A new isomer - 84-MIN 132mI

INORG.

NUCL.

CHEM. LETTERS

Vol. 9,

pp. 1057-1060,

A NEW ISOMER

1973. Pergamon

- 84-MIN

Press. Printed

in

Great Britain.

132mi

v j M. D i k s i c a n d L. Y a f f e Department

of Chemistry,

McGill

Quebec,

University,

Montreal,

Canada

( R e c e i v e d 8 June 1973)

The

84+2 m i n i s o m e r

product

produced

fission

of u r a n i u m

45-MeV

independently

Decay

132gi (865)

(1,2),

The

(6,7,8).

has b e e n

found

states

of a m e t a s t a b l e

circulating well-defined

in this

of the i s o m e r s communication

isomer

I n the first metal

been found

However,

foil

between

intensively

(9.2 min)

no i s o m e r i c the e n e r g y

and transition

levels

of

briefly

the d i s c o v e r y

naturally-oc~urring were

irradiated

synchrocyclotron range

f r o m the target

purified,

83 sec,

132gi.

in the e n e r g y

extracted

of 130I

has b e e n observed.

nitrate

b e a m of the M c G i l l

chemically

to

i n 132Xe.

(48 sec,

case,

set of e x p e r i m e n t s

energies

the d e c a y

transition

states

reports

of 2 . 3 - h r

or uranyl

from

with

have b e e n known f o r some t i m e .

a/Id no d i f f e r e n c e

The present

products,

(3,4,5)

in 1361 has also

the ground

isomeric

metastable

proton

(~,pn)132I

is not p r o d u c e d

by a 98-keV

long-lived

i00 sec)

uranium

isomer

130Te

and by {3- d e c a y (14~) to l e v e l s

134I ( 3 . 5 6 min)

Isomerism

in the m e d i u m - e n e r g y

in the r e a c t i o n

occurs

Relatively

was

and

~-particles.

of 132Te.

132mi has b e e n found as a f i s s i o n

at v a r i o u s

35-85 MeV. and o t h e r

and the V - r a d i a t i o n s

1057

in the

Iodine

fission measured

I0~

A NEW ISOMER

w i t h a 30 - cc Ge(Li) height

analyser.

No y - r a y s , iodine

Samples

which

isotope,

were

(9,10)

In

the target,

iodine was on AgBr.

detector

coupled

chemical

separation

The enriched

130Te

to p r o d u c e

to a 4 0 9 6 - c h a n n e l technique

using heterogeneous

analyser.

for this

involved

National

1 35 02~~ e ~t, p n )

x-radiation

measured

as p r e v i o u s l y

peak area

to give

third-degree calibration

the net a r e a

polynomial curve.

The d e c a y Hamilton

et al.

viz.

175,

539,

132mXe with

We

code

(12,13,14)

a

are g r a t e f u l

for m a k i n g

this

and

described.

was

subtracted

f r o m the total peak.

A

curves w e r e

resolved

b y use

(ii).

obtained

not

(15),

doing

BergstrSm

G. F r i e d l a n d e r

irradiation

possible.

product

on-line

1 354Ae 2~ assigned

found by Hamilton

of 8.4 ms.

to Dr.

documented.

132I as a d a u g h t e r

et al.

1 352xe 0 ~ (u,2n)

and 600 keV, half-life

cyclotron*

and Y-radiation

of the f u l l - e n e r g y

Brinkmann

of the r e a c t i o n

of

T h e i o d i n e was

scheme of 132Xe has b e e n well

f r o m 7 8 - h o u r 132Te. s%udies

the i r r a d i a t i o n

f u n c t i o n was u s e d as a n e m e r g y -

The decay

of the C L S Q c o m p u t e r

sample m i n i m i z e d

Laboratory

132T 53 ± .

after irradiation,

background

The

in iodine.

purified

straight-line

and x-rays

pulse-height

extensively

A

a n d the

cc Ge(Li)

x-rays

in the B r o o k h a v e n

separation

w i t h a 0.5

adopted

set of e x p e r i m e n t s

the r e a c t i o n

to the

low-energy~-rays

of f l u o r e s c e n t

third

set of e x p e r i m e n t s ,

c a r r i e r w a s added,

separated

The

to the d e c a y of a n

in contrast

no iodine

pulse-

for a 2 4 - h o u r period.

the s e c o n d

e m i t t e d by the s a m p l e s w e r e m e a s u r e d

the p r o d u c t i o n

to a 4 0 9 6 - c h a n n e l

were measured

found.

described

fission-produced exchange

coupled

could n o t be a t t r i b u t e d

u r a n y l n i t r a t e was previously

detector

Vol. 9, No. 10

3 Y-rays, et al.,

et al.

and h i s

to

(16)

colleagues

Vol. 9, Me. 10

A NEW ISOMER

confirmed

theseS-rays

when studying

10~9

the same n u c l e a r r e a c t i o n

as p a r t of the 132Xe d e c a y scheme. W e h a v e o b s e r v e d growth in all of the p r o m i n e n t energy p e a k s of 132Xe.

These

component w i t h a h a l f - l i f e

showed the p r e s e n c e

of 84~2 minutes.

full-

of a

I n addition,

lines

at 98_+2,175±1, and 600+--1 k e V d e c a y e d p u r e l y w i t h the 84-minute half-life

of the isomer.

transitions

between

the 2216

levels r e s p e c t i v e l y of 132gi.

The lines at 175 and 600 k e V are

(15).

(7-)and

2041

(5-) and 1441

T h e s e are not p o p u l a t e d

in the d e c a y

The 98-keY line d o e s not fit b e t w e e n any k n o w n

levels and it is p r o p o s e d from 132mi ---) 132gi.

that it is the isomeric

transition

In a d d i t i o n we h a v e o b s e r v e d a very

w e a k 7 7 - k e Y ~ - r a y w l~ch may be the h i g h l y - c o n v e r t e d between

transition

the 2041 and 1963 levels.

A n iodine after

(4+)

simple s e p a r a t e d

irradiation

component.

This

from its 132Te parent 24 h o u r s

showed no evidence of the 8 4 - m i n u t e 1 3 2 m I is s i m i l a r to 134mi w h e r e no f e e d i n g occurs

(5) f r o m the d e c a y of 134Te. It is p r o p o s e d angular momentum

that the isomer decays from a h i g h

state

Preliminary

(perhaps

calculations

decays b y isomeric

transition

~- d e c a y to levels

in 132Xe.

8- by a n a l o g y w i t h 1 3 4 ~ ) . show that 8622 p e r c e n t

to 13~gI,

of 132mi

and 14±2 percent by

A d e t a i l e d d e c a y scheme is in preparation.

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