 0₁⁺, 0₂⁺, 2₁⁺ and 4₁⁺ respectively of ²⁸Si. Completely atypical L = 2 angular distributions have been obtained for the

32_{1}^{+}

and

52_{2}^{+}

states in ²⁹P and it is suggested that this is due to contribution by two-step processes. 相似文献

20.

New measurements of the

n^{2} P_{12,32}

energy levels of Cs(I)

C.-J. Lorenzen K. Niemax 《Journal of Quantitative Spectroscopy & Radiative Transfer》1979,22(3):247-252

The energies of the

n^{2} P_{12} (7 ≤ n ≤ 13)

and

n^{2} P_{32} (7 ≤ n ≤ 27)

levels of CsI have been redetermined photographically from high resolution absorption measurements of the principal series lines

6^{2} S_{12} ? n^{2} P_{J}

X. The new data disagree significantly [ ≈0.13 cm^-1] with the values given in the NBS-Tables of Moore¹ which are taken from a paper by Kratz.² By means of an extended Ritz-formula, the ionization energy of CsI was found to be 31406.46±0.03 cm^-1, which is, within the limit of uncertainty, in agreement with the data of Kleiman,³ Eriksson et al.,⁴ Bockasten,⁵ and Eriksson and Wenåker.⁶ 相似文献