Abstract
Work has been done to evaluate and update the mass chain A=211, 222 and 224. The present status of the work is as follows: (a) The A=211 mass chain has been submitted for review. The students from NDC, IIT Roorkee and MMU Mullana contributed in this mass chain. The comments from the referee have been received and the final version will be submitted within few days. (b) In mass chain A=215, two nuclides namely {sup 215}Ac and {sup 215}Fr are being updated. This work will be completed before 01.03.2013. (c) This A=222 mass chain has been published [S. Singh et al., Nucl. Data Sheets 112 (2011) 2715]. (a) In the A=224 mass chain, there are total 10 nuclides and three nuclides namely {sup 224}At, {sup 224}Bi, {sup 224}Th have been updated. Out of these three nuclides {sup 224}At has been included in the ENSDF database so that the updated information for this nuclide will be incorporated in the upcoming evaluation by Audi et al. 2011AuZZ. The evaluation of {sup 224}Po and {sup 224}Pa is on-going. We are planning to submit this evaluation by the end of July-2013. Evaluation of {sup 224}U is also going on which will soon be ready
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Jain, A. K.
[1]
- Indian Institute of Technology Roorkee, Roorkee 247667 (India)
Citation Formats
Jain, A. K.
Nuclear Data Activities at I.I.T. Roorkee - Period 2011-13.
IAEA: N. p.,
2013.
Web.
Jain, A. K.
Nuclear Data Activities at I.I.T. Roorkee - Period 2011-13.
IAEA.
Jain, A. K.
2013.
"Nuclear Data Activities at I.I.T. Roorkee - Period 2011-13."
IAEA.
@misc{etde_22178125,
title = {Nuclear Data Activities at I.I.T. Roorkee - Period 2011-13}
author = {Jain, A. K.}
abstractNote = {Work has been done to evaluate and update the mass chain A=211, 222 and 224. The present status of the work is as follows: (a) The A=211 mass chain has been submitted for review. The students from NDC, IIT Roorkee and MMU Mullana contributed in this mass chain. The comments from the referee have been received and the final version will be submitted within few days. (b) In mass chain A=215, two nuclides namely {sup 215}Ac and {sup 215}Fr are being updated. This work will be completed before 01.03.2013. (c) This A=222 mass chain has been published [S. Singh et al., Nucl. Data Sheets 112 (2011) 2715]. (a) In the A=224 mass chain, there are total 10 nuclides and three nuclides namely {sup 224}At, {sup 224}Bi, {sup 224}Th have been updated. Out of these three nuclides {sup 224}At has been included in the ENSDF database so that the updated information for this nuclide will be incorporated in the upcoming evaluation by Audi et al. 2011AuZZ. The evaluation of {sup 224}Po and {sup 224}Pa is on-going. We are planning to submit this evaluation by the end of July-2013. Evaluation of {sup 224}U is also going on which will soon be ready for submission. Work has been done to evaluate and update the mass chain A=139. The present status of the work is as follows: (a) There are a total of 16 nuclides in this mass chain and 10 nuclides namely {sup 139}Nd, {sup 139}Sb, {sup 139}Te, {sup 139}Xe, {sup 139}I, {sup 139}Dy, {sup 139}Tb, {sup 139}Gd, {sup 139}Eu and {sup 139}Sm have been up updated. (b) For {sup 139}Cs, the individual data sets and adopted data set have been updated. The results of Pandora are being studied for fine tuning the adopted data set. (c) The evaluation of {sup 139}Ba is also in progress and data from the latest experiment held at BARC is awaited for being included. (d) The data on {sup 139}Pm have been evaluated and a final checking of the evaluation is presently going on. A systematic study of Nuclear Isomers has been done based on which an Atlas of Nuclear Isomers has been prepared (a horizontal evaluation). Details of this study are as follows: We have prepared an Atlas of all the known nuclear isomers for all the neutron and proton numbers, to highlight the extent of information in this promising and highly interesting field. The total number of nuclear isomers for the complete mass region has been found to be about 2252 including 507 nuclei having only one known isomer and 559 nuclei having isomers between 2 and 5. Nuclear isomers have been found all over the nuclear chart, the largest number being near the magic numbers and gap. It was interesting to find {sup 180}Ta to have the largest number (13) of isomeric states. {sup 179,177}Ta, {sup 152}Eu, {sup 214}Rn were found to have 10 isomeric states each. A theoretical estimation of the half-lives of transitions was made using the Weisskopff single particle estimates which were then compared to the experimental half-lives. The number of isomers is found to be highest in the range 1 ns-100 ns. The number falls gradually with the increase in half-life of the isomeric states up to 0.1s and then a small rise being observed at 10s-10{sup 3}s. The detailed results and findings have been presented in the conferences listed below. (1) Atlas of Nuclear Isomers and their Systematics, A.K. Jain, Talk delivered at Argonne National Lab, USA during a visit in August 2012. (2) Atlas of Nuclear Isomers and Spin Systematics, A.K. Jain, Invited talk in the BRNS workshop on Evaluation of Nuclear Structure and Decay Data, November 26-29, 2012, VECC, Kolkata. We have studied/developed a global systematics of the spins (total angular momentum) of nuclear isomeric states for nuclei in the whole mass region from A=1 to 240. Systematics of spins have been made region wise for a) Z(28-50) and N(28-50), b) Z(50-82) and N(50-82), and c) Z(50-82) and N(82-126). We observe that nuclear isomers having half-integer spins are more in number as compared to nuclei having integral spins for spins less than 6 to 6.5 h. This pattern changes its signature after 6.5 h where we find integral spins lying at the peaks between 6 to 10.5 h. Also, the high spin isomers are more likely in even-even or, in odd-odd nuclei which probably happens because higher spin excitations lie closer to the ground state in these nuclei. A maximum number of high spin isomers was observed at spin values 5.5, 6, 7 and 10h. A further up-gradation of the Atlas of isomers is being carried out to include the newly identified isomers and other new information. While updating the data from ENSDF and NUBASE 2012, we found some isomeric states which are having a longer half-life than their corresponding ground state in this region particular in higher mass neutron rich region. The chart of nuclear isomers based on the experimental data shows a significant gap in this region which motivates us to visit this region for the search of new isomers. We plan to study the following in the actinide region and beyond: (a) Fission isomers having half-life greater than 100ns (b) Rest of isomers having half-life greater than 100 ns (c) Fission isomers having half-life in the range of 1 ns- 100 ns.}
place = {IAEA}
year = {2013}
month = {Aug}
}
title = {Nuclear Data Activities at I.I.T. Roorkee - Period 2011-13}
author = {Jain, A. K.}
abstractNote = {Work has been done to evaluate and update the mass chain A=211, 222 and 224. The present status of the work is as follows: (a) The A=211 mass chain has been submitted for review. The students from NDC, IIT Roorkee and MMU Mullana contributed in this mass chain. The comments from the referee have been received and the final version will be submitted within few days. (b) In mass chain A=215, two nuclides namely {sup 215}Ac and {sup 215}Fr are being updated. This work will be completed before 01.03.2013. (c) This A=222 mass chain has been published [S. Singh et al., Nucl. Data Sheets 112 (2011) 2715]. (a) In the A=224 mass chain, there are total 10 nuclides and three nuclides namely {sup 224}At, {sup 224}Bi, {sup 224}Th have been updated. Out of these three nuclides {sup 224}At has been included in the ENSDF database so that the updated information for this nuclide will be incorporated in the upcoming evaluation by Audi et al. 2011AuZZ. The evaluation of {sup 224}Po and {sup 224}Pa is on-going. We are planning to submit this evaluation by the end of July-2013. Evaluation of {sup 224}U is also going on which will soon be ready for submission. Work has been done to evaluate and update the mass chain A=139. The present status of the work is as follows: (a) There are a total of 16 nuclides in this mass chain and 10 nuclides namely {sup 139}Nd, {sup 139}Sb, {sup 139}Te, {sup 139}Xe, {sup 139}I, {sup 139}Dy, {sup 139}Tb, {sup 139}Gd, {sup 139}Eu and {sup 139}Sm have been up updated. (b) For {sup 139}Cs, the individual data sets and adopted data set have been updated. The results of Pandora are being studied for fine tuning the adopted data set. (c) The evaluation of {sup 139}Ba is also in progress and data from the latest experiment held at BARC is awaited for being included. (d) The data on {sup 139}Pm have been evaluated and a final checking of the evaluation is presently going on. A systematic study of Nuclear Isomers has been done based on which an Atlas of Nuclear Isomers has been prepared (a horizontal evaluation). Details of this study are as follows: We have prepared an Atlas of all the known nuclear isomers for all the neutron and proton numbers, to highlight the extent of information in this promising and highly interesting field. The total number of nuclear isomers for the complete mass region has been found to be about 2252 including 507 nuclei having only one known isomer and 559 nuclei having isomers between 2 and 5. Nuclear isomers have been found all over the nuclear chart, the largest number being near the magic numbers and gap. It was interesting to find {sup 180}Ta to have the largest number (13) of isomeric states. {sup 179,177}Ta, {sup 152}Eu, {sup 214}Rn were found to have 10 isomeric states each. A theoretical estimation of the half-lives of transitions was made using the Weisskopff single particle estimates which were then compared to the experimental half-lives. The number of isomers is found to be highest in the range 1 ns-100 ns. The number falls gradually with the increase in half-life of the isomeric states up to 0.1s and then a small rise being observed at 10s-10{sup 3}s. The detailed results and findings have been presented in the conferences listed below. (1) Atlas of Nuclear Isomers and their Systematics, A.K. Jain, Talk delivered at Argonne National Lab, USA during a visit in August 2012. (2) Atlas of Nuclear Isomers and Spin Systematics, A.K. Jain, Invited talk in the BRNS workshop on Evaluation of Nuclear Structure and Decay Data, November 26-29, 2012, VECC, Kolkata. We have studied/developed a global systematics of the spins (total angular momentum) of nuclear isomeric states for nuclei in the whole mass region from A=1 to 240. Systematics of spins have been made region wise for a) Z(28-50) and N(28-50), b) Z(50-82) and N(50-82), and c) Z(50-82) and N(82-126). We observe that nuclear isomers having half-integer spins are more in number as compared to nuclei having integral spins for spins less than 6 to 6.5 h. This pattern changes its signature after 6.5 h where we find integral spins lying at the peaks between 6 to 10.5 h. Also, the high spin isomers are more likely in even-even or, in odd-odd nuclei which probably happens because higher spin excitations lie closer to the ground state in these nuclei. A maximum number of high spin isomers was observed at spin values 5.5, 6, 7 and 10h. A further up-gradation of the Atlas of isomers is being carried out to include the newly identified isomers and other new information. While updating the data from ENSDF and NUBASE 2012, we found some isomeric states which are having a longer half-life than their corresponding ground state in this region particular in higher mass neutron rich region. The chart of nuclear isomers based on the experimental data shows a significant gap in this region which motivates us to visit this region for the search of new isomers. We plan to study the following in the actinide region and beyond: (a) Fission isomers having half-life greater than 100ns (b) Rest of isomers having half-life greater than 100 ns (c) Fission isomers having half-life in the range of 1 ns- 100 ns.}
place = {IAEA}
year = {2013}
month = {Aug}
}