New results on the halo structure of B-8

Autor:	Smedberg, M. H., Baumann, T., Aumann, T., Axelsson, L., Bergmann, U., García Borge, María José, Cortina-Gil, D., Fraile, Luis M., Geissel, H., Grigorenko, L., Hellström, M., Ivanov, M., Iwasa, N., Janik, R., Jonson, B., Lenske, H., Markenroth, K., Münzenberg, G., Nilsson, T., Richter, Achim W., Riisager, K., Scheidenberger, C., Schrieder, G., Schwab, W., Simon, H., Sitar, B., Strmen, P., Sümmerer, K., Winkler, M., Zhukov, M. V.
Jazyk:	angličtina
Rok vydání:	1999
Předmět:	Breakup reactions 6 ≤ A ≤ 19 [[PACS] Properties of specific nuclei listed by mass ranges] One-proton removal cross section Nuclear structure Momentum distributions [PACS] Breakup and momentum distributions [PACS] Properties of specific nuclei listed by mass ranges: 6 ≤ A ≤ 19 Unstable nuclei
Zdroj:	Digital.CSIC. Repositorio Institucional del CSIC instname
Popis:	7 pages, 1 table, 3 figures.-- PACS nrs.: 25.60.Gc; 27.20.+n. The longitudinal momentum distribution of Be-7 fragments after fragmentation of B-8 and the one-proton removal cross section (σ(-1p)) in a carbon target were measured at 1440 MeV/u with the fragment separator FRS used as an energy-loss spectrometer. The results show a narrow momentum distribution with a FWHM value of 91 ± 5 MeV/c and a large cross-section, σ(-1p) = 98 ± 6 mb. Both these results support the interpretation of a spatially extended proton orbit forming a halo in the B-8 ground state. The momentum distribution and the: one-proton removal cross section are shown to be reproduced with a three-body wave function for B-8 where the target is treated as a black disc in the breakup process. This work was supported by the German Federal Minister for Education and Research BMBF under Contracts 06 DA 820, 06 OF 474, and 06 MZ 476 and by GSI via Hochschulzusammenarbeitsvereinbarungen under Contracts DARIK, OF ELK, and MZ KRK. It was partly supported by the Polish Committee of Scientific Research under Contract PB2/P03B/113/09, EC under Contract ERBCHGE-CT92-0003, CICYT under Contract AEN96-1679 (MJGB, LMF), and by Deutsche Forschungsgemeinschaft (DFG)under Contract 436 RUS 130/127/1 and Le-439/1. One of us (B.J.) acknowledges the support through an Alexander von Humboldt Research Award.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::a85fc2ced32e46dd9a15fb2eba8f9345 http://hdl.handle.net/10261/10015 Zobrazit plný text záznamu