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Lifetime measurements of microsecond isomers in the N=48 nuclei {sup 88}Zr and {sup 90}Mo using recoil-isomer tagging

The recoil-isomer tagging technique has been used to study the isomeric states of nuclei in the vicinity of the N=50 shell closure. The nuclei of interest were separated from the projectilelike nuclei and other evaporation residues and transported to the focal plane of a recoil separator. The decay...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2004-07, Vol.70 (1)
Main Authors: Chakraborty, A., Krishichayan, Ghugre, S.S., Goswami, R., Mukhopadhyay, S., Pattabiraman, N.S., Ray, S., Sinha, A.K., Sarkar, S., Madhusudhana Rao, P.V., Garg, U., Basu, S.K., Chaturvedi, L., Dhal, A., Sinha, R.K., Govil, I.M., Chatterjee, M.B., Sarkar, M. Saha, Bhowmik, R.K., Jhingan, A., Department of Physics, University of Burdwan, Burdwan 713104, Department of Nuclear Physics, Andhra University, Waltair 530003, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, Variable Energy Cyclotron Center, Sector-I/AF, Bidhan Nagar, Kolkata 700064, Department of Physics, Banaras Hindu University, Varanasi 221005, Department of Physics, Panjab University, Chandigarh 160014, Saha Institute of Nuclear Physics, Sector-I/AF, Bidhan Nagar, Kolkata 700064, Nuclear Science Center, Aruna Asaf Ali Marg, New Delhi 110067
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Language:English
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Summary:The recoil-isomer tagging technique has been used to study the isomeric states of nuclei in the vicinity of the N=50 shell closure. The nuclei of interest were separated from the projectilelike nuclei and other evaporation residues and transported to the focal plane of a recoil separator. The decay of the tagged isomer was studied at the focal plane using a high-purity Ge detector. The prompt transitions feeding the isomer were detected in an array of Clover Ge detectors placed around the target. The measured half-lives of the 8{sup +} isomers in {sup 88}Zr and {sup 90}Mo are 1.41{sub (-0.09)}{sup (+0.12)} {mu}s and 1.17{sub (-0.07)}{sup (+0.19)} {mu}s, respectively. The corresponding transition probabilities are in reasonable agreement with the predictions of shell model calculations. The systematics of effective charges (e{sub p} and e{sub n}) for N=48 nuclei are qualitatively understood in these calculations.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.70.014311