126 Te { ¿ ?8 ý P c p  Ò Å Ä Z Ø° Ë Ñ] K ¡ Ž ì ŏ Œ

 12 Z 4, pp. 1257∼1261

126 Te { ¿ ?8 ý P c p  Ò Å Ä Z Ø° Ë Ñ] K ¡ Ž ì ŏ Œ

' Ö <‡ ç ¡( 8 

 

ñ" f@ /† < Ɠ § n Û ¼e  ¦ Y Us / B N † < Æõ ,  í ß – 336-795

(2010¸   10 Z 4 19{ 9  ~ à Î6 £ §, 2010¸   11 Z 4 2{ 9  à º& ñ ‘ : r ~ à Î6 £ §, 2010¸   12 Z 4 10{ 9  > F  S X ‰& ñ )

Ù þ

˜Ö 6 x ½ + Ë-7 £ x µ 1 Ï

¹²⁴

Sn (

⁷

Li, p4n)

¹²⁶

Te ì ø Í6 £ x`  ¦ : Ÿ x # Œ

¹²⁶

Te _  [ þ t> p u  © œI [ þ t s  y Œ ™ ‚   ì  rF  g † < Æ\  _ K 

›

¸ ÷ &% 3  .  6   x ) a c ”  \  -t   H 50 MeV s % 3  . [ þ t> p u \  -t  2974 keVs  9 Û ¼— 2 ;-ì ø ̈́  $ í s  J

^π

= 10

⁺

ï  r 0 A  H  s ™ è Qe ” s  S X ‰ “  ÷ &% 3 “ ¦ 8 £ ¤& ñ  ) a ì ø Íy Œ ™l   H T

_1/2

= 13.6(4)ns s % 3  . Õ ªo “ ¦ ‘ : r ƒ  ½ ¨\  ¦ :

Ÿ

x # ΠJ

^π

= 10

⁺

s  © œ_  “ ¦Û ¼— 2 ;  © œI [ þ t s  % ƒ6 £ § Ü ¼– Ð µ 1 Ï| ÷ &% 3  . Te 1 l x 0 A" é ¶ ™ è[ þ t õ  Sn Ù þ ˜[ þ t _  ï  r 0 A[ þ t

\

 @ /ô  Ç ^ ‰> $ í ì  r$ 3   õ  J

^π

= 10

⁺

  H ×  æ$ í   g Ë >{ 9 C • ¸“   h

_11/2

\  _ ô  Ç ¿ º×  æ$ í     ½ + Ë, 7 £ ¤ ν(h

_11/2

)

²

C

0 A\    É r [ þ t> p u  © œI – Ð [ O " î ÷ &% 3  . s ü < ì ø ̀  \  J

^π

= 8

⁺

  H ¿ º> h_  € ª œ$ í   π(g

7/2

)

²

[ þ t> p u s  1-”  1 l x



 7 £ ¤ J

^π

= 2

⁺

\    ½ + ˝ ) a  © œI – Ð K $ 3 ÷ &% 3  . J

^π

= 15

⁺

ï  r 0 A  H Õ ª [ þ t> p u \  -t  5095 keV– Ð \  -t 

^

‰> $ í s  J

^π

= 10

⁺

ü < q 5 p w ô  Ç  ⠆ ¾ Ó`  ¦ ˜ Ð% i  . s   H s  ï  r 0 A h

11/2

C • ¸\  e ”   H ¿ º×  æ$ í  _  [ þ t> p u õ  y

© œ >  ƒ  › ' a ÷ &# Q e ”   H 4-ï  r{ 9   C \ P   © œI e ” `  ¦ ´ ú ˜K ï  r  “ ¦  ’ x .

Ù þ

˜d ” # Q: Ù þ ˜ì ø Í6 £ x

¹²⁴

Sn (

⁷

Li, p4n)

¹²⁶

Te, c ” ¤ èl  y Œ ™ ‚   ì  rF  g † < Æ, Ù þ ˜½ ¨› ¸, | 9 é ß –$ í ”  1 l x { ,  s ™ è Q

Gamma-ray Spectroscopic Study of ¹²⁶ Te

Chang-Bum Moon ^∗

Department of Display Engineering, Hoseo University, Asan 336-795

(Received 19 October, 2010 : revised 2 November, 2010 : accepted 10 December, 2010)

The excited states of the nucleus

¹²⁶

Te have been studied by using in-beam gamma-ray spec- troscopy with the

¹²⁴

Sn (

⁷

Li, p4n)

¹²⁶

Te reaction at E

lab

= 50 MeV. Several states above J

^π

= 10

⁺

have been newly identified. The 10

⁺

state at 2974 keV has been found to be an isomer, and its half- life has been shown to be 13.6(4) ns. The resulting level scheme was interpreted in the framework of energy systematics in comparison with those for neighboring Te isotopes and Tin cores. The J

^π

= 10

⁺

level is consistent with the systematic trend in

^118−124

Te and is, thus, interpreted as being based on the two-quasineutron alignment in the h

11/2

orbital, namely, the ν(h

11/2

)

²

configuration, while the J

^π

= 8

⁺

state can be interpreted as the two-proton π(g

7/2

)

²

orbital coupled to the 2

⁺

phonon state. The J

^π

= 15

⁺

level at 5095 keV was newly identified and is interpreted as being a four-quasiparticle configuration strongly coupled to the ν(h

11/2

)

²

orbital.

PACS numbers: 21.10.Re, 21.60.Ev, 27.60.+j

Keywords: Nuclear reactions

¹²⁴

Sn (

⁷

Li, p4n)

¹²⁶

Te, In-beam gamma ray spectroscopy, Nuclear structure, Vibrational bands, Isomers

∗

E-mail: [email protected]

-1257-

I. " e  ] Ø

"

é

¶      ñ 52  \  K { © œ÷ &  H Te 1 l x 0 A" é ¶ ™ è[ þ t“ É r „  + þ A& h “  

”

 1 l x ½ ¨› ¸\  ¦ ° ú   H  כ Ü ¼– Ð · ú ˜ 94 R e ”  . s  Qô  Ç  ⠆ ¾ ӓ É r € ª œ

$ í

 
 ×  æ$ í    Z O à º (magic number)  – Ð s Ö  © Ù þ ˜\  5

Å

q   H Ù þ ˜[ þ t \ " f ˜ м # & h Ü ¼– Ð
 
  H ‰ & ³ © œs  . € ª œ$ í



 50  “ É r  Z O à º\  K { © œ÷ & 9 ,  | 9  { Œ —g Ë >(shell closure)\ 



 É r % ò † ¾ ÓÜ ¼– Ð [ þ t›  H \  -t   © œI [ þ t _  x 9 • ¸ ± ú “ ¦ “ ¦Û ¼

—

2 ;  © œI [ þ t“ É r ` …Ø Ôp  \  -t    H % ƒ\  K { © œ÷ &  H ï  r{ 9   C 

•

¸\  ” > r F    H Ù þ ˜ [ þ t _  [ þ t> p u \  _ K  ŠҖ Ð µ 1 ÏÒ q t ) a   [1].

s

ü < ì ø ̀  \  s  Qô  Ç  Z O à º\ " f # Á # Q
l  r  Œ • €   ï  r{ 9 



 C \ P \     Ù þ ˜[ þ t s    + þ A`  ¦ { 9 Ü ¼v >  ÷ &  H X < (Nilsson configuration) € ª œ$ í   à º 54  “   Xe Ù þ ˜[ þ t \ " f s p  Õ ª Q ô

 Ç ½ ¨› ¸
 è ß – . 7 £ ¤ ! 3 q / B N — ¸€ ª œ(prolate shape)Ü ¼– Ð



 + þ As  ÷ &€  " f | 9 é ß –& h “   $ í | 9 “    r„   î  r1 l x s 
 è ß – .

Õ

ªo “ ¦ Õ ª ×  æ ç ß –\  e ”   H 52  “   9 \ šÀ Òµ ¢ §(Te) Ù þ ˜[ þ t“ É r | 9 é ß –

&

h “   ”  1 l x î  r1 l x _  5 Å q$ í `  ¦ ”    [2–4]. Fig. 1“ É r € ª œ$ í   Ã

º 50, 52, 54   `  ¦ ° ú “ ¦ ×  æ$ í  à º 74  “   1 l x×  æ" é ¶ ™ è[ þ t \ 

@

/ô  Ç s  Qô  Ç ½ ¨› ¸    o\  ¦ ˜ Ð# ŒÅ ҍ  H Ù þ ˜ï  r 0 A• ¸s  .

ô

 Ǽ #  ,  | 9   Z O à º 50   s  © œ\  e ”   H  ¾ ú   { 9  [ þ t s  [ þ t ä

¼>  ÷ &€   / B Ng 1 J @ /g A_  — ¸€ ª œ`  ¦   + þ Ar v  9  € ª œô  Ç + þ AI  _

 [ þ t> p u  © œI [ þ t s  µ 1 ÏÒ q t >   ) a  . ‹ Œ •Ã º-‹ Œ •Ã º Te Ù þ ˜[ þ t“  

 â

Ä º J ^π = 6 ⁺ , J ^π = 7 ⁻ , J ^π = 10 ⁺ 1 p x _  ï  r 0 A[ þ t s  ^ ‰

>

& h “   € ª œ © œ`  ¦ ˜ Ðs  9 : £ ¤Z > ô  Ç ï  r{ 9  [ þ t _  C \ P \    É r

 כ

Ü ¼– Ð K $ 3 ÷ &# Q t “ ¦ e ”  . s M : s  Qô  Ç ï  r{ 9   C \ P \  e ”

# Q € ª œ$ í    H πg 7/2  Ò,  | 9 s , ×  æ$ í    H νh 11/2  Ò,  | 9  s

 ×  æ כ ¹ô  Ç % i ½ + É`  ¦ { Œ ™{ © œô  Ç . : £ ¤ y  νh 11/2   H ™ è0 A g Ë >{ 9 C 

•

¸ (intruder orbital)\  K { © œ÷ &  H X < ×  æ$ í  à º\  _ ô  Ç { 9 



 ¢ ¸  H ½ ¨" í  © œI [ þ t \     J ^π = 10 ⁺ _  ï  r 0 A $ í | 9 s    Ø

Ô> 
 è ß – . Ä ºo   H ¹²⁴ Te [5] \  s # Q ¹²⁶ Te _  “ ¦Û ¼— 2 ;



© œI \  ¦ › ¸  # Œ 0 Aü < ° ú  “ É r \  -t  ï  r 0 A[ þ t \  @ /ô  Ç ^ ‰> 

$ í

ƒ  ½ ¨ l ì ø Í`  ¦  t “ ¦  ô  Ç .

‘

: r  7 Hë  H \ " f  H ×  æ$ í   à º 74  `  ¦ ° ú   H ¹²⁶ Te _  J ^π = 10 ⁺ ï  r 0 Aü < Õ ª s  © œ_  “ ¦Û ¼— 2 ;  © œI [ þ t _  ½ ¨› ¸\  ¦ ¶ ú ˜( R‘ : r



. ¹²⁶ Te _  “ ¦Û ¼— 2 ;  © œI [ þ t“ É r ¹³⁰ Te + ⁶⁴ Ni ì ø Í6 £ x`  ¦ : Ÿ x 

#

Œ U  ·“ É r q ò ø Í$ í õ & ñ (deep inelastic processes)\  _ K 

ƒ

 ½ ¨  ) a   e ”   [6]. Õ ª Q
 J ^π = 10 ⁺ s  © œ_   © œI ü <

J ^π = 7 ⁻ \  ¦ l ì ø ÍÜ ¼– Ð   H [ þ t›  H  © œI [ þ t“ É r · ú ˜ 9”    

Z >

– Ð \ O   H z  ´& ñ s  .

II. ÷ m Ç] M ö õ m Í + s ÇÊ Ý

126 Te Ù þ ˜_  “ ¦Û ¼— 2 ;  © œI   H ¹²⁴ Sn ( ⁷ Li, p4n) ¹²⁶ Te ì ø Í6 £ x

\

 _ K  › ¸ ÷ &% 3  . o ½ ¢ § c ” “ É r   ñÅ Ò ² D Gw n @ /† < Ɠ §\  [ O u 

Fig. 1. Systematics of the ground band states in ¹²⁴ Sn,

126 Te, and ¹²⁸ Xe with N = 74 isotones. Energies are given in keV.

÷

&# Q e ”   H 14UD Pelletron ò ø Í r 5 Å q l \  ¦  6   x # Œ % 3 % 3  Ü

¼ 9 { 9   \  -t   H 50 MeV s % 3  . z  ´+ « > ~ ½ ÓZ O \  @ /ô  Ç

 כ

“ É r s p  µ 1 ϳ ðô  Ç ¹²⁴ I [7] ü < ¹²³ I [8] \ " f  [ jy   À Ò% 3  l

 M :ë  H \  # Œl \ " f  H Ò q t| Ä Ì l – Ð ô  Ç .

Fig. 2  H ‘ : r z  ´+ « >\ " f % 3 “ É r ¹²⁶ TeÙ þ ˜_  \  -t  ï  r 0 A

•

¸s  . y Œ ™ ‚   „  s [ þ t _  í  H " f  H y Œ ™ -y Œ ™  1 l x r   | 

\

" f % 3 “ É r y Œ ™ ‚  [ þ t _  › ' a > ü < Õ ª [ jl [ þ t`  ¦ q “ § # Œ

% 3

% 3  . Õ ªo “ ¦ Û ¼— 2 ;õ  ì ø ̈́  $ í `  ¦ % 3 l  0 Aô  Ç  ×  æ¼ # F G

•

¸(multipolarity)  H HPGe  Ž Ø  ¦ l [ þ t s  0 Au ô  Ç c ”  “  

\

 @ /ô  Ç  © œ@ / y Œ •• ¸\  _ K  % 3 % 3  . 7 £ ¤ 97 ^◦ ü < 145 ^◦ ( ¢ ¸  H 48 ^◦ ) \  0 Au ô  Ç  Ž Ø  ¦ l [ þ t _  y Œ ™ ‚   [ jl \  ¦ q “ § # Œ % 3 



 H X <, s M : 2 " é ¶ ' Ÿ § > =\  e ” # Q ô  Ç » ¡ ¤ \   H 97 ^◦ \  0 Au  ô

 Ç  Ž Ø  ¦ l [ þ t _  y Œ ™ ‚   X <s ' \  ¦   É r » ¡ ¤ \   H 145 ^◦ <  Ê

“

É r 48 ^◦ \  0 Au ô  Ç  Ž Ø  ¦ l [ þ t _  y Œ ™ ‚   X <s ' \  ¦ $  © œô  Ç .

s

 Qô  Ç q Ö  ¦`  ¦ ˜ Ð: Ÿ x DCO(directional correlation of ori- ented states)    ÒØ Ô 9, R = I γ (145 ^◦ or 48 ^◦ )/I γ (97 ^◦ ) – Ð

³

ðl ô  Ç . s  Qô  Ç ì  r$ 3 “ É r MS Windows x 9  Linux OS



© œ‚ Ã Ì  ) a > h“  6   x ( Ž É Ó' \ " f s À Ò# Q& ’  .

1   {   H  { Œ • © œI \  l ì ø Í`  ¦ é  H [ þ t›  H \  -t  ï  r 0 A[ þ t s  9 ‘ : r z  ´+ « >`  ¦ : Ÿ x # Œ “ ¦Û ¼— 2 ; % ò % i “   J ^π = 14 ⁺ − 15 ⁺ , J ^π

= 9 ⁻ − 13 ⁻ 1 p x _  ï  r 0 A[ þ t s  D h\  v >  µ 1 Ï| ÷ &% 3  . Fig. 3“ É r 666-keV ü < 208-keV „  s ‚  [ þ t \  @ / # Œ > s à Ô\  ¦   # Q Å

Ò% 3 `  ¦ M :
 
  H 1 l x r  y Œ ™ ‚  [ þ t _  Û ¼& 7 ˜à Ô! 3 [ þ t s  .



{ Œ • © œI \  ¦ l & h Ü ¼– Ð   H 1   { _  y Œ ™ ‚  [ þ t s  Ì º§  

>

 ˜ Ðs “ ¦ e ”  . s ü < ì ø ̀  \  2   {   H J ^π = 7 ⁻ \  ¦ r  Œ • Ü

¼– Ð   H 6 £ § _  ì ø ̈́  $ í `  ¦ ° ú   H ½ ¨› ¸s  . Õ ªo “ ¦ 3   { 



 H 1   { ü <  H ¢ ¸   É r € ª œ_  ì ø ̈́  $ í `  ¦ ° ú “ ¦ e ”   H ï  r 0 A[ þ t s

 .

Fig. 2. Level scheme of ¹²⁶ Te as obtained from the

124 Sn( ⁷ Li, p4n) ¹²⁶ Te reaction at E _lab = 50 MeV. Tran- sitions with an asterisk have been newly observed in the present work. The widths of the arrows represent the relative intensities of the transitions. Transition and ex- citation energies are given in keV.

Fig. 3. Representative γ-ray spectra following the

124 Sn( ⁷ Li, p4n) ¹²⁶ Te reaction at 50 MeV when putting gate on the transitions of (a) 666 keV and (b) 208 keV.

Peaks marked by an asterisk indicate contaminants from other nuclei.

ô

 Ǽ #  J ^π = 10 ⁺ ï  r 0 A  H ï  r î ß –& ñ  © œI  7 £ ¤  s ™ è Q (iso-

Fig. 4. Decay time curve and associated with fit show- ing a half-life of 13.3(2) ns for the 208 keV transition following the J ^π = 10 ⁺ isomer.

mer; isomeric state)e ” s  µ 1 ß) €& ’   H X < s \  @ /ô  Ç ì ø Íy Œ ™l 

\

 ¦ 208 keV ü < 415 keV y Œ ™ ‚  _  r ç ß – Ô  æ õ  / B G‚  Ü ¼– РÒ' 

% 3

% 3  . Fig. 4  H J ^π = 10 ⁺ ï  r 0 A\ " f b  # Qt   H 208 keV y

Œ

™ ‚  \  @ /ô  Ç r ç ß – Ô  æ õ  / B G‚  s  . s  Qô  Ç Ô  æ õ \  @ / ô

 Ç s  : r& h  Ô  æ õ  † < Êà º  H Õ ªa Ë >\ " f ˜ Ѝ  H  כ % ƒ! 3  ì ø Íy Œ ™l 

13.3 ns\  ¦ | 9  M :  © œ ¸ ú ˜ { 9 u  % i  . 415 keV_  r ç ß –

†

< Êà º  H 13.9 nse ” `  ¦ ˜ Ð# Œ Å Ò% 3   H X < ¿ º Ô  æ õ  / B G‚  \  @ /ô  Ç

¨ î

ç  H`  ¦ “ ¦ 9 # Œ Ä ºo   H 10 ⁺  s ™ è Q_  ì ø Íy Œ ™l \  ¦ T 1/2

= 13.6 ± 0.4 ns – Ð   & ñ % i  . Ä ºo [ þ t _    õ   H s „      õ

“   10.0 ns [6]ü <  H €  • 1 %_  s \  ¦ ˜ Ðs “ ¦ e ”  .

Ä

ºo  ' Ÿ ô  Ç z  ´+ « >\ " f % 3   H ¹²⁶ TeÙ þ ˜_  “ ¦Û ¼— 2 ; ï  r 0 A[ þ t

\

 @ /ô  Ç y Œ ™ ‚  [ þ t _  \  -t , „  s  [ jl , Û ¼— 2 ;-ì ø ̈́  $ í 1 p x _

 & ñ ˜ Ð\  ¦ Table 1 \  z  ´% 3  .

III. ‚ º  ] Ø

s

p  " f : r \ " f ƒ  / å L`  ¦ ô  Ç  ü < ° ú  s  # Œl " f  À ҍ  H Te Ù þ

˜[ þ t“ É r € ª œ$ í    Z O à º 50  “   Å Ò$ 3 Ù þ ˜_   – Ð s Ö  © Ù þ ˜\  5

Å

q # Œ € ª œ$ í  _  { Œ —˜ 2 ³ ,  | 9 (closed shell) C • ¸\  _ ô  Ç % ò

†

¾ Ós  ß ¼> 
 è ß – . s  Qô  Ç ,  | 9  { Œ —j Ë µ ´ òõ \   8K , ×  æ

$ í

  à º  H N = 60-82 \    5 g e ” # Q ×  æ$ í   ,  | 9  C • ¸[ þ t

`

 ¦ F  g# 3 0 A >  [ þ t # Œ  ^  ¦ à º e ” l  M :ë  H \  ,  | 9  — ¸+ þ A(shell model) _   { © œ$ í \  @ /ô  Ç a % ~“ É r l  r\  ¦ ] j/ B N K  ï  r  . : £ ¤ y  s

 Qô  Ç % ò % i \ " f › ' a d ” `  ¦ ã ¼  H  כ “ É r ×  æ$ í   à º 7 £ x † < Ê

\

    € ª œ$ í   C • ¸[ þ t _  [ þ t> p u  © œI [ þ t _     o\  @ /ô  Ç ^ ‰

>

$ í s  . Fig. 5  H ^118−126 Te 1 l x 0 A" é ¶ ™ è[ þ t \  @ /ô  Ç € ª œ_  ì

ø ̈́  $ í `  ¦ ”   “ ¦Û ¼— 2 ;  © œI [ þ t _  ^ ‰> $ í `  ¦ ˜ Ð# ŒÅ ҍ  H ï  r 0

A• ¸s  .

Ä

ºo   H # Œl " f Û ¼— 2 ;  © œI  8 ⁺ s  © œ_  \  -t  ï  r 0 A[ þ t

“ É

r ×  æ$ í   à º\     ^ ‰> & h “      o µ 1 ÏÒ q tô  Ç   H  z  ´

Table 1. Energies, intensities, excitation energies, and spin-parities of the gamma-ray transitions in ¹²⁶ Te. It should be noted that the intensities are relative to that of the 694.7 keV transition in a coincidence with the 666.2 keV transition. The numbers in parentheses denote the error in the last digit.

E

γ

(keV) I

γ

E

i

→ E

f

(keV) J

_i^π

→ J

f^π

208.4 21.2(6) 2973.6 → 2765.2 10

⁺

→ 8

⁺

414.9 72.8(5) 1775.8 → 1360.9 6

⁺

→ 4

⁺

461.5 1.3(6) 5094.9 → 4533.4 15

⁺

→ 14

⁺

526.7 1.7(5) 5114.3 → 4587.6 → 13

⁻

557.7 2.0(4) 5094.9 →4537.2 15

⁺

→ 14

⁺

571.9 11.3(7) 3765.4 → 3193.5 6

⁺

→ 4

⁺

593.1 2.3(6) 2810.2 → 2217.1 8

⁺

→ 6

⁺

605.2 4.8(5) 3415.4 → 2810.0 → 8

⁺

666.2 gate 666.2 → 0 2

⁺

→ 0

⁺

694.7 100 1360.9 → 666.2 4

⁺

→ 2

⁺

697.2 13.2(12) 3193.5 → 2496.3 9

⁻

→ 7

⁻

713.2 12.6(7) 3686.8 → 2973.6 12

⁺

→ 10

⁺

720.5 20.3(8) 2496.3 → 1776.8 7

⁻

→ 6

⁺

753.8 4.2(9) 1420.0 →666.2 2

⁺

→ 2

⁺

822.2 3.1(9) 4587.6 → 3765.4 13

⁻

→ 11

⁻

850.4 3.3(8) 4537.2 → 3686.8 14

⁺

→ 12

⁺

856.2 6.9(6) 2217.1 → 1360.9 6

⁺

→ 4

⁺

946.6 2.4(10) 4533.4 → 3686.8 14

⁺

→ 12

⁺

898.4 12.6(5) 2765.2 → 1775.8 8

⁺

→ 6

⁺

Fig. 5. Systematics of the excited states in the nuclei

118−126 Te. Transition and excitation energies are given in keV.

`

 ¦ · ú ˜ à º e ”  . s   H / B I ×  æ$ í   h 11/2 g Ë >{ 9 C • ¸\  e ”   H ¿ º

×

 æ$ í   C \ P _     oü < x 9 ] X ô  Ç › ' a > \  ¦ ° ú   H  .

Te (Z = 52) Ù þ ˜[ þ t \ " f € ª œ$ í  _  ` …Ø Ôp  \  -t  ï  r 0

A\   î  r C • ¸[ þ t(orbitals)“ É r d 5/2 , g _7/2 õ  g Ë >{ 9 C 

•

¸(intruder orbital)\  K { © œ÷ &  H 6 £ § _  ì ø ̈́  $ í `  ¦ ° ú   H h _11/2 s  . Õ ªo “ ¦ ×  æ$ í   (N = 74)\  K { © œ÷ &  H C • ¸[ þ t

“

É r s 1/2 , d _3/2 , d _5/2 , g _7/2 õ  h 11/2 1 p x s  . Fig. 5\ " f Ä º‚  

&

h Ü ¼– Ð Å Ò3 l q ÷ &  H  Òì  r s  J ^π = 6 ⁺ ï  r 0 As  .  =
 €   6 ⁺ → 4 ⁺ „  s  \  -t  4 ⁺ → 2 ⁺ → 0 ⁺  ⠆ ¾ Ó\   Ø Ô t

 · ú §“ ¦ J ^π = 6 ⁺ _  [ þ t> p u \  -t  ×  æ$ í   à º\  › ' a > \ O  s

 q 5 p w    H & h s  e ” l  M :ë  H s  .   " f s  ï  r 0 A  H ”   1

l

x  _  [ þ t> p u(7 £ ¤ 3-phonons) \  _ ô  Ç  כ s   m “ ¦ ¿ º> h_ 

€

ª œ$ í   g 7/2 C • ¸\  [ þ t * ‹ Ò q t|    כ s  “ ¦ K $ 3 ÷ &# Q t “ ¦ e ”

 . 7 £ ¤ π(g 7/2 ) ² \  _ K  J ^π = 6 ⁺  + þ A$ í  ) a    H  כ s   [4,5]. s   H Ù þ ˜_  ”  1 l x » ¡ ¤ \  ¿ º € ª œ$ í  _  y Œ •î  r1 l x | ¾ Ós  ¢ - a„   y

 & ñ § > =÷ &# Q { 9 # Qè ß – ‰ & ³ © œs  . s ü < ì ø ̀  \  2217 keV\ 

”

> r F    H ¢ ¸   É r 6 ⁺ ï  r 0 A (Fig. 2\  ¦ ˜ Ð )  H ”  1 l xî  r1 l x \  _

ô  Ç  כ Ü ¼– Ð 3-”  1 l x  (3-phonons) [ þ t> p u _    õ s  . Õ ª o

“ ¦ 1420 keV_  2 ⁺ ï  r 0 A  H 2-”  1 l x   [ þ t> p u ‰ & ³ © œs  . s 



Qô  Ç „  + þ A& h “   ”  1 l x € ª œ © œ“ É r Te Ù þ ˜\ " f ˜ м # & h Ü ¼– Ð
 

 9 s  Qô  Ç › ' a > – Ð l œ í Ù þ ˜Ó ü t o † < Æ “ §F \ • ¸ ˜ Ðl – Ð  



: r ÷ &“ ¦ e ”   [9].



6 £ § Ü ¼– Ð J ^π = 8 ⁺ ï  r 0 A\  ¦ ¶ ú ˜( R˜ Ð . s  ï  r 0 A  H ×  æ$ í



_  à º\   H › ' a > \ O s  # QÖ ¼ & ñ • ¸ { 9 & ñ ô  Ç \  -t   © œI \  ¦ Ä

»t  “ ¦ e ”    H & h s  : £ ¤ s   . Õ ª  X < | 9 | ¾ Óà º 124  õ  126  \ " f_     o\  ¦ ˜ Ѐ    z  ´ © œ J ^π = 2 ⁺ ï  r 0 A    oü <

{ 9

Ð  o © œ: Ÿ x “ ¦ e ” 6 £ §`  ¦ · ú ˜ à º e ”  . s  Qô  Ç € ª œ © œ“ É r s  ï  r 0

A\  @ /ô  Ç ï  r{ 9   ½ ¨› ¸ ¿ º> h_  € ª œ$ í   π(g 7/2 ) ² [ þ t> p u s  1-”  1 l x   7 £ ¤ J ^π = 2 ⁺ \    ½ + ˝ ) a  © œI e ” `  ¦ ´ ú ˜K Šғ ¦ e ”  .



r  ´ ú ˜K " f Û ¼— 2 ;   ½ + Ës  2 ⁺ (1 phonon) ⊗ 6 ⁺ [π(g 7/2 ) ² ] s 



. s ü < ì ø ̀  \  J ^π = 10 ⁺ ï  r 0 A ^ ‰> $ í “ É r s ü <  H ¢ - a„   y

   É r — ¸_ þ v`  ¦ ˜ Ðs “ ¦ e ”  .

Ä

ºo   H Fig. 5 \ " f J ^π = 10 ⁺ ï  r 0 A  H | 9 | ¾ Óà º\     ^ ‰

>

& h Ü ¼– Ð   ô  Ç   H  z  ´`  ¦ · ú ˜ à º e ”  . ¢ ¸ô  Ç Õ ªa Ë >\   H
 ü

< e ” t  · ú §t ë ß – J ^π = 7 ⁻ ï  r 0 A % i r  ×  æ$ í   à º    o\   



 ^ ‰> & h “   — ¸_ þ v`  ¦ ˜ Г   . ¿ º ï  r 0 A\  e ” # Q s  Qô  Ç ^ ‰

>

$ í (systematics)“ É r Sn Ù þ ˜\ " f• ¸ q 5 p w ô  Ç € ª œ © œ`  ¦ ˜ Г   .

Sn Ù þ ˜[ þ t \  e ” # Q s  Qô  Ç ï  r 0 A[ þ t“ É r ì ø Íy Œ ™l  à ºÑ þ ˜ ns\ " f Ã

ºz   µs\  s Ø Ô  H  s ™ è Q  © œI [ þ t`  ¦ s À ҍ  H  כ Ü ¼– Ð · ú ˜



94 R e ”   [1]. Õ ª  X < Te Ù þ ˜[ þ t \  e ” # Q" f• ¸ ¹²⁶ Te \  s Ø Ô



Q" f  H s  Qô  Ç 10 ⁺ ï  r 0 A 10.6 ns_  ì ø Íy Œ ™l \  ¦ ° ú   H   s

™ è Q– Ð ” > r F  >  H † d`  ¦ · ú ˜ à º e ”  . s  Qô  Ç  s ™ è Q  H 8 ⁺ ï  r 0 Aü < 10 ⁺ ï  r 0 Aü <_  ç ß –  s  s „   ¹²⁴ Te Ù þ ˜\ " f q K  F

G • ¸– Ð  Œ • t €  " f „  s  \  -t  ± ú “ É r y Œ ™ ‚  s  µ 1 ÏÒ q t

l  M :ë  H s  .  Ö  ¦  Q | 9 é ß – î  r1 l x \  _ ô  Ç  כ ˜ Ð  ï  r{ 9  

C

\ P \    É r í  H à º ï  r{ 9   [ þ t> p u \  _ ô  Ç \  -t   © œI    H

 כ

`  ¦ ˜ Ð# ŒÅ ғ ¦ e ”  . ,  | 9  — ¸+ þ A_  > í ß –\   Ø Ô€   J ^π = 7 ⁻ ï  r 0 A  H ¿ º> h_  ï  r×  æ$ í     ½ + ˓   ν[d _3/2 h _11/2 ] ₇

−

\  _  ô

 Ç  כ Ü ¼– Ð K $ 3 ÷ & 9 J ^π = 10 ⁺ ï  r 0 A  H ν[(h 11/2 ) ² ] ₁₀

+

C 

\ P

\  _ ô  Ç  כ Ü ¼– Ð K $ 3 ÷ &“ ¦ e ”  .   " f ¹²⁶ Te \ " f ˜ Ð s

  H s  ¿ º ï  r 0 A  H 0 Aü < ° ú  “ É r Sn Ù þ ˜\ " f_  ï  r{ 9   C \ P  õ

 ° ú   “ ¦ ^  ¦ à º e ”  . s  Qô  Ç K $ 3 “ É r   É r  7 Hë  H[ þ t \ " f µ

1 ϳ ðô  Ç K $ 3 [ þ t õ • ¸ { 9 u ô  Ç  [2,5].

2   { _  ½ ¨› ¸\  ¦ ¶ ú ˜( R˜ Ѐ   13 ⁻ → 11 ⁻ → 9 ⁻ → 7 ⁻ _ 

„

 s [ þ t s   { Œ • © œI  ”  1 l x „  s \  K { © œ÷ &  H 6 ⁺ → 4 ⁺ → 2 ⁺ → 0 ⁺ _  „  s  ½ ¨› ¸ü <  ⠆ ¾ Ós  q 5 p w    H & h `  ¦ · ú ˜ à º e ”

 . 7 £ ¤ J ^π = 9 ⁻ , J ^π = 11 ⁻ , J ^π = 13 ⁻ ï  r 0 A[ þ t“ É r ¿ º-×  æ

$ í

  ν(d 3/2 h 11/2 ) C \ P s  y Œ •y Œ • 1-”  1 l x  , 2-”  1 l x  , 3-”   1

l

x  ü <   ½ + Ë÷ &# Q s À Ò# Q”   [ þ t> p u  © œI    H  כ `  ¦ · ú ˜ à º e ” 



.

Te Ù þ ˜[ þ t _  J ^π = 16 ⁺ ï  r 0 A  H Ä »Z > 
>  [ þ t> p u \  - t

 ± ú   : £ ¤Z > ô  Ç Å Ò3 l q`  ¦ ~ à ΍  H \  -t   © œI \  5 Å q ô  Ç



. : £ ¤ y  ^114−120 Te \  e ” # Q" f 16 ⁺ → 14 ⁺ „  s  \  - t

 14 ⁺ → 12 ⁺ „  s  \  -t \  q K  ‰ & ³$ y  ± ú “ ¦, π[(g _7/2 ) ² ] ₆

+

⊗ ν[(h 11/2 ) ² ] ₁₀

+

C \ P \  _ ô  Ç q | 9 é ß –$ í š ¸ E $

™t  + þ AI _  ½ ¨› ¸\  ¦ ° ú   H  כ Ü ¼– Ð · ú ˜ 94 R e ”   [3, 4]. Õ ª



Q
 ¹²² Te 1 l x 0 A" é ¶ ™ è Ò'   H s  ï  r 0 A_  \  -t  î ß –„  $ í s 



 t “ ¦ 15 ⁺ ï  r 0 A Õ ª % i ½ + É`  ¦ @ /’  ô  Ç . Õ ªa Ë > 5\  ¦  [ j y

 ˜ Ð . 7 £ ¤ ¹²⁶ Te  H Ó ü t : r ^124,122 Te Ù þ ˜Â Ò'   H J ^π = 15 ⁺ ï

 r 0 A B Ä º y © œô  Ç \  -t  î ß –„  $ í `  ¦ ˜ Ðs “ ¦ e ”  . Õ ªo 

“

¦ [ þ t> p u \  -t     oë ß –`  ¦ ˜ Ѐ   J ^π = 10 ⁺ , 15 ⁺ , 14 ⁺ ï  r 0

A[ þ t _   ⠆ ¾ Óõ  q 5 p w    H  כ `  ¦ · ú ˜ à º e ”  .   " f J ^π

= 15 ⁺ ï  r 0 A  H ν(h 11/2 ) ² C \ P _  [ þ t> p u õ  y © œ >    ½ + ˝ ) a



© œI e ” `  ¦ · ú ˜ à º e ”  . ‰ & ³F – Ð" f  H s  ï  r 0 A ¿ º € ª œ$ í   π(g 7/2 ) ² [ þ t> p u s  ¿ º×  æ$ í   ν(h ^11/2 ) ² C \ P \    ½ + ˝ ) a   õ 

“

 t   H S X ‰ z  ´ t  · ú § .  ë ß – h 11/2 C • ¸\  e ” # Q ×  æ$ í  à º

 N = 70    s  © œ“    â Ä º { 9  & h “   $ í | 9 ˜ Ð   H ½ ¨" í & h 

“

  $ í | 9 s  y © œ # Œ Ù þ ˜_  — ¸€ ª œ`  ¦ š ¸E $ ™t  + þ AI – Ð s ã ¼  H ì ø Í

€

 \  € ª œ$ í  _  g 7/2 C • ¸  H ! 3 q / B N + þ AI \  ¦ Ä »t    H $ í

| 9

\ " f š ¸  H { 9  -½ ¨" í  © œ  ñ Œ •6   x _    õ – Ð Æ Ò8 £ ¤ s   ) a  .

IV. + s Ç Â ] Ø

Ä

ºo   H Ù þ ˜ì ø Í6 £ x ¹²⁴ Sn ( ⁷ Li, p4n) ¹²⁶ Te `  ¦ : Ÿ x # Œ

126 Te _  [ þ t›  H  © œI [ þ t`  ¦ ë ß –[ þ t # Q y Œ ™ ‚   ì  rF  g † < Æ\  _ K  “ ¦ Û

¼— 2 ; ½ ¨› ¸\  ¦ › ¸  % i  . ‘ : r ƒ  ½ ¨\  ¦ : Ÿ x # Œ J ^π = 10 ⁺ ï  r 0

A_  ì ø Íy Œ ™l  8 £ ¤& ñ ÷ &% 3 Ü ¼ 9 s  © œ_  ´ ú §“ É r “ ¦Û ¼— 2 ;  © œI  [

þ

t s  % ƒ6 £ § Ü ¼– Ð µ 1 Ï| ÷ &% 3  . l ” > r \  · ú ˜ 9”    © œI [ þ t õ  † < Ê a

 D h– Ðs  µ 1 Ï|  ) a “ ¦Û ¼— 2 ;  © œI [ þ t _  $ í | 9 `  ¦ µ 1 ß) €? /l  0 A

# Œ s Ö  © Ù þ ˜“   Sn õ  Te 1 l x 0 A" é ¶ ™ è[ þ t \  @ /ô  Ç [ þ t> p u \  - t

 ^ ‰> $ í `  ¦ ì  r$ 3  % i  . J ^π = 10 ⁺ ï  r 0 A  H h 11/2 C • ¸_ 

¿

º-ï  r×  æ$ í  _  [ þ t> p u 7 £ ¤ ν(h 11/2 ) ² Ü ¼– Ð Ò q t$ í  ) a  כ e ” `  ¦ · ú ˜ Ã

º e ” % 3  . Û ¼— 2 ;-ì ø ̈́  $ í s  J ^π = 15 ⁺ ï  r 0 A  H ¹²² Te 1 l x 0 A

"

é

¶ ™ è Ò' _  J ^π = 10 ⁺ ^ ‰> $ í `  ¦ ^  ¦ M : ν[(h 11/2 ) ² ] ₁₀

+

[ þ t

>

p

u õ  y © œ >    ½ + Ë÷ &# Q e ”   H  כ Ü ¼– Ð Æ Ò8 £ ¤ ÷ &% 3  .

P

c p 8 ý ò k >

‘

: r  7 Hë  H _  z  ´+ « >“ É r   ñÅ Ò² D Gw n @ /† < Ɠ § Ù þ ˜Ó ü t o † < Æõ _  y Œ ™  Õ

ªÒ  ¨ õ _  / B N1 l x ƒ  ½ ¨– Ð s À Ò# Q & ’ 6 £ §.

Y

c p w Š à U Ø ”  ô

[1] R. Broda et al., Phys. Rev. Lett. 68, 1671 (1992).

[2] M. Grinberg, Ch. Protochristov, W. Andrejtscheff, G.

Lo Bianco and G. Falconi, Phys. Rev. C 61, 024317 (2000).

[3] E. S. Paul, D. B. Fossan, J. M. Sears and I.

Thorslund, Phys. Rev. C 52, 2984 (1995).

[4] C.-B. Moon and J. U. Kwon, J. Korean Phys. Soc.

32, 666 (1998).

[5] C.-B. Moon, Sae Mulli 59, 397 (2009).

[6] C. T. Zhang, P. Bhattacharyya, P. J. Daly, Z. W.

Grabowski, R. H. Mayer, M. Sferrazza, R. Broda, B. Fornal, W. Kr´ olas, T. Pawlat, D. Bazzacco, S.

Lunardi, C. Rossi Alvarez and G. de Angelis, Nucl.

Phys. A 628, 386 (1998).

[7] C.-B. Moon, Sae Mulli 56, 489 (2008).

[8] C.-B. Moon, Sae Mulli 58, 368 (2009).

[9] Kenneth S. Krane, Introductory Nuclear Physics

(John Wiley & Sons, New York, 1988), p. 141.