Design and Development of a Mini-Orange Magnetic Spectrometer with Multichannel Facility for Conversion Electron Spectroscopy

Background: Conventional magnetic spectrometers used for conversion electron detection are very cumbersome, require strong magnetic fields and the spectra have to be scanned point by point and have very low transmission. A magnetic filter using permanent magnets and an Si(Li) detector would facilitate multichannel analysis with high transmission. The mini-orange is a new type of spectrometer for conversion electrons combining a solid state Si(Li) detector with a filter of permanent magnets around a central absorber of lead.Purpose: An indigenously developed magnetic spectrometer if optimized properly would be of great use in conversion electron spectroscopy for both online and offline experiments. Methods: A Mini-Orange magnetic spectrometer made of small permanent magnets has been designed and developed indigenously and optimized for its best performance condition. The transmission curves for different energy regions are plotted using the conversion electron spectra from the standard gamma transitions from 153Gd, 169Yb and 131Ba decays. The optimized spectrometer facilitates multichannel acquisition of conversion electron spectra for precision electron spectroscopy. The system also can be used in in-beam experiments with minor modifications of the vacuum chamber.Results: The optimized spectrometer was used for precision electron spectroscopy. Experimental transmission curves are then obtained by plotting Transmission (T) against the corresponding electron energy for low energy, medium energy and a broad energy range. Out of the several experiments done the optimum settings for f and g, that resulted in this curve, is identified at f = 7.5 cm and g = 4.5 cm. Conclusions: The optimized spectrometer facilitates multichannel acquisition of conversion electron spectra for precision electron spectroscopy. The system also can be used in in-beam experiments with minor modifications of the vacuum chamber

<span style="font-size:14.0pt;line-height: 115%;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; color:#111111;mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language: HI" lang="EN-IN">Measurement of α_K, α_L and α_M of the hindered E₃ transition in ¹⁰³Rh</span>

87-91The K, L and M internal conversion coefficients of the 39.76 keV 7/2+ →1/2 ̅ hindered transition in 103Rh are measured, using the normalized peak to gamma method. A Mini-orange electron spectrometer and a HPGe detector system have been employed for the study αM is being reported for the first time. The present study confirms the systematics of large deviations of experimental ICC of highly hindered high multipole transitions from the theoretical values

Spin-parity assignments to levels in the very-neutron-rich nucleus ¹¹³Rh

553-559Spins and parities have been assigned to the low-lying energy levels in the very neutron-rich Z=45 nucleus 113Rh identified in beta decay of the exotic fission fragment 113Ru. The assignments are based on the experimental intensities and log ft values, gamma energies, intensities, branchings and multi-polarities deduced from 113Ru decay, taken together with the trends for the analogous levels and their comparative feedings and decays in the lighter n-rich Rh isotopes with A=105-111, and the supporting model considerations. No abrupt pattern changes are noticed for this N=68 nucleus lying just beyond the N=66 mid shell point. Whereas the low-lying positive parity level energies show very little variation or a slow decreasing trend, the negative parity level energies are seen to rise sharply with the addition of successive neutron pairs. The intruder band, having reached minimum energy in the N=64 isotope109Rh, appears to have a parabolic increase on either side

Low-lying intrinsic structures in

Low-lying two-quasiparticle bandhead energies for the Z = 99 odd-odd nucleus 254Es are evaluated using a simple phenomenological model with the inclusion of the residual p-n interaction. Configurations of the intrinsic levels directly fed in 254Es from the parent 258Md are discussed in the light of this model. Our analysis predicts the occurrence of ten K≤5 bandheads in 254Es with excitation energies E x≤300keV. Structures of these as yet unidentified low-lying intrinsic levels and their expected locations are discussed in the light of available experimental information

Precision electron-gamma spectroscopic measurements in

The decay of 75Se to levels of 75As has been studied using an HPGe detector for gamma-ray and a mini-orange electron spectrometer for conversion electron measurements. We identify 38 transitions in this decay, including 18 gamma rays and 16 conversion electron lines reported for the first time. New results also include E2 multipolarity assignment for the 81 keV transition, M1 assignment to three newly observed transitions and M1 + E2 for the 617 keV transition. A revised 75As level scheme is constructed using the Ritz combination principle through the computer code GTOL. While confirming the existence of 10 well-established levels, two levels at 587 and 859 keV are newly placed into the decay scheme of 75Se. The interpretation of the observed levels in terms of various theoretical approaches is briefly discussed. The newly placed 586.8 keV 1/2- and 859.9 keV 1/2+ levels are studied in the light of the Interacting Boson-Fermion Model