Md. A. Rahman

Spectroscopic information from (3He,7Be) reaction on12C and24Mg

SummaryThe reaction (3He,7Be) on12C and24Mg has been analysed using four discrete potential families for7Be channel and one discrete potential family for3He channel to extract alpha spectroscopic factors. It is shown that the relative spectroscopic factors are reliable if they are calculated staying within one potential family (S(24Mg/12C)≃0.12). But, changing the potential family between12C and24Mg, one obtains the extreme cases, such asS(24Mg/12C)=0.025 and 0.51,i.e. 1∶20.RiassuntoÈ stata analizzata la reazione (3He,7Be) su12C e24Mg usando quattro famiglie discrete di potenziale per il canale7Be e una famiglia discreta di potenziale per il canale3He per estrarre fattori spettroscopici alfa. Si mostra che i fattori spettroscopici relativi sono attendibili se sono calcolati nell’ambito di una famiglia di potenziale (S(24Mg/12C)≃0.12). Cambiando la famiglia di potenziale tra12C e24Mg, si ottengono i casi estremi cosí comeS(24Mg/12C)=0.025 e 0.51, cioè 1∶20.РезюмеАнализируется реакция (3He,7Be) на ядрах12C и24Mg, используя четыре семейства дискретных потенциалов для канала7Be и одно семейство дискретного потенциала для канала3He, чтобы извлечь альфа-спектроскопические факторы. Показывается, что относительные спектроскопические факторы являются достоверными, если вычисляются с помощью одно-потенциального семейства (S(24Mg/12C)≃0.12) Изменяя семейство потенциалов от12C до24Mg, мождо оолучить предельные случаи, такие, чтоS(24Mg/12C)=0.025 и 0.51 т.е. 1∶20.

Nuclear inelastic-scattering cross-section for transitionsL=2 and 3 in the strong-absorption model

SummaryAustern and Blair have established the connection between inelastic and elastic nuclear scattering of strongly absorbed particles in the adiabatic approximation. Simple closed expressions again in the adiabatic approximation, under strong absorption condition, for the inelastic-scattering cross-section are obtained and made explicit by Potgieter and Frahn; these expressions are analogous to the strong-absorption model formulae for elastic scattering. We derive the inelastic-scattering cross-section for transitionsL=2 and 3 using their general formulations and test the derived formulae with experiments.

Alpha-spectroscopic factors from (d,6Li) and (3He,7Be) reaction on12C,24Mg,40Ca and58Ni

SummaryAn attempt has been made to compare the alpha-spectroscopic factors (Sα) resulting from (d,6Li) and (3He,7Be) reactions on12C,24Mg,40Ca and58Ni employing potentials characterizing the same potential family for the deuteron and3He channels and another set of potentials characterizing a particular potential family for the6Li and7Be channels, respectively. The spectroscopic factors so extracted for all four targets agree reasonably well in the two reactions.RiassuntoSi è tentato di confrontare i fattori alfa-spettroscopici (Sα) derivanti dalle reazioni (d,6Li) e (3He,7Be) su12C,24Mg,40Ca e58Ni, usando potenziali che caratterizzano la stessa famiglia di potenziali per i canali del deuterone e dell’3He e un altro gruppo di potenziali che caratterizzano una particolare famiglia di potenziali per i canali di6Li e7Be, rispettivamente. I fattori spettroscopici cosí ottenuti per tutti e quattro i bersagli sono in buon accordo nelle due reazioni.РеэюмеПредпринимается попытка сравнить альфа-спектроскопи ческие факторы (Sα), полученные иэ реакций (d,6Li) и (3He,7Be) на ядрах12C,24Mg,40Ca и58Ni, испольэуя потенциалы, характерные для семейства потенциалов для каналов и3Не, и другую систему потенциалов, характерных для семейства потенциалов для каналов6Li и7Be. Полученные спектроскопические факторы для всех четырех мищеней раэумно согласуются для рассмотренных двух реакций.

Spectroscopic information from (3He,7Be) reaction on12C and24Mg@@@Спектроскопическая информация из реакции (3He,7Be) на ядрах12C и24Mg

SummaryThe reaction (3He,7Be) on12C and24Mg has been analysed using four discrete potential families for7Be channel and one discrete potential family for3He channel to extract alpha spectroscopic factors. It is shown that the relative spectroscopic factors are reliable if they are calculated staying within one potential family (S(24Mg/12C)≃0.12). But, changing the potential family between12C and24Mg, one obtains the extreme cases, such asS(24Mg/12C)=0.025 and 0.51,i.e. 1∶20.RiassuntoÈ stata analizzata la reazione (3He,7Be) su12C e24Mg usando quattro famiglie discrete di potenziale per il canale7Be e una famiglia discreta di potenziale per il canale3He per estrarre fattori spettroscopici alfa. Si mostra che i fattori spettroscopici relativi sono attendibili se sono calcolati nell’ambito di una famiglia di potenziale (S(24Mg/12C)≃0.12). Cambiando la famiglia di potenziale tra12C e24Mg, si ottengono i casi estremi cosí comeS(24Mg/12C)=0.025 e 0.51, cioè 1∶20.РезюмеАнализируется реакция (3He,7Be) на ядрах12C и24Mg, используя четыре семейства дискретных потенциалов для канала7Be и одно семейство дискретного потенциала для канала3He, чтобы извлечь альфа-спектроскопические факторы. Показывается, что относительные спектроскопические факторы являются достоверными, если вычисляются с помощью одно-потенциального семейства (S(24Mg/12C)≃0.12) Изменяя семейство потенциалов от12C до24Mg, мождо оолучить предельные случаи, такие, чтоS(24Mg/12C)=0.025 и 0.51 т.е. 1∶20.

GENERALIZED DIFFRACTION MODEL STUDY OF INTERMEDIATE ENERGY PROTON-NUCLEUS SCATTERING

The three-parameter strong absorption model of Frahn and Venter is used to study elastic scattering of intermediate energy protons from several nuclei between 12C and 208Pb and the best-fit parameters are obtained and their systematics are discussed. The inelastic scattering of protons is then studied and the deformation parameters are extracted. A reasonably good account of both elastic and inelastic scattering is given by the same set of parameter values.

The6Li-nucleus scattering

SummaryThe elastic scattering of6Li from a number of nuclei between12C and208 Pb is studied within the framework of the strong-absorption model of Frahn and Venter over a wide range of beam energy. The parameters thus obtained are used to analyse the angular distribution for the inelastic scattering of6Li leading to the lowest 2+ states in12C,24,26Mg and56,60Ni and the quadrupole deformation parameter Β2 is extracted in each nucleus.

The Triton-Nucleus Scattering

Angular distributions of 17, 20 and 33 MeV tritons scattered elastically from sev-eral nuclei are studied within the framework of the strong absorption model of Frahnand Venter and the best-fit parameter values are obtained. Angular distribution dataof the inelastic scattering of tritons leading to the quadrupole and octupole excita-tions in some nuclei are then studied using the parameters and the corresponding deformation parameters β L are extracted.

STRONG ABSORPTION MODEL STUDIES OF PION-NUCLEUS SCATTERING AROUND THE Δ RESONANCE

Angular distribution data on the elastic scattering of pions are studied on several nuclei around the Δ resonance in terms of the three-parameter strong absorption model of Frahn and Venter. The parameters thus obtained are used in the analyses of inelastic scattering of pions leading to the lowest as well as higher lying 2+ and 3- states, and the corresponding deformation parameters are extracted.

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.

Nuclear structure of Mo 102

Nuclear structure of the {sup 102}Mo nucleus has been studied using the {sup 100}Mo(t,p){sup 102}Mo reaction with the triton beam energy of 12 MeV obtained from the tandem Van de Graaff accelerator and a multichannel magnetic spectrograph. Proton spectra are obtained at 12 different angles from 5 deg. to 87.5 deg., at an interval of 7.5 deg. and are detected in nuclear emulsion plates. Thirty-five levels in the energy range from 0.000 to 3.248 MeV have been observed. The results yield a number of new levels with spin assignments. Absolute differential cross sections for the levels have been measured. The experimental angular distributions are compared with the theoretical distorted-wave Born approximation calculations to determine L and J{sup {pi}} values. The present results are compared with the previous results.