The BECQUEREL Project:The BECQUEREL Project: Progress Report for Years 2006-8 and Plans for 2009-11Progress Report for Years 2006-8 and Plans for 2009-11

D. A. Artemenkov, V. Bradnov, A. I. Malakhov, D. O. Krivenkov, P. A. D. A. Artemenkov, V. Bradnov, A. I. Malakhov, D. O. Krivenkov, P. A. Rukoyatkin, V. V. Rusakova, T. V. Shchedrina, Rukoyatkin, V. V. Rusakova, T. V. Shchedrina, P. I. ZarubinP. I. Zarubin, I.G Zarubina, I.G ZarubinaV. I. Veksler and A. M. Baldin Laboratory of High Energy Phyiscs,JINR, Dubna, RussiaV. I. Veksler and A. M. Baldin Laboratory of High Energy Phyiscs,JINR, Dubna, RussiaM. M. Chernyavsky, S. P. Kharlamov, S. G. Gerasimov, L. A. Goncharova, G. I. M. M. Chernyavsky, S. P. Kharlamov, S. G. Gerasimov, L. A. Goncharova, G. I. Orlova, N. G. Peresadko, N. G. PolukhinaOrlova, N. G. Peresadko, N. G. Polukhina P. N. Lebedev Physical Institute RAS, Moscow, RussiaP. N. Lebedev Physical Institute RAS, Moscow, RussiaММ. Haiduc, A. Neagu,. Haiduc, A. Neagu, E. StefanE. StefanInstitute of Space Sciences, Bucharest-Magurele, RomaniaInstitute of Space Sciences, Bucharest-Magurele, RomaniaA. A. Moiseenko, V. R. SarkisyanA. A. Moiseenko, V. R. SarkisyanErevan Physical Institute, Erevan, ArmeniaErevan Physical Institute, Erevan, ArmeniaR. StanoevaR. StanoevaInstitute for Nuclear Research and Nuclear Energy BAS, Sofia, BulgariaInstitute for Nuclear Research and Nuclear Energy BAS, Sofia, BulgariaS. VokalS. VokalSafarik University, Kosice, SlovakiaSafarik University, Kosice, Slovakia

The BECQUEREL Project (Beryllium (Boron) Clustering Quest in Relativistic Multifragmentation) at the JINR Nuclotron is devoted systematic exploration of clustering features of light stable and radioactive nuclei. A nuclear track emulsion is used to explore the fragmentation of the relativistic nuclei down to the most peripheral interactions - nuclear "white" stars. This technique provides a record spatial resolution and allows one to observe the 3D images of peripheral collisions. The analysis of the relativistic fragmentation of neutron-deficient isotopes has special advantages owing to a larger fraction of observable nucleons.

Nuclear beams of energy higher than 1A GeV are recognized as a novel opportunity for the nuclear structure explorations. Among all variety of the nuclear interactions the peripheral dissociation bears uniquely complete information about the excited nucleus states above particle decay thresholds.

Superposition of microphotographs of interaction of relativistic nucleus 32S and human hair taken with MBI-9 microscope and NIKON camera

Nuclear Track EmulsionsNuclear Track Emulsions

NUCLOTRON: NUCLOTRON: 2.1 А 2.1 А GeVGeV 1414NN

Tatjana Shchedrina

132 events 1.2A GeV 132 events 1.2A GeV 1414N → 3He + HN → 3He + H

50 “white” stars (2 events 6He+3He+4He+1H)

Nuclear Clustering Nuclear Clustering

Physics ProgramPhysics Program

COCO22 laser laser

Zpr/Apr = 4/9 10B → 9Be

.

370 events 1.2 A GeV370 events 1.2 A GeV 9 9BeBe→2He→2He

39 stars with heavy fragment of target nucleus (b-particle)

144 “white” stars +1.7 MeV

27 stars with target proton recoil (g-particle)

Denis Artemenkov

0+, 8Be(92 KeV, 6.8 eV)

2+, 8Be(2.9 MeV, 1. 5 MeV)

Suggested analysis: 2000 eventsSuggested analysis: 2000 events 99Be + p → 2Be + p → 2αα

Nadezhda Kornegrutsa

Zpr/Apr = 4/7 7Li → 7Be

1.6

MeV

5.6

6.9

25.3

21.2

Zpr/Apr = 5/8 10B → 8B

Nearer approach of the nuclei with an impact parameter Nearer approach of the nuclei with an impact parameter (a), absorption of quasireal photon by 8B nucleus (b), 8B (a), absorption of quasireal photon by 8B nucleus (b), 8B dissociation on fragment pair - p and 7Be (c).dissociation on fragment pair - p and 7Be (c).

Diagram of peripheral dissociation of relativistic 8B Diagram of peripheral dissociation of relativistic 8B nucleus in EM field of Ag nucleusnucleus in EM field of Ag nucleus

8В (1.2 A GeV) → 7Ве + p

Ralica Stanoeva

88BB →→ 2233He He ++ 22HH

Zpr/Apr = 2/3 12C → 9C

Major task: Major task: analysis ofanalysis of 99СС exposureexposure

Dmitry Krivenkov

Zpr/Apr = 5/12 12C → 12N

SuggestedSuggested 1100CC exposureexposure

10С

1.0 A 1.0 A ГэВГэВ 1010BB→→2233Не+Не+44НеНе

SuggestedSuggested 1111CC exposureexposure

2.0 A GeV 2.0 A GeV 1111B→B→44Не+Не+77BeBe

CONCLUDING REMARKSCONCLUDING REMARKSThe presented observations serve as an illustration of prospects of the Nuclotron for The presented observations serve as an illustration of prospects of the Nuclotron for nuclear physics and astrophysics researches. In spite of an extraordinarily large distinction nuclear physics and astrophysics researches. In spite of an extraordinarily large distinction from the nuclear excitation energy the relativistic scale does not impede investigations of from the nuclear excitation energy the relativistic scale does not impede investigations of nuclear interactions down to energy scale typical for nuclear astrophysics, but on the nuclear interactions down to energy scale typical for nuclear astrophysics, but on the contrary gives advantages. The major one of them is the possibility of principle of observing contrary gives advantages. The major one of them is the possibility of principle of observing

and investigating multi-particle systems.and investigating multi-particle systems. The investigations with light nuclei provide a basis for challenging studies of increasingly The investigations with light nuclei provide a basis for challenging studies of increasingly complicated systems complicated systems He – H - n He – H - n produced via multifragmentation of heavier relativistic produced via multifragmentation of heavier relativistic nuclei in the energy scale relevant for nuclear astrophysics. In this respect, the motivated nuclei in the energy scale relevant for nuclear astrophysics. In this respect, the motivated prospects are associated with a detailed analysis of the already observed fragment jets in prospects are associated with a detailed analysis of the already observed fragment jets in the events of EM&Diffractive dissociation of the events of EM&Diffractive dissociation of AuAu nuclei at nuclei at 10.6A 10.6A GeV and GeV and Pb Pb nuclei at nuclei at 160A160A GeV.GeV. Due to a record space resolution the emulsion technique provides unique entirety in Due to a record space resolution the emulsion technique provides unique entirety in studying of light nuclei, especially, neutron-deficient ones. Providing the 3D observation of studying of light nuclei, especially, neutron-deficient ones. Providing the 3D observation of narrow dissociation vertices this classical technique gives novel possibilities of moving narrow dissociation vertices this classical technique gives novel possibilities of moving toward more and more complicated nuclear systems. Therefore this technique deserves toward more and more complicated nuclear systems. Therefore this technique deserves upgrade, without changes in its detection basics, with the aim to speed up the microscope upgrade, without changes in its detection basics, with the aim to speed up the microscope scanning for rather rare events of peripheral dissociation.scanning for rather rare events of peripheral dissociation.

3.65A GeV 3.65A GeV 2828Si 2+2+2+2+2+2+1Si 2+2+2+2+2+2+1

NUCLOTRON: 1A GeV NUCLOTRON: 1A GeV 5656FeFe

Elena Stefan Alina-Tania Neagu

1 2 3

4 5 6

SPS: 158 A GeV/c PbSPS: 158 A GeV/c Pb

Наименование узлов и систем установки, ресурсов, источников финансирования

Стоимость узлов (тыс.долл.) установки.Потребности в ресурсах

Предложения лабораторий по распределению финансирования и ресурсов

1 г. 2 г. 3 г. 4 г. 5 г.

Основные узлы и оборудование 1.Датчики для микроскопов2.Электроника, ФЭУ

1.20 тыс. дол.2.60 тыс.долл.

35 тыс. долл.

25 тыс. долл.

20 тыс. долл.

Необходимые ресурсы

нормо

ОП ОИЯИ – механические работы

– электроника КБЛАБОРАТОРИЯ

ООЭП

1 чел. год1 чел. год

часУскоритель (Нуклотрон)РеакторЭВМ (тип)

100 100 100

Эксплуатационные расходы

Источники финансирования

бюджетЗатраты из бюджета, в том числе инвалюные средства

80 тыс. долл.35 тыс. долл.

25 тыс. долл.

20 тыс. долл.

внебюджетные

Вклады коллаборантов Средства по грантам Вклады спонсоров Средства по договорам Другие источники и т.д.

1. Фотоумножители (Hamamatsu, 1. Фотоумножители (Hamamatsu, Photonis)Photonis)

7700 00 EuroEuro 7 7 шт.шт. 50500000 Euro Euro

2. Зарядово-цифровой 2. Зарядово-цифровой преобразователь CAEN C1205 или преобразователь CAEN C1205 или аналогичныйаналогичный

4000 Euro4000 Euro 1 1 шт.шт. 4000 4000 EuroEuro

3. Материалы и радиоэлектронные 3. Материалы и радиоэлектронные комплектующие детекторов и комплектующие детекторов и приемной электроникиприемной электроники

2500 Euro2500 Euro 303000 Euro00 Euro

4. Осциллограф TDS3000B4. Осциллограф TDS3000B 8000 Euro8000 Euro 1 1 шт.шт. 8000 8000 EuroEuro

Итого: Итого: 20200000 Euro00 Euro

Запрос на приобретение Запрос на приобретение электронной аппаратуры формирования пучковэлектронной аппаратуры формирования пучков

на 2009-11 гг.на 2009-11 гг.

((77000 000 Euro Euro в год)в год)

8В (1.2A GeV) → 2Не + Н

Measured Charges of Secondary Fragments of 8В Nucei

Density of δ-electrons per 1 мм length of beam particles Zfr > 2.

88B: Total PB: Total PTT ( (77Be+p)Be+p)

EMD “white”starsEMD “white”stars

nnhh≠≠00