Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.
Abstract
The isotopes {sup 255}Md and {sup 256}Md were produced by the irradiation of {sup 253}Es with 35-45 MeV {alpha} particles by ({alpha},n) and ({alpha},2n) reactions and were removed from the target by a helium jet system. {alpha}, {gamma}, and {alpha}-{gamma} coincidence spectra were measured with Si and Ge(Li) detectors. From the EC decays of {sup 255}Md and {sup 256}Md, levels in {sup 255}Fm and {sup 256}Fm were deduced. Favored {alpha} decay of {sup 255}Md was found to populate the 7/2{sup -}[514] single-particle state in {sup 251}Es, thus establishing the 7/2{sup -}[514] as the {sup 255}Md ground state. Several {gamma} rays were observed in the {sub 256}Md {alpha}-{gamma} coincidence spectrum. {sup 256}Fm is the heaviest nucleus in which excited intrinsic states have been identified.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 942765
- Report Number(s):
- ANL/PHY/JA-34385
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US0904225
- DOE Contract Number:
- DE-AC02-06CH11357
- Resource Type:
- Journal Article
- Journal Name:
- Phys. Rev. C
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 044301 ; 2000; Journal ID: ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; EINSTEINIUM 253; GROUND STATES; HELIUM; IRRADIATION; ISOTOPES; JETS; LEVELS; LI-DRIFTED GE DETECTORS; MENDELEVIUM 255; MENDELEVIUM 256; NEUTRONS; PARTICLES; SPECTRA; TARGETS
Citation Formats
Ahmad, I, Chasman, R R, and Fields, P R. Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.. United States: N. p., 2000.
Web.
Ahmad, I, Chasman, R R, & Fields, P R. Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.. United States.
Ahmad, I, Chasman, R R, and Fields, P R. 2000.
"Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.". United States.
@article{osti_942765,
title = {Spectroscopic studies beyond N = 152 neutron gap : decay of {sup 255 ovr sub 101}Md and {sup 256 ovr sub 101}Md.},
author = {Ahmad, I and Chasman, R R and Fields, P R},
abstractNote = {The isotopes {sup 255}Md and {sup 256}Md were produced by the irradiation of {sup 253}Es with 35-45 MeV {alpha} particles by ({alpha},n) and ({alpha},2n) reactions and were removed from the target by a helium jet system. {alpha}, {gamma}, and {alpha}-{gamma} coincidence spectra were measured with Si and Ge(Li) detectors. From the EC decays of {sup 255}Md and {sup 256}Md, levels in {sup 255}Fm and {sup 256}Fm were deduced. Favored {alpha} decay of {sup 255}Md was found to populate the 7/2{sup -}[514] single-particle state in {sup 251}Es, thus establishing the 7/2{sup -}[514] as the {sup 255}Md ground state. Several {gamma} rays were observed in the {sub 256}Md {alpha}-{gamma} coincidence spectrum. {sup 256}Fm is the heaviest nucleus in which excited intrinsic states have been identified.},
doi = {},
url = {https://www.osti.gov/biblio/942765},
journal = {Phys. Rev. C},
issn = {0556-2813},
number = 044301 ; 2000,
volume = 61,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 2000},
month = {Sat Jan 01 00:00:00 EST 2000}
}