THE CALCULATIONS FOR DETERMINATION OF THE AGE OF SUPERNOVA REMNANTS AND GALAXY CLUSTERS BY MEASUREMENTS OF HYPERFINE SPLITTING IN HIGHLY IONIZED ATOMS WITH UNSTABLE NUCLEI

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THE CALCULATIONS FOR DETERMINATION OF THE AGE OF SUPERNOVA REMNANTS AND GALAXY CLUSTERS BY MEASUREMENTS OF

HYPERFINE SPLITTING IN HIGHLY IONIZED ATOMS WITH UNSTABLE NUCLEI

I. Band, M. Listengarten, M. Trzhaskovskaya

To cite this version:

I. Band, M. Listengarten, M. Trzhaskovskaya. THE CALCULATIONS FOR DETERMINATION OF THE AGE OF SUPERNOVA REMNANTS AND GALAXY CLUSTERS BY MEASUREMENTS OF HYPERFINE SPLITTING IN HIGHLY IONIZED ATOMS WITH UNSTABLE NUCLEI. Journal de Physique Colloques, 1988, 49 (C1), pp.C1-127-C1-127. �10.1051/jphyscol:1988127�. �jpa-00227447�

JOURNAL DE PHYSIQUE

Colloque C1, Supplt5ment au n03, Tome 49, Mars 1988

THE CALCULATIONS FOR DETERMINATION OF THE AGE OF SUPERNOVA REMNANTS AND GALAXY CLUSTERS BY MEASUREMENTS OF HYPERFINE SPLITTING IN HIGHLY IONIZED ATOMS WITH UNSTABLE NUCLEI

I.M. BAND, M.A. LISTENGARTEN and M.B. TRZHASKOVSKAYA Institute for Physics, St Peterhof, Leningrad State University, Leningrad 198904, USSR

The possibility of using the transitions between HFS components of atoms w i t h nonstable nuclei i n the spectra of hot gas i n the supernova remnants and galaxy clusters for obtaining the information on the age of the objects was mentioned i n / I / without calculations. Here we present the numerical results for some ionized atoms obtained by relastivistic Hartree-Fock-Dirac method. Fermi distribution of nuclear charge density, vacuum polarisation, electron anomalous magnetic moment and reduced mass were taken into account. The HFS energy levels can be w r i t t e n as

€ 4 1 /2)A(F(F+ 1)-J(J+ 1)-1(1+ 111,

where A=A'(p/J). HFS constants A' i n millielectronvol t s for H- Li- and Na-like ions of unstable isotops w i t h well known magnetic moments w i t h Z < 53 are given i n the table (abundance rapidly decreases w i t h increasing of 2). For the s-electrons , wavelength A= (hcJ)/(A'b(J+( 1 / 2 ) ) ) ; J i s the nuclear spin, hc= 1,23985.1 ~ - ~ e v . c m TI 12 i s the halflife.

Standard deviation i s given i n parentheses. The influence of choice of parameters of nuclear charge and magnetisation distribution over the nuclear volume was also investigated.

H - l i k e atom ) ~ i - l i k e atom

4 1 ~ a 7/2 -1,5946(1) 8,670 0,7847(7).

991'c 9/2 5,682(7) 96.510,02034(1) 3.10~ 3 6 ~ 1 2 1,28541(5) 5,281 1,461(1)

1.6.10~ 12'1 7/2 2,620(2) 195,8 0,02114(2) 25,2e 0,1636(1) 1.3.10~ 4 a ~ 4 -1,2980(1) 7,412 1,146(1) 0,7791 10,896(1) 4,e.1010 B 7 ~ b 3/2 2,751816(2) 59.16 k,05712(1) 7.054 0.4790(1)

1. Sunjaev R. A. and Churasov E. M. - Preprint IKI AN USSR, NA910, Moscow, 1984.

2. Band 1. M. , Listengarden M. A. and Trzhaskovskaya M.

B.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1988127