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Lifetime measurements of the excited states in {sup 145} Sm

Abstract

Lifetime of the excited levels in {sup 145} Sm has been measured through the {sup 139} La ({sup 10} B, 4 n){sup 145} Sm nuclear reaction. The optimal beam energy of 49 MeV was determined from the measurements of the excitation function and Cascade program. With the possibility of studying lifetime of this nucleus a conventional plunger system have been designed and constructed at kyushu University tandem accelerator laboratory. A La target of 0.22 mg/cm{sup 2} thickness which was evaporated onto a Au foil of 2 mg/cm{sup 2} thickness was used. Since the recoil velocity was estimated to be 1.76 mm/ns (beta 0.00585), the measurable time range resulted in the range from 5 Ps to 5 ns. The single spectra measurements were performed at the 20 plunger positions in the range from 10 {mu} to 10 mm. Analyses of the data were carried using hypermet and/or GF2 program to obtain the lifetimes. A new list of lifetimes for 12 excited states up to 3.922 MeV excitations for {sup 145} Sm were determined for the first time. Decay curves of the these transitions are discussed. The new lifetimes of excited states in {sup 145} Sm enabled us to understand the electromagnetic  More>>
Authors:
El-Badry, A M; Abdel Samie, Sh; Ahmad, A A; [1]  Kuroyanagi, T; Odahara, A; Gono, Y; Morinobu, S [2] 
  1. Depatment of Physics, Faculty of Science, ElMinia University, ElMinia, (Egypt)
  2. Tandem Accelerator Laboratory, Department of Physics, Kyushu University, (Japan)
Publication Date:
Dec 31, 1996
Product Type:
Miscellaneous
Report Number:
INIS-EG-006; CONF-9611191-
Reference Number:
SCA: 663220; 664400; PA: AIX-28:060350; EDB-97:122651; SN: 97001844987
Resource Relation:
Conference: 3. radiation physics conference, Cairo (Egypt), 13-17 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the third Radiation Physics Conference. Vol. 2; Gomaa, M.A.; El-Behay, A.Z.; Hassib, G.M.; El-Naggar, A.M. [eds.]; PB: 419 p.
Subject:
66 PHYSICS; SAMARIUM 145; EXCITED STATES; LIFETIME; BORON 10 REACTIONS; CHARGE PLUNGER METHOD; DECAY; ENERGY-LEVEL TRANSITIONS; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; LANTHANUM 139 TARGET; MEASURING METHODS; RECOILS; VELOCITY
OSTI ID:
521450
Research Organizations:
Atomic Energy Establishment, Cairo (Egypt)
Country of Origin:
Egypt
Language:
English
Other Identifying Numbers:
Other: ON: DE97639681; TRN: EG9700122060350
Availability:
INIS; OSTI as DE97639681
Submitting Site:
INIS
Size:
pp. 263-271
Announcement Date:

Citation Formats

El-Badry, A M, Abdel Samie, Sh, Ahmad, A A, Kuroyanagi, T, Odahara, A, Gono, Y, and Morinobu, S. Lifetime measurements of the excited states in {sup 145} Sm. Egypt: N. p., 1996. Web.
El-Badry, A M, Abdel Samie, Sh, Ahmad, A A, Kuroyanagi, T, Odahara, A, Gono, Y, & Morinobu, S. Lifetime measurements of the excited states in {sup 145} Sm. Egypt.
El-Badry, A M, Abdel Samie, Sh, Ahmad, A A, Kuroyanagi, T, Odahara, A, Gono, Y, and Morinobu, S. 1996. "Lifetime measurements of the excited states in {sup 145} Sm." Egypt.
@misc{etde_521450,
title = {Lifetime measurements of the excited states in {sup 145} Sm}
author = {El-Badry, A M, Abdel Samie, Sh, Ahmad, A A, Kuroyanagi, T, Odahara, A, Gono, Y, and Morinobu, S}
abstractNote = {Lifetime of the excited levels in {sup 145} Sm has been measured through the {sup 139} La ({sup 10} B, 4 n){sup 145} Sm nuclear reaction. The optimal beam energy of 49 MeV was determined from the measurements of the excitation function and Cascade program. With the possibility of studying lifetime of this nucleus a conventional plunger system have been designed and constructed at kyushu University tandem accelerator laboratory. A La target of 0.22 mg/cm{sup 2} thickness which was evaporated onto a Au foil of 2 mg/cm{sup 2} thickness was used. Since the recoil velocity was estimated to be 1.76 mm/ns (beta 0.00585), the measurable time range resulted in the range from 5 Ps to 5 ns. The single spectra measurements were performed at the 20 plunger positions in the range from 10 {mu} to 10 mm. Analyses of the data were carried using hypermet and/or GF2 program to obtain the lifetimes. A new list of lifetimes for 12 excited states up to 3.922 MeV excitations for {sup 145} Sm were determined for the first time. Decay curves of the these transitions are discussed. The new lifetimes of excited states in {sup 145} Sm enabled us to understand the electromagnetic properties. The deduced transition probabilities were established and compared with that of N = 83 isotones and the closed shell nucleus {sup 144} Sm. In addition, a nuclear structure of {sup 145} Sm have been discussed and proposed in framework of the shell model. 4 figs., 1 tab.}
place = {Egypt}
year = {1996}
month = {Dec}
}