Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session E09: Nuclear Astrophysics III
7:00 PM–9:15 PM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kohala 2
Chair: Andrew Ratkiewicz, Lawrence Livermore National Laboratory
Abstract: E09.00002 : Observed reduction of α-decay rate under compression and correlation to decay Q-value*
7:15 PM–7:30 PM
Presenter:
Amlan Ray
(Variable Energy Cyclo Ctr)
Authors:
Amlan Ray
(Variable Energy Cyclo Ctr)
Arindam K Sikdar
(Variable Energy Cyclotron Center)
Joydip Nandi
(Variable Energy Cyclotron Center)
Jagannath Datta
(Variable Energy Cyclotron Center)
Jaykumar D Patel
(Variable Energy Cyclotron Center)
Riya Baidya
(Tripura University, India)
Parnika Das
(Variable Energy Cyclotron Center)
Deepak Pandit
(Variable Energy Cyclotron Center)
Density functional calculations indicate that the pressure on the implanted 211At ions ( α-emitter; half-life ≈ 7.2 hours) in Pd (lattice constant=3.9Å) would reduce Q-value of α-decay by ~70 eV compared to that in Pb (lattice constant=4.9Å) without any measurable change of electron density at 211At nucleus, thus decreasing α-decay rate in Pd by ~0.08%. We produced 211At by 209Bi(4He,2n)211At reaction at VECC, Kolkata and implanted them in Pb and Pd foils. 211At decays by α-emission ( α-line: 5869.5 keV) and EC followed by prompt α-decays. The emitted α-particles from Pb and Pd catcher foils were counted by a PIPS detector in an evacuated chamber along with a 250Hz pulser to correct for the dead time of Data Acquisition System. Experimentally, the quantity [(λEC ∼λα)/λα]×100% for 211At implanted in Pb and Pd was measured by monitoring the ratio of the sum of prompt α-decay lines followed by EC to 5869 keV α-line with time and found to be higher in Pd by (0.064 ± 0.019)%, providing first definitive observation of the reduction of λα under compression and correlation to Q-value reduction.
[1] H. Schatz et al., ApJ 579, 626 (2002).
[2] F. Belloni, Eur. Phys. J. A52, 32 (2016).
*A. Ray acknowledges financial support from Science and Engineering Research Board (Government of India) grant no: CRG/2020/003237
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