A spectroscopic study of 49Ti

doi:10.1016/0375-9474(69)90829-X

Nuclear Physics A

Volume 125, Issue 1, 24 February 1969, Pages 65-79

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Abstract

The ^{50V(t, α)} and ⁵⁰Ti(d, t) reactions leading to ⁴⁹Ti were studied at bombarding energies near 13 MeV with an over-all energy resolution of about 15 KeV FWHM, and the ⁴⁹Ti(p, p′) process was investigated at 10 MeV incident energy with 5 keV resolution. A DW analysis of the (t, α) and (d, t) cross sections is presented, and the spectroscopic information is compared to recent model predictions. Several high-spin states of the $1f_{72}$ shell configurations were identified. A consistent level scheme for ⁴⁹Ti is proposed, and a sum-rule analysis of the l_p = 3 (t, α) strengths for multipole orders λ = 1 and 2 is given.

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Cited by (18)

Nuclear Data Sheets for A = 49
2008, Nuclear Data Sheets
Nuclear Data Sheets for A=49
1986, Nuclear Data Sheets
The 1978 evaluation of A=49 (78Ha15) has been revised using experimental decay and reaction data received by the cutoff date noted below. See also 75Be56 and 76Ha07 for mass excess and deformation calculations relevant to the unobserved nuclides of ⁴⁹Co and ⁴⁹Ni.
Thermonuclear reaction rates: see 79Wo07 for calculations on the production of A=49 nuclei via α- and p-induced reactions and 83Sa30 for a study on the effects of excited states on the reaction rates.
Neutron-induced reaction data: see the bibliography CINDA-A, CINDA-B, and supplements.
High-spin states in <sup>49</sup>Ti and the empirical (f<inf> 7 2</inf>)<sup>n</sup> model
1981, Nuclear Physics, Section A
High-spin states in ⁴⁹Ti have been populated through the ⁴⁸Ca(α, 3n) reaction. Excitation function, γ-ray angular distributions, γ-γ coincidences and half-lives were determined. Levels with the following energies (in keV) spins and parities are proposed 1542.5, $112^{−}$ ; 2505.8, $152^{−}$ ; 3290.6, $172^{−} and 4382.6, 192^{(−)} . These levels and their decay scheme are found to be very well described by the empirical (f_{72})^{n}$ model.
Spectroscopic study of the N = 27 nuclei by means of the (τ, α) reaction
1978, Nuclear Physics, Section A
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.
Nuclear data sheets for A = 49
1978, Nuclear Data Sheets
Nuclear structure data available through December 1977 are compiled, and adopted level properties are given. The bulk of the data is presented pictorially for easy comparison. Experimental details, references, and additional comments, where required, are given in the text. All drawings, tables, and comments are reproduced from the computerized Evaluated Nuclear Structure Data File (ENSDF). Any additions or corrections desired by the users should be addressed to the evaluators for maintenance and updating of the computer file.
The energy spectra and electromagnetic transitions of odd-a titanium isotopes
1977, Nuclear Physics, Section A
The isotopes ^{55, 47, 49, 51}Ti are studied in the framework of the deformed configuration mixing shell model. The calculated spectra and electromagnetic properties agree well with the observed ones. The calculations suggest the existence of an excited $K = 12$ band of states in ^{45, 47, 49}Ti and a $K = 72$ band in ⁵¹Ti. In ⁴⁹Ti this excited $K = 12$ band is more deformed than the “ground state band”. On the basis of the overall agreement between the calculated and experimental spectra and decay properties we suggest the spin assignments $J = 52$ , $72$ , $92$ , $52$ and $72$ to the states in ⁴⁷Ti observed at 2.168, 2.97, 2.408, 2.835 and 3.223 MeV, respectively.

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^†: Presently at University of Pennsylvania, Physics Department, Philadelphia, Penna., USA.

^†††: Now at AERE Harwell, Didcot, Berkshire, England.

^‡: Now at Daresbury Nuclear Physics Laboratory, near Warrington, Lancs, England.

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A spectroscopic study of 49Ti

Abstract

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A spectroscopic study of ⁴⁹Ti