Decay properties of heavy mendelevium isotopes

doi:10.1016/0375-9474(93)90010-U

Nuclear Physics A

Volume 563, Issue 1, 11 October 1993, Pages 21-73

https://doi.org/10.1016/0375-9474(93)90010-U Get rights and content

Abstract

We investigated the nuclear properties of several mendelevium isotopes produced in the reactions of heavy ions with ²⁴⁵Es^g. We measured the alpha particles, spontaneous fissions (SF), and photons emitted by counting samples resulting from chemical and/or mass separations. The ²⁵⁶Md half-life is (78.1 ± 1.8) min; it decays primarily by electron capture (EC), but also by alpha emission (11 ± 3)% of the time. The ²⁵⁶Md ground state has J ⩽ 2 (probably J^π = 1⁻), and a mass excess of (87.611 ± 0.053) MeV. The ²⁵⁷Md half-life is (5.523 ± 0.050) h; it decays primarily by EC, but also by alpha emission (15.2 ± 2.6)% of the time and by SF less than 1% of the time. The ²⁵⁶Md mass excess is (88.989 ± 0.003) MeV. The ²⁵⁸Md^g (J^π = 8⁻) half-life is (51.50 ± 0.29) d. It decays by alpha emission; the sum of SF, EC, and β⁻ decay branches is less than 3 × 10⁻³ %. The alpha decay of ²⁵⁸Md^g populates ²⁵⁴Es^m (0.60 ± 0.08)% of the time. The ²⁵⁶Md^g mass excess is (91.691 ± 0.007) MeV. The half-life of $J^{π} = 1^{−}^{258} Md^{m}$ is (57.0 ± 0.9) min. It decays by EC; the branch for decay by alpha emission is less than 1.2%. The sum of SF and β⁻ decay branches is less than 30%. The half-life of ²⁵⁹Md is (1.60 ± 0.06) h; it decays primarily by SF. The alpha decay branch of ²⁵⁹Md is less than 1.3%. From the ²⁵⁹Md half-life we calculated a SF hindrance factor associated with the $72^{−} [514]$ proton configuration of 3.6 × 10⁶. From our data we proposed partial level schemes for ²⁵²Es, ²⁵³Es, and ²⁵⁴Es.

References (130)

M. Schädel et al.
J. Less-Common Metals
(1986)
R.W. Lougheed et al.
J. Less-Common Metals
(1986)
E.K. Hulet et al.
J. Less-Common Metals
(1986)
G.F. Knoll
Radiation detection and measurement
I. Ahmad et al.
Nucl. Phys.
(1984)
I. Ahmad et al.
Nucl. Phys.
(1975)
W. Stoeffl, LLNL Nuclear Chemistry Division, private communication...
A. Ghiorso et al.
Phys. Rev.
(1955)
R.W. Hoff et al.
Nucl. Phys.
(1971)
Y.A. Ellis et al.
Nucl. Data Sheets
(1969)

K. Eskola et al.

Phys. Rev.

(1971)

P.R. Fields et al.

Nucl. Phys.

(1967)

J. Unik et al.

Nucl. Phys.

(1962)

P.R. Fields et al.

Nucl. Phys.

(1973)

E.N. Shurshikov et al.

Nucl. Data Sheets

(1985)

E.N. Shurshikov

Nucl. Data Sheets

(1986)

R.S. Hager et al.

Nucl. Data Tables

(1968)

W.J. Price

Nuclear radiation detection

C.E. Bemis et al.

Phys. Rev. Lett.

(1977)

S.I. Salem et al.

At. Data Nucl. Data Tables

(1974)

J.H. Scofield

At. Data Nucl. Data Tables

(1974)

A. Wapstra et al.

G. Friedlander et al.

Nuclear and radiochemistrv

J.O. Rasmussen

Alpha-, beta- and gamma-ray spectroscopy

J.F. Wild et al.

J. Inorg. Nucl. Chem.

(1973)

F. Asaro et al.

Phys. Rev.

(1964)

H.V. Klapdor et al.

At. Data Nucl. Data Tables

(1984)

N.N. Kolesnikov et al.

K.J. Moody

Nuclear Chemistry Division FY1988 Annual Report

Lawrence Livermore National Laboratory report UCAR 10062-88

(1988)

M.R. Schmorak

Nucl. Data Sheets

(1976)

P. Marmier et al.

L. Phillips et al.

J. Inorg. Nucl. Chem.

(1963)

C.E. Bemis et al.

Nucl. Phys.

(1968)

E.K. Hulet et al.

Phys. Rev. Lett.

(1971)

L.S. Goodman et al.

Phys. Rev.

(1975)

M. Schädel et al.

Phys. Rev.

(1986)

K.J. Moody et al.

Phys.Rev.

(1990)

J.F. Wild et al.

LLNL Nuclear Chemistry Division Annual Report FY83

Lawrence Livermore National Laboratory Report UCAR 10062-83/1

(1983)

D. Lee et al.

Phys.Rev.

(1982)

D. Lee et al.

Phys.Rev.

(1983)

K.J. Moody et al.

Phys. Rev.

(1986)

R.W. Lougheed et al.

LLNL Nuclear Chemistry Division FY87 Annual Report

Lawrence Livennore National Laboratory Report UCAR 10062/87

(1987)

E.K. Hulet et al.

Phys. Rev. Lett.

(1986)

E.K. Hulet et al.

Phys. Rev.

(1989)

J.F. Wild et al.

Phys.Rev.

(1990)

R.W. Lougheed et al.

Phys. Rev. C

(1992)

W.U. Schroeder et al.

Annu. Rev. Nucl. Sci.

(1977)

A. Gobbi

Nucl. Phys.

(1981)

A. Rytz

At. Data Nucl. Data Tables

(1973)

R. Gunnink et al.

Computerized quantitative analysis by gamma rays

Lawrence Livermore National Laboratory Report UCRL-51061

(1972)

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¹: Present address. Chemistry Department, Brookhaven National Laboratory, Upton, NY, USA.

²: Gesellschaft für Schwerionenforschung, Darmstadt, Germany.

³: Oak Ridge National Laboratory, Oak Ridge, TN, USA.

^†: Bethune-Cookman College, Daytona Beach, FL, USA; deceased.

View full text

Decay properties of heavy mendelevium isotopes

Abstract

J. Less-Common Metals

J. Less-Common Metals

J. Less-Common Metals

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Nucl. Data Sheets

Phys. Rev.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Data Sheets

Nucl. Data Sheets

Nucl. Data Tables

Phys. Rev. Lett.

At. Data Nucl. Data Tables

At. Data Nucl. Data Tables

J. Inorg. Nucl. Chem.

Phys. Rev.

At. Data Nucl. Data Tables

Lawrence Livermore National Laboratory report UCAR 10062-88

Nucl. Data Sheets

J. Inorg. Nucl. Chem.

Nucl. Phys.

Phys. Rev. Lett.

Phys. Rev.

Phys. Rev.

Phys.Rev.

LLNL Nuclear Chemistry Division Annual Report FY83

Lawrence Livermore National Laboratory Report UCAR 10062-83/1

Phys.Rev.

Phys.Rev.

Phys. Rev.

LLNL Nuclear Chemistry Division FY87 Annual Report

Lawrence Livennore National Laboratory Report UCAR 10062/87

Phys. Rev. Lett.

Phys. Rev.

Phys.Rev.

Phys. Rev. C

Annu. Rev. Nucl. Sci.

Nucl. Phys.

At. Data Nucl. Data Tables

Computerized quantitative analysis by gamma rays

Lawrence Livermore National Laboratory Report UCRL-51061