https://doi.org/10.1140/epja/s10050-020-00281-y
Regular Article - Experimental Physics
Measurement of electric quadrupole moment in neutron rich $$^{131,132}$$I
1
Variable Energy Cyclotron Centre, Kolkata, 700 064, India
2
Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400 094, India
3
RCD-BARC, Variable Energy Cyclotron Centre, Kolkata, 700 064, India
4
Institute of Materials Chemistry, Vienna University of Technology, Wien, 1060, Austria
5
Saha Institute of Nuclear Physics, Kolkata, 700 064, India
6
Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, 711 103, India
7
Present address: Present Address: ICFAI University, Agartala, Tripura, 799210, India
* e-mail: btumpa@vecc.gov.in
Received:
12
May
2020
Accepted:
13
October
2020
Published online:
22
October
2020
The quadrupole moments of the excited levels in neutron rich iodine isotopes, viz., $$^{131}$$I (5/2$$_1^+$$) and $$^{132}$$I (3$$_1^+$$), have been measured with LaBr$$_3$$(Ce) detectors using Time Differential Perturbed Angular Correlation (TDPAC) spectroscopy. The excited levels were populated from $$\beta ^-$$ decay of the radiochemically separated tellurium (Te) fission products produced in $$^{nat}$$U($$^4$$He,f) reaction at E$$_{\alpha }$$(lab) = 40 MeV from K-130 cyclotron at VECC, Kolkata. The active tellurium fission products were radiochemically doped in metallic tellurium matrix to provide the necessary Electric Field Gradient (EFG) required for TDPAC measurement. The values of quadrupole moments for the 5/2$$_1^+$$ level of $$^{131}$$I and 3$$_1^+$$ level of $$^{132}$$I were determined to be $$(-)$$0.30(1) eb and (−)0.25(2) eb, respectively. The present measurement provides the first experimental determination on the electric quadrupole moment of 5/2$$_1^+$$ level of $$^{131}$$I.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
