W.E. Dorenbusch

Inelastic deuteron scattering from 1f72 nuclei

Abstract The elastic and inelastic scattering of deuterons from 1 f 7 2 nuclei ( 40,42,44 Ca, 45 Sc, 46,48 Ti, 50,51 V, 50,52 Cr and 54 Fe) has been measured at 7.50 MeV bombarding energy. The deuterons were detected in a multi-angle spectrograph in the angular interval from 22.5° to 157.5° with an energy resolution of 8 keV. The elastic scattering data were analysed by the optical model, and the 0 + → 2 1 + and 0 + → 3 − transitions were analysed by means of distorted-wave (DW) calculations. The angular distributions for transitions leading to 2 2 + , 4 + and 0 + states are discussed in terms of possible higher-order reaction mechanisms.

Deuteron stripping on the even isotopes of Ca (I)

Abstract Deuteron-stripping reactions on a special target consisting of approximately equal amounts of the five stable even calcium isotopes have been performed at 7.00 and 7.20 MeV. Angular distributions for the l n = 3 1 f 7 2 ground states and strongest 2 p 3 2 transitions were measured and analysed using the DWBA. Optical-model parameters for the analysis were obtained from 7.00 and 7.20 MeV elastic-scattering measurements. Transitions to the 2.017 MeV level of 41 Ca and 0.990 MeV level of 43 Ca both with l n = 2 were also obtained. Spectroscopic factors were deduced from the data and are discussed in terms of core excitation of the Ca ground-state target nuclei.

The 50Cr(3He, d)51Mn reaction

Abstract The reaction 50Cr(3He, d)51Mn has been investigated at 12.0 MeV bombarding energy using the MIT multiple-angle spectrograph. A DWBA analysis has been carried out on the angular-distribution data for 29 levels below 5.7 MeV of excitation to determine lp values and spectroscopic strengths. The transition to the 5 2 − ground state is compared with shell-model forbidden 5 2 − transitions to 47V, 51V,and 53Mn. The level structure of 51Mn is compared with shell-model calculations. The analogue-state transitions are compared with the 50Cr(d, p)51Cr results.

Even-parity states of 41Ca by the 39K(3He, p)41Ca reaction

Abstract The 39K(3He, p)41Ca reaction has been investigated at 13 MeV bombarding energy. Angular-distribution data for 20 levels were obtained and have been analysed using the DWBA. The results show the two-particle, one-hole character of many of the even-parity states of 41Ca and are compared with the calculated even-parity level scheme. A discussion of the results in terms of possible intermediate structure is given.

Levels of 48Ti observed by the (d, α) reaction on 50V

Abstract The 50 V(d, α ) 48 Ti reaction was examined at 7.50 MeV bombarding energy with a resolution of 15 to 25 keV. Measurements were performed at several angles between 30° and 165°. Energy levels, several of which are new, up to 5.7 MeV of excitation were identified. The relation between observed (d, α ) cross sections and final state spins is examined. It is suggested that those 48 Ti levels which are strongly excited in the (d, α ) reaction have spins between 6 and 10.

Excitation of 56Co by two-particle transfer reactions

Abstract The reactions 54Fe(3He, p)56Co and 58Ni(d, α)56Co have been investigated at energies of 12.0 and 7.0 MeV, respectively. Ground-state Q-values of 7.408±0.015 MeV for the (3He, p) and 6.506±0.010 MeV for the (d, α) reactions were measured. Angular distributions for eight of the (3He, p) transitions were measured and analysed using the DWBA in order to extract L-values. The level scheme of 56Co is discussed in terms of these results. The analogue of the 56Fe ground state was identified, and a reduced Coulomb energy ΔEC = 8.949±0.025 MeV was extracted.

A 50V(d, p) experiment

Abstract The reaction 50 V(d, p) 51 V has been investigated at 7.50 MeV bombarding energy, using the MIT multi-angle spectrograph. A total of 71 transitions were recorded below 6.65 MeV of excitation in 51 V. l n -values and spectroscopic strengths were determined from the measured proton angular distributions by means of a distorted wave analysis. The spectroscopic strengths are analysed in terms of the multipole sum roles for orders λ = 0, 1 and 2. It is concluded that the 50 V(g.s) wave function does not have good seniority. The possibility of observing “intermediate structure” in the (d, p) strength function is discussed.

The (3He, d) and (3He, p) reactions to states in 54Mn

Abstract The 53 Cr( 3 He, d) 54 Mn and the 52 Cr( 3 He, p) 54 Mn reactions have been investigated at 10.0 MeV and 11.0 MeV bombarding energies, respectively, using the MIT multiple-gap spectrograph. Transitions from the ( 3 He, d) reaction were observed up to an excitation energy of 5.56 MeV. Levels in this excitation range, as well as the transition to the isobaric analogue of the 54 Cr ground state (6.147 MeV), were observed in the ( 3 He, p) reaction. The results for both reactions were analysed in the distorted-wave Born approximation.

Level structure of 48V

Abstract Energy levels in 48 V up to 3.7 MeV of excitation were identified from the reactions 46 Ti( 3 He, p) 48 V and 50 Cr(d, α ) 48 V. Reaction particles were momentum analysed in the MIT multiple-gap spectrograph. The Q -value for the (d, α) reaction was found to be 4.923±0.015 MeV. The stronger ( 3 He, p) transitions were analysed to obtain values of the transferred angular momentum. The results are discussed in terms of 1 f 7 2 shell-model calculations. The transition to the 48 Ti ground-state analogue was observed, and the 48 V- 48 Ti Coulomb energy difference was found to be ΔE C = 7.813±0.025 MeV.

Energy levels in 48Cr observed in the 50Cr(p,t)48Cr reaction☆

Abstract Energy levels of 48 Cr have been studied with the 50 Cr(p,t) 48 Cr reaction at 51 MeV. Spin and parity assignments have been made for levels below 9 MeV of excitation. The ground-state Q value is 15100 ± 8 keV. Levels at 5 79 and 6.10 MeV have been identified as the T = 1 analogs of the ground and first-excited states in 48 V, respectively. A doublet is observed at 8.75 MeV near the energy expected for the T = 2 analog of the 48 Ti ground state.