No. 8 (00075)

Family name : Varlamov
Given name : Vladimir
Affiliation : Russian Federation
Abbreviation : RF
E-mail address : Varlamov@depni.sinp.msu.ru
Title : EXPERIMENTAL COMPLEMENTARY DATA USING AS A METHOD FOR GETTING
        MORE ACCURATE INFORMATION 
Authors : I.N.Boboshin, V.V.Varlamov
Abstract : 
EXPERIMENTAL COMPLEMENTARY DATA USING AS
A METHOD FOR GETTING MORE ACCURATE INFORMATION

I.N.Boboshin, V.V.Varlamov

Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State
University, Moscow 119992, Russia

The methods of the extracting of the physical information from data of
any experiment are based usually on using relationships of a definite
degree of generalization. If it is possible to connect data of two or
more experiments using more general relations than those used for data
extracting from experiments it means that one has a group of
complementary experiments. The connecting each other of the
complementary experimental data can help to overcome certain limitation
of information typical to the data obtained in ordinary way. Really it
means a removing from the data a systematic deviations caused by assumed
model dependence.  The experiments of the pick-up and stripping on the
same initial nucleus present an example of the complementary pair
concerns. The values of the nuclear levels spectroscopic factors (SF)
can be obtained from these experiments by taking into account the
definite view of the nuclear potential in target nucleus and
nucleon-nucleus interaction for incident nucleus. Meanwhile, one can
connect sums of the SF obtained from these two types experiments using
the quantum mechanics relationships only /1/ without taking into account
concrete type of nuclear interaction. The usage of the relations between
those SF sums allows one to obtain more realistic normalization of the
SF and to make definite conclusions on total momentum transferred for
each SF. As a result, information evaluated becomes more accurate not in
a statistical meaning only, but in more general meaning also: physical
information becomes more put in accordance to the objective reality. 

The stated ideas /2/ underlie to the base of the computing codes ARES.
These codes were applied for analysis of the stripping and pick-up data
on the nuclei of 40,42,44,46,48Ca, 46,48,50Ti, 50,52,54Cr, 54,56,58Fe,
58,60,62,64Ni, 64,66,68,70Zn, 90,92,94,96Zr, and 116,118,120Sn.
Single-particle energies and nucleon occupation probabilities data for
both neutron and proton subshells were evaluated for each of nuclei
mentioned. The noticeable rising of information accuracy allowed us to
observe for the first time some effects related with the single-particle
motion. 

As examples of new results obtained by connecting of two experiments
data on the base of more general relations the following two could be
presented. One is explanation of well-known experimental abnormal values
of K isotopes ground state spin value sequence: though for 39,41,43,35K
Jp = 3/2+, that for 47K is equal to 1/2+. Using our treatment it was
shown that this is due to inverse position of appropriate proton orbits:
in accordance with traditional nuclear shell-model in 40,42,44,46Ca
1d3/2 orbit lies higher than 2s1/2, but in 48Ca – vice versa,
lower. Another one is discovering of appearing well separated neutron
2d5/2 shell in 96Zr in contradiction to the situation for other Zr
isotopes where 2d5/2 orbit is a part of other shell. This explains
abnormally high energy of first collective 2+ excitation of 96Zr (Z =
40, N = 56). In a definite sense this fact makes possible to interpret
the number 56 looks like magic one.

Research was carried out at the Centre for Photonuclear Experiments Data
(MSU SINP Department of Electromagnetic Processes and Atomic Nuclei
Interaction) and supported in part by the President of Russia Federation
grant N SS-1619.2003.2 and the RBFR grant N 03-07-90431. 

1. C.F.Clement. Nucl.Phys., A213 (1973) 469.
2. I.N.Boboshin, V.V.Varlamov, B.S.Ishkhanov, I.M.Kapitonov. Nucl.Phys.,
   A496 (1989) 93.