+ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria ++ Joint Institute for Nuclear Research, Dubna, Russia ON E0 TRANSITIONS BETWEEN 0 + STATES IN THE SAME NUCLEUS V. P. Garistov + O.K. Egorov A.A. Solnyshkin ++

Holstein Primakoff transformation

E=an+bn 2

0+0+

mishmash

ОБНАРУЖЕНИЕ ВОЗБУЖДЕННОГО 0 + -СОСТОЯНИЯ В ЯДРЕ 160 DY С ЭНЕРГИЕЙ КЭВ И.Адам, Д.Д.Богаченко, В.П.Гаристов, О.К.Егоров, Т.А.Исламов, В.В.Колесников, В.И.Силаев, А.А.Солнышкин

ЭНЕРГИЯ СОСТОЯНИЯ, МэВ ЧИСЛО БОЗОНОВ 0 + -СОСТОЯНИЯ 160 Dy Модель взаимодействующих бозонов

Григорьев: ΣI=0.031 ΣI=0.14 K I=0.020 K I=0.025 K681.3 I=0.046 K682.3 I=0.094

(n=4) (n=3) (n=8) (n=2) (n=1) (n=0) Dy

K I=0,096 K I=0,024 K K ΣI=0.12

I=0.53 I=1.40 I

X( (E0/E2) = N[17/An^(2/3) X(X0/E2) = An=160; r0=1.02*An^(1/3); be2=5.94*0.01*An^(4/3); ro=0.7/An^(1/3); ea=1.44; ea^2*r0^4*ro^2/be2 Митропольский И.А. (теор.) препринт ЛИЯФ, 1095, 1985 г. наша оценка (эксп.) X(X0/E2) > 0.66

Состояние 0 + при MeV соответствует первому (двойная система с α-кластером) возбуждению по координате массовой асимметрии. Вращательные полосы отрицательной четности соответствуют возбуждению угловых колебаний изгиба в α-кластерной двойной системе. Кластерная модель ядра

Григорьев: ΣI=0.031 ΣI=0.14 K I=0.021 K I=0.024 K681.3 I=0.052 K682.3 I=0.088

СПАСИБО ЗА ВНИМАНИЕ!

K I=0,027 K I=0,093 K K ΣI=0.12

Dy

7 K681.3

NEW EXCITED STATE WITH THE ENERGY OF KEV IN 160 DY NUCLEUS J.Adam 1, D.Bogachenko 2, V.P.Garistov 3, O.K.Egorov 2, T.A.Islamov 1, V.V.Kolesnikov 2, V.I.Silaev 2, A.A.Solnyshkin 1 1) Joint Institute for Nuclear Research, Dubna, Russia 2) Institute Theoretical and Experimental Physics, Moscow, Russia 3) Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria The theoretical calculations [1] predict existence of a 0 + state with energy ~700 keV in 160 Dy nucleus. For finding-out of existence of this 0 + state we measure β-spectrograms of [2] DLNP JINR for fractions Er (two photographic plates) and Ho (one photographic plate) using universal installation МАС-1 in ITEP [3]. At the analysis it was found out, that on all three photographic plates to the left of known line EIK with energy keV below by energy on 1 keV, the peak comparable by intensity with the specified line is confidently observed. Our attempts to carry the mentioned peak to a conversion line or to any of known from the literature [4] γ-transitions in 160 Dy nucleus have not crowned with success. Then we proposed, that this peak is probably caused by new transition with energy keV, unloading the corresponding new raised state with energy keV to the ground state. Except for the specified state, from experiment four more states with excitation energies , , and keV are known. Considering, that from these levels transitions to the entered by us keV level are possible, we have undertaken searches of such transitions. As a result one of such transitions with energy keV, between states and keV, has been found out. In spite of that this fact already is powerful enough argument in favour of existence of a state keV in a nucleus 160 Dy, searches of other transitions now proceed. 1. A.A.Solnyshkin, e.a. // Phys. Rev. C V.72. P Abdurazakov A.A. e.a. Beta-spectrographs with constant magnets, Tashkent, Uzbekistan, Egorov O.K. e.a. JTF V. 48, I.Adam e.a.// Izv. RAN, ser. Fiz V.66. P.1384 and C.W. Reich // Nuclear Data Sheets 105, 557 (2005).

(7) % (3) % (4) % (3) % (1) % (8) % γ γ 1177 γ I=0.07 γ γ 872 γ I=0.014

Название E *, кэВ Y c расч, мкм Y c апр, мкм E e апр, кэВ E апр, кэВ E, кэВ S лин, мкм 2 S / S н, см J эксп J*J* 1 K-1271,00 () 160 Dy , , , , ,218 9, ,290,011– 2 K-1271,89 () 160 Dy 1271, , , , , ,941 9, ,290,047 0,12 (2) н K-1431,66 (3) 160 Dy 1431, , , , , ,49 1,000 10, ,290,055 0,055 (12)

K681.3 I=0.032 K682.3 I=0.091 K I=0.018 K I=0.020 Григорьев: ΣI=0.031 ΣI=0.14