A.R. Majumder

A study of the level structure in 57Fe from the (d, p) reaction on 56Fe

Abstract The reaction 56 Fe(d, p) 57 Fe is investigated at 12 MeV using the Aldermaston multi-channel magnetic spectrograph. The angular distributions of protons leading to various states in 57 Fe upto an excitation of 6.7 MeV are measured over an angular range 5°–175°. The data are analysed with the distorted wave Born approximation calculations; a satisfactory agreement is found in most cases upto about 100°. Spin, parity and the spectroscopic factors for various states are obtained and the positions of the single-quasiparticle energies determined. The results are compared with those for the isotonic nuclei 55 Cr and 59 Ni and with the pairing theory.

A study of the levels in 56Fe from inelastic scattering of deuterons

Abstract Energy levels in 56 Fe have been obtained up to an excitation of 4.5 MeV from the inelastic scattering of 12 MeV deuterons by using a multi-gap magnetic spectrograph with nuclear emulsion as the detector. Angular distributions for these levels were measured, and the results were analysed in terms of the distorted-wave method using the collective model of interaction by deforming both real and imaginary parts of the optical potential. Good agreement was found for the first 2 + and the octupole vibrational states, and the corresponding deformation parameters were extracted.

Level structure of 51Cr from the (d, p) reaction on 50Cr

Abstract The level structure of 51 Cr is studied through the 50 Cr(d, p) reaction at E d = 12 MeV using the Van de Graaff accelerator and multi-channel magnetic spectrograph at AERE, Harwell. A total of 174 levels was observed up to E x ≈ 8.1 MeV. The stripping angular distributions are analysed in terms of the DWBA model with NLFR corrections. Spins, parities and spectroscopic factors are obtained for various levels and a sum rule analysis is made. Hauser-Feshbach calculations are done for the non-stripping levels and the levels showing a poor DWBA fit. Finally, the level spectrum is compared with the MBZ and MS models.

Level properties of 50V through the 51V(τ, alpha;) reaction

Abstract The 51 V(τ, α) 50 )V reaction has been studied at E τ = 18.0 MeV using a multichannel magnetic spectrograph. Seventy levels up to an excitation of 9.3 MeV have been observed, including five analogues. The angular distributions have been analysed in terms of the DWBA theory of direct reactions; a sum rule analysis has been made with the spectroscopic strengths so obtained. The effects of non-locality and finite range in the optical potential and of the cut-off radius and optical model parameter sets were also studied. Except for a few levels, the l -assignments agree well with previous neutron pick-up work; some new assignments of l -values are also made. In addition to l = 0, 2 and 3 transitions, a few weak l = 1 transitions were also observed.

A study of the (d, α) reaction in 56Fe at 12 MeV

Abstract The (d, α) reaction in 56Fe is studied at Ed = 12 MeV and angular distributions of the α-particles are obtained over the angular range 13°–83° (c.m.s.); the results are analysed in terms of the DWBA theory of direct reactions using the two-nucleon pick-up mechanism of Glendenning. Spectroscopic information on 54Mn levels up to 4.3 MeV excitation is obtained.

A study of the (τ, α) reaction on 50Cr

Abstract The 50 Cr(τ, α) 49 Cr reaction has been studied at E τ = 16.0 MeV using the Tandem Van de Graaff accelerator and the multichannel magnetic spectrograph of the Nuclear Physics Laboratory, Oxford. Twenty-nine levels up to an excitation of ≈ 6.8 MeV have been observed, including a few analogues. The angular distributions have been analyzed in terms of the DWBA theory of direct reaction. The J π limits and spectroscopic factors are obtained for various levels.

Level properties of 60Co from the (d,p) reaction on 59Co

The 59Co(d,p) reaction has been studied at Ed=14 MeV using a single-channel magnetic spectrograph. The energy levels in 60Co have been obtained up to Ex approximately 6.2 MeV and the angular distributions have been measured for the levels over an angular range 7 degrees -45 degrees . The data up to Ex approximately 6 MeV have betn analysed in terms of the nonlocal finite-range DWBA method and the ln values and spectroscopic factors are derived. A sum-rule analysis of the spectroscopic factors has been carried out.

Low-lying levels in44Sc populated in the (d, t) reaction on45Sc

SummaryLow-lying levels in44Sc are studied via the45Sc(d,t) reaction atEd=12MeV. Angular distributions are measured for twelve levels up toEx∼1.5 MeV andC2S values are extracted from DWBA analyses. Results are compared with those given in previous single neutron pick-up reactions and the shell model theory.